Converting Function That Repeats Many Times...

Feb 26, 2007

I have a function that I use to prevent users from entering anything but numbers in fields. This function works perfectly but it repeats many times in my code like this:

<input name="txtInput1" type="text" id="txtInput1" size="4" maxlength="4" tabindex="1">
<script type="text/javascript">
document.getElementById('txtInput1').onkeyup = function () {
this.value = this.value.replace(/D/g,'');
}
</script>

So if I have 30 input fields, this function repeats 30 times... which doesn't make sense. I started to convert it to a global function that will be written only once within the <head> and each input field will call the function. This is what I tried:

In the head:
<script type="text/javascript">
function functionNumbers() {
this.value = this.value.replace(/D/g,'');
}
</script>

The input field:

<input type="text" name="Tuition" size="15" tabindex="32" onkeyup="functionNumbers(Tuition)">

It doesn't work. I tried 2 or 3 different ways such as 'Tuition' with the single quotes etc. There's obviously something I'm not getting.

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