引入js

    1. //引入js文件
    2. <script src="../../../../Content/Scripts/Tool.js" type="text/javascript"></script>
    4. //给组件添加三个属性，和一个change事件
    5. EmptyText="1000字以内"   MaxLength="1000" EnforceMaxLength="true"
    7. 如下例子所示
    8. <ext:TextArea runat="server" ID="txTrackingShows" FieldLabel="项目跟踪说明" LabelAlign="Right" LabelWidth="90"
    9. Flex="1" MarginSpec="0 20 0 0" IndicatorText="*" IndicatorCls="_Indicator" AllowBlank="false" EmptyText="1000字以内"
    10.     MaxLength="1000" EnforceMaxLength="true">
    11.   <Listeners>
    12.     <Change Handler="LimitTextLength(this)" />
    13.   </Listeners>
    14. </ext:TextArea>