Javascript Adding Two Decimal Places

Question

This is my Code so far. I want to know how to return the answer with two decimal places. EX. Instead of 515.3 I want 515.30 or instead of 500 I want it to return 500.00.

<HTML>
<HEAD>
<TITLE>Simple Adder</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function CalculateSum(Atext, form)
{
var A = parseFloat(Atext);
form.Answer.value = A * .03+.30+A;
}
function ClearForm(form)
{
form.input_A.value = "";
form.Answer.value = "";
}

// end of JavaScript functions -->
</SCRIPT>
</HEAD>

<BODY>

<P><FONT SIZE="+2">Credit Card Payment Calculator</FONT></P>

<FORM NAME="Calculator" METHOD="post">
<P>Enter Base Rent: <INPUT TYPE=TEXT NAME="input_A" SIZE=10></P>
<P><INPUT TYPE="button" VALUE="Calculate Rent & Fees Payment" name="AddButton"              onClick="CalculateSum(this.form.input_A.value, this.form)"></P>
<P><INPUT TYPE="button" VALUE="Clear Fields" name="ClearButton"    onClick="ClearForm(this.form)"></P>
<P>Final Amount = <INPUT TYPE=TEXT NAME="Answer" SIZE=12></P>
</FORM>

</BODY>
</HTML>

Javascript is not the same as Java. I've edited your post to reflect this. — Jon Skeet
– Jon Skeet, Commented Nov 10, 2011 at 16:40
Jon Skeet has edited your question, consider yourself lucky! — DJ22T
– DJ22T, Commented Jun 16, 2014 at 21:13

Alex Turpin · Accepted Answer · 2011-11-10 16:41:43Z

14

Use Number.prototype.toFixed. For example:

var a = 515.3;
alert(a.toFixed(2));

Note that this converts the number to a string so only use it to display to the user.

answered Nov 10, 2011 at 16:41

Alex Turpin

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2 Comments

Aaron Coronado Over a year ago

Thank you. It helped me out eventually. =) I'm still new to this.

Alex Turpin Over a year ago

No problem. Remember @JonSkeet's advice when looking up JavaScript stuff. Java is not the same language as JavaScript.

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