demos/quickstart/protected/pages/ActiveControls/CallbackOptions.page


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<com:TContent ID="body" >

<h1 id="154012">TCallbackOptions</h1>
<com:DocLink ClassPath="System.Web.UI.ActiveControls.TCallbackOptions" />

<p class="block-content">
<tt>TCallbackOptions</tt> allows a common set of callback client-side options
to be attached to one or more active controls. 
This can be useful if a lot of active controls on the same page are sharing the same callback client-side options.
Instead of specifying the same set of options again and again inside each control, these can be written once
inside a <tt>TCallbackOptions</tt>; this <tt>TCallbackOptions</tt> can be then attached to each control using the
<tt>ActiveControl.CallbackOptions</tt> property. For a full list of assignable properties, please check the 
<a href="?page=ActiveControls.CallbackClientSide">TCallbackClientSide</a> documentation.
</p>

<p class="block-content">
The typical scenario of use for a <tt>TCallbackOptions</tt> is a page where a lot of active controls needs to
pause the user interaction with a "Please wait" style message until callback completion.
First create a single <tt>TCallbackOptions</tt> control, assign it an ID and the the needed properties:
</p>

<com:TTextHighlighter Language="text" CssClass="source block-content" >
&lt;com:TCallbackOptions
	ID="MyOptions"
	ClientSide.OnLoading="... kindly inform the user that he should wait ..."
	ClientSide.OnComplete="... callback completed, ready to serve the user again ..."
/&gt;
</com:TTextHighlighter>

<p class="block-content">
Then, share this set of options to one or more active controls; each control will follow them:
</p>

<com:TTextHighlighter Language="text" CssClass="source block-content" >
&lt;com:TActiveButton
	Text="simple button"
	OnCallback="..."
	ActiveControl.CallbackOptions="MyOptions"
	...
/&gt;

&lt;com:TActiveCheckBox
	Text="simple checkbox"
	OnCallback="..."
	ActiveControl.CallbackOptions="MyOptions"
	...
/&gt;
</com:TTextHighlighter>

<com:RunBar PagePath="ActiveControls.Samples.TCallbackOptions.Home" />

</com:TContent>