Erase value if checkbox is checked
<p>I would like the following:</p>

<pre><code>Data = "123";
if checkbox clicked {Data="";}
</code></pre>

<p>Submit-button</p>

<hr>

<p>That was the best way I could explain it.</p>

<p>I have tried, but I can't get the checkbox to overwrite the data with an empty value.</p>
