Invalid JSON Primitive

[Mike]

Hello,

I am trying to refresh a treeview when I close a rad window... to do that, I've tried using this code in the onclose event:

        function RefreshTree() {
            __doPostBack('treeStructure', 'RefreshTreeStructure');
        }

In the .vb file I've got this...

    Protected Sub treeStructure_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles treeStructure.Load
        'If Me.IsPostBack Then
        '    Dim eventArg As String = Request("__EVENTARGUMENT")
        '    If eventArg = "RefreshTreeStructure" Then
        '        FillStructureTree(Me.cboSection.SelectedValue)
        '    End If
        'End If
    End Sub

the items are commented out as a part of me playing around with things - commented or not, I am getting this error:

Invalid JSON Primitive: RefreshTreeStructure

I am using context menus in the treeview and have a RadAjaxManager on the page that is controlling the treeview as well.

Any thoughts?

Thanks,

Mike

[Simon]

Hi Mike,

I suggest you replace the first argument of the __doPostBack function with an empty string ("") if you do not need it on the server. In case you need it, I suggest you replace it with another identifier for the TreeView, different from its ID, like 'rt1' for example.

The problem is caused by this first argument: the TreeView on the page recognizes this postback as directed to it (from the first argument) and tries to parse the second argument which produces the error.

Sincerely yours,
Simon
the Telerik team

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[Mike]

Hi Simon,

Sorry for the delay in responding - thank you... looks great.

Mike

[Ben Hobgood]

This post is old but we solved it by clearing the divs you load via ajax before postback, thought I'd share:

 

//rewrite the __doPostBack calls so that we can clear the ajax content 
//this prevents JSON primitive error on postback
$('a[href*="__doPostBack"]').each(function () {
  this.href = 'javascript:ClearAjax(); ' + this.href.replace('javascript:', '');
});
$('input[onclick*="__doPostBack"]').each(function () {
  this.onclick = 'ClearAjax(\'...\'); ' + this.onclick;
});

//clear or write simple content to div where content was written to by ajax call
function ClearAjax(content){

  $('div-ajax-content').html(content);

}

[Vessy]

Hi,

Thanks a lot for sharing your solution with the community, Ben! I am sure it will be helpful for the other developers facing the same problem.

Regards,
Vessy
Progress Telerik