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Set Virtual dropdown field to blank on window load


anibaldps
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I have a Virtual field which is a cascading dropdown field in a details page. I would like to set the value to NULL when the page loads. I have the following code that is NOT working for me.

<SCRIPT>

function block()
{
document.getElementById("cbParamVirtual1").value="";
}

window.onload=block;
</SCRIPT>

Can anybody please help me with this, what is wrong with this code?

Sincerelly,

Anibal

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