TreeNodeCheckChanged event of Treeview controls is not being fired.

Question

Hi All, I am using a treeview control. I am using it's TreeNodeCheckChanged event to perform some task, but it is not being fired. any idea what the problem could be.

Nilanka Dharmadasa · Answer

Hi Ali, The problem is changing the checkbox state does not cause a post back to the server. That's why it doesnot get fired. If you do a post back like, clicking a button after ticking the check box, then it will fire your event.

Lalit M · Answer

You can use this code body onload= "return window_onload()" > form id= "form1" runat= "server" > asp:TreeView ID= "TreeView1" runat= "server" OnTreeNodeCheckChanged= "TreeView1_TreeNodeCheckChanged" OnTreeNodeExpanded= "TreeView1_TreeNodeExpanded" ShowCheckBoxes= "All" OnTreeNodeDataBound= "TreeView1_TreeNodeDataBound" Width= "122px" > asp:TreeView > asp:Button ID= "Button1" runat= "server" Text= "Button" /> form > body > script language ="javascript" type ="text/javascript"> // function window_onload() { var inputs = document.getElementsByTagName( "input" ); for ( var i = 0 ; i { if (inputs[i].type == "checkbox" ) { inputs[i].onclick = mypostback; } } } function mypostback() { document.getElementById( 'Button1' ).click(); } // ]]> script > protected void TreeView1_TreeNodeExpanded( object sender, TreeNodeEventArgs e) { //break point here } protected void TreeView1_TreeNodeCheckChanged( object sender, TreeNodeEventArgs e) { //break point here } reference link