Let's say I have some numbers that I want to multiply and add.

var a = 5;
var b = 10;
var c = 2;
var d = 3;

I want to sum b and c then multiply that by a, then add d. Easy right?

If if were a normal equation the formula would look like: (a * (b + c) + d)

But how do I do that in JQuery?

(Note: the reason for JQuery is that I'll be getting these numbers from fields and divs... and placing a total elsewhere, etc.)

Let's say I have some numbers that I want to multiply and add.

var a = 5;
var b = 10;
var c = 2;
var d = 3;

I want to sum b and c then multiply that by a, then add d. Easy right?

If if were a normal equation the formula would look like: (a * (b + c) + d)

But how do I do that in JQuery?

(Note: the reason for JQuery is that I'll be getting these numbers from fields and divs... and placing a total elsewhere, etc.)

• javascript
• jquery

• 1 jQuery is 100% Javascript. You can use this as usual after getting your values via the element selectors. - Please specify your question further if you need more help. – Smamatti Commented Nov 7, 2011 at 11:24

5 Answers 5

By default script language does not know type as int or float. So you can fix that by multiplying 1 to the value you expect to be a number.

var a = 5;
var b = 10;
var c = 2;
var d = 3; 

var total = a*1 * (b*1 + c*1) + d*1;

convert your value into float or integer first before you do calculation. Example:

var a = parseFloat($(this).val());
var b = parseInt($("#b").attr("data"));

var c = (a+10)*b;
$("#result").text(c.toFixed(2));

Just store the values in variables before you apply them to the equation:

var a = +$("#input1")[0].value;
var b = +$("#input2")[0].value;
var c = +$("#input3")[0].value;
var d = +$("#input4")[0].value;

$("#output")[0].value = a*(b+c) + d;

The plus sign before the jquery function is there to force the string value into a Number value.

Correct JQuery is 100% javascript.

Although, worth mentioning just use parseint() for the values that you get from text field

You can still do the calculation using normal javascript, just refer to the contents using jQuery selectors if necessary.