Grey out submit button on html form until text is inserted

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How to grey out the submit button on a HTML form until a text is inserted:

Insert the following into the <head>-section of your page:

<script type = "text/javascript">
function check() {
var filled = 0
var x = document.form1.title.value;
x = x.replace(/^\s+/,""); // strip leading spaces
if (x.length > 0) {filled ++}
if (filled == 1) {
document.getElementById("submitForm").disabled = false;
}
else
{
document.getElementById("submitForm").disabled = true
}
}
</script>

and the following into your <html>-section:

<form name="form1" action="http://www.theitcommunity.com/" method="get" />
<input type="text" id="title" name="search" value="" onkeyup = "check()" />
<input type="submit" value="submit" id="submitForm" disabled="disabled" />
</form>

and you are done, as soon as one character (other than a space) is entered the text field, the submit button becomes active.



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