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Diffstat (limited to 'js/lib/ajax.js')
-rw-r--r-- | js/lib/ajax.js | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/js/lib/ajax.js b/js/lib/ajax.js new file mode 100644 index 000000000..b3f39cc42 --- /dev/null +++ b/js/lib/ajax.js @@ -0,0 +1,242 @@ +/*globals elgg, $*/ +elgg.provide('elgg.ajax'); + +/** + * @author Evan Winslow + * Provides a bunch of useful shortcut functions for making ajax calls + */ + +/** + * Wrapper function for jQuery.ajax which ensures that the url being called + * is relative to the elgg site root. + * + * You would most likely use elgg.get or elgg.post, rather than this function + * + * @param {string} url Optionally specify the url as the first argument + * @param {Object} options Optional. {@see jQuery#ajax} + * @return {XmlHttpRequest} + */ +elgg.ajax = function(url, options) { + options = elgg.ajax.handleOptions(url, options); + + options.url = elgg.normalize_url(options.url); + return $.ajax(options); +}; +/** + * @const + */ +elgg.ajax.SUCCESS = 0; + +/** + * @const + */ +elgg.ajax.ERROR = -1; + +/** + * Handle optional arguments and return the resulting options object + * + * @param url + * @param options + * @return {Object} + * @private + */ +elgg.ajax.handleOptions = function(url, options) { + var data_only = true, + data, + member; + + //elgg.ajax('example/file.php', {...}); + if (elgg.isString(url)) { + options = options || {}; + + //elgg.ajax({...}); + } else { + options = url || {}; + url = options.url; + } + + //elgg.ajax('example/file.php', function() {...}); + if (elgg.isFunction(options)) { + data_only = false; + options = {success: options}; + } + + //elgg.ajax('example/file.php', {data:{...}}); + if (options.data) { + data_only = false; + } else { + for (member in options) { + //elgg.ajax('example/file.php', {callback:function(){...}}); + if (elgg.isFunction(options[member])) { + data_only = false; + } + } + } + + //elgg.ajax('example/file.php', {notdata:notfunc}); + if (data_only) { + data = options; + options = {data: data}; + } + + if (url) { + options.url = url; + } + + return options; +}; + +/** + * Wrapper function for elgg.ajax which forces the request type to 'get.' + * + * @param {string} url Optionally specify the url as the first argument + * @param {Object} options {@see jQuery#ajax} + * @return {XmlHttpRequest} + */ +elgg.get = function(url, options) { + options = elgg.ajax.handleOptions(url, options); + + options.type = 'get'; + return elgg.ajax(options); +}; + +/** + * Wrapper function for elgg.get which forces the dataType to 'json.' + * + * @param {string} url Optionally specify the url as the first argument + * @param {Object} options {@see jQuery#ajax} + * @return {XmlHttpRequest} + */ +elgg.getJSON = function(url, options) { + options = elgg.ajax.handleOptions(url, options); + + options.dataType = 'json'; + return elgg.get(options); +}; + +/** + * Wrapper function for elgg.ajax which forces the request type to 'post.' + * + * @param {string} url Optionally specify the url as the first argument + * @param {Object} options {@see jQuery#ajax} + * @return {XmlHttpRequest} + */ +elgg.post = function(url, options) { + options = elgg.ajax.handleOptions(url, options); + + options.type = 'post'; + return elgg.ajax(options); +}; + +/** + * Perform an action via ajax + * + * @example Usage 1: + * At its simplest, only the action name is required (and anything more than the + * action name will be invalid). + * <pre> + * elgg.action('name/of/action'); + * </pre> + * + * The action can be relative to the current site ('name/of/action') or + * the full URL of the action ('http://elgg.org/action/name/of/action'). + * + * @example Usage 2: + * If you want to pass some data along with it, use the second parameter + * <pre> + * elgg.action('friend/add', { friend: some_guid }); + * </pre> + * + * @example Usage 3: + * Of course, you will have no control over what happens when the request + * completes if you do it like that, so there's also the most verbose method + * <pre> + * elgg.action('friend/add', { + * data: { + * friend: some_guid + * }, + * success: function(json) { + * //do something + * }, + * } + * </pre> + * You can pass any of your favorite $.ajax arguments into this second parameter. + * + * @note If you intend to use the second field in the "verbose" way, you must + * specify a callback method or the data parameter. If you do not, elgg.action + * will think you mean to send the second parameter as data. + * + * @note You do not have to add security tokens to this request. Elgg does that + * for you automatically. + * + * @see jQuery.ajax + * + * @param {String} action The action to call. + * @param {Object} options + * @return {XMLHttpRequest} + */ +elgg.action = function(action, options) { + elgg.assertTypeOf('string', action); + + // support shortcut and full URLs + // this will mangle URLs that aren't elgg actions. + // Use post, get, or ajax for those. + if (action.indexOf('action/') < 0) { + action = 'action/' + action; + } + + options = elgg.ajax.handleOptions(action, options); + + // This is a misuse of elgg.security.addToken() because it is not always a + // full query string with a ?. As such we need a special check for the tokens. + if (!elgg.isString(options.data) || options.data.indexOf('__elgg_ts') == -1) { + options.data = elgg.security.addToken(options.data); + } + options.dataType = 'json'; + + //Always display system messages after actions + var custom_success = options.success || elgg.nullFunction; + options.success = function(json, two, three, four) { + if (json && json.system_messages) { + elgg.register_error(json.system_messages.error); + elgg.system_message(json.system_messages.success); + } + + custom_success(json, two, three, four); + }; + + return elgg.post(options); +}; + +/** + * Make an API call + * + * @example Usage: + * <pre> + * elgg.api('system.api.list', { + * success: function(data) { + * console.log(data); + * } + * }); + * </pre> + * + * @param {String} method The API method to be called + * @param {Object} options {@see jQuery#ajax} + * @return {XmlHttpRequest} + */ +elgg.api = function (method, options) { + elgg.assertTypeOf('string', method); + + var defaults = { + dataType: 'json', + data: {} + }; + + options = elgg.ajax.handleOptions(method, options); + options = $.extend(defaults, options); + + options.url = 'services/api/rest/' + options.dataType + '/'; + options.data.method = method; + + return elgg.ajax(options); +}; |