Create A Small Function To Expand A Textarea?

Nov 5, 2009

I'm trying to create a small function to expand a textarea when they hit a certain amount of characters.

My textarea is at a certain width and it takes 39 characters to hit the end. At 39 characters I would like the textarea to expand an additional row.

This is what I created:

Code JavaScript:
function boxGrow(control) {
var len = control.value.length;
if (len > 39) {

[Code]....

The problem is that after I hit 39 it keeps expanding by 1 row every extra character even though I set "len" back to zero.

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