Passing Server Side Control to Client Side Script

Hi All,

I have an asp:DropDownList and an asp:TextBox on my form. I want to disable or enable the textbox depending on the selection in the dropdown. I am using master pages and the problem is that when I use the onChange event for the dropdown on the client side, I don't know the ID of the the textbox on the client side to disable or enable it.

 How can something like this be done?


4/13/2009 4:46:52 PM 24353 articles. 1 followers. Follow

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You can use the ClientID property of a control to determine the ID, something like:


<script type="text/javascript">
    function ShowMeTheID(){
        alert('<%= DropDownList1.ClientID %>');

Hope that helps.


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4/13/2009 4:57:52 PM

Like this?

<asp:DropDownList id="DropDownList1" onchange="dropDownList1OnChange(this);" runat="server">
 <asp:listitem value="">Select one</asp:listitem>
 <asp:listitem value="1">Item 1</asp:listitem>
 <asp:listitem value="2">Item 2</asp:listitem>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<script type="text/javascript">
function dropDownList1OnChange(elementRef)
 var textBoxRef = document.getElementById('<%= TextBox1.ClientID %>');
 // Or:
 //var textBoxRef = document.getElementById('<%= (Page.Master.FindControl("TextBox1")).ClientID %>');

 // Disable if "Item 1" is selected in the DropDownList,
 // Enable otherwise...
 textBoxRef.disabled = (elementRef.value == '1') ? true : false;
// -->

Note that I attached the event handler to the element in the HTML declaration. This will work, but will produce a compiler warning. The proper way to do this for a server control is in the Page_Load handler of the server-side code like this:
 DropDownList1.Attributes.Add("onchange", "dropDownList1OnChange(this);");


4/13/2009 6:33:35 PM

That was perfect. Works beautifuly. Thank you so much for your help.

4/14/2009 3:26:00 AM

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