mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-08 10:41:25 +02:00
f3f6f8a8be
Changed Fragment links to Anchor links, however it's is slighty confusing what the right name for the thing is. According to w3.org: "Some URIs refer to a location within a resource. This kind of URI ends with "#" followed by an anchor identifier (called the fragment identifier)." - http://www.w3.org/TR/html401/intro/intro.html#fragment-uri After doing some research in the most common used name for the #some-link identifier I came to the conclusion that most of the time (about 70% on StackOverflow/BlogArticles/Interwebz) Anchor-link was the term used to describe the identifier. Imho, Anchor is the prefered term for the identifier. Is it acceptable to change fragment to anchor, since it seems more used?
722 lines
24 KiB
Markdown
722 lines
24 KiB
Markdown
# Templates
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## Introduction
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SilverStripe templates consist of HTML code augmented with special control codes, described below. Because of this, you
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can have as much control of your site's HTML code as you like.
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Because the SilverStripe templating language is a string processing language it can therefore be used to make other
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text-based data formats, such as XML or RTF.
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Here is a very simple template:
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:::ss
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<html>
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<head>
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<% base_tag %>
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<title>$Title</title>
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<% require themedCSS("screen") %>
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</head>
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<body>
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<header>
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<h1>Bob's Chicken Shack</h1>
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</header>
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<% with $CurrentMember %>
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<p>Welcome $FirstName $Surname.</p>
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<% end_with %>
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<% if $Dishes %>
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<ul>
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<% loop $Dishes %>
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<li>$Title ($Price.Nice)</li>
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<% end_loop %>
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</ul>
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<% end_if %>
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<% include Footer %>
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</body>
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</html>
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More sophisticated use of templates for pages managed in the CMS,
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including template inheritance and navigation loops
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is documented in the [page types](/topics/page-types) topic.
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# Template elements
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## Variables
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Variables are things you can use in a template that grab data from the page and put in the HTML document. For example:
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:::ss
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$Title
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This inserts the value of the Title field of the page being displayed in place of `$Title`. This type of variable is called a **property**. It is often something that can be edited in the CMS. Variables can be chained together, and include arguments.
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:::ss
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$Property
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$Property(param)
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$Property.SubProperty
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These **variables** will call a method/field on the object and insert the returned value as a string into the template.
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* `$Property` will call `$obj->Property()` (or the field `$obj->Property`)
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* `$Property(param)` will call `$obj->Property("param")`
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* `$Property.SubProperty` will call `$obj->Property()->SubProperty()` (or field equivalents)
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If a variable returns a string, that string will be inserted into the template. If the variable returns an object, then
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the system will attempt to render the object through its forTemplate() method. If the `forTemplate()` method has not been
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defined, the system will return an error.
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SilverStripe provides many additional properties on the `SiteTree` class,
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see [Page Type Templates](/topics/page-type-templates) for details.
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### Escaping
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Sometimes you will have template tags which need to roll into one another. This can often result in SilverStripe looking
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for a "FooBar" value rather than a "Foo" and then "Bar" value or when you have a string directly before or after the
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variable you will need to escape the specific variable. In the following example `$Foo` is `3`.
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:::ss
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$Foopx // returns "" (as it looks for a Foopx value)
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{$Foo}px // returns "3px" (CORRECT)
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Or when having a `$` sign in front of the variable
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:::ss
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$$Foo // returns ""
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${$Foo} // returns "$3"
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You can also use a backslash to escape the name of the variable, such as:
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:::ss
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$Foo // returns "3"
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\$Foo // returns "$Foo"
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## Includes
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Within SilverStripe templates we have the ability to include other templates from the Includes directory using the SS
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'include' tag. For example, the following code would include the `Includes/SideBar.ss` code:
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:::ss
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<% include SideBar %>
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The "include" tag can be particularly helpful for nested functionality. In this example, the include only happens if
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a variable is true
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:::ss
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<% if $CurrentMember %>
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<% include MembersOnlyInclude %>
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<% end_if %>
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Includes can't directly access the parent scope of the scope active when the include is included. However you can
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pass arguments to the include, which are available on the scope top within the include
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:::ss
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<% with $CurrentMember %>
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<% include MemberDetails PageTitle=$Top.Title, PageID=$Top.ID %>
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<% end_with %>
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You can also perform includes using the Requirements Class via the template controls. See the section on
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[Includes in Templates](requirements#including_inside_template_files) for more details and examples.
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:::ss
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<% require themedCSS("LeftNavMenu") %>
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### Including CSS and JavaScript files (a.k.a "Requirements")
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See [CSS](/topics/css) and [Javascript](/topics/javascript) topics for individual including of files and
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[requirements](reference/requirements) for good examples of including both Javascript and CSS files.
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## Conditional Logic
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You can conditionally include markup in the output. That is, test for something
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that is true or false, and based on that test, control what gets output.
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The simplest if block is to check for the presence of a value.
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:::ss
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<% if $CurrentMember %>
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<p>You are logged in as $CurrentMember.FirstName $CurrentMember.Surname.</p>
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<% end_if %>
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The following compares a page property called `MyDinner` with the value in
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quotes, `kipper`, which is a **literal**. If true, the text inside the if-block
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is output.
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:::ss
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<% if $MyDinner=="kipper" %>
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Yummy, kipper for tea.
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<% end_if %>
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Note that inside a tag like this, variables should have a '$' prefix, and
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literals should have quotes. SilverStripe 2.4 didn't include the quotes or $
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prefix, and while this still works, we recommend the new syntax as it is less
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ambiguous.
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This example shows the use of the `else` option. The markup after `else` is
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output if the tested condition is *not* true.
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:::ss
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<% if $MyDinner=="kipper" %>
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Yummy, kipper for tea
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<% else %>
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I wish I could have kipper :-(
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<% end_if %>
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This example shows the user of `else_if`. There can be any number of `else_if`
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clauses. The conditions are tested from first to last, until one of them is true,
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and the markup for that condition is used. If none of the conditions are true,
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the markup in the `else` clause is used, if that clause is present.
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:::ss
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<% if $MyDinner=="quiche" %>
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Real men don't eat quiche
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<% else_if $MyDinner==$YourDinner %>
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We both have good taste
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<% else %>
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Can I have some of your chips?
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<% end_if %>
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This example shows the use of `not` to negate the test.
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:::ss
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<% if not $DinnerInOven %>
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I'm going out for dinner tonight.
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<% end_if %>
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You can combine two or more conditions with `||` ("or"). The markup is used if
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*either* of the conditions is true.
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:::ss
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<% if $MyDinner=="kipper" || $MyDinner=="salmon" %>
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yummy, fish for tea
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<% end_if %>
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You can combine two or more conditions with `&&` ("and"). The markup is used if
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*both* of the conditions are true.
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:::ss
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<% if $MyDinner=="quiche" && $YourDinner=="kipper" %>
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Lets swap dinners
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<% end_if %>
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You can use inequalities like `<`, `<=`, `>`, `>=` to compare numbers.
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:::ss
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<% if $Number>="5" && $Number<="10" %>
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Number between 5 and 10
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<% end_if %>
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## Looping Over Lists
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The `<% loop %>...<% end_loop %>` tag is used to **iterate** or loop over a
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collection of items. For example:
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:::ss
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<ul>
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<% loop $Children %>
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<li>$Title</li>
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<% end_loop %>
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</ul>
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This loops over the children of a page, and generates an unordered list showing
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the `Title` property from each one. Note that `$Title` *inside* the loop refers
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to the `Title` property on each object that is looped over, not the current page.
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This is know as the `Scope` of the template. For more information about `Scope`
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see the section below.
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To refer to the current page's `Title` property inside the loop, you can do
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`$Up.Title`. More about `Up` later.
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`$Me` can be used to refer to the current object context the template is rendered
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with.
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### Position Indicators
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Inside the loop scope, there are many variables at your disposal to determine the
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current position in the list and iteration:
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* `$Even`, `$Odd`: Returns boolean, handy for zebra striping
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* `$EvenOdd`: Returns a string, either 'even' or 'odd'. Useful for CSS classes.
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* `$First`, `$Last`, `$Middle`: Booleans about the position in the list
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* `$FirstLast`: Returns a string, "first", "last", or "". Useful for CSS classes.
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* `$Pos`: The current position in the list (integer). Will start at 1.
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* `$TotalItems`: Number of items in the list (integer)
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### Altering the list
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`<% loop %>` statements iterate over a `[api:DataList]` instance. As the
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template has access to the list object, templates can call `[api:DataList]`
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functions. For instance, see the following examples:
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Providing a custom sort.
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:::ss
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<ul>
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<% loop $Children.Sort(Title) %>
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<li>$Title</li>
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<% end_loop %>
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</ul>
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Limiting the number of items displayed.
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:::ss
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<ul>
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<% loop $Children.Limit(10) %>
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<li>$Title</li>
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<% end_loop %>
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</ul>
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Reversing the loop.
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:::ss
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<ul>
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<% loop $Children.Reverse %>
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<li>$Title</li>
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<% end_loop %>
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</ul>
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The `DataList` class also supports chaining methods. For example, to reverse
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the list and output the last 3 items we would write:
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:::ss
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<ul>
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<% loop $Children.Reverse.Limit(3) %>
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<li>$Title</li>
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<% end_loop %>
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</ul>
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### Modulus and MultipleOf
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$Modulus and $MultipleOf can help to build column layouts.
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:::ss
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$Modulus(value, offset) // returns an int
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$MultipleOf(factor, offset) // returns a boolean.
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The following example demonstrates how you can use $Modulus(4) to generate
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custom column names based on your loop statement. Note that this works for any
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control statement (not just children).
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:::ss
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<% loop $Children %>
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<div class="column-{$Modulus(4)}">
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...
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</div>
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<% end_loop %>
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Will return you column-3, column-2, column-1, column-0, column-3 etc. You can
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use these as styling hooks to float, position as you need.
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You can also use $MultipleOf(value, offset) to help build columned layouts. In
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this case we want to add a <br> after every 3th item.
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:::ss
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<% loop $Children %>
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<% if $MultipleOf(3) %>
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<br>
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<% end_if %>
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<% end_loop %>
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## Scope
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In the `<% loop %>` section, we saw an example of two **scopes**. Outside the
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`<% loop %>...<% end_loop %>`, we were in the scope of the page. But inside the
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loop, we were in the scope of an item in the list. The scope determines where
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the value comes from when you refer to a variable. Typically the outer scope of
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a page type's layout template is the page that is currently being rendered.
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The outer scope of an included template is the scope that it was included into.
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### Up
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When we are in a scope, we sometimes want to refer to the scope outside the
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<% loop %> or <% with %>. We can do that easily by using `$Up`. `$Up` takes
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the scope back to the previous level. Take the following example:
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:::ss
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$Title
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--
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<% loop $Children %>
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$Title
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$Up.Title
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--
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<% loop $Children %>
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$Title
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$Up.Title
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<% end_loop %>
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<% end_loop %>
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With a page structure (Blog -> Blog entry -> Child blog entry) the
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above will produce:
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:::ss
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Blog
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--
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Blog entry
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Blog
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--
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Child blog entry
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Blog entry
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### Top
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While `$Up` provides us a way to go up 1 scope, `$Top` is a shortcut to jump to
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the top most scope of the page. Using the previous example but expanded to
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include `$Top`:
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:::ss
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$Title
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--
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<% loop $Children %>
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$Title
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$Up.Title
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$Top.Title
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--
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<% loop $Children %>
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$Title
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$Up.Title
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$Top.Title
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<% end_loop %>
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<% end_loop %>
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Will produce
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:::ss
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Blog
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--
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Blog entry
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Blog
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Blog
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--
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Child blog entry
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Blog entry
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Blog
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### With
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The `<% with %>...<% end_with %>` tag lets you introduce a new scope. Consider
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the following example:
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:::ss
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<% with $CurrentMember %>
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Hello $FirstName, welcome back. Your current balance is $Balance.
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<% end_with %>
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Outside the `<% with %>...<% end_with %>`, we are in the page scope. Inside it,
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we are in the scope of `$CurrentMember`. We can refer directly to properties and
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methods of that member. So $FirstName is equivalent to $CurrentMember.FirstName.
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This keeps the markup clean, and if the scope is a complicated expression we don't
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have to repeat it on each reference of a property.
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`<% with %>` also lets us use a collection as a scope, so we can access
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properties of the collection itself, instead of iterating over it. For example:
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:::ss
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$Children.Count
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returns the number of items in the $Children collection.
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## Pagination
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Lists can be paginated, and looped over to generate pagination. For this to
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work, the list needs to be wrapped in a `[api:PaginatedList]`. The process is
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explained in detail on the ["pagination" howto](/howto/pagination).
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The list is split up in multiple "pages", each . Note that "page" is this context
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does not necessarily refer to a `Page` class (although it often happens to be one).
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* `$MoreThanOnePage`: Returns true when we have a multi-page list, restricted with a limit.
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* `$NextLink`, `$PrevLink`: This returns links to the next and previous page in a multi-page datafeed. They will return blank if there's no appropriate page to go to, so `$PrevLink` will return blank when you're on the first page.
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* `$CurrentPage`: Current page iterated on
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* `$TotalPages`: Total number of pages
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* `$TotalItems`: This returns the total number of items across all pages.
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* `$Pages`: The actual (limited) list of records, use in an inner loop
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* `$PageNum`: Page number, starting at 1 (within `$Pages`)
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* `$Link`: Links to the current controller URL, setting this page as current via a GET parameter (within `$Pages`)
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* `$CurrentBool`: Returns true if you're currently on that page (within `$Pages`)
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## Formatting and Casting
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Properties are usually auto-escaped in templates to ensure consistent representation,
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and avoid format clashes like displaying unescaped ampersands in HTML.
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By default, values are escaped as `XML`, which is equivalent to `HTML` for this purpose.
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There's some exceptions to this rule, see the ["security" topic](/topics/security).
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In case you want to explicitly allow unescaped HTML input,
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the property can be cast as `[api:HTMLText]`.
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The following example takes the `Content` field in a `SiteTree` class,
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which is of this type. It forces the content into an explicitly escaped format.
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:::ss
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$Content.XML // transforms e.g. "<em>alert</em>" to "<em>alert</em>"
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Apart from value formatting, there's many methods to transform them as well,
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For example, the built in `$Now` placeholder is an instance of `[api:Date]`,
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and returns the current date in a standard system format.
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Since its an object, you can use the helper methods to return other formats:
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:::ss
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$Now.Year // Current year
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$Now.Nice // Localized date, based on i18n::get_locale()
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See [data-types](/topics/data-types) for more information.
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## Translations
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Translations are easy to use with a template, and give access to SilverStripe's translation facilities. Here is an example:
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<%t Member.WELCOME 'Welcome {name} to {site}' name=$Member.Name site="Foobar.com" %>
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Pulling apart this example we see:
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* `Member.WELCOME` is an identifier in the translation system, for which different translations may be available. This string may include named placeholders, in braces.
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* `'Welcome {name} to {site}'` is the default string used, if there is no translation for Member.WELCOME in the current locale. This contains named placeholders.
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* `name=$Member.Name` assigns a value to the named placeholder `name`. This value is substituted into the translation string wherever `{name}` appears in that string. In this case, it is assigning a value from a property `Member.Name`
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* `site="Foobar.com"` assigns a literal value to another named placeholder, `site`.
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## Comments
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Using standard HTML comments is supported. These comments will be included in the published site.
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:::ss
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$EditForm <!-- Some public comment about the form -->
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However you can also use special SilverStripe comments which will be stripped out of the published site. This is useful
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for adding notes for other developers but for things you don't want published in the public html.
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:::ss
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$EditForm <%-- Some hidden comment about the form --%>
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## Partial Caching
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Partial caching lets you define blocks of your template that are cached for better performance. See [Partial Caching](/reference/partial-caching) for more information.
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### Base Tag
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The `<% base_tag %>` placeholder is replaced with the HTML base element. Relative links within a document (such as `<img
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src="someimage.jpg" />`) will become relative to the URI specified in the base tag. This ensures the browser knows where
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to locate your site’s images and css files. So it is a must for templates!
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It renders in the template as `<base href="http://www.mydomain.com" /><!--[if lte IE 6]></base><![endif]-->`
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## CurrentMember
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Returns the currently logged in member, if there is one.
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All of their details or any special Member page controls can be called on this.
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Alternately, you can use `<% if $CurrentMember %>` to detect whether someone has logged
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in.
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||
|
||
:::ss
|
||
<% if $CurrentMember %>
|
||
Welcome Back, $CurrentMember.FirstName
|
||
<% end_if %>
|
||
|
||
## Custom Template Variables and Controls
|
||
|
||
There are two ways you can extend the template variables you have available. You can create a new database field in your
|
||
`$db` or if you do not need the variable to be editable in the cms you can create a function which returns a value in your
|
||
`Page.php` class.
|
||
|
||
:::php
|
||
// mysite/code/Page.php
|
||
public function MyCustomValue() {
|
||
return "Hi, this is my site";
|
||
}
|
||
|
||
Will give you the ability to call `$MyCustomValue` from anywhere in your template.
|
||
|
||
:::ss
|
||
I've got one thing to say to you: <i>$MyCustomValue</i>
|
||
// output "I've got one thing to say to you: <i>Hi, this is my site</i>"
|
||
|
||
Your function could return a single value as above or it could be a subclass of `[api:ArrayData]` for example a
|
||
`[api:DataObject]` with many values then each of these could be accessible via a control loop
|
||
|
||
:::php
|
||
// ...
|
||
public function MyCustomValues() {
|
||
return new ArrayData(array("Hi" => "Kia Ora", "Name" => "John Smith"));
|
||
}
|
||
|
||
|
||
And now you could call these values by using
|
||
|
||
:::ss
|
||
<% with $MyCustomValues %>
|
||
$Hi , $Name
|
||
<% end_with %>
|
||
// output "Kia Ora , John Smith"
|
||
|
||
Or by using the dot notation you would have
|
||
|
||
:::ss
|
||
$MyCustomValues.Hi , $MyCustomValues.Name
|
||
// output "Kia Ora , John Smith"
|
||
|
||
### Side effects
|
||
|
||
All functions that provide data to templates must have no side effects, as the value is cached after first access. For example, this controller method
|
||
|
||
:::php
|
||
private $counter = 0;
|
||
|
||
public function Counter() {
|
||
$this->counter += 1;
|
||
return $this->counter;
|
||
}
|
||
|
||
|
||
and this template
|
||
|
||
:::ss
|
||
$Counter, $Counter, $Counter
|
||
|
||
|
||
will render as "1, 1, 1", not "1, 2, 3"
|
||
|
||
## .typography style
|
||
|
||
By default, SilverStripe includes the `theme/css/typography.css` file into the Content area. So you should always include the
|
||
typography style around the main body of the site so both styles appear in the CMS and on the template. Where the main body of
|
||
the site is can vary, but usually it is included in the /Layout files. These files are included into the main Page.ss template
|
||
by using the `$Layout` variable so it makes sense to add the .typography style around $Layout.
|
||
|
||
:::ss
|
||
<div class="typography">
|
||
$Layout
|
||
</div>
|
||
|
||
## Calling templates from PHP code
|
||
|
||
This is all very well and good, but how do the templates actually get called?
|
||
|
||
Templates do nothing on their own. Rather, they are used to render *a particular object*. All of the `<% if %>`, `<%control %>`,
|
||
and variable codes are methods or parameters that are called *on that object*. All that is necessary is
|
||
that the object is an instance of `[api:ViewableData]` (or one of its subclasses).
|
||
|
||
The key is `[api:ViewableData::renderWith()]`. This method is passed a For example, within the controller's default action,
|
||
there is an instruction of the following sort:
|
||
|
||
:::php
|
||
$controller->renderWith("TemplateName");
|
||
|
||
|
||
Here's what this line does:
|
||
|
||
* First `renderWith()` constructs a new object: `$template = new SSViewer("TemplateName");`
|
||
* `[api:SSViewer]` will take the content of `TemplateName.ss`, and turn it into PHP code.
|
||
* Then `renderWith()` passes the controller to `$template->process($controller);`
|
||
* `SSViewer::process()` will execute the PHP code generated from `TemplateName.ss` and return the results.
|
||
|
||
`renderWith()` returns a string - the populated template. In essence, it uses a template to cast an object to a string.
|
||
|
||
`renderWith()` can also be passed an array of template names. If this is done, then `renderWith()` will use the first
|
||
available template name.
|
||
|
||
Below is an example of how to implement renderWith. In the example below the page is rendered using the myAjaxTemplate
|
||
if the page is called by an ajax function (using `[api:Director::is_ajax()]`). Note that the index function is called by
|
||
default if it exists and there is no action in the url parameters.
|
||
|
||
:::php
|
||
class MyPage_Controller extends Page_Controller {
|
||
|
||
private static $allowed_actions = array('index');
|
||
|
||
public function init(){
|
||
parent::init();
|
||
}
|
||
|
||
public function index() {
|
||
if(Director::is_ajax()) {
|
||
return $this->renderWith("myAjaxTemplate");
|
||
} else {
|
||
return Array();// execution as usual in this case...
|
||
}
|
||
}
|
||
}
|
||
|
||
## Anchor Link rewriting
|
||
|
||
Anchor links are links with a "#" in them. A frequent use-case is to use anchor links to point to different
|
||
sections of the current page. For example, we might have this in our template.
|
||
|
||
For, example, we might have this on http://www.example.com/my-long-page/
|
||
|
||
:::ss
|
||
<ul>
|
||
<li><a href="#section1">Section 1</a></li>
|
||
<li><a href="#section2">Section 2</a></li>
|
||
</ul>
|
||
|
||
|
||
So far, so obvious. However, things get tricky because of we have set our `<base>` tag to point to the root of your
|
||
site. So, when you click the first link you will be sent to http://www.example.com/#section1 instead of
|
||
http://www.example.com/my-long-page/#section1
|
||
|
||
In order to prevent this situation, the SSViewer template renderer will automatically rewrite any anchor link that
|
||
doesn't specify a URL before the anchor, prefixing the URL of the current page. For our example above, the following
|
||
would be created:
|
||
|
||
:::ss
|
||
<ul>
|
||
<li><a href="my-long-page/#section1">Section 1</a></li>
|
||
<li><a href="my-long-page/#section2">Section 2</a></li>
|
||
</ul>
|
||
|
||
|
||
There are cases where this can be unhelpful. HTML anchors created from Ajax responses are the most common. In these
|
||
situations, you can disable anchor link rewriting by setting the
|
||
`SSViewer.rewrite_hash_links` configuration value to `false`.
|
||
|
||
### More Advanced Controls
|
||
|
||
Template variables and controls are just PHP properties and methods
|
||
on the underlying controllers and model classes.
|
||
We've just shown you the most common once, in practice
|
||
you can use any public API on those classes, and [extend](/reference/dataextension) them
|
||
with your own. To get an overview on what's available to you,
|
||
we recommend that you dive into the API docs for the following classes:
|
||
|
||
* `[api:Controller]`: Generic controller class
|
||
* `[api:DataObject]`: Generic model class
|
||
* `[api:ViewableData]`: Underlying object class for pretty much anything displayable
|
||
|
||
## Designing reusable templates
|
||
|
||
Although SilverStripe is ultimately flexible in how you create your templates, there's a couple of best practices. These
|
||
will help you to design templates for modules, and make it easier for other site developers to integrate them into their
|
||
own base templates.
|
||
|
||
* Most of your templates should be `Layout` templates
|
||
* Build your templates as a [Theme](/topics/themes) so you can easily re-use and exchange them
|
||
* Your layout template should include a standard markup structure (`<div id="Layout">$Layout</div>`)
|
||
* Layout templates only include content that could be completely replaced by another module (e.g. a forum thread). It
|
||
might be infeasible to do this 100%, but remember that every piece of navigation that needs to appear inside `$Layout`
|
||
will mean that you have to customise templates when integrating the module.
|
||
* Any CSS applied to layout templates should be flexible width. This means the surrounding root template can set its
|
||
width independently.
|
||
* Don't include any navigation elements in your `Layout` templates, they should be contained in the root template.
|
||
* Break down your templates into groups of includes. Site integrators would then have the power to override individual
|
||
includes, rather than entire templates.
|
||
|
||
For more information about templates go to the [Advanced Templates](/reference/advanced-templates) page.
|
||
|
||
## Related
|
||
|
||
* [Built in page controls](/reference/built-in-page-controls)
|
||
* [Page Type Templates](/topics/page-type-templates)
|
||
* [Typography](/reference/typography)
|
||
* [Themes](/topics/themes)
|
||
* [Widgets](/topics/widgets)
|
||
* [Images](/reference/image)
|
||
* [Tutorial 1: Building a basic site](/tutorials/1-building-a-basic-site)
|
||
* [Tutorial 2: Extending a basic site](/tutorials/2-extending-a-basic-site)
|
||
* [Developing Themes](/topics/theme-development)
|
||
* [Templates: formal syntax description](/reference/templates-formal-syntax)
|