Dynamically add script tag with src that may inclu

Question

I want to dynamically include a script tag in a webpage however I have no control of it's src so src="source.js" may look like this.

document.write('<script type="text/javascript">')
document.write('alert("hello world")')
document.write('</script>')
document.write('<p>goodbye world</p>')

Now ordinarily putting

<script type="text/javascript" src="source.js"></script> 

in the head works fine but is there any other way I can add source.js dynamically using something like innerHTML?

jsfiddle of what i've tried

Answer 1

the only way to do this is to replace document.write with your own function which will append elements to the bottom of your page. It is pretty straight forward with jQuery:

document.write = function(htmlToWrite) {
  $(htmlToWrite).appendTo('body');
}

If you have html coming to document.write in chunks like the question example you'll need to buffer the htmlToWrite segments. Maybe something like this:

document.write = (function() {
  var buffer = "";
  var timer;
  return function(htmlPieceToWrite) {
    buffer += htmlPieceToWrite;
    clearTimeout(timer);
    timer = setTimeout(function() {
      $(buffer).appendTo('body');
      buffer = "";
    }, 0)
  }
})()

Answer 2

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
});

Answer 3

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 );
}

Answer 4

You can try following code snippet.

function addScript(attribute, text, callback) {
    var s = document.createElement('script');
    for (var attr in attribute) {
        s.setAttribute(attr, attribute[attr] ? attribute[attr] : null)
    }
    s.innerHTML = text;
    s.onload = callback;
    document.body.appendChild(s);
}

addScript({
    src: 'https://www.google.com',
    type: 'text/javascript',
    async: null
}, '<div>innerHTML</div>', function(){});

Answer 5

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

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

document.head.appendChild(my_awesome_script);

Answer 6

Well, there are multiple ways you can include dynamic javascript, I use this one for many of the projects.

var script = document.createElement("script")
script.type = "text/javascript";
//Chrome,Firefox, Opera, Safari 3+
script.onload = function(){
console.log("Script is loaded");
};
script.src = "file1.js";
document.getElementsByTagName("head")[0].appendChild(script);

You can call create a universal function which can help you to load as many javascript files as needed. There is a full tutorial about this here.

Inserting Dynamic Javascript the right way