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Errors when bundling javascript files of different pages into one

It looks stupid question, I'm using webpack to build static website
I wanted to bundle my JavaScript files of different pages into one
but some elements that I selected by JS that existing in home page and not in about page throwing error when I go to about page.
It's not effective just in console and I can ignore it
should I separate files ? if so is that possible to make webpack inject different pages with the proper JS file?
Thanks...

Try to make min files using webpack , or u cn use rollup.js
If possible please share code snippet.

Understanding Laravel Mix

Understanding Laravel Mix
I am currently in the process of migrating one of my websites to Laravel in order to make it a little more maintainable in future... I have plenty of experience building API's with Laravel but I have very limited experience building websites with Laravel and resultantly I am in need of a little bit of guidance from another pro.
In short, I would very much appreciate answers to the following very simple questions if anyone can spare me a couple of mins...
File based JS & CSS instead of App based
I like to write my JS and CSS files in a particular way where each page has their own specific files relevant to the page. For example, about.php might have the following dependencies:
JS:
jquery.js
any_other_third_party_library.js
app.js (global functions)
about.js (page specific functions)
CSS:
some_third_party_library.css
app.css (global styles)
about.css (page specific styles)
On my own framework, the above would be combined and minified into one file for JS and one file for CSS. From what I understand, Laravel Mix does exactly this...
However, as far as I can see, the way to do this would be as follows:
webpack.mix.js:
// About
mix.scripts([
'resources/assets/js/app.js',
'resources/assets/js/about/about.js'
], 'public/js/about/about.js');
Very simply, what I would like to know; is the above the correct way to go about this? Is there a better, more efficient, way to automate this for each page?
What are the bootstrap.js and app.js files?
From what I can see, these files just load dependencies but this is a little confusing as some dependencies might be page specific... Please can someone explain in a little further detail what these files are for? Or at least, what the difference is between them...
Getting rid of Vue
I have no interest in using Vue in my project so I have deleted the following files:
/components/Example.vue
and the Vue code in app.js
Does this matter in any way?

You'll bundle up all your styles and scripts a single file each and serve them to the client minified.
For front end assets, call mix.sass('resources/assets/sass/app.scss'). In that entry point to your styles you will be able to import your other stylesheets as you need using Sass's #import 'about'; syntax. (Rename your other CSS files to end in .scss too).
For your back end assets, call mix.js('resources/assets/js/app.js'). Then, similarly you can import other JavaScript modules using import './about.js';. You may want to look up ES2015 modules so you can learn how to write modular JavaScript.
Read through the bootstrap.js file to see how Laravel hooks up jQuery and Vue by default. You don't need any of this, so remove whatever you don't want or delete the entire file if you don't need any of it.
Vue comes out of the box with Laravel but it's just a suggestion, you can replace it with your own front end framework of choice or rip it out and replace it with nothing. Up to you.
Edit: Long story short; use mix.sass and mix.js, read up on using Sass and ES2015 modules to write awesome code.

Meteor css and javascript files loading best practice

TL,DR: How to load css and javascript files independent of Meteor assumptions about alphabetical order (which is far from how it works in practice.)
Stackoverflow tells me this question might be subjective but I hope not.
Meteor loads files based on alphabetical order (and other rules.)
So to force it to load the CSS and JS files in the order I wanted, I had to start the fiels with numbers that indicate the load order. If I have jquery.js and bootstrap.js, Meteor will load bootstrap.js before jquery.js. But bootstrap depends on jquery so jquery must be loaded first.
In order to solve this, the options are:
1. Put the files in the public directory and manually load them. But this didn't work as Meteor appears to be sending the files with text/html MIME type.
2. Create a Meteor package and specify the load order from there. I find this like hitting a fly with a hammer just for loading CSS and Javascript.
3. Put a number before every file. In the previous example, to load jquery before bootstrap, rename the fiels to 1.jquery.js and 2.bootstrap.js This works and is tedious but at least I get to load the files the way I want them to.
I am new to Meteor so I am wondering if there are recommended best practices concerning this. I was thinking of using AMD for javascript but that's limited to javascript.

Its an interesting question and this is probably one of the pitfalls of making a Meteor app.
You've mentioned all of the usable solutions such as creating an explicit package or renaming the files.
The best way I would think is to use the atmosphere packages. For example if you add bootstrap, jquery is a dependency of it so it will always load first. Most js libraries that involve load order are typically on atmosphere.
The other best way if there's no atmosphere package, though i'm not sure I would say is tedious is to put a number in front of the js file to indicate load order.
One thing is when you use the /public folder the files map to /, so you can load the js file yourself manually in the order you would want (in the root html file using /public. Meteor returns the text/html MIME type as its version of a 404 file not found error. This method is a bit troublesome though because the files are seperated in production and can cause trouble if one or the other dont load.

Ember.js - Loading additional .js-Files in some templates

Im developing a ember.js based app.
On some "sites" (templates) I want to load a specific js-game, so I have to include extra tags like <script src="game.js"></script>. But since handlebar-templates are defined by <script>-Tags itself, its not possible to simply put my dependencies within a template directly.
How can I include js-files on some individual sites only?

Including files in an Ember.js application is a bit more complex than in a regular website.
If you do not use ember-cli, then you could either include your all your JavaScript files directly in your index.html (one by one) or (and this is better) you could also bundle all your game JavaScript files into a single file (called games.js for instance) and include that single file in your index.html. You can bundle JavaScript files using tools such as grunt or brunch or broccoli.
Now if you do use ember-cli (which I recommend), then you could simply list your files in your Brocfile.js (see documentation here). Learning ember-cli might take a little bit of extra time but it will really help you in the future :)
Good luck!

Ok I found an possibility to solve that problem:
Like described in the handlebars.js-FAQ here (5.), I have to use some kind of a "Hack" to avoid parsing errors. Just need to add an empty command {{!}} into the word "script" like <scr{{!}}ipt src=...>...</scr{{!}}ipt.
That works for me.
Also, as kpdecker says here, it is better to use precompiled templates than defining them inline.

You can try to insert the necessary scripts from didInsertElement hook of the corresponding view. And, if so, in order to avoid duplicates, remove that scripts in willDestroyElement hook of the same view.

Can you use multiple .JS files when developing a complex Javascript application?

Coming from a C# background where every class is (best practices) stored in its own individual file, it makes development quite clean. I've never written anything complex in Javascript in the past, but I am starting to learn HTML 5 and I want to write a complex game using the HTML 5 canvas.
Putting all of my functions and code into a single .js file seems very messy. Is there a way to split it up, or a tool/IDE that lets you develop using separate files and compile them into a single one for deployment?
I guess I am looking for some best practice advice. Questions like this generally seem to get closed, so here are my specific questions to adhere to the SO FAQ that demands practical, answerable questions:
Does complex JS development usually involve all the code being in a single JS file? Eg. you're writing space invaders, do you just have spaceinvaders.js or do you have ships.js, logic.js etc.
Is it possible to split up your JS (whether using multiple script tags or pre-compiling to a single JS file) or to just put it all in a single file?
What's the industry standard? Does the HTML 5 spec make any recommendations?

There two possible ways.
Personally, I would use a build tool to simplify working with multiple files.
Using a build tool
Grunt
My favourite tool to keep up with complex js applications is grunt. With grunt you can develop in as many files as you want and use its plugins watch and concat to automatically concat them on save. You can do a lot more but this is the basic use case which may be helpful for you.
Grunt requires nodejs and takes some time to setup. But once you are ready with your Gruntfile setup it really speeds up your development process.
To make your project ready for production use you can also minify your scripts with some configuration and a single command.
A lot of the major javascript libraries are using grunt, easily recognizable based on their Gruntfile: jQuery, AngularJS, Twitter Bootstrap etc.
Grunt is also part of the development toolset yeoman.
Brunch
Brunch is another build tool which allows you to do similar things like grunt does.
Loading only the needed files
If you are developing a huge single page application and are concerned about the startup time of your application, one single file may not be the best solution. In this case you can use a javascript module loader.
Require.js
Therefor require.js is a goot fit. It allows you to only load the actual needed files on the current page. Though setting up require.js is a bit more work than setting up grunt.

Of course you can use more than one javascript file. How else would libraries like jQuery or Knockout function?
One thing to keep in mind, though, is that one of the things you want to do to keep your pages feeling snappy is to reduce the total number of http requests per page load. Adding a bunch of javascript files that are loaded separately causes an additonal request for each extra file. Therefore, you might want to experiment with a system for your build that stitches your javascript files together into a single item that you can use at deployment. There are a number of solutions out there that will do this for you in an automated way.

you could consider using requirejs - a very nice libray to split your javascript to modules.
it also provide a tool that you can "combine" all modules to a single file.

You can use as many javascript files as you want. Just add a link to them in your html code:
<body style="background-color: black" onload="main();" >
<!-- Your HTML body contents -->
<!-- Your scripts (here, I used HTML5 BoilerPlate to setup, and the links to jquery are provided) -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.9.1.min.js"><\/script>')</script>
<script src="js/main.js"></script>
</body>
Then you can hookup your main.js to listen for the main() function call:
function main() {
//here you can do your basic setup or delegate the control of the app to a different .js file.
}
or the jQuery document ready callback:
$(document).ready(function() {
//here is a good spot to hookup other jQuery listeners
});