How Do I Populate The Cascading Drop Down List Using Ajax And Jquery

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I take the coding reference http://www.aspsnippets.com/Articles/AJAX-Cascading-DropDownList-using-jQuery-in-ASP.Net.aspx.Net.aspx">http://www.aspsnippets.com/Articles/AJAX-Cascading-DropDownList-using-jQuery-in-ASP.Net.aspx[^]

The modify the code as below

XML

<script type = "text/javascript">
    var pageUrl = '<%=ResolveUrl("~/vendor_master.aspx")%>'
    function PopulateStates() {
        if ($('#<%=ddl_state.ClientID%>').val() == "0") {
            $('#<%=ddl_city.ClientID %>').empty().append('<option selected="selected" value="0">Please select</option>');
        }
        else {
            $('#<%=ddl_city.ClientID %>').empty().append('<option selected="selected" value="0">Please select</option>');
            $.ajax({
                type: "POST",
                url: 'vendor_master.aspx/PopulateCities',
                data: '{stateID: ' + $('#<%=ddl_state.ClientID%>').val() + '}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: OnCitiesPopulated,
                failure: function (response) {
                    alert(response.d);
                }
            });
        }
    }
    function OnCitiesPopulated(response) {
        PopulateControl(response.d, $('#<%=ddl_city.ClientID %>'));
    }
</script>

But it gives me an error

VB

ReferenceError: PopulateControl is not defined


PopulateControl(response.d, $('#ddl_city'));

please help me to solve the error

Posted 29-Jan-15 21:46pm

Omkar Hendre

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Comments

jaket-cp 30-Jan-15 4:24am

Did you read the "Populating the DropDownLists with data" part
and put in the PopulateControl function ?

Omkar Hendre 30-Jan-15 4:38am

Thanks friend i got it n sorry for giving trouble you sorry dear

1 solution

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2015-01-29T23:39:00

That is because you have not defined that function. As per the link you have given, it is...

HTML

<script type = "text/javascript">
function PopulateControl(list, control) {
    if (list.length > 0) {
        control.removeAttr("disabled");
        control.empty().append('<option selected="selected" value="0">Please select</option>');
        $.each(list, function() {
            control.append($("<option></option>").val(this['Value']).html(this['Text']));
        });
    }
    else {
        control.empty().append('<option selected="selected" value="0">Not available<option>');
    }
}
</script>