Prevent Dropdown With Previous Input

Jun 17, 2007

When you press the down key while in an input field the default
behavior for some event creates a dropdown of the previously input
text. What event creates that behavior and how do I stop it ?

For example, to prevent ANY type of default behavior when clicking ANY
key, I thought this would work, but the dropdown still occurs. What am
I doing wrong ?

In html file:<body >
Search Text: <input type='text' id='searchtext' />

in javascript file:
function blank(){
return false;
}
function registersearch(){

document.getElementById("searchtext").
document.getElementById("searchtext").
document.getElementById("searchtext").
document.getElementById("searchtext").

}

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<tr> <td class='caption'>
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<div id="1"> <tr>
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