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POCan't access User-Control via javascript on the outer Page
 

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  1. POCan't access User-Control via javascript on the outer Page
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    <p>I developed my user-control with a <code>label</code> and a <code>textbox</code> (both of them are from <code>DevExpress</code>). I have a page with some controls including mine and javascript block. I realize that I must use <code>document.getElementById("&lt;%=tbPosition.ClientID %&gt;")</code> to get access for user-control. But <code>document.getElementById("&lt;%=tbPosition.ClientID %&gt;")</code> returns null.</p> <p>Here's my code: 1) <code>Page.aspx</code> with user control</p> <pre><code>&lt;script type="text/javascript" language="javascript"&gt; var tb = document.getElementById("&lt;%=tbPosition.ClientID %&gt;"); // returns null &lt;/script&gt; &lt;head&gt;&lt;/head&gt; &lt;body&gt; &lt;rsoft:TextBoxControl ID="tbPosition" runat="server" Title="Позиция" IsRequired="true" ValidationMode="UnsignedInt" ClientIDMode="Static" /&gt; &lt;/body&gt; </code></pre> <p>2) User-control 'rsoft:TextBoxControl'</p> <pre><code>&lt;table&gt; &lt;tr&gt; &lt;td class="styleFieldLabel"&gt; &lt;asp:Label ID="lblTitle" Text="" runat="server" Font-Bold="True" /&gt; &amp;nbsp; &lt;/td&gt; &lt;td class="styleFieldInput"&gt; &lt;dx:ASPxTextBox ID="tbValue" runat="server" Width="500px" ClientIDMode="Static" ClientInstanceName="tbValue"&gt; &lt;ClientSideEvents TextChanged="tbValue_TextChanged" /&gt; &lt;ValidationSettings SetFocusOnError="True" Display="Dynamic" RequiredField-ErrorText="Поле обязательно для заполнения" ErrorTextPosition="Bottom" ValidateOnLeave="false" /&gt; &lt;/dx:ASPxTextBox&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre> <p></p> <p>Does anybody know why <code>document.getElementById("&lt;%=tbPosition.TextBoxClientID %&gt;")</code> turns into <code>document.getElementById("tbPosition_tbValue")</code>, but there's an html element "tbPosition_tbValue_I" not "tbPosition_tbValue"? It occurs when i'm using DevExpress controls inside my user-control. When my control doesn't contain devexpress but usual <code>&lt;Asp:Textbox&gt;</code> I don't have this problem.</p>
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    1. COhave you checked the javascript rendered to the client to see what `tbPostition.ClientID` actually gives you? If it's your own user control, it may well be null.
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      1. USGraham Clark
    2. COI checked rendered javascript. document.getElementById("<%=tbPosition.ClientID %>") TRANSFORMED TO document.getElementById("tbPosition"); As you can see, it's the same as usercontrol Server Id 'tbPosition', no prefix and postfix. What can it be?
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      1. USSasha
    3. COok, but if you check the HTML on the client side, is there actually an HTML element with an ID of `tbPosition`?
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      1. USGraham Clark
 

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