HTML5 APIs - JavaScript: Novice to Ninja - page 487

function factorize(event) {
event.preventDefault(); // prevent the form from being
submitted
var number = Number(form.number.value);
var factors = String(factorsOf(number));
document.getElementById("output").innerHTML = factors;
}
function factorsOf(n) {
if (n < 0) {
throw new RangeError("Argument Error: Number must be
positive");
}
if (Math.floor(n) !== n) {
throw new RangeError("Argument Error: Number must be
an
↵ integer");
}
var factors = [];
for (var i=1 , max = Math.sqrt(n); i <= max ; i++) {
if (n%i === 0){
factors.push(i,n/i);
}
}
return factors.sort(function(a,b) { return a > b; });
}
This uses the same factorsof() function from Chapter 9 and adds a submit event
listener to the form. When the form is submitted, it will find the factors of the number in
the input field and then place the result inside the output div.