silverstripe-framework/core/control/FormResponse.php

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<?php
/**
* This class collects all output that needs to be returned after an Form-Request to the client. It automatically determines
* if it needs to send back javascript after an Ajax-Request or just redirect to another page (on a normal request).
*
* FormResponse is also responsible for keeping the client- and serverside in sync after an HTTP-Request
* by collecting javascript-commands (which mostly trigger subsequent update-calls by Ajax.)
* Use the output as a return-value for Ajax-based saving methods. Be sure to check if the call is acutally "ajaxy"
* by checking Director::is_ajax(). It is the developers responsibility to include this into his custom form-methods.
* Use the Request-Parameter 'htmlonly' to enforce a pure HTML-response from the client-side.
*
* Example: A {@TableField} is in an incorrect state after being saved, as it still has rows marked as "new"
* which are already saved (and have an ID) in the database. By using AjaxSynchroniser we make sure that every instance
* is refreshed by Ajax and reflects the correct state.
*
* Caution:
* - FormResponse assumes that prototype.js is included on the client-side. (We can't put it into Requirements because it has to
* be included BEFORE an AjaxSynchroniser is called).
* - Please DON'T escape literal parameters which are passed to FormResponse, they are escaped automatically.
* - Some functions assume a {LeftAndMain}-based environment (e.g. load_form())
*
* @todo Force a specific execution order ($forceTop, $forceBottom)Ω
* @todo Extension to return different formats, e.g. JSON or XML
*
* WARNING: This should only be used within the CMS context. Please use markup or JSON to transfer state to the client,
* and react with javascript callbacks instead in other situations.
*
* @package forms
* @subpackage core
*/
class FormResponse {
/**
* @var $rules array
*/
static protected $rules = array();
/**
* @var $behaviour_apply_rules array Separated from $rules because
* we need to apply all behaviour at the very end of the evaluated script
* to make sure we include all possible Behaviour.register()-calls.
*/
static protected $behaviour_apply_rules = array();
/**
* @var $non_ajax_content string
*/
static protected $non_ajax_content;
/**
* Status-messages are accumulated, and the "worst" is chosen
*
* @var $status_messages array
*/
static protected $status_messages = array();
/**
* @var $redirect_url string
*/
static protected $redirect_url;
/**
* @var $redirect_url string
*/
static protected $status_include_order = array('bad', 'good', 'unknown');
/**
* Get all content as a javascript-compatible string (only if there is an Ajax-Request present).
* Falls back to {non_ajax_content}, {redirect_url} or Director::redirectBack() (in this order).
*
* @return string
*/
static function respond() {
// we don't want non-ajax calls to receive javascript
if(isset($_REQUEST['forcehtml'])) {
return self::$non_ajax_content;
} else if(isset($_REQUEST['forceajax']) || Director::is_ajax()) {
ContentNegotiator::disable();
// TODO figure out a way to stay backwards-compatible with Ajax.Evaluator and still use the automatic evaluating of Prototype
//header("Content-type: text/javascript");
return self::get_javascript();
} elseif(!empty(self::$non_ajax_content)) {
return self::$non_ajax_content;
} elseif(!empty(self::$redirect_url)) {
Director::redirect(self::$redirect_url);
return null;
} else {
Director::redirectBack();
return null;
}
}
/**
* Caution: Works only for forms which inherit methods from LeftAndMain.js
*/
static function load_form($content, $id = 'Form_EditForm') {
// make sure form-tags are stripped
// loadNewPage() uses innerHTML to replace the form, which makes IE cry when replacing an element with itself
$content = preg_replace(array('/<form[^>]*>/','/<\/form>/'), '', $content);
$JS_content = Convert::raw2js($content);
self::$rules[] = "\$('{$id}').loadNewPage('{$JS_content}');";
self::$rules[] = "\$('{$id}').initialize();";
}
/**
* Add custom scripts.
* Caution: Not escaped for backwards-compatibility.
*
* @param $scriptContent string
*
* @todo Should this content be escaped?
*/
static function add($scriptContent, $uniquenessID = null) {
if(isset($uniquenessID)) {
self::$rules[$uniquenessID] = $scriptContent;
} else {
self::$rules[] = $scriptContent;
}
}
static function clear() {
self::$rules = array();
}
/**
* @param $id int
*/
static function get_page($id, $form = 'Form_EditForm', $uniquenessID = null) {
$JS_id = (int)$id;
if($JS_id){
if(isset($uniquenessID)) {
self::$rules[$uniquenessID] = "\$('$form').getPageFromServer($JS_id);";
} else {
self::$rules[] = "\$('$form').getPageFromServer($JS_id);";
}
}
}
/**
* Sets the status-message (overlay-notification in the CMS).
* You can call this method multiple times, it will default to the "worst" statusmessage.
*
* @param $message string
* @param $status string
*/
static function status_message($message = "", $status = null) {
$JS_message = Convert::raw2js($message);
$JS_status = Convert::raw2js($status);
if(isset($JS_status)) {
self::$status_messages[$JS_status] = "statusMessage('{$JS_message}', '{$JS_status}');";
} else {
self::$status_messages['unknown'] = "statusMessage('{$JS_message}');";
}
}
/**
* Alias for status_message($messsage, 'bad')
*
* @param $message string
*/
static function error($message = "") {
$JS_message = Convert::raw2js($message);
self::$status_messages['bad'] = $JS_message;
}
/**
* Update the status (upper right corner) of the given Form
*
* @param $status string
* @param $form string
*/
static function update_status($status, $form = "Form_EditForm") {
$JS_form = Convert::raw2js($form);
$JS_status = Convert::raw2js($status);
self::$rules[] = "\$('$JS_form').updateStatus('$JS_status');";
}
/**
* Set the title of a single page in the pagetree
*
* @param $id int
* @param $title string
*/
static function set_node_title($id, $title = "") {
$JS_id = Convert::raw2js($id);
$JS_title = Convert::raw2js($title);
self::$rules[] = "$('sitetree').setNodeTitle('$JS_id', '$JS_title');";
}
/**
* Fallback-method to supply normal HTML-response when not being called by ajax.
*
* @param $content string HTML-content
*/
static function set_non_ajax_content($content) {
self::$non_ajax_content = $content;
}
/**
* @param $url string
*/
static function set_redirect_url($url) {
self::$redirect_url = $url;
}
/**
* @return string
*/
static function get_redirect_url() {
return self::$redirect_url;
}
/**
* Replace a given DOM-element with the given content.
* It automatically prefills {$non_ajax_content} with the passed content (as a fallback).
*
* @param $domID string The DOM-ID of an HTML-element that should be replaced
* @param $domContent string The new HTML-content
* @param $reapplyBehaviour boolean Applies behaviour to the given domID after refreshing it
* @param $replaceMethod string Method for replacing - either 'replace' (=outerHTML) or 'update' (=innerHTML)
* (Caution: "outerHTML" might cause problems on the client-side, e.g. on table-tags)
*
* @todo More fancy replacing with loading-wheel etc.
*/
static function update_dom_id($domID, $domContent, $reapplyBehaviour = true, $replaceMethod = 'replace', $uniquenessID = null) {
//self::$non_ajax_content = $domContent;
$JS_domID = Convert::raw2js($domID);
$JS_domContent = Convert::raw2js($domContent);
$JS_replaceMethod = Convert::raw2js($replaceMethod);
if(isset($uniquenessID)) {
self::$rules[$uniquenessID] = "Element.$JS_replaceMethod('{$JS_domID}','{$JS_domContent}');";
} else {
self::$rules[] = "Element.$JS_replaceMethod('{$JS_domID}','{$JS_domContent}');";
}
if($reapplyBehaviour) {
if(isset($uniquenessID)) {
self::$behaviour_apply_rules[$uniquenessID] .= "Behaviour.apply('{$JS_domID}', true);";
} else {
self::$behaviour_apply_rules[] = "Behaviour.apply('{$JS_domID}', true);";
}
}
}
/**
* @return string Compiled string of javascript-function-calls (needs to be evaluated on the client-side!)
*/
protected static function get_javascript() {
$js = "";
// select only one status message (with priority on "bad" messages)
$msg = "";
foreach(self::$status_include_order as $status) {
if(isset(self::$status_messages[$status])) {
$msg = self::$status_messages[$status];
break;
}
}
if(!empty($msg)) self::$rules[] = $msg;
$js .= implode("\n", self::$rules);
$js .= Requirements::get_custom_scripts();
// make sure behaviour is applied AFTER all registers are collected
$js .= implode("\n", self::$behaviour_apply_rules);
return $js;
}
}
?>