Can't insert js programmatically if it uses document.write

旧时模样 提交于 2019-12-02 01:35:38
Chamika Sandamal

use innerHTML instead of using document,write.

and use following code to register script,

(function() {
    var jq = document.createElement('script');
    jq.type = 'text/javascript';
    jq.async = true;
    jq.src = 'http://someurl/test.js';
    var s = document.body.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(jq, s);
})();

Document.write is ONLY for synchronous tasks when the html is loaded (for the very first time), never for asynchronous tasks like the one you are trying to do.

What you want to do is dynamically insert a <script> DOM element into the HEAD element. I had this script sitting around. As an example, it's a race condition, but you get the idea. Call load_js with the URL. This is done for many modern APIs, and it's your best friend for cross-domain JavaScript.

<html>
    <head>
        <script>
            var load_js = function(data, callback)
            {
                    var head = document.getElementsByTagName("head")[0];

                    var script = document.createElement("script");
                    script.type = "text/javascript";
                    script.src = data;
                    head.appendChild(script);

                    if(callback != undefined)
                            callback();
            }

            load_js("http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js");

            setTimeout(function() {
                $('body').html('loaded');
            }, 1000);
        </script>
    </head>

    <body></body>
</html>

There isn't anything wrong with your approach to inserting JavaScript. document.write just sucks a little bit. It is only for synchronous tasks, so putting a document.write in a separate script file is asking for trouble. People do it anyway. The solution I've seen most often for this is to override document.write.

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