极湖

/*
 * 带清空功能的 ComboBox
*/
Ext.form.ClearableComboBox = Ext.extend(Ext.form.ComboBox, {
    initComponent: function(){
        Ext.form.ClearableComboBox.superclass.initComponent.call(this);
        this.addEvents('clear');
        
        this.triggerConfig = {
            tag:'span',
            cls:'x-form-twin-triggers',
            style:'padding-right:2px',
            cn:[
                {tag: "img", src: Ext.BLANK_IMAGE_URL, cls: "x-form-trigger"},
                {tag: "img", src: Ext.BLANK_IMAGE_URL, cls: "x-form-trigger x-form-clear-trigger"}
            ]
        };
    },

    getTrigger: function(index){
        return this.triggers[index];
    },

    initTrigger: function(){
        var ts = this.trigger.select('.x-form-trigger', true);
        this.wrap.setStyle('overflow', 'hidden');
        var triggerField = this;
        ts.each(function(t, all, index){
            t.hide = function(){
                var w = triggerField.wrap.getWidth();
                this.dom.style.display = 'none';
                triggerField.el.setWidth(w-triggerField.trigger.getWidth());
            };
            t.show = function(){
                var w = triggerField.wrap.getWidth();
                this.dom.style.display = '';
                triggerField.el.setWidth(w-triggerField.trigger.getWidth());
            };
            var triggerIndex = 'Trigger'+(index+1);

            if(this['hide'+triggerIndex]){
                t.dom.style.display = 'none';
            }
            t.on("click", this['on'+triggerIndex+'Click'], this, {preventDefault:true});
            t.addClassOnOver('x-form-trigger-over');
            t.addClassOnClick('x-form-trigger-click');
        }, this);
        this.triggers = ts.elements;
    },

    onTrigger1Click: function() {this.onTriggerClick()},
    onTrigger2Click: function() {this.clearValue(); this.fireEvent('clear', this)}
});