Question

I’ve got this textBox which triggers off an ajax request using jQuery:

<asp:TextBox ID='postcodeTextBox' runat='server' Text='<%# Bind('POSTAL_ZIP_CODE') %>'>  $(document).ready(PageLoad);  function PageLoad() {     $(container + 'parentProjectTextBox').change(GetProjectName); }  function GetProjectName() {     var projectNumber = $(this).val();     if (projectNumber == '') return;     $(container + 'parentProjectPanel').block({ message: '<img src='../Resources/RadControls/Ajax/Skins/Default/loading7.gif' />' });     $.ajax({         type: 'POST',         url: projectMasterWebServicesUrl + 'GetProjectName',         data: '{'projectNumber':'' + projectNumber + ''}',         contentType: 'application/json; charset=utf-8',         dataType: 'json',         success: GetProjectNameOnSuccess,         error: GetProjectNameOnError     }); } 

This ajax request gets a list to populate this dropdown:

                        <asp:DropDownList ID='cityDropDownList' runat='server' OnDataBound='cityDropDownList_DataBound'>                             <asp:ListItem Text='...Select...' Value='0'>                             </asp:ListItem>                         </asp:DropDownList> 

Everything works fine. The only problem I’m having is that when I update my formView priod to saving that record I can’t see the value that was set to that dropdown. As I’m populating this dropdown in the client side I supose ASP.NET loses track of that ….

Does anyone have any insights?

Apparently when I switch on/off the EnableEventValidation property for that page I sometimes get the correct value…..

Thanks !

Answer 1

You should create a hidden field store that value. Update that HiddenField in your Javascript and then read it on the server side. Also, if you have EventValidation=true and you change the items in the dropdown list you will get well known exceptions.