flex复选框和下拉列表的几种用法整理_Flex_脚本之家
2014-01-18 17:19:19
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1.复选框
这里我主要研究的该控件的全选，全不选，反选以及选中的操作，原理也就是也能用selected这个属性，true表示选中，只需遍历就能实现，此处我使用的是动态的复选框，页面代码如下
复制代码 代码如下:
<mx:VBox top="50">
<mx:VBox>
<mx:Canvas width="100%" height="100%" >
<mx:Repeater id="rep" dataProvider="{array}">
<mx:CheckBox id="checkbox" label="{rep.currentItem.name}" x="{rep.currentItem.x}" data="{rep.currentItem.id}"/>
</mx:Repeater>
</mx:Canvas>
</mx:VBox>
<mx:VBox>
</mx:VBox>
</mx:VBox>
<s:Button x="90" y="81" label="全选" click="checkAll()"/>
<s:Button x="168" y="81" label="全不选" click="checkNotAll()"/>
<s:Button x="246" y="81" label="反选" click="reverse()"/>
刚看到可能比较陌生下面我把Array的定义贴出来
复制代码 代码如下:
public var array:Array=new Array({"name":"语文","id":"chinese","x":"80"},{"name":"数学","id":"math","x":"160"},{"name":"英语","id":"english","x":"240"});
这种处理一般是用于动态的数据，静态的就直接写了，下面是我的ActionScript
复制代码 代码如下:
//全选
private function checkAll():void{
for(var i:int=0;i<array.length;i++){
checkbox[i].selected=true;
all=all+checkbox[i].data+",";
}
Alert.show("选择了："+all.substr(0,all.lastIndexOf(",")));
all="";
}
//全不选
private function checkNotAll():void{
for(var i:int=0;i<array.length;i++){
checkbox[i].selected=false;
}
}
//反选
private function reverse():void{
for(var i:int=0;i<array.length;i++){
if(checkbox[i].selected){
checkbox[i].selected=false;
}else{
checkbox[i].selected=true;
}
}
}
很简单吧，下面是下拉的使用，我的做法是先初始化下拉把数据绑定上去，之后根据需要修改下拉显示的内容，只需合理运用好下拉的selectedItem就可以修改下拉选中的值了
复制代码 代码如下:
<mx:ComboBox id="subject" x="78" y="149" labelField="name" dataProvider="{array}"/>
下面是页面加载的初始化方法
<PRE class=java name="code">public function init(event:Event):void{
for(var i:int=0;i<array.length;i++){
if("数学"==array[i].name){
subject.selectedIndex=i;
checkbox[i].selected=true;
}
}
}</PRE><BR>
这里我顺便把数学的复选框弄成了默认选中<BR>
看起来代码有点乱，下面我把整个页面代码都贴出来<BR>
<PRE class=html name="code"><?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" initialize="init(event)">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.controls.Alert;
public var all:String="";
public var array:Array=new Array({"name":"语文","id":"chinese","x":"80"},{"name":"数学","id":"math","x":"160"},{"name":"英语","id":"english","x":"240"});
public function init(event:Event):void{
for(var i:int=0;i<array.length;i++){
if("数学"==array[i].name){
subject.selectedIndex=i;
checkbox[i].selected=true;
}
}
}
//全选
private function checkAll():void{
for(var i:int=0;i<array.length;i++){
checkbox[i].selected=true;
all=all+checkbox[i].data+",";
}
Alert.show("选择了："+all.substr(0,all.lastIndexOf(",")));
all="";
}
//全不选
private function checkNotAll():void{
for(var i:int=0;i<array.length;i++){
checkbox[i].selected=false;
}
}
//反选
private function reverse():void{
for(var i:int=0;i<array.length;i++){
if(checkbox[i].selected){
checkbox[i].selected=false;
}else{
checkbox[i].selected=true;
}
}
}
]]>
</fx:Script>
<mx:VBox top="50">
<mx:VBox>
<mx:Canvas width="100%" height="100%" >
<mx:Repeater id="rep" dataProvider="{array}">
<mx:CheckBox id="checkbox" label="{rep.currentItem.name}" x="{rep.currentItem.x}" data="{rep.currentItem.id}"/>
</mx:Repeater>
</mx:Canvas>
</mx:VBox>
<mx:VBox>
</mx:VBox>
</mx:VBox>
<s:Button x="90" y="81" label="全选" click="checkAll()"/>
<s:Button x="168" y="81" label="全不选" click="checkNotAll()"/>
<s:Button x="246" y="81" label="反选" click="reverse()"/>
<mx:ComboBox id="subject" x="78" y="149" labelField="name" dataProvider="{array}"/>
</s:Application>
</PRE><BR>
<BR>
<PRE></PRE>
<P></P>
<PRE></PRE>
<IMG alt="" src="http://img.blog.csdn.net/20130706214231250?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY2hlbndpbGwz/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center">
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