设置FormPanle的topBar或bottomBar的status (JS)

<ext:FormPanel ID="panel" runat="server" Title="Test" ButtonAlign="Center" Width="300" Height="350" Draggable="true">

<TopBar>

<ext:StatusBar runat="server" />

</TopBar>

<Defaults>

<ext:Parameter Name="AllowBlank" Value="false" />

<ext:Parameter Name="MsgTarget" Value="side" />

</Defaults>

<Items>

<ext:TextField runat="server" ID="txtfield1" FieldLabel="邮箱：" LabelWidth="100" Vtype="email"/>

<ext:TextField runat="server" ID="txtfield2" FieldLabel="密码：" LabelWidth="100" Vtype="alpha"/>

</Items>

<BottomBar>

<ext:StatusBar runat="server"/>

</BottomBar>

<Listeners>

<ValidityChange Handler="this.dockedItems.get(2).setStatus({

text:valid?'form is valid':'form is invalid'});

#{btnlogin}.setDisabled(!valid)" />

</Listeners>

<Buttons>

<ext:Button runat="server" ID="btnlogin" Text="登陆" Disabled="true"/>

<ext:Button runat="server" ID="btncancel" Text="取消"/>

</Buttons>

</ext:FormPanel>