basicform.js

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/*
 * Ext JS Library 3.0 Pre-alpha
 * Copyright(c) 2006-2008, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.form.BasicForm
 * @extends Ext.util.Observable
 * <p>Encapsulates the DOM &lt;form> element at the heart of the {@link Ext.form.FormPanel FormPanel} class, and provides
 * input field management, validation, submission, and form loading services.</p>
 * <p>By default, Ext Forms are submitted through Ajax, using an instance of {@link Ext.form.Action.Submit}.
 * To enable normal browser submission of an Ext Form, use the {@link #standardSubmit} config option.</p>
 * <p><b><u>File Uploads</u></b></p>
 * <p>{@link #fileUpload File uploads} are not performed using Ajax submission, that
 * is they are <b>not</b> performed using XMLHttpRequests. Instead the form is submitted in the standard
 * manner with the DOM <tt>&lt;form></tt> element temporarily modified to have its
 * <a href="http://www.w3.org/TR/REC-html40/present/frames.html#adef-target">target</a> set to refer
 * to a dynamically generated, hidden <tt>&lt;iframe></tt> which is inserted into the document
 * but removed after the return data has been gathered.</p>
 * <p>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
 * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17">Content-Type</a> header
 * must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.</p>
 * <p>Characters which are significant to an HTML parser must be sent as HTML entities, so encode
 * "&lt;" as "&amp;lt;", "&amp;" as "&amp;amp;" etc.</p>
 * <p>The response text is retrieved from the document, and a fake XMLHttpRequest object
 * is created containing a <tt>responseText</tt> property in order to conform to the
 * requirements of event handlers and callbacks.</p>
 * <p>Be aware that file upload packets are sent with the content type <a href="http://www.faqs.org/rfcs/rfc2388.html">multipart/form</a>
 * and some server technologies (notably JEE) may require some custom processing in order to
 * retrieve parameter names and parameter values from the packet content.</p>
 * @constructor
 * @param {Mixed} el The form element or its id
 * @param {Object} config Configuration options
 */
Ext.form.BasicForm = function(el, config){
    Ext.apply(this, config);
    /*
     * @property items
     * A {@link Ext.util.MixedCollection MixedCollection) containing all the Ext.form.Fields in this form.
     * @type MixedCollection
     */
    this.items = new Ext.util.MixedCollection(false, function(o){
        return o.itemId || o.id || (o.id = Ext.id());
    });
    this.addEvents(
        /**
         * @event beforeaction
         * Fires before any action is performed. Return false to cancel the action.
         * @param {Form} this
         * @param {Action} action The {@link Ext.form.Action} to be performed
         */
        'beforeaction',
        /**
         * @event actionfailed
         * Fires when an action fails.
         * @param {Form} this
         * @param {Action} action The {@link Ext.form.Action} that failed
         */
        'actionfailed',
        /**
         * @event actioncomplete
         * Fires when an action is completed.
         * @param {Form} this
         * @param {Action} action The {@link Ext.form.Action} that completed
         */
        'actioncomplete'
    );

    if(el){
        this.initEl(el);
    }
    Ext.form.BasicForm.superclass.constructor.call(this);
};

Ext.extend(Ext.form.BasicForm, Ext.util.Observable, {
    /**
     * @cfg {String} method
     * The request method to use (GET or POST) for form actions if one isn't supplied in the action options.
     */
    /**
     * @cfg {DataReader} reader
     * An Ext.data.DataReader (e.g. {@link 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.
     */
    /**
     * @cfg {DataReader} errorReader
     * <p>An Ext.data.DataReader (e.g. {@link Ext.data.XmlReader}) to be used to read field error messages returned from "submit" actions.
     * This is completely optional as there is built-in support for processing JSON.</p>
     * <p>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.</p>
     * <p>The errorReader does not have to be a full-blown implementation of a DataReader. It simply needs to implement a 
     * <tt>read(xhr)</tt> function which returns an Array of Records in an object with the following structure:<pre><code>
{
    records: recordArray
}
</code></pre>
     */
    /**
     * @cfg {String} url
     * The URL to use for form actions if one isn't supplied in the {@link #doAction action} options.
     */
    /**
     * @cfg {Boolean} fileUpload
     * Set to true if this form is a file upload.
     * <p>File uploads are not performed using normal "Ajax" techniques, that is they are <b>not</b>
     * performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the
     * DOM <tt>&lt;form></tt> element temporarily modified to have its
     * <a href="http://www.w3.org/TR/REC-html40/present/frames.html#adef-target">target</a> set to refer
     * to a dynamically generated, hidden <tt>&lt;iframe></tt> which is inserted into the document
     * but removed after the return data has been gathered.</p>
     * <p>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
     * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17">Content-Type</a> header
     * must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.</p>
     * <p>Characters which are significant to an HTML parser must be sent as HTML entities, so encode
     * "&lt;" as "&amp;lt;", "&amp;" as "&amp;amp;" etc.</p>
     * <p>The response text is retrieved from the document, and a fake XMLHttpRequest object
     * is created containing a <tt>responseText</tt> property in order to conform to the
     * requirements of event handlers and callbacks.</p>
     * <p>Be aware that file upload packets are sent with the content type <a href="http://www.faqs.org/rfcs/rfc2388.html">multipart/form</a>
     * and some server technologies (notably JEE) may require some custom processing in order to
     * retrieve parameter names and parameter values from the packet content.</p>
     */
    /**
     * @cfg {Object} baseParams
     * <p>Parameters to pass with all requests. e.g. baseParams: {id: '123', foo: 'bar'}.</p>
     * <p>Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.</p>
     */
    /**
     * @cfg {Number} timeout Timeout for form actions in seconds (default is 30 seconds).
     */
    timeout: 30,

    // private
    activeAction : null,

    /**
     * @cfg {Boolean} trackResetOnLoad If set to <tt>true</tt>, {@link #reset}() resets to the last loaded
     * or {@link #setValues}() data instead of when the form was first created.  Defaults to <tt>false</tt>.
     */
    trackResetOnLoad : false,

    /**
     * @cfg {Boolean} standardSubmit If set to true, standard HTML form submits are used instead of XHR (Ajax) style
     * form submissions. (defaults to false)<br>
     * <p><b>Note:</b> When using standardSubmit, the options to {@link #submit} are ignored because Ext's
     * Ajax infrastracture is bypassed. To pass extra parameters (baseParams and params), you will need to
     * create hidden fields within the form.</p>
     * <p>The url config option is also bypassed, so set the action as well:</p>
     * <pre><code>
PANEL.getForm().getEl().dom.action = 'URL'
     * </code></pre>
     * An example encapsulating the above:
     * <pre><code>
new Ext.FormPanel({
    standardSubmit: true,
    baseParams: {
        foo: 'bar'
    },
    url: "myProcess.php",
    items: [{
        xtype: "textfield",
        name: "userName"
    }],
    buttons: [{
        text: "Save",
        handler: function(){
            var O = this.ownerCt;
            if (O.getForm().isValid()) {
                if (O.url) 
                    O.getForm().getEl().dom.action = O.url;
                if (O.baseParams) {
                    for (i in O.baseParams) {
                        O.add({
                            xtype: "hidden",
                            name: i,
                            value: O.baseParams[i]
                        })
                    }
                    O.doLayout();
                }
                O.getForm().submit();
            }
        }
    }]
});
     * </code></pre>
     */
    /**
     * 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.
     * @type Mixed
     * @property waitMsgTarget
     */

    // private
    initEl : function(el){
        this.el = Ext.get(el);
        this.id = this.el.id || Ext.id();
        if(!this.standardSubmit){
            this.el.on('submit', this.onSubmit, this);
        }
        this.el.addClass('x-form');
    },

    /**
     * Get the HTML form Element
     * @return Ext.Element
     */
    getEl: function(){
        return this.el;
    },

    // private
    onSubmit : function(e){
        e.stopEvent();
    },

    // private
    destroy: function() {
        this.items.each(function(f){
            Ext.destroy(f);
        });
        if(this.el){
            this.el.removeAllListeners();
            this.el.remove();
        }
        this.purgeListeners();
    },

    /**
     * Returns true if client-side validation on the form is successful.
     * @return Boolean
     */
    isValid : function(){
        var valid = true;
        this.items.each(function(f){
           if(!f.validate()){
               valid = false;
           }
        });
        return valid;
    },

    /**
     * <p>Returns true if any fields in this form have changed from their original values.</p>
     * <p>Note that if this BasicForm was configured with {@link #trackResetOnLoad} then the
     * Fields' <i>original values</i> are updated when the values are loaded by {@link #setValues}
     * or {@link #loadRecord}.</p>
     * @return Boolean
     */
    isDirty : function(){
        var dirty = false;
        this.items.each(function(f){
           if(f.isDirty()){
               dirty = true;
               return false;
           }
        });
        return dirty;
    },

    /**
     * Performs a predefined action ({@link Ext.form.Action.Submit} or
     * {@link Ext.form.Action.Load}) or a custom extension of {@link Ext.form.Action} 
     * to perform application-specific processing.
     * @param {String/Object} actionName The name of the predefined action type,
     * or instance of {@link Ext.form.Action} to perform.
     * @param {Object} options (optional) The options to pass to the {@link 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):<ul>
     * <li><b>url</b> : String<p class="sub-desc">The url for the action (defaults
     * to the form's {@link #url}.)</p></li>
     * <li><b>method</b> : String<p class="sub-desc">The form method to use (defaults
     * to the form's method, or POST if not defined)</p></li>
     * <li><b>params</b> : String/Object<div class="sub-desc"><p>The params to pass
     * (defaults to the form's baseParams, or none if not defined)</p>
     * <p>Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.</p></div></li>
     * <li><b>headers</b> : Object<p class="sub-desc">Request headers to set for the action
     * (defaults to the form's default headers)</p></li>
     * <li><b>success</b> : Function<p class="sub-desc">The callback that will
     * be invoked after a successful response. The function is passed the following parameters:<ul>
     * <li><tt>form</tt> : Ext.form.BasicForm<div class="sub-desc">The form that requested the action</div></li>
     * <li><tt>action</tt> : The {@link Ext.form.Action Action} object which performed the operation.
     * <div class="sub-desc">The action object contains these properties of interest:<ul>
     * <li><tt>{@link Ext.form.Action#response response}</tt></li>
     * <li><tt>{@link Ext.form.Action#result result}</tt> : interrogate for custom postprocessing</li>
     * <li><tt>{@link Ext.form.Action#type type}</tt></li>
     * </ul></p></li>
     * <li><b>failure</b> : Function
     * <div class="sub-desc">
     * <p>The callback that will be invoked after a failed transaction attempt. The function is
     * passed the following parameters:</p><ul>
     * <li><tt>form</tt> : The {@link Ext.form.BasicForm} that requested the action. 
     * <div class="sub-desc"></div></li>
     * <li><tt>action</tt> : The {@link Ext.form.Action Action} object which performed the operation.
     * <div class="sub-desc">The action object contains these properties of interest:<ul>
     * <li><tt>{@link Ext.form.Action#failureType failureType}</tt></li>
     * <li><tt>{@link Ext.form.Action#response response}</tt></li>
     * <li><tt>{@link Ext.form.Action#result result}</tt> : interrogate for custom postprocessing</li>
     * <li><tt>{@link Ext.form.Action#type type}</tt></li>
     * </ul></div></li></ul>
     * </div></li>
     * <li><b>scope</b> : Object<p class="sub-desc">The scope in which to call the
     * callback functions (The <tt>this</tt> reference for the callback functions).</p></li>
     * <li><b>clientValidation</b> : Boolean<p class="sub-desc">Submit Action only.
     * Determines whether a Form's fields are validated in a final call to
     * {@link Ext.form.BasicForm#isValid isValid} prior to submission. Set to <tt>false</tt>
     * to prevent this. If undefined, pre-submission field validation is performed.</p></li></ul>
     * @return {BasicForm} this
     */
    doAction : function(action, options){
        if(typeof action == 'string'){
            action = new Ext.form.Action.ACTION_TYPES[action](this, options);
        }
        if(this.fireEvent('beforeaction', this, action) !== false){
            this.beforeAction(action);
            action.run.defer(100, action);
        }
        return this;
    },

    /**
     * Shortcut to {@link #doAction do} a {@link Ext.form.Action.Submit submit action}.
     * @param {Object} options The options to pass to the action (see {@link #doAction} for details).<br>
     * <p><b>Note:</b> this is ignored when using the {@link #standardSubmit} option.</p>
     * <p>The following code:</p><pre><code>
myFormPanel.getForm().submit({
    clientValidation: true,
    url: 'updateConsignment.php',
    params: {
        newStatus: 'delivered'