silverstripe-userforms/code/Model/EditableCustomRule.php

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<?php
namespace SilverStripe\UserForms\Model;
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use InvalidArgumentException;
use LogicException;
use SilverStripe\CMS\Controllers\CMSMain;
use SilverStripe\Control\Controller;
use SilverStripe\Core\Convert;
use SilverStripe\ORM\DataObject;
use SilverStripe\Security\Member;
use SilverStripe\Versioned\Versioned;
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/**
* A custom rule for showing / hiding an EditableFormField
* based the value of another EditableFormField.
*
* @property string $ConditionOption
* @property int $ConditionFieldID
* @property string $Display
* @property string $FieldValue
* @property int $ParentID
* @method EditableFormField Parent()
* @method EditableFormField ConditionField()
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*/
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class EditableCustomRule extends DataObject
{
private static $condition_options = [
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'IsBlank' => 'Is blank',
'IsNotBlank' => 'Is not blank',
'HasValue' => 'Equals',
'ValueNot' => 'Doesn\'t equal',
'ValueLessThan' => 'Less than',
'ValueLessThanEqual' => 'Less than or equal',
'ValueGreaterThan' => 'Greater than',
'ValueGreaterThanEqual' => 'Greater than or equal'
];
private static $db = [
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'Display' => 'Enum("Show,Hide")',
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'ConditionOption' => 'Enum("IsBlank,IsNotBlank,HasValue,ValueNot,ValueLessThan,ValueLessThanEqual,ValueGreaterThan,ValueGreaterThanEqual")',
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'FieldValue' => 'Varchar(255)'
];
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private static $has_one = [
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'Parent' => EditableFormField::class,
'ConditionField' => EditableFormField::class
];
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/**
* Built in extensions required
*
* @config
* @var array
*/
private static $extensions = [
Versioned::class . "('Stage', 'Live')"
];
private static $table_name = 'EditableCustomRule';
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/**
* @param Member $member
* @return bool
*/
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public function canDelete($member = null)
{
return $this->canEdit($member);
}
/**
* @param Member $member
* @return bool
*/
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public function canEdit($member = null)
{
return $this->Parent()->canEdit($member);
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}
/**
* @param Member $member
* @return bool
*/
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public function canView($member = null)
{
return $this->Parent()->canView($member);
}
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/**
* Return whether a user can create an object of this type
*
* @param Member $member
* @param array $context Virtual parameter to allow context to be passed in to check
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* @return bool
*/
public function canCreate($member = null, $context = [])
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{
// Check parent page
$parent = $this->getCanCreateContext(func_get_args());
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if ($parent) {
return $parent->canEdit($member);
}
// Fall back to secure admin permissions
return parent::canCreate($member);
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}
/**
* Helper method to check the parent for this object
*
* @param array $args List of arguments passed to canCreate
* @return DataObject Some parent dataobject to inherit permissions from
*/
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protected function getCanCreateContext($args)
{
// Inspect second parameter to canCreate for a 'Parent' context
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if (isset($args[1]['Parent'])) {
return $args[1]['Parent'];
}
// Hack in currently edited page if context is missing
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if (Controller::has_curr() && Controller::curr() instanceof CMSMain) {
return Controller::curr()->currentPage();
}
// No page being edited
return null;
}
/**
* @param Member $member
* @return bool
*/
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public function canPublish($member = null)
{
return $this->canEdit($member);
}
/**
* @param Member $member
* @return bool
*/
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public function canUnpublish($member = null)
{
return $this->canDelete($member);
}
/**
* Substitutes configured rule logic with it's JS equivalents and returns them as array elements
*
* @return array
* @throws LogicException If the provided condition option was not able to be handled
*/
public function buildExpression()
{
/** @var EditableFormField $formFieldWatch */
$formFieldWatch = $this->ConditionField();
//Encapsulated the action to the object
$action = $formFieldWatch->getJsEventHandler();
// is this field a special option field
$checkboxField = $formFieldWatch->isCheckBoxField();
$radioField = $formFieldWatch->isRadioField();
$target = sprintf('$("%s")', $formFieldWatch->getSelectorFieldOnly());
$fieldValue = Convert::raw2js($this->FieldValue);
$conditionOptions = [
'ValueLessThan' => '<',
'ValueLessThanEqual' => '<=',
'ValueGreaterThan' => '>',
'ValueGreaterThanEqual' => '>='
];
// and what should we evaluate
switch ($this->ConditionOption) {
case 'IsNotBlank':
case 'IsBlank':
$expression = ($checkboxField || $radioField) ? "!{$target}.is(\":checked\")" : "{$target}.val() == ''";
if ((string) $this->ConditionOption === 'IsNotBlank') {
//Negate
$expression = "!({$expression})";
}
break;
case 'HasValue':
case 'ValueNot':
if ($checkboxField) {
if ($formFieldWatch->isCheckBoxGroupField()) {
$expression = sprintf(
"$.inArray('%s', %s.filter(':checked').map(function(){ return $(this).val();}).get()) > -1",
$fieldValue,
$target
);
} else {
$expression = "{$target}.prop('checked')";
}
} elseif ($radioField) {
// We cannot simply get the value of the radio group, we need to find the checked option first.
$expression = sprintf(
'%s.closest(".field, .control-group").find("input:checked").val() == "%s"',
$target,
$fieldValue
);
} else {
$expression = sprintf('%s.val() == "%s"', $target, $fieldValue);
}
if ((string) $this->ConditionOption === 'ValueNot') {
//Negate
$expression = "!({$expression})";
}
break;
case 'ValueLessThan':
case 'ValueLessThanEqual':
case 'ValueGreaterThan':
case 'ValueGreaterThanEqual':
$expression = sprintf(
'%s.val() %s parseFloat("%s")',
$target,
$conditionOptions[$this->ConditionOption],
$fieldValue
);
break;
default:
throw new LogicException("Unhandled rule {$this->ConditionOption}");
break;
}
$result = [
'operation' => $expression,
'event' => $action,
];
return $result;
}
/**
* Determines whether the rule is satisfied, based on provided form data.
* Used for php validation of required conditional fields
*
* @param array $data Submitted form data
* @return boolean
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* @throws LogicException Invalid ConditionOption is set for this rule.
*/
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public function validateAgainstFormData(array $data)
{
$controllingField = $this->ConditionField();
if (!isset($data[$controllingField->Name])) {
return false;
}
$valid = false;
$targetFieldValue = $this->FieldValue;
$actualFieldValue = $data[$controllingField->Name];
switch ($this->ConditionOption) {
case 'IsNotBlank':
$valid = ($actualFieldValue !== '');
break;
case 'IsBlank':
$valid = ($actualFieldValue === '');
break;
case 'HasValue':
$valid = ($actualFieldValue === $targetFieldValue);
break;
case 'ValueNot':
$valid = ($actualFieldValue !== $targetFieldValue);
break;
case 'ValueLessThan':
$valid = ($actualFieldValue < $targetFieldValue);
break;
case 'ValueLessThanEqual':
$valid = ($actualFieldValue <= $targetFieldValue);
break;
case 'ValueGreaterThan':
$valid = ($actualFieldValue > $targetFieldValue);
break;
case 'ValueGreaterThanEqual':
$valid = ($actualFieldValue >= $targetFieldValue);
break;
default:
throw new LogicException("Unhandled rule {$this->ConditionOption}");
break;
}
return $valid;
}
/**
* Returns the opposite visibility function for the value of the initial visibility field, e.g. show/hide. This
* will toggle the "hide" class either way, which is handled by CSS.
*
* @param string $initialState
* @param boolean $invert
* @return string
*/
public function toggleDisplayText($initialState, $invert = false)
{
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$action = strtolower($initialState ?? '') === 'hide' ? 'removeClass' : 'addClass';
if ($invert) {
$action = $action === 'removeClass' ? 'addClass' : 'removeClass';
}
return sprintf('%s("hide")', $action);
}
/**
* Returns an event name to be dispatched when the field is changed. Matches up with the visibility classes
* added or removed in `toggleDisplayText()`.
*
* @param string $initialState
* @param bool $invert
* @return string
*/
public function toggleDisplayEvent($initialState, $invert = false)
{
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$action = strtolower($initialState ?? '') === 'hide' ? 'show' : 'hide';
if ($invert) {
$action = $action === 'hide' ? 'show' : 'hide';
}
return sprintf('userform.field.%s', $action);
}
}