Grid Field Extensions
=====================

Add Existing Search
-------------------

The `GridFieldAddExistingSearchButton` component provides a more complete solution for adding
existing records than a basic autocomplete. It uses the search context constructed by the model
class to provide the search form.

```php
$grid->getConfig()->addComponent(new GridFieldAddExistingSearchButton()));
```

Inline Editing
--------------

This example replaces the default data columns component with an inline editable one, and the
default add new button with one that adds new records inline.

```php
$grid = new GridField(
	'ExampleGrid',
	'Example Grid',
	$this->Items(),
		GridFieldConfig_RecordEditor::create()
			->removeComponentsByType('GridFieldAddNewButton')
			->removeComponentsByType('GridFieldDataColumns')
			->addComponent(new GridFieldEditableColumns(), 'GridFieldEditButton')
			->addComponent(new GridFieldAddNewInlineButton())
);
```

You can customise the form fields that are used in the grid by calling `setDisplayFields` on the
inline editing component. By default field scaffolding will be used.

```php
$grid->getConfig()->getComponentsByType('GridFieldEditableColumns')->setDisplayFields(array(
	'FirstField'  => function($record, $column, $grid) {
		return new TextField($column);
	},
	'SecondField' => array(
		'title' => 'Custom Title',
		'field' => 'ReadonlyField'
	)
));
```

Editing data contained in `many_many_extraFields` is supported - just treat it as you would any
other field.

Multi Class Adding
------------------

The `GridFieldAddNewMultiClass` allows the user to select the record type to create when creating
a new record. By default it allows them to select the model class for the grid field, or any
subclasses. You can control the createable classes using the `setClasses` method.

```php
$grid->getConfig()
     ->removeComponentsByType('GridFieldAddNewButton')
     ->addComponent(new GridFieldAddNewMultiClass());
```

Orderable Rows
--------------

The `GridFieldOrderableRows` component allows drag-and-drop reordering of any list type. The field
used to store the sort is set by passing a constructor parameter to the component, or calling
`setSortField`. For `many_many` relationships, the sort field should normally be an extra field on
the relationship.

```php
// Basic usage, defaults to "Sort" for the sort field.
$grid->getConfig()->addComponent(new GridFieldOrderableRows());

// Specifying the sort field.
$grid->getConfig()->addComponent(new GridFieldOrderableRows('SortField'));
```