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Invalid JSON Primitive

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Mike
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Mike asked on 09 Jun 2008, 12:51 AM
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

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Simon
Telerik team
answered on 11 Jun 2008, 01:05 PM
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
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Mike
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answered on 16 Jun 2008, 07:41 AM
Hi Simon,

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

Mike
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Ben Hobgood
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answered on 12 Nov 2020, 05:50 PM

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);

}

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Vessy
Telerik team
answered on 13 Nov 2020, 07:11 AM

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
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Simon
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Mike
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