Asp.net Web Form Error : Invalid postback or callback argument

Question

<script type="text/javascript">
    var s = false;
    $(document).ready(function () {
        $("#btnSaveEducation").click(function () {
            s = true;
        });

        window.onload = function () {

            if (s == false) {
                var select = document.getElementById("year");
                for (var i = 2011; i >= 1900; --i) {
                    var option = document.createElement('option');
                    option.text = option.value = i;
                    select.add(option, 0);
                }
            }
        };
    });
</script>

....
...
<body>
 <asp:DropDownList ID="year" runat="server" name="year">
                        </asp:DropDownList>
</body>
....
..

Hello. In Asp.Net Web From, I get this error when I click btnSaveEducation :

[Invalid postback or callback argument.  Event validation is enabled using 
<pages enableEventValidation="true"/> in configuration or 
<%@ Page EnableEventValidation="true" %> in a page.  
 For security purposes, this feature verifies that arguments to postback 
 or callback events originate from the server control that originally 
 rendered them.  If the data is valid and expected, use the
 ClientScriptManager.RegisterForEventValidation method in order to 
 register the postback or callback data for validation.]

Why ? Thanks.

score 2 · Accepted Answer · edited May 23 '17 at 10:26

2

Dy default you can't add option in dropdown list from jquery or java-script.

Because Asp.net checks each controls after postback.

You can change the page directive as follow

<%@ Page ... EnableEventValidation="false" %>

which will cause no validation on the server side which is not good thing.

If you want to achieve the above you can use html drop down and use a hidden field and get the selected value from hidden field rather than drop down it will work.

Similar question on SO

asp.net: Invalid postback or callback argument

edited May 23 '17 at 10:26

Community

1
1

answered Mar 26 '14 at 12:00

शेखर

17,412
13
61
117

When I click F5 in Visual Studio, everything is good. In dropdownlist there are years. When I refresh page , again everything is good. But when I click button I get this error. – Jeyhun Mar 26 '14 at 12:05
I have done it. Already there is not error. But what do you think? Can it be cause aother proplem for adding "EnableEventValidation="false" property for other elements? – Jeyhun Mar 26 '14 at 12:10

score 0 · Answer 2 · answered May 14 '14 at 20:46

0

Just put this code on your aspx file:

if you already have something like <%@ Page ... EnableEventValidation="false" %>

answered May 14 '14 at 20:46

Alexandre Nascimento

21
3

Asp.net Web Form Error : Invalid postback or callback argument

2 Answers2