javascript calculation formula is not working

Question

I have following JavaScript function to make some calculation with textboxes but when I call this function on textbox the it doesn\'t works. Here is my JS code

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Answer 1

Your variables aren't numbers. They are strings, so addition just concatenates them together.

Cast them to integers:

var pkrusd = parseInt(document.getElementById('txtpkrusd').value, 10);

Or floats:

var pkrusd = parseFloat(document.getElementById('txtpkrusd').value);

Answer 2

Check your id's in the script. You need to use txtRatelb instead of txtratelb. They are case-sensitive.