Button AutoPostBack to "false"

[geoffrey.mcgill]

The default value of the .AutoPostBack property on the <ext:Button> has been changed from "true" to "false".

In Visual Studio DesignMode, double clicking on the <ext:Button> will automatically wire up the "OnClick" event handler, but as with other postback enabled controls, such as <asp:TextBox>, the developer will now have to explicitly set the .AutoPostBack property to "true".

The following sample demonstrates a simple <ext:Button> which post's back to the server.

Example

<ext:Button ID="Button1" runat="server" Text="Submit" &#111;nclick="Button1_Click" AutoPostBack="true" />

The .AutoPostBack="true" property must be set if you are using the <ext:Button> in conjunction with an <asp:UpdatePanel> and wish to have the Button trigger the UpdatePanel to do an AsycPostBack.

The following example demonstrates setting the <ext:Button> as an AsyncPostBackTrigger on the <asp:UpdatePanel>.

Example

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Button1" />
    </Triggers>
</asp:UpdatePanel>
        
<ext:Button ID="Button1" runat="server" Text="Submit" &#111;nclick="Button1_Click" AutoPostBack="true" />

This change to the .AutoPostBack default property value was done to encourage the use of the <AjaxEvents> (server-side) and <Listeners> (client-side> properties.

The following sample demonstrates a simple <Click> AjaxEvent added to an <ext:Button>.

Example

<script runat="server">
    protected void Button1_Click(object sender, AjaxEventArgs e)
    {
        this.Window1.Show();
    }
</script>


<ext:Button ID="Button2" runat="server" Text="Submit">
    <AjaxEvents>
        <Click OnEvent="Button1_Click" />
    </AjaxEvents>
</ext:Button>

The following sample demonstrates the same logic, but using the client-side <Click> Listener.

Example

<ext:Button ID="Button2" runat="server" Text="Submit">
    <Listeners>
        <Click Handler="#{Window1}.show();" />
    </Listeners>
</ext:Button>

Note how in both the above <AjaxEvents> and <Listeners> the .AutoPostBack property is no longer required to be set to "false".

Hope this helps.

[amitpareek]

Cool... Making the simple tasks even simpler... Thanks...

Any news on 6.0 release? Or possible to have latest build from SVN?

Thanks,