Properties

Methods

Events

Config Options

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Observable
  Connection

Class CQ.Ext.data.Connection

Package:	CQ.Ext.data
Class:	Connection
Subclasses:	Ajax
Extends:	CQ.Ext.util.Observable
Clientlib:	cq.widgets

The class encapsulates a connection to the page's originating domain, allowing requests to be made either to a configured URL, or to a URL specified at request time.

Requests made by this class are asynchronous, and will return immediately. No data from the server will be available to the statement immediately following the request call. To process returned data, use a success callback in the request options object, or an event listener.

File Uploads

File uploads are not performed using normal "Ajax" techniques, that is they are not performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the DOM <form> element temporarily modified to have its target set to refer to a dynamically generated, hidden <iframe> which is inserted into the document but removed after the return data has been gathered.

The server response is parsed by the browser to create the document for the IFRAME. If the server is using JSON to send the return object, then the Content-Type header must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.

Characters which are significant to an HTML parser must be sent as HTML entities, so encode "<" as "<", "&" as "&" etc.

The response text is retrieved from the document, and a fake XMLHttpRequest object is created containing a responseText property in order to conform to the requirements of event handlers and callbacks.

Be aware that file upload packets are sent with the content type multipart/form and some server technologies (notably JEE) may require some custom processing in order to retrieve parameter names and parameter values from the packet content.

Also note that it's not possible to check the response code of the hidden iframe, so the success handler will ALWAYS fire.

Config Options

Config Options		Defined By
	autoAbort : Boolean (Optional) Whether this request should abort any pending requests. (defaults to false)	Connection
	defaultHeaders : Object (Optional) An object containing request headers which are added to each request made by this object. (defaults to und... (Optional) An object containing request headers which are added to each request made by this object. (defaults to undefined)	Connection
	disableCaching : Boolean (Optional) True to add a unique cache-buster param to GET requests. (defaults to true)	Connection
	disableCachingParam : String (Optional) Change the parameter which is sent went disabling caching through a cache buster. Defaults to '_dc'	Connection
	extraParams : Object (Optional) An object containing properties which are used as extra parameters to each request made by this object. (d... (Optional) An object containing properties which are used as extra parameters to each request made by this object. (defaults to undefined)	Connection
	method : String (Optional) The default HTTP method to be used for requests. (defaults to undefined; if not set, but request params ar... (Optional) The default HTTP method to be used for requests. (defaults to undefined; if not set, but request params are present, POST will be used; otherwise, GET will be used.)	Connection
	timeout : Number (Optional) The timeout in milliseconds to be used for requests. (defaults to CQ.REQUEST_TIMEOUT) (Optional) The timeout in milliseconds to be used for requests. (defaults to CQ.REQUEST_TIMEOUT)	Connection
	url : String (Optional) The default URL to be used for requests to the server. Defaults to undefined. The url config may be a func... (Optional) The default URL to be used for requests to the server. Defaults to undefined. The `url` config may be a function which returns the URL to use for the Ajax request. The scope (`this` reference) of the function is the `scope` option passed to the request method.	Connection

Public Properties

This class has no public properties.

Public Methods

Method		Defined By
	Connection( `Object config` ) Parameters: `config` : Object a configuration object. Returns:	Connection
	abort( [`Number transactionId`] ) : void Aborts any outstanding request. Aborts any outstanding request. Parameters: `transactionId` : Number (Optional) defaults to the last transaction Returns: `void`	Connection
	enableBubble( `String/Array events` ) : void Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if present.... Enables events fired by this Observable to bubble up an owner hierarchy by calling `this.getBubbleTarget()` if present. There is no implementation in the Observable base class. This is commonly used by CQ.Ext.Components to bubble events to owner Containers. See CQ.Ext.Component.getBubbleTarget. The default implementation in CQ.Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to access the required target more quickly. Example: CQ.Ext.override(CQ.Ext.form.Field, { // Add functionality to Field's initComponent to enable the change event to bubble initComponent : CQ.Ext.form.Field.prototype.initComponent.createSequence(function() { this.enableBubble('change'); }), // We know that we want Field's events to bubble directly to the FormPanel. getBubbleTarget : function() { if (!this.formPanel) { this.formPanel = this.findParentByType('form'); } return this.formPanel; } }); var myForm = new CQ.Ext.formPanel({ title: 'User Details', items: [{ ... }], listeners: { change: function() { // Title goes red if form has been modified. myForm.header.setStyle('color', 'red'); } } }); Parameters: `events` : String/Array The event name to bubble, or an Array of event names. Returns: `void`	Observable
	isLoading( [`Number transactionId`] ) : Boolean Determine whether this object has a request outstanding. Determine whether this object has a request outstanding. Parameters: `transactionId` : Number (Optional) defaults to the last transaction Returns: `Boolean` True if there is an outstanding request.	Connection
	relayEvents( `Object o`, `Array events` ) : void Relays selected events from the specified Observable as if the events were fired by `this`. Relays selected events from the specified Observable as if the events were fired by `this`. Parameters: `o` : Object The Observable whose events this object is to relay. `events` : Array Array of event names to relay. Returns: `void`	Observable
	request( [`Object options`] ) : Number Sends an HTTP request to a remote server. Important: Ajax server requests are asynchronous, and this call will return... Sends an HTTP request to a remote server. Important: Ajax server requests are asynchronous, and this call will return before the response has been received. Process any returned data in a callback function. `CQ.Ext.Ajax.request({ url: 'ajax_demo/sample.json', success: function(response, opts) { var obj = CQ.Ext.decode(response.responseText); console.dir(obj); }, failure: function(response, opts) { console.log('server-side failure with status code ' + response.status); } });` To execute a callback function in the correct scope, use the `scope` option. Parameters: `options` : Object An object which may contain the following properties: url : String/Function (Optional) The URL to which to send the request, or a function to call which returns a URL string. The scope of the function is specified by the `scope` option. Defaults to the configured `url`. params : Object/String/Function (Optional) An object containing properties which are used as parameters to the request, a url encoded string or a function to call to get either. The scope of the function is specified by the `scope` option. method : String (Optional) The HTTP method to use for the request. Defaults to the configured method, or if no method was configured, "GET" if no parameters are being sent, and "POST" if parameters are being sent. Note that the method name is case-sensitive and should be all caps. callback : Function (Optional) The function to be called upon receipt of the HTTP response. The callback is called regardless of success or failure and is passed the following parameters: options : Object The parameter to the request call. success : Boolean True if the request succeeded. response : Object The XMLHttpRequest object containing the response data. See http://www.w3.org/TR/XMLHttpRequest/ for details about accessing elements of the response. success : Function (Optional) The function to be called upon success of the request. The callback is passed the following parameters: response : Object The XMLHttpRequest object containing the response data. options : Object The parameter to the request call. failure : Function (Optional) The function to be called upon failure of the request. The callback is passed the following parameters: response : Object The XMLHttpRequest object containing the response data. options : Object The parameter to the request call. scope : Object (Optional) The scope in which to execute the callbacks: The "this" object for the callback function. If the `url`, or `params` options were specified as functions from which to draw values, then this also serves as the scope for those function calls. Defaults to the browser window. timeout : Number (Optional) The timeout in milliseconds to be used for this request. Defaults to 30 seconds. form : Element/HTMLElement/String (Optional) The `<form>` Element or the id of the `<form>` to pull parameters from. isUpload : Boolean (Optional) Only meaningful when used with the `form` option. True if the form object is a file upload (will be set automatically if the form was configured with `enctype` "multipart/form-data"). File uploads are not performed using normal "Ajax" techniques, that is they are not performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the DOM `<form>` element temporarily modified to have its target set to refer to a dynamically generated, hidden `<iframe>` which is inserted into the document but removed after the return data has been gathered. The server response is parsed by the browser to create the document for the IFRAME. If the server is using JSON to send the return object, then the Content-Type header must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body. The response text is retrieved from the document, and a fake XMLHttpRequest object is created containing a `responseText` property in order to conform to the requirements of event handlers and callbacks. Be aware that file upload packets are sent with the content type multipart/form and some server technologies (notably JEE) may require some custom processing in order to retrieve parameter names and parameter values from the packet content. headers : Object (Optional) Request headers to set for the request. xmlData : Object (Optional) XML document to use for the post. Note: This will be used instead of params for the post data. Any params will be appended to the URL. jsonData : Object/String (Optional) JSON data to use as the post. Note: This will be used instead of params for the post data. Any params will be appended to the URL. disableCaching : Boolean (Optional) True to add a unique cache-buster param to GET requests. The options object may also contain any other property which might be needed to perform postprocessing in a callback because it is passed to callback functions. Returns: `Number` transactionId The id of the server transaction. This may be used to cancel the request.	Connection

Public Events

Event		Defined By
	beforerequest : ( `Connection conn`, `Object options` ) Fires before a network request is made to retrieve a data object. Fires before a network request is made to retrieve a data object. Listeners will be called with the following arguments: `conn` : Connection This Connection object. `options` : Object The options config object passed to the request method.	Connection
	requestcomplete : ( `Connection conn`, `Object response`, `Object options` ) Fires if the request was successfully completed. Fires if the request was successfully completed. Listeners will be called with the following arguments: `conn` : Connection This Connection object. `response` : Object The XHR object containing the response data. See The XMLHttpRequest Object for details. `options` : Object The options config object passed to the request method.	Connection
	requestexception : ( `Connection conn`, `Object response`, `Object options` ) Fires if an error HTTP status was returned from the server. See HTTP Status Code Definitions for details of HTTP stat... Fires if an error HTTP status was returned from the server. See HTTP Status Code Definitions for details of HTTP status codes. Listeners will be called with the following arguments: `conn` : Connection This Connection object. `response` : Object The XHR object containing the response data. See The XMLHttpRequest Object for details. `options` : Object The options config object passed to the request method.	Connection