Adding callback to javascript while loop

Question

I am trying to replicate a type-writer effect on a resume page of mine, and have if working except for one part:

while (i < tags.length) {
    type(tags[i], content[i], 0, 50);
    i++;
}

This is the function that writes out the lines, and it works correctly, except for the fact that it writes all of the lines at once. I would like for it to write a single line, then move on to the next, and so on and so forth. I know the solution lies in adding a callback function in but I can't seem to get it to work right. Any help/advice would be appreciated. Thanks!

Also, here is the full jsfiddle.

Answer 1

A callback and a recursive function seems like the way to go

var type = function (target, message, index, interval, callback) {    
    if (index < message.length) { 
        $(target).append(message[index++]); 
        setTimeout(function () { 
            type(target, message, index, interval, callback); 
        }, interval); 
    } else {
        callback();
    }
}

var i = 0;

(function recursive() {
    if (i < tags.length) {
        type(tags[i], content[i], 0, 50, recursive);
        i++;
    }
})();

FIDDLE