Checking if a variable is an integer in javascript.

Question

I made a form where the user inputs values for width and height that they want for the pop up window to be. I am using window.open for that.

So I think I need to check if the values for width and height are integer. I have a function that checks that a variable is an integer that is...

function isInteger(possibleInteger) {
    return !isNaN(parseInt(possibleInteger));
}

but I don't know how to call this function to the width and height function to check if the user inputted an integer. Can any one help?

Answer 1

var isWidthAnInteger = isInteger(document.getElementById('width').value);
var isHeightAnInteger = isInteger(document.getElementById('height').value);
if (isWidthAnInteger && isHeightAnInteger) {
    // TODO: window.open
}

where you have the following textboxes:

Width: <input type="text" id="width" name="width" />
Height: <input type="text" id="height" name="height" />

Answer 2

This is an answer to question mentioned in the topic, not the actual one in the body of the text :).

The following method is more accurate on determining if the string is a real integer.

function isInteger(possibleInteger) {
    return /^[\d]+$/.test(possibleInteger)​;
}

Your current method validates "7.5" for instance.