Properties Methods Events Config Options Direct Link

    Observable
      BasicForm

# Class Ext.form.BasicForm

Package: | Ext.form
Defined In: | BasicForm.js
Class: | BasicForm
Extends: | Observable

Encapsulates the DOM <form> element at the heart of the FormPanel class, and provides input field management, validation, submission, and form loading services.

By default, Ext Forms are submitted through Ajax, using an instance of Ext.form.Action.Submit. To enable normal browser submission of an Ext Form, use the standardSubmit config option.

File Uploads

File uploads are not performed using Ajax submission, 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 "&lt;", "&" as "&amp;" 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.

## Config Options

Config Options | Defined By
--- | ---
| api : Object If specified load and submit actions will be handled with Ext.form.Action.DirectLoad and Ext.form.Action.DirectSubmit... If specified load and submit actions will be handled with Ext.form.Action.DirectLoad and Ext.form.Action.DirectSubmit. Methods which have been imported by Ext.Direct can be specified here to load and submit forms. Such as the following:
    api: {
        load: App.ss.MyProfile.load,
        submit: App.ss.MyProfile.submit
    }
Load actions can use `paramOrder` or `paramsAsHash` to customize how the load method is invoked. Submit actions will always use a standard form submit. The formHandler configuration must be set on the associated server-side method which has been imported by Ext.Direct | BasicForm
| baseParams : Object Parameters to pass with all requests. e.g. baseParams: {id: '123', foo: 'bar'}. Parameters are encoded as standard HT... Parameters to pass with all requests. e.g. baseParams: {id: '123', foo: 'bar'}. Parameters are encoded as standard HTTP parameters using Ext.urlEncode. | BasicForm
| errorReader : DataReader An Ext.data.DataReader (e.g. Ext.data.XmlReader) to be used to read field error messages returned from 'submit' actio... An Ext.data.DataReader (e.g. Ext.data.XmlReader) to be used to read field error messages returned from 'submit' actions. This is optional as there is built-in support for processing JSON. The Records which provide messages for the invalid Fields must use the Field name (or id) as the Record ID, and must contain a field called 'msg' which contains the error message. The errorReader does not have to be a full-blown implementation of a DataReader. It simply needs to implement a `read(xhr)` function which returns an Array of Records in an object with the following structure:
    {
        records: recordArray
    }
| BasicForm
| fileUpload : Boolean Set to true if this form is a file upload. File uploads are not performed using normal 'Ajax' techniques, that is the... Set to true if this form is a file upload. 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 "&lt;", "&" as "&amp;" 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. | BasicForm
| 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 Component's HTMLElement, listeners must be added to the Element after the Component has been rendered. A plugin can simplify this step:
    // Plugin is configured with a listeners config object.
    // The Component is appended to the argument list of all handler functions.
    Ext.DomObserver = Ext.extend(Object, {
        constructor: function(config) {
            this.listeners = config.listeners ? config.listeners : config;
        },

        // Component passes itself into plugin's init method
        init: function(c) {
            var p, l = this.listeners;
            for (p in l) {
                if (Ext.isFunction(l[p])) {
                    l[p] = this.createHandler(l[p], c);
                } else {
                    l[p].fn = this.createHandler(l[p].fn, c);
                }
            }

            // Add the listeners to the Element immediately following the render call
            c.render = c.render.createSequence(function() {
                var e = c.getEl();
                if (e) {
                    e.on(l);
                }
            });
        },

        createHandler: function(fn, c) {
            return function(e) {
                fn.call(this, e, c);
            };
        }
    });

    var combo = new Ext.form.ComboBox({

        // Collapse combo when its element is clicked on
        plugins: [ new Ext.DomObserver({
            click: function(evt, comp) {
                comp.collapse();
            }
        })],
        store: myStore,
        typeAhead: true,
        mode: 'local',
        triggerAction: 'all'
    });
| Observable
| method : String The request method to use (GET or POST) for form actions if one isn't supplied in the action options. | BasicForm
| paramOrder : Array/String A list of params to be executed server side. Defaults to undefined. Only used for the api load configuration. Specify... A list of params to be executed server side. Defaults to `undefined`. Only used for the `api` `load` configuration. Specify the params in the order in which they must be executed on the server-side as either (1) an Array of String values, or (2) a String of params delimited by either whitespace, comma, or pipe. For example, any of the following would be acceptable:
    paramOrder: ['param1','param2','param3']
    paramOrder: 'param1 param2 param3'
    paramOrder: 'param1,param2,param3'
    paramOrder: 'param1|param2|param'
| BasicForm
| paramsAsHash : Boolean Only used for the api load configuration. Send parameters as a collection of named arguments (defaults to false). Pro... Only used for the `api` `load` configuration. Send parameters as a collection of named arguments (defaults to `false`). Providing a `paramOrder` nullifies this configuration. | BasicForm
| reader : DataReader An Ext.data.DataReader (e.g. Ext.data.XmlReader) to be used to read data when executing 'load' actions. This is optio... An Ext.data.DataReader (e.g. Ext.data.XmlReader) to be used to read data when executing 'load' actions. This is optional as there is built-in support for processing JSON. For additional information on using an XMLReader see the example provided in examples/form/xml-form.html. | BasicForm
| standardSubmit : Boolean If set to true, standard HTML form submits are used instead of XHR (Ajax) style form submissions. Defaults to false. ... If set to `true`, standard HTML form submits are used instead of XHR (Ajax) style form submissions. Defaults to `false`. Note: When using `standardSubmit`, the `options` to `submit` are ignored because Ext's Ajax infrastracture is bypassed. To pass extra parameters (e.g. `baseParams` and `params`), utilize hidden fields to submit extra data, for example:
    new Ext.FormPanel({
        standardSubmit: true,
        baseParams: {
            foo: 'bar'
        },
        url: 'myProcess.php',
        items: [{
            xtype: 'textfield',
            name: 'userName'
        }],
        buttons: [{
            text: 'Save',
            handler: function(){
                var fp = this.ownerCt.ownerCt,
                    form = fp.getForm();
                if (form.isValid()) {
                    // check if there are baseParams and if
                    // hiddent items have been added already
                    if (fp.baseParams && !fp.paramsAdded) {
                        // add hidden items for all baseParams
                        for (i in fp.baseParams) {
                            fp.add({
                                xtype: 'hidden',
                                name: i,
                                value: fp.baseParams[i]
                            });
                        }
                        fp.doLayout();
                        // set a custom flag to prevent re-adding
                        fp.paramsAdded = true;
                    }
                    form.submit();
                }
            }
        }]
    });
| BasicForm
| timeout : Number Timeout for form actions in seconds (default is 30 seconds). | BasicForm
| trackResetOnLoad : Boolean If set to true, reset() resets to the last loaded or setValues() data instead of when the form was first created. De... If set to `true`, reset() resets to the last loaded or setValues() data instead of when the form was first created. Defaults to `false`. | BasicForm
| url : String The URL to use for form actions if one isn't supplied in the `doAction options`. | BasicForm
| waitTitle : String The default title to show for the waiting message box (defaults to `'Please Wait...'`) | BasicForm

## Public Properties

Property | Defined By
--- | ---
| items : MixedCollection A Ext.util.MixedCollection MixedCollection) containing all the Ext.form.Fields in this form. | BasicForm
| waitMsgTarget : Mixed By default wait messages are displayed with Ext.MessageBox.wait. You can target a specific element by passing it or i... By default wait messages are displayed with Ext.MessageBox.wait. You can target a specific element by passing it or its id or mask the form itself by passing in true. | BasicForm

## Public Methods

Method | Defined By
--- | ---
| BasicForm( `Mixed el`, `Object config` ) Parameters: `el` : Mixed The form element or its id `config` : Object Configuration options Returns: void | BasicForm
| add( `Field field1`, [`Field field2`], [`Field etc`] ) : BasicForm Add Ext.form Components to this form's Collection. This does not result in rendering of the passed Component, it just... Add Ext.form Components to this form's Collection. This does not result in rendering of the passed Component, it just enables the form to validate Fields, and distribute values to Fields. You will not usually call this function. In order to be rendered, a Field must be added to a Container, usually an FormPanel. The FormPanel to which the field is added takes care of adding the Field to the BasicForm's collection. Parameters: `field1` : Field `field2` : Field (optional) `etc` : Field (optional) Returns: `BasicForm` this | BasicForm
- | 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. Combining Options Using the options argument, it is possible to combine different types of listeners: A delayed, one-time listener.
      myDataView.on('click', 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.
      myGridPanel.on({
      'click' : {
          fn: this.onClick,
          scope: this,
          delay: 100
      },
      'mouseover' : {
          fn: this.onMouseOver,
          scope: this
      },
      'mouseout' : {
          fn: this.onMouseOut,
          scope: this
      }
      });
  Or a shorthand syntax:
      myGridPanel.on({
      'click' : this.onClick,
      'mouseover' : this.onMouseOver,
      'mouseout' : this.onMouseOut,
       scope: this
      });
Returns: void | Observable
| applyIfToFields( `Object values` ) : BasicForm Calls Ext.applyIf for all field in this form with the passed object. Calls Ext.applyIf for all field in this form with the passed object. Parameters: `values` : Object Returns: `BasicForm` this | BasicForm
| applyToFields( `Object values` ) : BasicForm Calls Ext.apply for all fields in this form with the passed object. Calls Ext.apply for all fields in this form with the passed object. Parameters: `values` : Object Returns: `BasicForm` this | BasicForm
| clearInvalid() : BasicForm Clears all invalid messages in this form. Clears all invalid messages in this form. Parameters: None. Returns: `BasicForm` this | BasicForm
| doAction( `String/Object actionName`, [`Object options`] ) : BasicForm Performs a predefined action (Ext.form.Action.Submit or Ext.form.Action.Load) or a custom extension of Ext.form.Actio... Performs a predefined action (Ext.form.Action.Submit or Ext.form.Action.Load) or a custom extension of Ext.form.Action to perform application-specific processing. Parameters: `actionName` : String/Object The name of the predefined action type, or instance of Ext.form.Action to perform. `options` : Object (optional) The options to pass to the Ext.form.Action. All of the config options listed below are supported by both the submit and load actions unless otherwise noted (custom actions could also accept other config options): url : String The url for the action (defaults to the form's url.) method : String The form method to use (defaults to the form's method, or POST if not defined) params : String/Object The params to pass (defaults to the form's baseParams, or none if not defined) Parameters are encoded as standard HTTP parameters using Ext.urlEncode. headers : Object Request headers to set for the action (defaults to the form's default headers) success : Function The callback that will be invoked after a successful response (see top of submit and load for a description of what constitutes a successful response). The function is passed the following parameters: `form` : Ext.form.BasicForm The form that requested the action `action` : The Action object which performed the operation. The action object contains these properties of interest: `response` `result` : interrogate for custom postprocessing `type` failure : Function The callback that will be invoked after a failed transaction attempt. The function is passed the following parameters: `form` : The Ext.form.BasicForm that requested the action. `action` : The Action object which performed the operation. The action object contains these properties of interest: `failureType` `response` `result` : interrogate for custom postprocessing `type` scope : Object The scope in which to call the callback functions (The `this` reference for the callback functions). clientValidation : Boolean Submit Action only. Determines whether a Form's fields are validated in a final call to isValid prior to submission. Set to `false` to prevent this. If undefined, pre-submission field validation is performed. Returns: `BasicForm` this | BasicForm
| enableBubble( `Object 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.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 Ext.formPanel({
        title: 'User Details',
        items: [{
            ...
        }],
        listeners: {
            change: function() {
    //          Title goes red if form has been modified.

                myForm.header.setStyle("color", "red");
            }
        }
    });
Parameters: `events` : Object The event name to bubble, or an Array of event names. Returns: void | Observable
| findField( `String id` ) : Field Find a Ext.form.Field in this form. Find a Ext.form.Field in this form. Parameters: `id` : String The value to search for (specify either a id, dataIndex, name or hiddenName). Returns: `Field` | BasicForm
| 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
| getEl() : Ext.Element Get the HTML form Element Get the HTML form Element Parameters: None. Returns: `Ext.Element` | BasicForm
| getValues( [`Boolean asString`] ) : String/Object Returns the fields in this form as an object with key/value pairs as they would be submitted using a standard form su... Returns the fields in this form as an object with key/value pairs as they would be submitted using a standard form submit. If multiple fields exist with the same name they are returned as an array. Note: The values are collected from all enabled HTML input elements within the form, not from the Ext Field objects. This means that all returned values are Strings (or Arrays of Strings) and that the value can potentially be the emptyText of a field. Parameters: `asString` : Boolean (optional) Pass true to return the values as a string. (defaults to false, returning an Object) Returns: `String/Object` | BasicForm
| 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
| isDirty() : Boolean Returns true if any fields in this form have changed from their original values. Note that if this BasicForm was conf... Returns true if any fields in this form have changed from their original values. Note that if this BasicForm was configured with trackResetOnLoad then the Fields' original values are updated when the values are loaded by setValues or loadRecord. Parameters: None. Returns: `Boolean` | BasicForm
| isValid() : Boolean Returns true if client-side validation on the form is successful. Returns true if client-side validation on the form is successful. Parameters: None. Returns: `Boolean` | BasicForm
| load( `Object options` ) : BasicForm Shortcut to do a load action. Shortcut to do a load action. Parameters: `options` : Object The options to pass to the action (see doAction for details) Returns: `BasicForm` this | BasicForm
| loadRecord( `Record record` ) : BasicForm Loads an Ext.data.Record into this form by calling setValues with the record data. See also trackResetOnLoad. Loads an Ext.data.Record into this form by calling setValues with the record data. See also trackResetOnLoad. Parameters: `record` : Record The record to load Returns: `BasicForm` this | BasicForm
| markInvalid( `Array/Object errors` ) : BasicForm Mark fields in this form invalid in bulk. Mark fields in this form invalid in bulk. Parameters: `errors` : Array/Object Either an array in the form [{id:'fieldId', msg:'The message'},...] or an object hash of {id: msg, id2: msg2} Returns: `BasicForm` this | BasicForm
| 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
| purgeListeners() : void Removes all listeners for this object Removes all listeners for this object Parameters: None. 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
| remove( `Field field` ) : BasicForm Removes a field from the items collection (does NOT remove its markup). Removes a field from the items collection (does NOT remove its markup). Parameters: `field` : Field Returns: `BasicForm` this | BasicForm
| 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
| render() : BasicForm Iterates through the Fields which have been added to this BasicForm, checks them for an id attribute, and calls Ext.f... Iterates through the Fields which have been added to this BasicForm, checks them for an id attribute, and calls Ext.form.Field.applyToMarkup on the existing dom element with that id. Parameters: None. Returns: `BasicForm` this | BasicForm
| reset() : BasicForm Resets this form. Resets this form. Parameters: None. Returns: `BasicForm` this | BasicForm
| 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
- | setValues( `Array/Object values` ) : BasicForm Set values for fields in this form in bulk. Set values for fields in this form in bulk. Parameters: `values` : Array/Object Either an array in the form:
      [{id:'clientName', value:'Fred. Olsen Lines'},
       {id:'portOfLoading', value:'FXT'},
       {id:'portOfDischarge', value:'OSL'} ]
  or an object hash of the form:
      {
          clientName: 'Fred. Olsen Lines',
          portOfLoading: 'FXT',
          portOfDischarge: 'OSL'
      }
Returns: `BasicForm` this | BasicForm
- | submit( `Object options` ) : BasicForm Shortcut to do a submit action. Shortcut to do a submit action. Parameters: `options` : Object The options to pass to the action (see doAction for details). Note: this is ignored when using the standardSubmit option. The following code:
      myFormPanel.getForm().submit({
          clientValidation: true,
          url: 'updateConsignment.php',
          params: {
              newStatus: 'delivered'
          },
          success: function(form, action) {
             Ext.Msg.alert('Success', action.result.msg);
          },
          failure: function(form, action) {
              switch (action.failureType) {
                  case Ext.form.Action.CLIENT_INVALID:
                      Ext.Msg.alert('Failure', 'Form fields may not be submitted with invalid values');
                      break;
                  case Ext.form.Action.CONNECT_FAILURE:
                      Ext.Msg.alert('Failure', 'Ajax communication failed');
                      break;
                  case Ext.form.Action.SERVER_INVALID:
                     Ext.Msg.alert('Failure', action.result.msg);
             }
          }
      });
  would process the following server response for a successful submission:
      {
          "success":true, // note this is Boolean, not string
          "msg":"Consignment updated"
      }
  and the following server response for a failed submission:
      {
          "success":false, // note this is Boolean, not string
          "msg":"You do not have permission to perform this operation"
      }
Returns: `BasicForm` this | BasicForm
| 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
| updateRecord( `Record record` ) : BasicForm Persists the values in this form into the passed Ext.data.Record object in a beginEdit/endEdit block. Persists the values in this form into the passed Ext.data.Record object in a beginEdit/endEdit block. Parameters: `record` : Record The record to edit Returns: `BasicForm` this | BasicForm

## Public Events

Event | Defined By
--- | ---
| actioncomplete : ( `Form this`, `Action action` ) Fires when an action is completed. Fires when an action is completed. Listeners will be called with the following arguments: `this` : Form `action` : Action The Ext.form.Action that completed | BasicForm
| actionfailed : ( `Form this`, `Action action` ) Fires when an action fails. Fires when an action fails. Listeners will be called with the following arguments: `this` : Form `action` : Action The Ext.form.Action that failed | BasicForm
| beforeaction : ( `Form this`, `Action action` ) Fires before any action is performed. Return false to cancel the action. Fires before any action is performed. Return false to cancel the action. Listeners will be called with the following arguments: `this` : Form `action` : Action The Ext.form.Action to be performed | BasicForm