Sum Values From 3 Text Fields

Feb 6, 2010

[code]
function updatesum() {
document.form1.totalfat.value = (document.form1.satfat.value -0) + (document.form1.monofat.value -0) + (document.form1.polyfat.value -0);
}[code]
[icode]
<body onload="updatesum()">
<form name="form1" method="post" action="./submitFood">
<table width="520" border="0"> .....

I like to sum the values from the "satfat", "monofat" and "polyfat" text field into "totalfat" textfield. The values in those 3 text field is retrieve from database. However, when it add up the 3 values, it will not be in decimal place instead it will be in 30.10000000000000000000000002. How do I solve it and how to go about editing the code.

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Code:
function addHazWaste() {
document.getElementById('HazardousWaste').value = 0;
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var HazWaste1 = 0;
var HazWaste2 = 0;
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HazWaste6 = parseInt(document.getElementById('BiohazardousWasteSentToLandfill').value,10);
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document.getElementById('HazardousWaste').value = HazWasteTotal;
}

If I run a separate function that just sets all form field values to zero (including the first line of this function). The summing works!!! Why won't it work the way I wrote it??? It won't work if I set the default value for the sum field to zero, either...

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