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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.extendUrl(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) {
//elgg.ajax('example/file.php', {...});
if(typeof url == 'string') {
options = options || {};
//elgg.ajax({...});
} else {
options = url || {};
url = options.url;
}
var data_only = true;
//elgg.ajax('example/file.php', function() {...});
if (typeof options == 'function') {
data_only = false;
options = {success: options};
}
//elgg.ajax('example/file.php', {data:{...}});
if(options.data) {
data_only = false;
} else {
for (var member in options) {
//elgg.ajax('example/file.php', {callback:function(){...}});
if(typeof options[member] == 'function') {
data_only = false;
}
}
}
//elgg.ajax('example/file.php', {notdata:notfunc});
if (data_only) {
var 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>
* Note that it will *not* love you if you specify the full url as the action
* (i.e. elgg.yoursite.com/action/name/of/action), but why would you want to do
* that anyway, when you can just specify the action name?
*
* @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.
*
* @param {String} action The action to call.
* @param {Object} options {@see jQuery#ajax}
* @return {XMLHttpRequest}
*/
elgg.action = function(action, options) {
if(!action) {
throw new TypeError("action must be specified");
} else if (typeof action != 'string') {
throw new TypeError("action must be a string");
}
options = elgg.ajax.handleOptions('action/' + action, options);
options.data = elgg.security.addToken(options.data);
options.dataType = 'json';
//Always display system messages after actions
var custom_success = options.success || function(){};
options.success = function(json, two, three, four) {
if (json.system_messages) {
elgg.register_error(json.system_messages.errors);
elgg.system_message(json.system_messages.messages);
}
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) {
if (!method) {
throw new TypeError("method must be specified");
} else if (typeof method != 'string') {
throw new TypeError("method must be a string");
}
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);
};
/**
* @param {string} selector a jQuery selector
* @param {Function} complete A function to execute when the refresh is done
* @return {XMLHttpRequest}
*/
elgg.refresh = function(selector, complete) {
$(selector).html('<div align="center" class="ajax_loader"></div>');
return $(selector).load(location.href + ' ' + selector + ' > *', complete);
};
/**
* @param {string} selector a jQuery selector (usually an #id)
* @param {number} interval The refresh interval in seconds
* @param {Function} complete A function to execute when the refresh is done
* @return {number} The interval identifier
*/
elgg.feed = function(selector, interval, complete) {
return setInterval(function() {
elgg.refresh(selector, complete);
}, interval);
};
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