What is the most efficient way to import all scripts, stylesheets, and markup using just one JavaScript file?

In the realm of a fixed small snippet of code that cannot be altered after deployment (in an RIA), all elements are required to be loaded through a bootstrapper.js file:

<div id="someDivID"></div>
<script type="text/javascript" src="bootstrapper.js"></script>

What is the most efficient approach to loading js, css, and markup? Can we enhance the process with a more elegant, quicker, and sharper method than this one?:

function createDivs() {
  var jsDiv = document.createElement('div');
  jsDiv.id = 'allJavascriptHere';

  var contentDiv = document.createElement('div');
  contentDiv.id = 'allContentHere';

  document.getElementById("someDivID").appendChild(jsDiv);
  document.getElementById("someDivID").appendChild(contentDiv);

  function importScript(url){
     var script = document.createElement('script');
     script.type = 'text/javascript';
     script.src = url;
     document.getElementById("jsDiv").appendChild(script);
  }

    importScript("http://example.com/jquery-1.4.2.min.js");
    importScript("http://example.com/anotherScript.js");
 }

 window.onload = function(){

   $.get("http://example.com/someHTML.html", function(data) {
      $('#contentDiv').html(data);
      setTimeout("javaScript.init()", 200);
   });
 }

including stylesheets in the someHTML.html file as demonstrated below:

<style type="text/css">
   @import url("example.com/styleSheet.css");
</style>

(please note: The necessity of the setTimeout function is unexplained but seems indispensable. Your potential solution might eliminate this requirement.)

Answer №1

If you're looking to import scripts, jQuery's $.getScript() function is a great option.

In my recent work, I developed a function specifically for importing CSS files.

var loadCss = function(file, callback) {

    if (typeof callback !== 'function') {
        throw 'Invalid callback function provided';
    };

    $.get(file, function(css) {

        var headElement = $('head > link[rel=stylesheet]').length ? $('head > link[rel=stylesheet]:last') : $('head > *:last'); 

        headElement.after('<link rel="stylesheet" type="text/css" href="' + file + '">');

        callback();

    });


};

Answer №2

In case your CSS is included in the same JavaScript file, you have the option to directly insert CSS code into the document's style tag. This can come in handy in scenarios where incorporating a separate CSS file may not be permissible or feasible.

Answer №3

For those interested in asynchronously loading CSS with the ease of $.getScript, I recommend checking out loadCSS. It is a self-sufficient library designed for loading CSS independently from jQuery.

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