How does RequireJS identify modules that have been loaded prior to loading RequireJS?

Recently started working with the Require JS Framework. I am currently developing Angular directives to be used as reusable web components in a web app. Within my Angular modules and directives, I have specified dependencies with Require JS. If certain dependencies like Angular JS or jQuery are already loaded on the HTML page, will Require JS recognize them within the directives?

Since the directives may come from different JavaScript files, is it possible to load Require JS only once?

Any suggestions for achieving the loading of JS files only once would be greatly appreciated.

Thank you, Santhosh

Answer №1

When using RequireJS, it is important to note that RequireJS only knows about what it loads itself. If a script loads jQuery through a script element and then a RequireJS module tries to load the jquery module again, RequireJS will attempt to load jQuery once more without checking if it has already been loaded with a script element before RequireJS was initialized.

However, there is a way for you to handle this situation. You can write code to specifically deal with this scenario. For example, your RequireJS configuration could include logic to verify whether jQuery is already defined:

if (typeof jQuery === 'undefined') {
    require.config({
        paths: {
            jquery: ...path/to/a/cdn/or/a/local/copy...
        }
    });
}
else {
    define('jquery', [], function () { return jQuery; });
}

In the above code snippet, the true branch of the if statement handles the case where jQuery has not yet been loaded and configures RequireJS to find it accordingly. On the other hand, the false branch defines a jquery module that simply returns the globally available jQuery, preventing RequireJS from reloading jQuery unnecessarily.

A similar approach can be taken when testing for Angular. It is worth noting that `require.config` can be invoked multiple times, and RequireJS will merge the values provided in each call.

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