多選，增加時會記憶上一次的選中的內容，表單reset對其無效，通過此修改可使表單reset時也會跟著清空。

以下程式碼是在multiSelect.js的基礎上進行簡單修改的。

if('function' !== typeof RegExp.escape) {
RegExp.escape = function(s) {
   if('string' !== typeof s) {
    return s;
   }
   // Note: if pasting from forum, precede ]/\ with backslash manually
   return s.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
}; // eo function escape
}
// create namespace
Ext.ns('Ext.form');
Ext.form.MultiSelect = Ext.extend(Ext.form.ComboBox, {

	// {{{
	// configuration options

	checkField : 'checked'

	,
	multi:true
	,
	separator : ','

	// }}}
	// {{{
	,
	initComponent : function() {

		// template with checkbox
	 	if (!this.tpl) {
	 		 
			this.tpl = '<tpl for=".">' + '<div class="x-combo-list-item">'
					+ '<img src="' + Ext.BLANK_IMAGE_URL + '" '
					+ 'class="ux-MultiSelect-icon ux-MultiSelect-icon-'
					+ '{[values.' + this.checkField + '?"checked":"unchecked"'
					+ ']}">' + '{[values.' + this.displayField + ']}'
					+ '</div>' + '</tpl>';
	 	}

		// call parent
		Ext.form.MultiSelect.superclass.initComponent.apply(this, arguments);
		
		 
		// install internal event handlers
		this.on( {
			scope : this,
			beforequery : this.onBeforeQuery,
			blur : this.onRealBlur
		});

		// remove selection from input field
		this.onLoad = this.onLoad.createSequence(function() {
			if (this.el) {
				var v = this.el.dom.value;
				this.el.dom.value = '';
				this.el.dom.value = v;
			}
		});

	} // e/o function initComponent
	// }}}
	// {{{

	,
	initEvents : function() {
		Ext.form.MultiSelect.superclass.initEvents.apply(this, arguments);

		// disable default tab handling - does no good
		this.keyNav.tab = false;

	} // eo function initEvents
	// }}}
	// {{{

	,
	
    
    beforeBlur : function(){
       // this.assertValue();
    },

    
    postBlur  : function(){
//        Ext.form.ComboBox.superclass.postBlur.call(this);
//        this.collapse();
//        this.inKeyMode = false;
    },
            
	clearValue : function() {
		this.value = '';
		this.setRawValue(this.value);
		this.store.clearFilter();
		this.store.each(function(r) {
			r.set(this.checkField, false);
		}, this);
		if (this.hiddenField) {
			this.hiddenField.value = '';
		}
		this.applyEmptyText();
	} // eo function clearValue
	// }}}
	// {{{

	,
	getCheckedDisplay : function() {
		var re = new RegExp(this.separator, "g");
		return this.getCheckedValue(this.displayField).replace(re,
				this.separator + ' ');
	} // eo function getCheckedDisplay
	// }}}
	// {{{

	,
	getCheckedValue : function(field) {
		field = field || this.valueField;
		var c = [];

		// store may be filtered so get all records
		var snapshot = this.store.snapshot || this.store.data;

		snapshot.each(function(r) {
			if (r.get(this.checkField)) {
				c.push(r.get(field));
			}
		}, this);

		return c.join(this.separator);
	} // eo function getCheckedValue
	// }}}
	// {{{

	,
	onBeforeQuery : function(qe) {
		qe.query = qe.query.replace(new RegExp(RegExp.escape(this
				.getCheckedDisplay())
				+ '[ ' + this.separator + ']*'), '');
	} // eo function onBeforeQuery
	// }}}
	// {{{

	,
	onRealBlur : function() {
		this.list.hide();
		var rv = this.getRawValue();
		var rva = rv.split(new RegExp(RegExp.escape(this.separator) + ' *'));
		var va = [];
		var snapshot = this.store.snapshot || this.store.data;

		// iterate through raw values and records and check/uncheck items
		Ext.each(rva, function(v) {
			snapshot.each(function(r) {
				if (v === r.get(this.displayField)) {
					va.push(r.get(this.valueField));
				}
			}, this);
		}, this);
		this.setValue(va.join(this.separator));
		this.store.clearFilter();
	} // eo function onRealBlur
	// }}}
	// {{{

	,
	onSelect : function(record, index) {
		if (this.fireEvent('beforeselect', this, record, index) !== false) {

			// toggle checked field
			record.set(this.checkField, !record.get(this.checkField));
			 
			// display full list
			if (this.store.isFiltered()) {
				this.doQuery(this.allQuery);
			}

			// set (update) value and fire event
			if(this.multi){
				if(record.get("key")=="---" && record.get(this.checkField)){
					this.setValue("---");
			    }else
					this.setValue(this.getCheckedValue());
			}
			else{
				this.clearValue();
				this.value=record.get(this.valueField);
				this.setRawValue(record.get(this.displayField));
				this.list.hide();
			}
			
			//alert(this.value+"============================");
			this.fireEvent('select', this, record, index);
		}
	} // eo function onSelect
	// }}}
	// {{{

	,
	setValue : function(v) {
		if (v) {
			v = '' + v;
			if (this.valueField) {
				this.store.clearFilter();
				this.store.each(function(r) {
					var checked = !(!v.match('(^|' + this.separator + ')'
							+ RegExp.escape(r.get(this.valueField)) + '('
							+ this.separator + '|$)'));

					r.set(this.checkField, checked);
				}, this);
				this.value = this.getCheckedValue();
				this.setRawValue(this.getCheckedDisplay());
				if (this.hiddenField) {
					this.hiddenField.value = this.value;
				}
			} else {
				this.value = v;
				this.setRawValue(v);
				if (this.hiddenField) {
					this.hiddenField.value = v;
				}
			}
			if (this.el) {
				this.el.removeClass(this.emptyClass);
			}
		} else {
			//支援取消最後一個選項
			this.clearValue();
		}
	} // eo function setValue
	// }}}
	// {{{

	,
	selectAll : function() {
		this.store.each(function(record) {
			// toggle checked field
				record.set(this.checkField, true);
			}, this);

		// display full list
	this.doQuery(this.allQuery);
	this.setValue(this.getCheckedValue());
} // eo full selectAll
// }}}
// {{{

//支援reset
,reset:function(){
	this.clearValue();
}

,
deselectAll : function() {
	this.clearValue();
} // eo full deselectAll
	// }}}

}); // eo extend

// register xtype
Ext.reg('multiSelect', Ext.form.MultiSelect);