JavaScript font-size cookie

Question

I'm kind of new to JavaScript. I've created a function that changes the font size and I would like to save the size in a cookie, so that the user won't have to change it every time. But I haven't got the cookie part to work.

I'm using the following libraries: jQuery JavaScript Library v1.11.1 and https://developer.mozilla.org/en-US/docs/Web/API/document.cookie

function change_size(element, size) {
var new_size;
var current = parseInt(docCookies.getItem("FontSize"));
if (current !== "") {
    current = parseInt(element.css('font-size'));
}
if (size === 'smaller') {
    if (current > 12) {
        new_size = current - 2;
    }
}
else if (size === 'bigger') {
    if (current < 22) {
        new_size = current + 2;
    }
}
element.css('font-size', new_size + 'px');
docCookies.setItem("FontSize", num.toString(new_size), Infinity);
}

$('#smaller').click(function() {
    change_size($('p'), 'smaller');
});

$('#bigger').click(function() {
    change_size($('p'), 'bigger');
});

Answer 1

Change this line

docCookies.setItem("FontSize", num.toString(new_size), Infinity);

to

docCookies.setItem("FontSize", new_size, Infinity);

You don't have any num variable.

Also don't forget to set new font size on page load:

var fontSize = docCookies.getItem("FontSize");
if (fontSize) {
    $('p').css('font-size', fontSize + 'px');
}

Demo: http://jsfiddle.net/q56wkorw/