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    <p>In the <code>Repeater</code> you used databinding syntax (<code>&lt;%# ... %&gt;</code>), but that doesn't apply in this case. You <em>should</em> be able to set the attribute like this:</p> <pre><code>data-valmsg-for='&lt;%= TextBox1.ClientID %&gt;' </code></pre> <p>Why are you adding custom attributes to the validators in the first place though, if you don't mind me asking? What purpose does it serve that can't be achieved through other means?</p> <p><strong>EDIT</strong></p> <p>Have you considered building your list of control IDs in code-behind beforehand, and storing it somewhere? Could something like this be a starting point?:</p> <pre><code>var controlList = Page.Validators.OfType&lt;BaseValidator&gt;() .Select(v =&gt; Page.FindControl(v.ControlToValidate).ClientID).ToList(); </code></pre> <p><strong>EDIT</strong></p> <p>Expanding on that idea, you can serialize the list to JSON using the <code>JavaScriptSerializer</code> (<code>System.Web.Script.Serialization</code>):</p> <pre><code>//initialize the javascript serializer var serializer = new JavaScriptSerializer(); //retrieve all of the validators on the page and store the client ids in a list var controlList = Page.Validators.OfType&lt;BaseValidator&gt;() .Select(v =&gt; Page.FindControl(v.ControlToValidate).ClientID).ToList(); //serialize the control id list and register the script block on the page Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "data", string.Format("var data = {0}", serializer.Serialize(controlList)), true); </code></pre> <p>Depending on how complex the form is, you may need to create a recursive function to find all of the controls, but hopefully this demonstrates the concept.</p>
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    1. POHow can I use Client ID within a server control?
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    1. USJames Johnson
    1. USJames Johnson
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    1. COUsing that method will render the tag as plain text. It's a long story but the reason I'm doing this is because I am presenting a very customized validation UI that includes a summary with links that take the user to the control, along with tooltips that display the error message. I use the data-valmsg-for attributes to scan over the errors and build my custom display.
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      1. USMike
    2. COHow is it rendered in the code example above? Shouldn't that output the `ClientID` in the `data-valmsg-for` attribute too?
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      1. USJames Johnson
    3. COIt just renders as plain text: <span id="ctl00_ContentPlaceHolder1_reqLoss" data-valmsg-for="<%= drplstLoss.ClientID %>" style="color:Red;display:none;">Loss is required.</span>
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