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Newbie Here

Below is my script that runs each time a checkbox node is clicked within a treeview on a asp.net vb webpage. The Script works fine.

I would like for this same script to run each time a postback occurs on my page. I know that I believe that I need to use something like this:

VB
ScriptManager.RegisterStartupScript(Me, Page.GetType(), "scriptKey", "somefuncname();", True)


On my code behind . . . . but it does not seem to work

Any help is appreciated
Greg

JavaScript
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(document).ready(function () {
        $(function() {
            $("[id*=TreeView2] input[type=checkbox]").bind("click", function () {
                var table = $(this).closest("table");
                if (table.next().length > 0 && table.next()[0].tagName == "DIV") {
                    //Is Parent CheckBox
                    var childDiv = table.next();
                    var isChecked = $(this).is(":checked");
                    $("input[type=checkbox]", childDiv).each(function () {
                        if (isChecked) {
                            $(this).attr("checked", "checked");
                        } else {
                            $(this).removeAttr("checked");
                        }
                    });
                } else {
                    //Is Child CheckBox
                    var parentDIV = $(this).closest("DIV");
                    
                    if ($("input[type=checkbox]", parentDIV).length == $("input[type=checkbox]:checked", parentDIV).length) {
                                                $("input[type=checkbox]", parentDIV.prev()).attr("checked", "checked");
                        $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate", false);
                    } else {
                       if($("input[type=checkbox]:checked", parentDIV).length == 0) {
                                                     $("input[type=checkbox]", parentDIV.prev()).removeAttr("checked");
                           $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate", false);
                    }else{
                                                      $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate",true);
                    }
                    }
                }
        });
        })
    });
   </script>
Posted
Updated 7-Jul-14 8:08am
v4
Comments
Why you need this to work on each Post Back?
Member 10926423 7-Jul-14 15:04pm    
Due to the inability of the TreeView to correctly handle the OnCheckedChanged Event.

When a postback occurs on my page, the TreeView checkbox nodes lost the Indeterminate prop assignment.
Kornfeld Eliyahu Peter 7-Jul-14 16:50pm    
That's not a problem of the TreeView or OnCheckedChange - both work perfect.
It sounds you have some design problems around your code - debug post-back scenario and check what happening to TreeView then...
Why it is not working correctly? Have you debugged and see what is happening?

1 solution

Hi, I'm not sure if this is the problem you are facing but normally when you bind event handlers with jquery in a web forms application, the binding is lost during post-backs. If that is the case, you would need to use the "Sys.WebForms.PageRequestManager" object to rebind the events between post-backs. You should try something like this:

JavaScript
<script type="text/javascript">
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestAddress);

        function EndRequest(o, e) {
            bindHandlersAddress();
        }
		
        function bindHandlers() {
		//rebind controls and handlers:
		            $("[id*=TreeView2] input[type=checkbox]").bind("click", function () {
                var table = $(this).closest("table");
                if (table.next().length > 0 && table.next()[0].tagName == "DIV") {
                    //Is Parent CheckBox
                    var childDiv = table.next();
                    var isChecked = $(this).is(":checked");
                    $("input[type=checkbox]", childDiv).each(function () {
                        if (isChecked) {
                            $(this).attr("checked", "checked");
                        } else {
                            $(this).removeAttr("checked");
                        }
                    });
                } else {
                    //Is Child CheckBox
                    var parentDIV = $(this).closest("DIV");
                    
                    if ($("input[type=checkbox]", parentDIV).length == $("input[type=checkbox]:checked", parentDIV).length) {
                                                $("input[type=checkbox]", parentDIV.prev()).attr("checked", "checked");
                        $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate", false);
                    } else {
                       if($("input[type=checkbox]:checked", parentDIV).length == 0) {
                                                     $("input[type=checkbox]", parentDIV.prev()).removeAttr("checked");
                           $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate", false);
                    }else{
                                                      $("input[type=checkbox]", parentDIV.prev()).prop("indeterminate",true);
                    }
                    }
                }
        });
        }

        $(document).ready(function () {
            bindHandlers();
        });
    </script>
 
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