Ext Combobox

onLoad : function() {
		Dma.common.DmaCommon.superclass.onLoad.call(this);
		//给下拉列表添加SELECT ALL
		var snapshot = this.store.snapshot || this.store.data;
		var f = true;
		snapshot.each(function(r){
			if(r.get(this.displayField) == this.selectAllTxt){
				f = false;
			}	
		},this);
		if(f){
			var rec = new Ext.data.Record();
			rec.set(this.displayField, this.selectAllTxt);
			this.store.insert(0, rec);
		}
		/*if (this.flag == 0 && this.check) {
			if(this.displayAll){
				var rec = new Ext.data.Record();
				rec.set(this.displayField, this.selectAllTxt);
				this.store.insert(0, rec);
			}
		} else if (this.check) {
			var i = 0;
			var snapshot = this.store.snapshot || this.store.data;
			snapshot.each(function(r) {
						if (r.get(this.displayField) == this.selectAllTxt) {
							i = 1;
						}
					}, this);
			if (i != 1) {
				this.flag = -1;
			}
		}
		this.flag++;*/
		
		/*if(this.check && this.value!=null){
		
		//如果是在表格中，当前的value中有值，则点击展开下拉列表时要把下接列表中的相应部份选中,多个值的情况下用逗号分隔
			var rst=this.value.split(this.separator);
			var snapshot = this.store.snapshot || this.store.data;
			snapshot.each(function(r) {
				if(r.get(this.displayField) == this.selectAllTxt){
					if(this.hasSelectAll)
						r.set(this.checkField, true);
					else 
						r.set(this.checkField, false);
				} else{
					for(var i=0;i<rst.length;i++){
						if(rst[i]==r.get(this.displayField) || rst[i]==r.get(this.valueField)){
							r.set(this.checkField,true);
							break;
						}else{
							r.set(this.checkField,false);
						}
					}
				}
			},this);
		}*/
		
	},
	expand: function(){
		Dma.common.DmaCommon.superclass.expand.call(this);
		if(this.check ){
			var val = this.value == null ? '': this.value;
			var rst=val.split(this.separator);
			var snapshot = this.store.snapshot || this.store.data;
			snapshot.each(function(r) {
				if(this.hasSelectAll){
						r.set(this.checkField, true);
				} else{
					for(var i=0;i<rst.length;i++){
						if(rst[i]==r.get(this.displayField) || rst[i]==r.get(this.valueField)){
							r.set(this.checkField,true);
							break;
						}else{
							r.set(this.checkField,false);
						}
					}
				}
			},this);
		}
	},
	checkSelectAll: function(){
		var snapshot = this.store.snapshot || this.store.data;
		snapshot.each(function(r) {
			if(r.get(this.displayField) == this.selectAllTxt){
				if(this.hasSelectAll)
					r.set(this.checkField, true);
				else 
					r.set(this.checkField, false);
				return false;
			} 
		},this);
	},
	isSelectAll: function() {
		return this.hasSelectAll;
	},
	getHiddenValue: function(){
		return this.hiddenValue;
	}
});