Programmed AJAX

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Help / WLanguage / WLanguage functions / Web-specific functions / AJAX functions

Overview
AJAX functions
Procedures that can be called by AJAX
WLanguage functions useless in AJAX

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Programmed AJAX

Overview

The diagram below presents the use of "programmed AJAX" in a WEBDEV website:


	Execution of a process on the browser side (AJAXExecute or AJAXExecuteAsynchronous).
	Request to execute a procedure on the server side.
	Execute server procedure.
	Generation of the result. The result of the procedure will be expressed as a character string or an XML document.
	Sending of the procedure result (RETURN keyword).
	Analysis of the procedure result.
	Refresh modified data. Only the necessary controls are refreshed.

AJAX functions

Several AJAX functions can be used to manage the complex processes:


AJAXAsynchronousCallPending	Determines if a server procedure called by AJAXExecuteAsynchronous is being executed.
AJAXAvailable	Used to find out whether the AJAX technology is supported by the current browser.
AJAXCancelAsynchronousCall	Cancels the automatic execution of browser procedure called by AJAXExecuteAsynchronous.
AJAXExecute	Runs a server procedure without refreshing the page. This function is blocking. No process will be run as long as the procedure result run is not retrieved.
AJAXExecuteAsynchronous	Runs a server procedure without refreshing the page. This function is not locking. The other processes continue to run (no matter whether the result of the procedure run is retrieved or not).

These functions allow you to run a server procedure from a browser process.

Attention It is necessary to ensure consistency between information stored on the server and that displayed on the user's computer. For example, if data is modified, this data must be modified both on the server and on the page displayed in the browser.

Procedures that can be called by AJAX

To secure the WEBDEV websites, the server procedures are protected from illegal calls (attempt to re-route a session for example). To run a server procedure from a browser process (AJAXExecute or AJAXExecuteAsynchronous), you must allow this procedure to be called by AJAX.

To allow a server procedure to be called by AJAX, click the "AJAX" word in the procedure bar:

Procedure that cannot be called by AJAX

Procedure that can be called by AJAX

WLanguage functions useless in AJAX

All the functions available in WEBDEV server can be used in AJAX. However, the folllowing functions are useless in AJAX. Therefore, these functions are not available in AJAX.


ContextClose	Closes a page context
ContextOpen	Opens a new page context without returning the information to the browser.
FileDisplay	Displays a file in the user's browser.
FramesetDisplay	Displays a WEBDEV frameset in the user's browser.
FramesetRefresh	Refreshes a frameset displayed in the user's browser from the context on the server.
FramesetUse	Displays a WEBDEV frameset in the browser of the Web user and closes all the current page and frameset contexts.
InitWindow	Resets (or not) the controls found in the current page and runs the initialization processes of controls.
PageInitialization	Resets (or not) the controls found in the current page and runs the initialization processes of controls.
PageUse	Displays a WEBDEV page in the browser of the Web user and closes all the current page contexts.
ScriptDisplay	Calls an external script (.php, .asp, .mhtml or .mht) and returns the result page in the current browser window.
StringDisplay	Displays a character string (or a buffer) in the browser.
UploadCopyFile	Saves on the server a file "uploaded" by the Web user.
UploadFileName	Returns the name of a file "uploaded" by the Web user.
Use	Displays a page in the browser of Web user.

This list can evolve. It is recommended to check the documentation for each function. The

logo indicates whether the function is available in AJAX.