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Written By:-Isha Malhotra
Email:-malhotra.isha3388@gmail.com
Basic of AJAX
Ajax is a platform independent technology. AJAX stands for Asynchronous JAvascript and Xml.
Asynchronous refers to the events that are happening in the background
Independently from the main application flow.
With the help of Ajax we can create an area in our web form
Which post back and update without refreshing the whole page. It is called
Partial page updating which increases the performance.
Ajax Controls
1.
ScriptManager
2.
ScriptManagerProxy
3.
Update Panel
4.
Timer Control
5.
Update Progress
Script
Manager
Script manager is used to control the processing of Ajax.
The major responsibility of script manager is for downloading Microsoft Ajax
Library down to the browser (client).
Script manager’s EnablePartialRendering property must be set
True which is its default value which is necessary for the script manager to manage
Partial updating.
Update
Panel
Update panal control is just like a container for other
control. It defines an area in your page which will be independently partially
post back without refreshing the whole page. A single page can have multiple
update panel.
Example
In the following example
we add one script manager and update panel at our page. In update panel we take
one dropdown list and filled it with some countries and there is a lable in
update panel too. We create event dropdown SelectedIndexChanged.
In this event we take the dropdown selected item and show it in the lable.
Check the following code:-
