1+100=1100 in JavaScript

Question

It always combines two numbers as two strings, despite I've used the parseInt() function. How can I fix the problem?

Here's the code
#There's something above
var a=document.getElementById("a");
var b=document.getElementById("b");
parseInt(a);
parseInt(b);
document.write(a+b);
#There's something below

Answer 1

This is my trick, multiply each variable by 1 so as to convert them to integer.

Answer 2

What want you retrieve from what type of html element? A value from an attribute ( ie: <input>... ), the text content ( ie: <option>... ), the Html text content? Because actually, even if you parseInt() correctly your variables, you cannot obtain a correct result/behaviour: The function 'getElementById' return an object "HtmlElement' which will be converted to 'NaN' value by parseInt()...

Answer 3

parseInt(var1) + parseInt(var2)

Answer 4

visph
It's a value of input, I just forgot to type .value when I copied my code to here.

Answer 5

Thanks for your reply.