Dynamic include javascript file

Notice here we're loading the jQuery library first, so we can use it in controller. I'm loading this library from Google Libraries , but you can certainly add it however you'd like. As you can see, this is much cleaner, but unless you're planning to use the jQuery library throughout your JS code, it's not worth loading the entire library for this one function. You can't always be sure how your browser is going to handle the load order of your scripts. If you're scripts have interwoven dependencies, then you may consider using a tool like RequireJS to ensure your scripts are loaded in the appropriate order.

A brief description of CSS, before suggesting a couple free courses. A brief description of HTML, before suggesting a couple free courses. You can add JavaScript and CSS files to your master page if you want to overwrite some default styles or add some functionality via a new script. CSS JavaScript.

Below is a function where you can include CSS files programmatically. Would it really? My limited understanding of the Javascript parser is that this include is visible to those pieces of the DOM after invocation of the enclosing routine? If you were to put the include farther down the DOM, say in some lower div tag, then the routines would not be visible until that div tag got parsed? Sort of a stream; the way GZIP can do it things in chunks independent of what comes after.

Another twist on this would be on the server side. I wrote a Perl script that took various Javascript files and compiled them into one script dynamically based upon input parameters. However, doing this from within Javascript on the server would be cool.

Self modifying code! Wooo hooo! Speaking of GZIP. I think Schwab ran into trouble with this and inlined Javascript where the loading of the code crossed the GZIP size barrier and therefore partial Javascript was being uncompressed and failing to compile because the remaining code was in a following chunk? Unless you have over 18KB in your Javascript file or some crazy size then its probably not a problem. Each Javascript invocation is kinda of its own island, making code reuse problematic.

Yes, you are correct. Everything still happens at runtime and sequentially. This is not a static include like those constructed on the server-side.

Yes and no. It will all depend where and when you call the includeJavascript function. If you call the function anywhere in the body then the script-src tag and the execution of the dynamically included javascript will only happen at that time. I used the head node as the parent node to append the script-src tag simply as a place holder and not necessarily meant to imply that it will be there already when the head node is parsed.

In the absence of a known existing parent node to append the new script node, I thought the head node is the most logical choice since that node is created early on in the DOM. Safari 5. The technique we use at work is to request the javascript file using an AJAX request and then eval the return. If you're using the prototype library, they support this functionality in their Ajax.

Request call. This code is simply a short functional example that could require additional feature functionality for full support on any or given platform. Give it a try and please spare some feedback! I am lost in all these samples but today I needed to load an external. Here is a simple one with callback and IE support:. An absurd one-liner, for those who think that loading a js library shouldn't take more than one line of code :P.

Obviously if the script you want to import is a module, you can use the import NOTE: there was one similar solution but it doesn't check if the script is already loaded and loads the script each time. This one checks src property. In as much as I love how handy the JQuery approach is, the JavaScript approach isn't that complicated but just require little tweaking to what you already use Here is how I load JS dynamically Only when needed , and wait for them to load before executing the script that depends on them.

There are other ways approach one could accomplish this with JS but, I prefer this as it's require the basic JS knowledge every dev can relate. Not part of the answer but here is the JQuery version I prefer with projects that already include JQuery:. More on the JQuery option here. For example, in YUI, after loading the core you can do the following to load the calendar control. I have tweaked some of the above post with working example. Here we can give css and js in same array also.

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Collectives on Stack Overflow. Learn more. Dynamically load a JavaScript file Ask Question. Asked 13 years, 4 months ago. Active 6 months ago. Viewed k times. Example: document. Improve this question. Cole Tobin 8, 15 15 gold badges 44 44 silver badges 68 68 bronze badges.

Adam Adam Add a comment. Active Oldest Votes. If you use Prototype the Script. Improve this answer. What can I do to get it working for cross-domain? Then you have to scrape the data you want to access using some other program and provide it to yourself — David Schumann. Both of these solutions are discussed and illustrated here.

And it works! So what to do about it? But it's a pain to write all this stuff. This works. I hope sharing my experience here saves your time because I spent many hours on this. I'm using Angular 6 and applied template html,css,jquery The problem is the template has a js file which loads after the html elements are loaded to attach listeners events. That js file was hard to executre after angular app is loaded. Adding it to angular app angular. It is too much code to rewrite in typescript so this was great help.

Next comment I'll put the example becuse of comment length — Nour Lababidi. Portions of this post seem plagiarized from stackoverflow. It works.