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    selectText : function(start, end){
        var v = this.getRawValue();
        var doFocus = false;
        if(v.length > 0){
            start = start === undefined ? 0 : start;
            end = end === undefined ? v.length : end;
            var d = this.el.dom;
            if(d.setSelectionRange){
                d.setSelectionRange(start, end);
            }else if(d.createTextRange){
                var range = d.createTextRange();
                range.moveStart('character', start);
                range.moveEnd('character', end-v.length);
                range.select();
            }
            doFocus = Ext.isGecko || Ext.isOpera;
        }else{
            doFocus = true;
        }
        if(doFocus){
            this.focus();
        }
    },

    /**
     * Automatically grows the field to accomodate the width of the text up to the maximum field width allowed.
     * This only takes effect if <tt><b>{@link #grow}</b> = true</tt>, and fires the {@link #autosize} event.
     */
    autoSize : function(){
        if(!this.grow || !this.rendered){
            return;
        }
        if(!this.metrics){
            this.metrics = Ext.util.TextMetrics.createInstance(this.el);
        }
        var el = this.el;
        var v = el.dom.value;
        var d = document.createElement('div');
        d.appendChild(document.createTextNode(v));
        v = d.innerHTML;
        Ext.removeNode(d);
        d = null;
        v += '&#160;';
        var w = Math.min(this.growMax, Math.max(this.metrics.getWidth(v) + /* add extra padding */ 10, this.growMin));
        this.el.setWidth(w);
        this.fireEvent('autosize', this, w);
    },
	
	onDestroy: function(){
		if(this.validationTask){
			this.validationTask.cancel();
			this.validationTask = null;
		}
		Ext.form.TextField.superclass.onDestroy.call(this);
	}
});
Ext.reg('textfield', Ext.form.TextField);
/**
 * @class Ext.form.TriggerField
 * @extends Ext.form.TextField
 * Provides a convenient wrapper for TextFields that adds a clickable trigger button (looks like a combobox by default).
 * The trigger has no default action, so you must assign a function to implement the trigger click handler by
 * overriding {@link #onTriggerClick}. You can create a TriggerField directly, as it renders exactly like a combobox
 * for which you can provide a custom implementation.  For example:
 * <pre><code>
var trigger = new Ext.form.TriggerField();
trigger.onTriggerClick = myTriggerFn;
trigger.applyToMarkup('my-field');
</code></pre>
 *
 * However, in general you will most likely want to use TriggerField as the base class for a reusable component.
 * {@link Ext.form.DateField} and {@link Ext.form.ComboBox} are perfect examples of this.
 *
 * @constructor
 * Create a new TriggerField.
 * @param {Object} config Configuration options (valid {@Ext.form.TextField} config options will also be applied
 * to the base TextField)
 * @xtype trigger
 */
Ext.form.TriggerField = Ext.extend(Ext.form.TextField,  {
    /**
     * @cfg {String} triggerClass
     * An additional CSS class used to style the trigger button.  The trigger will always get the
     * class <tt>'x-form-trigger'</tt> by default and <tt>triggerClass</tt> will be <b>appended</b> if specified.
     */
    /**
     * @cfg {Mixed} triggerConfig
     * <p>A {@link Ext.DomHelper DomHelper} config object specifying the structure of the
     * trigger element for this Field. (Optional).</p>
     * <p>Specify this when you need a customized element to act as the trigger button for a TriggerField.</p>
     * <p>Note that when using this option, it is the developer's responsibility to ensure correct sizing, positioning
     * and appearance of the trigger.  Defaults to:</p>
     * <pre><code>{tag: "img", src: Ext.BLANK_IMAGE_URL, cls: "x-form-trigger " + this.triggerClass}</code></pre>
     */
    /**
     * @cfg {String/Object} autoCreate <p>A {@link Ext.DomHelper DomHelper} element spec, or true for a default
     * element spec. Used to create the {@link Ext.Component#getEl Element} which will encapsulate this Component.
     * See <tt>{@link Ext.Component#autoEl autoEl}</tt> for details.  Defaults to:</p>
     * <pre><code>{tag: "input", type: "text", size: "16", autocomplete: "off"}</code></pre>
     */
    defaultAutoCreate : {tag: "input", type: "text", size: "16", autocomplete: "off"},
    /**
     * @cfg {Boolean} hideTrigger <tt>true</tt> to hide the trigger element and display only the base
     * text field (defaults to <tt>false</tt>)
     */
    hideTrigger:false,
    /**
     * @cfg {Boolean} editable <tt>false</tt> to prevent the user from typing text directly into the field,
     * the field will only respond to a click on the trigger to set the value. (defaults to <tt>true</tt>).
     */
    editable: true,
    /**
     * @cfg {Boolean} readOnly <tt>true</tt> to prevent the user from changing the field, and
     * hides the trigger.  Superceeds the editable and hideTrigger options if the value is true.
     * (defaults to <tt>false</tt>)
     */
    readOnly: false,
    /**
     * @cfg {String} wrapFocusClass The class added to the to the wrap of the trigger element. Defaults to
     * <tt>x-trigger-wrap-focus</tt>.
     */