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copied!<p>What may be happening is that your <code>CheckBoxID</code> is wrong, and therefore returning the wrong element. </p> <p>In JavaScript, saying <code>checkbox.checked = false;</code> will, if this object did not previously have a <code>checked</code> property, <strong>add one</strong> to the object, with the value provided. So, if your <code>CheckBoxID</code> is in fact wrong, it's no surprise your alert shows false; any non-null element you pull back with <code>getElementById</code> will allow you to add a checked property to it.</p> <p>More specifically, in <code>asp.net</code> when you create a checkbox column, like this</p> <pre><code><asp:CheckBoxField Text="Hello" DataField="foo" /> </code></pre> <p>it renders html like this:</p> <pre><code><span class="aspNetDisabled"> <input id="gv_ctl00_0" type="checkbox" name="gv$ctl02$ctl00" disabled="disabled"> <label for="gv_ctl00_0">Hello</label> </span> </code></pre> <p>A couple possibilities: </p> <ol> <li>The id you're getting may be of the span, on which you're adding a checked property.</li> <li><strike>You're setting the checkbox to be checked, but since it's disabled, it's not updating its state</strike> -- ok, it looks like disabled checkboxes can have their checked properties updated. Hopefully #1 is your problem. </li> </ol> <p>A good place to start debugging would be to change your function to this</p> <pre><code>function UncheckedItemsCheckBox(CheckboxID) { var checkbox = document.getElementById(CheckboxID); alert(checkbox.checked); // <------- should display false, but will // display undefined if this element is // something other than a checkbox checkbox.checked = false; alert(checkbox.id + " : " + checkbox.name + " : " + checkbox.checked); } </code></pre>

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