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How to pass values from one field to other fields using Javascript

One of the big questions people have is how they can pass values from fields to others fields.

Take a look this sample. Field C = A X B. User want to get result C automatically.

X =

Here is the code:

<script language="JavaScript">

function calculate()
{
A1 = document.catalog_form.a1.value
B1 = document.catalog_form.b1.value
C1 = (A1*B1)
document.catalog_form.c1.value = C1
}
</script>

<html>
<body>

<form name="catalog_form">
<input type="text" name="a1">
X
<input type="text" name="b1" onChange=calculate();>
=
<input type="text" name="c1" >
</form>
</body>
</html>
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