Dynamically add script tag with src that may include document.write

Solution 1:

var my_awesome_script = document.createElement('script');

my_awesome_script.setAttribute('src','http://example.com/site.js');

document.head.appendChild(my_awesome_script);

Solution 2:

You can use the document.createElement() function like this:

function addScript( src ) {
  var s = document.createElement( 'script' );
  s.setAttribute( 'src', src );
  document.body.appendChild( s );
}

Solution 3:

There is the onload function, that could be called when the script has loaded successfully:

function addScript( src, callback ) {
  var s = document.createElement( 'script' );
  s.setAttribute( 'src', src );
  s.onload=callback;
  document.body.appendChild( s );
}

Solution 4:

a nice little script I wrote to load multiple scripts:

function scriptLoader(scripts, callback) {

    var count = scripts.length;

    function urlCallback(url) {
        return function () {
            console.log(url + ' was loaded (' + --count + ' more scripts remaining).');
            if (count < 1) {
                callback();
            }
        };
    }

    function loadScript(url) {
        var s = document.createElement('script');
        s.setAttribute('src', url);
        s.onload = urlCallback(url);
        document.head.appendChild(s);
    }

    for (var script of scripts) {
        loadScript(script);
    }
};

usage:

scriptLoader(['a.js','b.js'], function() {
    // use code from a.js or b.js
});