Properties

Methods

Events

Config Options

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Observable
  Connection

Class Ext.data.Connection

Package:	Ext.data
Defined In:	Connection.js
Class:	Connection
Subclasses:	Ajax
Extends:	Observable

Config Options

Config Options		Defined By
	disableCaching : Boolean True to add a unique cache-buster param to GET requests. (defaults to true)	Connection
	disableCachingParam : String Change the parameter which is sent went disabling caching through a cache buster. Defaults to '_dc'	Connection
	listeners : Object A config object containing one or more event handlers to be added to this object during initialization. This should ... A config object containing one or more event handlers to be added to this object during initialization. This should be a valid listeners config object as specified in the addListener example for attaching multiple handlers at once. DOM events from ExtJs Components While some ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this is usually only done when extra value can be added. For example the DataView's `click` event passing the node clicked on. To access DOM events directly from a a child element of a Component, we need to specify this explicitly: `new Ext.Panel({ width: 400, height: 200, dockedItems: [{ xtype: 'toolbar' }], listeners: { click: { element: 'el', //bind to the underlying el property on the panel fn: function(){ console.log('click el'); } }, dblclick: { element: 'body', //bind to the underlying body property on the panel fn: function(){ console.log('dblclick body'); } } } });`	Observable
	timeout : Number The timeout in milliseconds to be used for requests. (defaults to 30000)	Connection

Public Properties

This class has no public properties.

Public Methods

Method		Defined By
	abort( [`Object request`] ) : void Aborts any outstanding request. Aborts any outstanding request. Parameters: `request` : Object (Optional) defaults to the last request Returns: void	Connection
	addEvents( `Object\|String o`, `string Optional.` ) : void Adds the specified events to the list of events which this Observable may fire. Adds the specified events to the list of events which this Observable may fire. Parameters: `o` : Object\|String Either an object with event names as properties with a value of `true` or the first event name string if multiple event names are being passed as separate parameters. `Optional.` : string Event name if multiple event names are being passed as separate parameters. Usage: `this.addEvents('storeloaded', 'storecleared');` Returns: void	Observable
	addListener( `String eventName`, `Function handler`, [`Object scope`], [`Object options`] ) : void Appends an event handler to this object. Appends an event handler to this object. Parameters: `eventName` : String The name of the event to listen for. `handler` : Function The method the event invokes. `scope` : Object (optional) The scope (`this` reference) in which the handler function is executed. If omitted, defaults to the object which fired the event. `options` : Object (optional) An object containing handler configuration. properties. This may contain any of the following properties: scope : Object The scope (`this` reference) in which the handler function is executed. If omitted, defaults to the object which fired the event. delay : Number The number of milliseconds to delay the invocation of the handler after the event fires. single : Boolean True to add a handler to handle just the next firing of the event, and then remove itself. buffer : Number Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed by the specified number of milliseconds. If the event fires again within that time, the original handler is not invoked, but the new handler is scheduled in its place. target : Observable Only call the handler if the event was fired on the target Observable, not if the event was bubbled up from a child Observable. element : String The element reference on the component to bind the event to. This is used to bind DOM events to underlying elements on Components. - This option is only valid for listeners bound to Components Combining Options Using the options argument, it is possible to combine different types of listeners: A delayed, one-time listener. `myPanel.on('hide', this.onClick, this, { single: true, delay: 100 });` Attaching multiple handlers in 1 call The method also allows for a single argument to be passed which is a config object containing properties which specify multiple handlers. Returns: void	Observable
	addManagedListener( `Observable\|Element item`, `Object\|String ename`, `Function fn`, `Object scope`, `Object opt` ) : void Adds listeners to any Observable object (or Element) which are automatically removed when this Component is destroyed... Adds listeners to any Observable object (or Element) which are automatically removed when this Component is destroyed. Parameters: `item` : Observable\|Element The item to which to add a listener/listeners. `ename` : Object\|String The event name, or an object containing event name properties. `fn` : Function Optional. If the `ename` parameter was an event name, this is the handler function. `scope` : Object Optional. If the `ename` parameter was an event name, this is the scope (`this` reference) in which the handler function is executed. `opt` : Object Optional. If the `ename` parameter was an event name, this is the addListener options. Returns: void	Observable
	clearListeners() : void Removes all listeners for this object including the managed listeners Removes all listeners for this object including the managed listeners Parameters: None. Returns: void	Observable
	clearManagedListeners() : void Removes all managed listeners for this object. Removes all managed listeners for this object. Parameters: None. Returns: void	Observable
	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 Ext.Components to bubble events to owner Containers. See Ext.Component.getBubbleTarget. The default implementation in 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: Ext.override(Ext.form.Field, { // Add functionality to Field's initComponent to enable the change event to bubble initComponent : Ext.createSequence(Ext.form.Field.prototype.initComponent, 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 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
	fireEvent( `String eventName`, `Object... args` ) : Boolean Fires the specified event with the passed parameters (minus the event name). An event may be set to bubble up an Obse... Fires the specified event with the passed parameters (minus the event name). An event may be set to bubble up an Observable parent hierarchy (See Ext.Component.getBubbleTarget) by calling enableBubble. Parameters: `eventName` : String The name of the event to fire. `args` : Object... Variable number of parameters are passed to handlers. Returns: `Boolean` returns false if any of the handlers return false otherwise it returns true.	Observable
	hasListener( `String eventName` ) : Boolean Checks to see if this object has any listeners for a specified event Checks to see if this object has any listeners for a specified event Parameters: `eventName` : String The name of the event to check for Returns: `Boolean` True if the event is being listened for, else false	Observable
	isLoading( [`Object request`] ) : Boolean Determine whether this object has a request outstanding. Determine whether this object has a request outstanding. Parameters: `request` : Object (Optional) defaults to the last transaction Returns: `Boolean` True if there is an outstanding request.	Connection
	on( `String eventName`, `Function handler`, [`Object scope`], [`Object options`] ) : void Appends an event handler to this object (shorthand for addListener.) Appends an event handler to this object (shorthand for addListener.) Parameters: `eventName` : String The type of event to listen for `handler` : Function The method the event invokes `scope` : Object (optional) The scope (`this` reference) in which the handler function is executed. If omitted, defaults to the object which fired the event. `options` : Object (optional) An object containing handler configuration. Returns: void	Observable
	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
	removeListener( `String eventName`, `Function handler`, [`Object scope`] ) : void Removes an event handler. Removes an event handler. Parameters: `eventName` : String The type of event the handler was associated with. `handler` : Function The handler to remove. This must be a reference to the function passed into the addListener call. `scope` : Object (optional) The scope originally specified for the handler. Returns: void	Observable
	removeManagedListener( `Observable\|Element item`, `Object\|String ename`, `Function fn`, `Object scope` ) : void Removes listeners that were added by the mon method. Removes listeners that were added by the mon method. Parameters: `item` : Observable\|Element The item from which to remove a listener/listeners. `ename` : Object\|String The event name, or an object containing event name properties. `fn` : Function Optional. If the `ename` parameter was an event name, this is the handler function. `scope` : Object Optional. If the `ename` parameter was an event name, this is the scope (`this` reference) in which the handler function is executed. Returns: void	Observable
	request( `Object options` ) : Object 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. `Ext.Ajax.request({ url: 'ajax_demo/sample.json', success: function(response, opts) { var obj = 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: `Object` request The request object. This may be used to cancel the request.	Connection
	resumeEvents() : void Resume firing events. (see suspendEvents) If events were suspended using the queueSuspended parameter, then all event... Resume firing events. (see suspendEvents) If events were suspended using the `queueSuspended` parameter, then all events fired during event suspension will be sent to any listeners now. Parameters: None. Returns: void	Observable
	suspendEvents( `Boolean queueSuspended` ) : void Suspend the firing of all events. (see resumeEvents) Suspend the firing of all events. (see resumeEvents) Parameters: `queueSuspended` : Boolean Pass as true to queue up suspended events to be fired after the resumeEvents call instead of discarding all suspended events; Returns: void	Observable
	un( `String eventName`, `Function handler`, [`Object scope`] ) : void Removes an event handler (shorthand for removeListener.) Removes an event handler (shorthand for removeListener.) Parameters: `eventName` : String The type of event the handler was associated with. `handler` : Function The handler to remove. This must be a reference to the function passed into the addListener call. `scope` : Object (optional) The scope originally specified for the handler. Returns: void	Observable

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 <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-... 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