CheckBox List losing the checkbox checked after post back

Question

Hi I have check box list and a check box After binding the data to the checkbox if we select the all checkboxes then the main checkbox gets selected its fine till now but when we unselect any check box in checkbox list and clicks a button then all checkboxes in the checkboxlist getting unchecked. How to Hold the checked items of the checkbox list even after the post back. Javascript code function pageLoad(sender args) { CheckAllProject(); } function CheckAllProject () { $([id*=lbxProjectList]).focus(function () { if ($([id*=lbxProjectList] input:checked).length == $([id*=lbxProjectList] input).length) { $([id*=CheckBox1]).attr(checked checked); } else { $([id*=CheckBox1]).removeAttr(checked); } }); } It Looks like in the following way Project List:CheckBox Select All Projects Checkbox 1 Project1 Checkbox 2 Project2 Button Submit

Jaganathan Bantheswaran · Answer

Updated jsfiddle http://jsfiddle.net/Jaganathan/CfcxL/34/

Santosh Kumar · Answer

@Jaganathan Thanks for the reply again In the below link http://jsfiddle.net/Jaganathan/CfcxL/33/ the event is firing on button click but for me the after all checkboxes are select then main checkbox need to be checked how i can add the event for the checkbox list which checks all the check boxes got selected.

Jaganathan Bantheswaran · Answer

You can do something like this http://jsfiddle.net/Jaganathan/CfcxL/33/

Santosh Kumar · Answer

@Jaganathan Thanks for the reply here if i comment the that javascript code i am able get the values so no need of session or hidden field. please suggest me any other way to achieve to check the main check box if all the other checkboxes gets selected. Is there any way to add the onclick event to the asp.net checkbox list instead of calling event in pageload event in javascript. Here is my asp code of the check box list

Jaganathan Bantheswaran · Answer

Hi You can do something like to add a hidden field/session to the page that represents the state of the checkbox then update the field's value to ON or OFF for example whenever the checkbox is clicked. Or else handle the click event on click side and do ajax call to server to updated something.