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-rw-r--r--engine/lib/elgglib.php176
1 files changed, 176 insertions, 0 deletions
diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index fe4f4ea03..d162768f7 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -100,6 +100,182 @@ function forward($location = "") {
}
/**
+ * Register a JavaScript file for inclusion
+ *
+ * This function handles adding JavaScript to a web page. If multiple
+ * calls are made to register the same JavaScript file based on the $id
+ * variable, only the last file is included. This allows a plugin to add
+ * JavaScript from a view that may be called more than once. It also handles
+ * more than one plugin adding the same JavaScript.
+ *
+ * Plugin authors are encouraged to use the $id variable. jQuery plugins
+ * often have filenames such as jquery.rating.js. In that case, the id
+ * would be "jquery.rating". It is recommended to not use version numbers
+ * in the id.
+ *
+ * The JavaScript files can be local to the server or remote (such as
+ * Google's CDN).
+ *
+ * @param string $url URL of the JavaScript file
+ * @param string $id An identifier of the JavaScript library
+ * @param string $location Page location: head or footer. (default: head)
+ * @return bool
+ */
+function elgg_register_js($url, $id = '', $location = 'head') {
+ return elgg_register_external_file('javascript', $url, $id, $location);
+}
+
+/**
+ * Register a CSS file for inclusion in the HTML head
+ *
+ * @param string $url URL of the CSS file
+ * @param string $id An identifier for the CSS file
+ * @return bool
+ */
+function elgg_register_css($url, $id = '') {
+ return elgg_register_external_file('css', $url, $id, 'head');
+}
+
+/**
+ * Core registration function for external files
+ *
+ * @param string $type Type of external resource
+ * @param string $url URL
+ * @param string $id Identifier used as key
+ * @param string $location Location in the page to include the file
+ * @return bool
+ */
+function elgg_register_external_file($type, $url, $id, $location) {
+ global $CONFIG;
+
+ if (empty($url)) {
+ return false;
+ }
+
+ if (!isset($CONFIG->externals)) {
+ $CONFIG->externals = array();
+ }
+
+ if (!isset($CONFIG->externals[$type])) {
+ $CONFIG->externals[$type] = array();
+ }
+
+ if (!isset($CONFIG->externals[$type][$location])) {
+ $CONFIG->externals[$type][$location] = array();
+ }
+
+ if (!$id) {
+ $id = count($CONFIG->externals[$type][$location]);
+ } else {
+ $id = trim(strtolower($id));
+ }
+
+ $CONFIG->externals[$type][$location][$id] = $url;
+
+ return true;
+}
+
+/**
+ * Unregister a JavaScript file
+ *
+ * @param string $id The identifier for the JavaScript library
+ * @param string $url Optional URL to search for if id is not specified
+ * @param string $location Location in the page
+ * @return bool
+ */
+function elgg_unregister_js($id = '', $url = '', $location = 'head') {
+ return elgg_unregister_external_file('javascript', $id, $url, $location);
+}
+
+/**
+ * Unregister an external file
+ *
+ * @param string $id The identifier of the CSS file
+ * @param string $url Optional URL to search for if id is not specified
+ * @param string $location Location in the page
+ * @return bool
+ */
+function elgg_unregister_css($id = '', $url = '') {
+ return elgg_unregister_external_file('css', $id, $url, 'head');
+}
+
+/**
+ * Unregister an external file
+ *
+ * @param string $type Type of file: javascript or css
+ * @param string $id The identifier of the file
+ * @param string $url Optional URL to search for if the id is not specified
+ * @param string $location Location in the page
+ * @return bool
+ */
+function elgg_unregister_external_file($type, $id = '', $url = '', $location = 'head') {
+ global $CONFIG;
+
+ if (!isset($CONFIG->externals)) {
+ return false;
+ }
+
+ if (!isset($CONFIG->externals[$type])) {
+ return false;
+ }
+
+ if (!isset($CONFIG->externals[$type][$location])) {
+ return false;
+ }
+
+ if (array_key_exists($id, $CONFIG->externals[$type][$location])) {
+ unset($CONFIG->externals[$type][$location][$id]);
+ return true;
+ }
+
+ // was not registered with an id so do a search for the url
+ $key = array_search($url, $CONFIG->externals[$type][$location]);
+ if ($key) {
+ unset($CONFIG->externals[$type][$location][$key]);
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * Get the JavaScript URLs
+ *
+ * @return array
+ */
+function elgg_get_js($location = 'head') {
+ return elgg_get_external_file('javascript', $location);
+}
+
+/**
+ * Get the CSS URLs
+ *
+ * @return array
+ */
+function elgg_get_css() {
+ return elgg_get_external_file('css', 'head');
+}
+
+/**
+ * Get external resource descriptors
+ *
+ * @param string $type Type of resource
+ * @param string $location Page location
+ * @return array
+ */
+function elgg_get_external_file($type, $location) {
+ global $CONFIG;
+
+ if (isset($CONFIG->externals) &&
+ isset($CONFIG->externals[$type]) &&
+ isset($CONFIG->externals[$type][$location])) {
+
+ return array_values($CONFIG->externals[$type][$location]);
+ }
+ return array();
+}
+
+/**
* Returns the HTML for "likes" and "like this" on entities.
*
* @param ElggEntity $entity The entity to like