Question

HELP on javascript
force function to use the value of variable and not the variable name

var a = 12;
var b = 13;

element.setAttribute("onChange","calculate('a','b')");

calculate(x,y){

z = x + y;
alert(z)

}

how to pass value of variable to be use in function?

Answer 1

HTML:

<input type="checkbox" name="cb" id="cb">​

JavaScript:

function calculate(x, y) {
    var z = x + y;
    alert(z);
}

var a = 12,
    b = 13,
    element = document.getElementById('cb');

element.onchange = function(e) {
    calculate(a, b);
};​

DEMO

Also consider the usage of element.addEventListener