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<com:TContent ID="body" >
<!-- $Id$ -->
<h1 id="128031">Active Controls (AJAX enabled Controls)</h1>
<p id="640423" class="block-content">See the <a href="?page=ActiveControls.Introduction">Introduction</a>
for a quick overview of the concept behind active controls (AJAX enabled controls).
Most active controls have a property of
<a href="?page=ActiveControls.BaseActiveControl">ActiveControl</a> and
a sub-property <a href="?page=ActiveControls.CallbackClientSide">ClientSide</a>
that provides many properties to customize the controls. The
<a href="?page=TCallbackClientScript">CallbackClient</a> property of the
<tt>TPage</tt> class provides many methods to update and alter the client-side content
during a callback request. Active controls is reliant on a collection
of <a href="?page=ActiveControl.ClientSideJavascript">javascript classes</a>.
</p>

<p id="640424" class="block-content">For a quick demo of active controls, try the <a href="?page=ActiveControls.ActiveButton">
TActiveButton</a> control. See also the later part of the <a href="?page=Tutorial.CurrencyConverter">Currency Converter</a> tutorial for a more in depth example.
</p>

<p id="640425" class="block-content">* the tutorial for this control is not completed yet.</p>

<h2 id="128032">Standard Active Controls</h2>
<ul id="u1" class="block-content">
  <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.ActiveMultiView">TActiveMultiView</a>
    represents a container for a group of TView controls, each of which is container for other controls.
    At any time, at most one TView is visible. It's the active counterpart of TMultiView.
  </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 &lt;div&gt; element. The panel's contents
  can be replaced during a callback request.
  </li>

  <li>
  <a href="?page=ActiveControls.ActivePager">TActivePager</a>
  generates UI that allows users to interactively specify which page of
  data to be displayed in a data-bound control.
  </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 id="128033">Active List Controls</h2>
<ul id="u2" class="block-content">
  <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 id="134001">Active Data Controls</h2>
<ul id="u2" class="block-content">
  <li>
  * <a href="?page=ActiveControls.ActiveDataList">TActiveDataList</a>
  is used to display or modify a list of data items. It is the
  active counterpart to the original TDataList control.
  </li>

  <li>
  * <a href="?page=ActiveControls.ActiveDataGrid">TActiveDataGrid</a>
  displays data in a tabular format with rows and columns. It is the
  active counterpart to the original TDataGrid control.
  </li>

  <li>
  * <a href="?page=ActiveControls.ActiveRepeater">TActiveRepeater</a>
  displays its content defined in templates repeatedly based on the given data.
  It is the active counterpart to the original TRepeater control.
  </li>
</ul>

<h2 id="128034">Extended Active Controls</h2>


<ul id="u3" class="block-content">
	<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>
	
	<li>
	<a href="?page=ActiveControls.DragDrop">TDropContainer & TDraggable</a> represents drag and drop containers. 
		The former will make its child controls "draggable" while the latter will raise a callback when a draggable
		control is dropped on it.
	</li>

</ul>

<h2 id="128035">Active Control Abilities</h2>
<p id="640426" class="block-content">The following table shows the Active Controls that can trigger a
callback event and whether the control will raise a PostBack event
if Javascript was disabled on the client's browser.</p>
<!-- tabular: align=|l|l|l|, width=(0.35 0.25 0.25) -->
<table class="tabular">
	<tr>
		<th>Control Name</th>
		<th>Triggers Callback</th>
		<th>Falls back to PostBack</th>
  </tr>
  <tr><td>
  		<a href="?page=ActiveControls.ActiveButton">TActiveButton</a>
  	</td>
  	<td>Yes</td>
  	<td>Yes</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.ActiveCheckBox">TActiveCheckBox</a>
  	</td>
  	<td>Yes</td>
  	<td>Yes</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.ActiveCustomValidator">TActiveCustomValidator</a>
  	</td>
  	<td>Yes</td>
  	<td>Yes</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.ActiveHyperLink">TActiveHyperLink</a>
  	</td>
  	<td>No</td><td>Yes</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.ActiveImage">TActiveImage</a>
  </td>
  <td>No</td><td>Yes</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.ActiveImageButton">TActiveImageButton</a>
	</td>
	<td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveLabel">TActiveLabel</a>
	</td>
	<td>No</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveLinkButton">TActiveLinkButton</a>
	</td>
	<td>Yes</td><td>No</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActivePanel">TActivePanel</a>
  </td>
  <td>No</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveRadioButton">TActiveRadioButton</a>
  </td>
  <td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveTextBox">TActiveTextBox</a>
	</td>
	<td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.CallbackOptions">TCallbackOptions</a>
	</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>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveDropDownList">TActiveDropDownList</a>
  </td>
  <td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveListBox">TActiveListBox</a>
  </td>
  <td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
  <a href="?page=ActiveControls.ActiveRadioButtonList">TActiveRadioButtonList</a>
  </td>
  <td>Yes</td><td>Yes</td>
  </tr>

  <tr><td>
	<a href="?page=ActiveControls.AutoComplete">TAutoComplete</a>
  </td>
  <td>Yes</td>
  <td>No</td>
  </tr>

  <tr><td>
	<a href="?page=ActiveControls.Callback">TCallback</a>
  </td>
  <td>Yes</td><td>No</td>
  </tr>

  <tr><td>
	<a href="?page=ActiveControls.EventTriggeredCallback">TEventTriggeredCallback</a>
  </td>
  <td>Yes</td><td>No</td>
  </tr>

 <tr><td>
	<a href="?page=ActiveControls.InPlaceTextBox">TInPlaceTextBox</a>
  </td>
  <td>Yes</td><td>No</td>
  </tr>

 <tr><td>
	<a href="?page=ActiveControls.TimeTriggeredCallback">TTimeTriggeredCallback</a>
	</td>
	<td>Yes</td><td>No</td>
  </tr>

  <tr><td>
	<a href="?page=ActiveControls.ValueTriggeredCallback">TValueTriggeredCallback</a>
	</td>
	<td>Yes</td><td>No</td>
  </tr>
  
  <tr><td>
  	<a href="?page=ActiveControls.DragDrop">TDropContainer</a>
  	</td>
  	<td>Yes</td><td>No</td>
  </tr>

  <tr><td>
  	<a href="?page=ActiveControls.DragDrop">TDraggable</a>
  	</td>
  	<td>No</td><td>No</td>
  </tr>

  
</table>

<h2 id="128036">Active Control Infrastructure Classes</h2>
<p id="640427" class="block-content">The following classes provide the basic infrastructure classes required to
realize the active controls.</p>
<ul id="u4" class="block-content">
	<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>

<div class="last-modified">$Id$</div></com:TContent>