Tips for loading angularjs script files

In my AngularJS application, I have various controllers, services, and directives spread across multiple JavaScript files. While in reality there are more than just three of them, let's consider them as controller.js, service.js, and directive.js. To reduce HTTP requests, I decided to combine all these files into one, which I'll refer to as app.js. Therefore, the structure of my index.html now looks like this:

<html lang="en">
<body>
    <div data-ng-view></div>
    <script src="app.js"></script>
</body>
</html>

However, during development, I prefer debugging individual files rather than the combined one. So, by modifying the index.html accordingly, I can achieve this setup:

<html lang="en">
<body>
    <div data-ng-view></div>
    <script src="controller.js"></script>
    <script src="service.js"></script>
    <script src="directive.js"></script>
</body>
</html>

The challenge here is that I don't want to make changes directly to index.html. Is there a way to introduce something like:

require('controller.js');
require('service.js');
require('directive.js');

inside my app.js? After some research, I found that it's possible to use AngularJS and RequireJS together for this purpose. However, adopting this solution would require me to redefine my controllers and services following the RequireJS format, which seems quite cumbersome. Moreover, dynamic loading is unnecessary since only one JavaScript file needs to be downloaded in the production environment.

Answer ā„–1

One effective solution is to utilize sourcemaps, allowing the browser to understand the original file even when it's combined into one. Learn more from html5rocks.

I highly recommend using a javascript task runner/build system like grunt or gulp for such tasks.

Creating concatenated files and sourcemaps with gulp can be easily achieved:

var gulp = require('gulp');
var concat = require('gulp-concat');
var sourcemaps = require('gulp-sourcemaps');

gulp.task('javascript', function() {
  return gulp.src('src/**/*.js')
    .pipe(sourcemaps.init())
      .pipe(concat('all.js'))
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('dist'));
});

Another option is using the plugin gulp-preprocess, which allows setting up different environment variables for tasks such as development or production, loading either the concatenated file or individual ones accordingly.

Apologies for suggesting solutions relying on external plugins, but they can significantly save you time!

Answer ā„–2

If you're looking to maintain separate files for testing and debugging purposes, but want to combine them for production, I would suggest using a build system such as Grunt.js or my personal favorite, Gulp.js. These automated build tools can be set up to create tasks that organize your project directory, merge, compress, and optimize the JS files, while also generating maps for referencing the original files in development tools. This can greatly streamline your workflow. Keep in mind that Node.js is required for this setup, so make sure to have it installed. It may require some effort initially, but it's likely more efficient than rewriting all of your code from scratch.

A sample build file tailored to your specific situation could resemble the following:

//this(my-js) will grab all js file in the js directory, combine, minify, mangle,
//rename and create sourcemaps. it also has a dependency(js-libs) to handle
//your libraries first.
gulp.task('my-js', ['js-libs'], function() {
return gulp.src([
        'src/js/*.js',
    ])
    .pipe(plumber())
    .pipe(sourcemaps.init())
    .pipe(concat('app.min.js'))
    .pipe(uglify())
    .pipe(sourcemaps.write('maps'))
    .pipe(gulp.dest('build/js'));
});

//this task will run the js task and then start a task that watches the files for
//changes and reruns the my-js task anytime something changes
gulp.task('default', ['my-js'], function () {
    gulp.watch('src/js/*.js', ['my-js']);
});

This is just a quick example I devised on the spot, not yet tested. Remember, once ES6 is released we'll have the ability to use import 'somefile'. Additionally, with full implementation of HTTP/2, multiplexing will allow for multiple file requests within a single connection:

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