Active Controls (AJAX enabled Controls)
See the Introduction
for a quick overview of the concept behind active controls (AJAX enabled controls).
Most active controls have a property of
ActiveControl and
a sub-property ClientSide
that provides many properties to customize the controls. The
CallbackClient property of the
TPage class provides many methods to update and alter the client-side content
during a callback request. Active controls is reliant on a collection
of javascript classes.
For a quick demo of active controls, try the
TActiveButton control. See also the later part of the Current Converter tutorial for a more indepth example.
* the tutorial for this control is not completed yet.
Standard Active Controls
-
TActiveButton
represents a click button on a Web page. It can be used to trigger a callback request.
-
TActiveCheckBox
represents a checkbox on a Web page. It can be used to collect two-state user input
and can trigger a callback request.
-
TActiveCustomValidator
validates a particular control using a callback request.
-
TActiveHyperLink
represents a hyperlink on a Web page.
-
* TActiveImage
represents an image on a Web page.
-
* TActiveImageButton
represents a click button that has an image as the background.
It is can be used to trigger a callback request.
-
* TActiveLabel
represents a label on a Web page.
The label can be customized via various CSS attributes.
-
* TActiveLinkButton
represents a hyperlink that can perform a callback request.
-
* TActivePanel
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.
-
* TActiveRadioButton
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.
-
* TActiveTextBox
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.
-
* TCallbackOptions
callback options such as OnLoading client-side event handlers.
Active List Controls
-
* TActiveCheckBoxList
displays a list of checkboxes on a Web page and each checkbox
can trigger a callback request.
-
* TActiveDropDownList
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.
-
* TActiveListBox
displays a list box that allows single or multiple selection. It can be used
to perform a callback request.
-
* TActiveRadioButtonList
is similar to TActiveCheckBoxList in every aspect except that each
TActiveRadioButtonList displays a group of radiobuttons. Each radio button
can perform a callback request.
Extended Active Controls
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* TAutoComplete
extends TActiveTextBox to offer text completion suggestions.
-
* TCallback
a generic control that can perform callback requests.
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* TEventTriggeredCallback
triggers a callback request based on HTML DOM events.
-
* TInPlaceTextBox
represents a label that can be edited by clicked.
-
* TTimeTriggeredCallback
triggers a callback request based on time elapsed.
-
* TValueTriggeredCallback
monitors (using a timer) an attribute of an HTML element and triggers a callback request
when the attribute value changes.
Active Control Abilities
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.
Active Control Infrastructure Classes
The following classes provide the basic infrastructure classes required to
realize the active controls.
-
* TActiveControlAdapter
tracks the viewstate values of the control and update differences of the client-side HTML
element attributes.
-
* TActiveListControlAdapter
allows the adapted list controls to change the selections on the client-side during
a callback request.
-
* TActivePageAdapter
process the page life-cycle for callback requests.
-
* TBaseActiveControl
common active control methods and options.
-
* TCallbackClientScript
methods to manipulate the client-side HTML elements, also includes methods
to invoke javascript Effects on HTML elements.
-
* TCallbackClientSide
common client-side callback request options, and client-side event handlers.
-
* TCallbackResponseAdapter
HTTP response for callback requests.
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