I have a form with 7 text fields used for entering dollar values. Is there a way that I can call on javascript to keep a running total in the subtotal field as I enter numbers in the other text boxes? I am very new to Javascript, and am not certain how to to this. Any help would be grately appreciated. Thanks.
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adding text fields
- Thread starter mortkc
- Start date
Here's a small working example, I'd use onblur or something similar:
-kaht
Code:
<html>
<head>
<title>Blah</title>
<script language=JavaScript>
function updateSum() {
sum = 0;
for(i = 0;i < 4;i++) {
num = document.getElementById("text" + i).value;
num = (num.length == 0) ? 0 : num;
sum += parseInt(num, 10);
}
blahForm.sum.value = sum;
}
</script>
</head>
<body>
<form name=blahForm>
<input type=text id=text0 onblur='updateSum()'>Value 1<br>
<input type=text id=text1 onblur='updateSum()'>Value 2<br>
<input type=text id=text2 onblur='updateSum()'>Value 3<br>
<input type=text id=text3 onblur='updateSum()'>Value 4<br><br>
<input type=text name=sum>Sum
</form>
</body>
</html>-kaht
- Thread starter
- #3
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