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<com:TContent ID="body" >
<h1>ActiveControls (AJAX)</h1>
<p>Active Controls allows the browser to communicate with server
without refreshing the current page.
<h2>Standard Active Controls</h2>
<ul>
<li>
<a href="?page=ActiveControls.ActiveButton">TActiveButton</a>
represents a click button on a Web page. It can be used to trigger a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveCheckBox">TActiveCheckBox</a>
represents a checkbox on a Web page. It can be used to collect two-state user input
and can trigger a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveCustomValidator">TActiveCustomValidator</a>
validates a particular control using a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveHyperLink">TActiveHyperLink</a>
represents a hyperlink on a Web page.
</li>
<li>
<a href="?page=ActiveControls.ActiveImage">TActiveImage</a>
represents an image on a Web page.
</li>
<li>
<a href="?page=ActiveControls.ActiveImageButton">TActiveImageButton</a>
represents a click button that has an image as the background.
It is can be used to trigger a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveLabel">TActiveLabel</a>
represents a label on a Web page.
The label can be customized via various CSS attributes.
</li>
<li>
<a href="?page=ActiveControls.ActiveLinkButton">TActiveLinkButton</a>
represents a hyperlink that can perform a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActivePanel">TActivePanel</a>
represents a container for other controls on a Web page. In HTML,
it is displayed as a <div> element. The panel's contents
can be replaced during a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveRadioButton">TActiveRadioButton</a>
represents a radiobutton on a Web page.
It is mainly used in a group from which users make a choice. It can
be used to perform a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveTextBox">TActiveTextBox</a>
represents a text input field on a Web page.
It can collect single-line, multi-line or password text input from users.
It can be used to perform a callback request.
</li>
<li>
<a href="?page=ActiveControls.CallbackOptions">TCallbackOptions</a>
callback options such as <tt>OnLoading</tt/> client-side event handlers.
</li>
</ul>
<h2>Active List Controls</h2>
<ul>
<li>
<a href="?page=ActiveControls.ActiveCheckBoxList">TActiveCheckBoxList</a>
displays a list of checkboxes on a Web page and each checkbox
can trigger a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveDropDownList">TActiveDropDownList</a>
displays a dropdown list box that allows users to select a
single option from a few prespecified ones. It can be used
to perform a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveListBox">TActiveListBox</a>
displays a list box that allows single or multiple selection. It can be used
to perform a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActiveRadioButtonList">TActiveRadioButtonList</a>
is similar to TActiveCheckBoxList in every aspect except that each
TActiveRadioButtonList displays a group of radiobuttons. Each radio button
can perform a callback request.
</li>
</ul>
<h2>Extended Active Controls</h2>
<ul>
<li>
<a href="?page=ActiveControls.AutoComplete">TAutoComplete</a>
extends TActiveTextBox to offer text completion suggestions.
</li>
<li>
<a href="?page=ActiveControls.Callback">TCallback</a>
a generic control that can perform callback requests.
</li>
<li>
<a href="?page=ActiveControls.EventTriggeredCallback">TEventTriggeredCallback</a>
triggers a callback request based on HTML DOM events.
</li>
<li>
<a href="?page=ActiveControls.InPlaceTextBox">TInPlaceTextBox</a>
represents a label that can be edited by clicked.
</li>
<li>
<a href="?page=ActiveControls.TimeTriggeredCallback">TTimeTriggeredCallback</a>
triggers a callback request based on time elapsed.
</li>
<li>
<a href="?page=ActiveControls.ValueTriggeredCallback">TValueTriggeredCallback</a>
monitors (using a timer) an attribute of an HTML element and triggers a callback request
when the attribute value changes.
</li>
</ul>
<h2>Active Control Abilities</h2>
<!-- tabular: align=|l|l|l|, width=(0.55 0.15 0.15 0.15) -->
<table class="tabular">
<tr>
<th>Control Name</th>
<th>Can Update</th>
<th>Triggers Callback</th>
<th>Can Degrade</th>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveButton">TActiveButton</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveCheckBox">TActiveCheckBox</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveCustomValidator">TActiveCustomValidator</a>
</td>
<td>No</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveHyperLink">TActiveHyperLink</a>
</td>
<td>Yes</td><td>No</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveImage">TActiveImage</a>
</td>
<td>Yes</td><td>No</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveImageButton">TActiveImageButton</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveLabel">TActiveLabel</a>
</td>
<td>Yes</td><td>No</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveLinkButton">TActiveLinkButton</a>
</td>
<td>Yes</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActivePanel">TActivePanel</a>
</td>
<td>Yes</td><td>No</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveRadioButton">TActiveRadioButton</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveTextBox">TActiveTextBox</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.CallbackOptions">TCallbackOptions</a>
</td>
<td>No</td><td>No</td><td>N/A</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveCheckBoxList">TActiveCheckBoxList</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveDropDownList">TActiveDropDownList</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveListBox">TActiveListBox</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ActiveRadioButtonList">TActiveRadioButtonList</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.AutoComplete">TAutoComplete</a>
</td>
<td>Yes</td><td>Yes</td><td>Yes</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.Callback">TCallback</a>
</td>
<td>No</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.EventTriggeredCallback">TEventTriggeredCallback</a>
</td>
<td>No</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.InPlaceTextBox">TInPlaceTextBox</a>
</td>
<td>Yes</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.TimeTriggeredCallback">TTimeTriggeredCallback</a>
</td>
<td>No</td><td>Yes</td><td>No</td>
</tr>
<tr><td>
<a href="?page=ActiveControls.ValueTriggeredCallback">TValueTriggeredCallback</a>
</td>
<td>No</td><td>Yes</td><td>No</td>
</tr>
</table>
<h2>Active Control Infrastructure Classes</h2>
<p>The following classes provide the basic infrastructure classes required to
realize the active controls.</p>
<ul>
<li>
<a href="?page=ActiveControls.ActiveControlAdapter">TActiveControlAdapter</a>
tracks the viewstate values of the control and update differences of the client-side HTML
element attributes.
</li>
<li>
<a href="?page=ActiveControls.ActiveListControlAdapter">TActiveListControlAdapter</a>
allows the adapted list controls to change the selections on the client-side during
a callback request.
</li>
<li>
<a href="?page=ActiveControls.ActivePageAdapter">TActivePageAdapter</a>
process the page life-cycle for callback requests.
</li>
<li>
<a href="?page=ActiveControls.BaseActiveControl">TBaseActiveControl</a>
common active control methods and options.
</li>
<li>
<a href="?page=ActiveControls.CallbackClientScript">TCallbackClientScript</a>
methods to manipulate the client-side HTML elements, also includes methods
to invoke javascript Effects on HTML elements.
</li>
<li>
<a href="?page=ActiveControls.CallbackClientSide">TCallbackClientSide</a>
common client-side callback request options, and client-side event handlers.
</li>
<li>
<a href="?page=ActiveControls.CallbackResponseAdapter">TCallbackResponseAdapter</a>
HTTP response for callback requests.
</li>
</ul>
<p>
<img src="<%~ postback-callback.png %>" class="figure" />
</p>
<p>
<img src="<%~ TActiveButtonClass.png %>" class="figure"/>
</p>
</com:TContent>
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