Javascript add js libraries by code

Question

I'm trying to split my long JavaScript code into different libraries.

I'm trying to write a wrapper script that will load all my libraries:

//this file loads all the scripts to the page    
$(document).ready(function(){
    var fileName = getCurrentFileName();
    loadScript("scripts/pico/popups.js");
    loadScript("scripts/pico/effects.js");
    loadScript("scripts/pico/pico.js");
    loadScript("scripts/pico/facebook.js");
    if (fileName != null)
        loadScript("script/pico/" + fileName + ".js");
});    
/**
     * Load a script to the body element
     * @param name the name of script file.js
     */
function loadScript(name){
    // Adding the script tag to the body
    var body = document.getElementsByTagName('body')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = name;
    // Fire the loading
    body.appendChild(script);
}    
/**
     * Get the current HTML file name
     * @returns {*} the name of the file or null
     */
function getCurrentFileName(){
    try {
        var fileName;
        fileName = document.location.pathname.match(/[^\/]+$/)[0];
        return fileName.split('.')[0];
    }
    catch (e){
        return null;
    }
}

but i think facebook.js is loaded before pico.js has finished loading - and these are functions from pico.js inside facebook.js..

how can i make sure the libraries will be loaded in the order i enter it ?

You would need to use the onreadystatechange handler to ensure that they are loaded in the order required. — user400654
– user400654, Commented Jan 22, 2014 at 21:01
code.google.com/p/minify Combines, minifies, and caches JavaScript and CSS files on demand to speed up page loads. — MrUpsidown
– MrUpsidown, Commented Jan 22, 2014 at 21:05

user400654 · Accepted Answer · 2014-01-22 21:07:55Z

You would need to use the onreadystatechange handler to ensure that they are loaded in the order required.

//this file loads all the scripts to the page

$(document).ready(function () {
    var fileName = getCurrentFileName();
    loadScript("scripts/pico/popups.js");
    loadScript("scripts/pico/effects.js");
    loadScript("scripts/pico/pico.js",function(){
        loadScript("scripts/pico/facebook.js");
        if (fileName != null) loadScript("script/pico/" + fileName + ".js");
    });
});

/**
 * Load a script to the body element
 * @param name the name of script file.js
 */
function loadScript(name,callback) {
    // Adding the script tag to the body
    var body = document.getElementsByTagName('body')[0];
    var script = document.createElement('script');
    script.onreadystatechange = function(){
        if (script.readyState === "complete" && $.isFunction(callback)) {
            callback();
        }
    }
    script.type = 'text/javascript';
    script.src = name;
    // Fire the loading
    body.appendChild(script);
}

Since jQuery is already included, it's even easier.

//this file loads all the scripts to the page

var fileName = getCurrentFileName();
$.getScript("scripts/pico/popups.js");
$.getScript("scripts/pico/effects.js");
$.getScript("scripts/pico/pico.js",function(){
    $.getScript("scripts/pico/facebook.js");
    if (fileName != null) $.getScript("script/pico/" + fileName + ".js");
});

Dalorzo · Accepted Answer · 2014-01-28 22:16:56Z

1

Have you consider using requirejs

http://www.joezimjs.com/javascript/lazy-loading-javascript-with-requirejs/

Here is sample version:

You can download Require here.
The sample is based on this folder structure :

public
- index.html
- scripts
  - app.js
  - lib
    
    ** jquery-1.10.2.js
    
    ** require.js

3 . From Code:

html

<!DOCTYPE html><html>
<head><title>Sample Test</title>
<script src="scripts/lib/require.js"></script>  <!-- downloaded from link provide above-->
<script src="scripts/app.js"></script></head>
<body><h1>My Sample Project</h1><div id="someDiv"></div></body></html>

application configuration app.js

requirejs.config({
    baseUrl: 'scripts',

    paths: {
        app: 'app',
        jquery: 'lib/jquery-1.10.2' //your libraries/modules definitions
    }
});

// Start the main app logic. loading jquery module
require(['jquery'], function ($) {
        $(document).on('ready',function(){
            $('#someDiv').html('Hello World');
        });
 });

edited Jan 28, 2014 at 22:16

answered Jan 22, 2014 at 21:04

Dalorzo

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1 Comment

Dalorzo Over a year ago

There is of course some options available using JQUERY api.jquery.com/jQuery.getScript

Community · Accepted Answer · 2017-05-23 12:21:00Z

0

What you are looking for is called "Dependency Management". There are several solutions out there for this problem.

One big one is RequireJS: http://requirejs.org/docs/start.html

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