Question

I have a simple input control :

<input type="text" min="0" max="100" value="0">

then I do a sum compute:

 var a=10;
 console.log(a+$('input').val());

however the result is ‘100’,not ’10’?!

why ?how can I get the correct answer?

Answer 1

The problem is that $('input').val() is a string, so a is converted to a string, and the + concatenates them. Try:

a + Number($('input').val())

This will convert the value of the textbox to a number, allowing the + to be the addition operator.