Develop Reference

How To Access Local File System With Chrome Extensions

I am trying to build a Chrome extension but I have encountered a problem. I need access to a file that is in the same directory as my JS script. Here is the representation:
 my_script.js
 My Folder
  |-> my_file.file
I use a third party library that does some required things with it. And I need to pass in the path to my_file.file The problem is my_script.js gets injected into the website I am trying to change and the code instead of searching on the local file system it tries to find it in www.website.com/My Folder/my_file.file which obviously does not exist. How can I make it so that it seacrhes relative to my_script.js? I unfortunately can't pass the file itself to func(), it has to be the path of the file. The file I am trying to reach is about 200MB which I was planning on shipping with my extension. Also this project is vanilla JS. Thank you!
my_script.js
...
lib.func('My Folder/my_file.file').then(function (out) {
document.out = out;
});
...

How does "?v=" in HTML linking work?

I have been developing a website for testing new stuff, and I need to figure out the "?v=" thing. But I have no clue how it works, so can someone explain this to me please haha? Like how to, and how it works.
So what would this look like and how would the file names on the server vary for this:
<script src="assets/js/moticulous.js"></script>
<link rel="stylesheet" href="assets/js/platforms.css"/>
as opposed to this:
<script src="assets/js/moticulous.js?v=1"></script>
<link rel="stylesheet" href="assets/js/platforms.css?v=1"/>

This can be added to prevent Caching of js/css/image files. By adding ?anything=123 You force browser/client to download the updated version of js/css/image file from the server.
Read more on: https://css-tricks.com/can-we-prevent-css-caching/

That is a technique used to control caching of script, css and image files.
The browser will download the script file with the ?v=1 parameter (example"http://example.com/path/to/script.js?v=1") and cache it to the visitors disk. The next time the browser visits the page, if the URL is still "http://example.com/path/to/script.js?v=1" then the cached version will be loaded.
If you change the ?v=1 to ?v=2 then the cached version is no longer valid as the full URL is no longer the same as what the browser has cached. This results in a new file being downloaded, and cached. This forces recent changes to every visitor regardless of cache settings set at the server config or browser.
This technique is often used with a version number (likely why its a v=) to force a new download of the js when the software version gets updated.
In your backend code, you would replace the =1 part with whatever the current software version is to make this cache control dynamic. Alternately, you could increment the version number whenever the asset changes but that's less dynamic or more work to make it so.

The dummy HTTP GET string is passed to prevent caching as some browsers cache the .js and .css files. It is usually done to prevent the older version of the file from loading by the browsers via browser cache when a change is made to the .css or .js file. Adding the timestamp value to the name (as <filename>?<timestamp>) is more popular than adding the version as it forces the browser to download the files every time the page is viewed as no two request times have the same timestamp.

How to not tell browser not to save cache

I have a laravel 5.2 app. My problem comes every time I update my website, I have all my clients calling me because something is not working, and the problem is because some .js and .css are in the cache, and I have to explain them how to erase the cache.
What's the best solution?, How is the tag to tell the browsers to not cache my .js or .css (or some of them, specified)?.
Thank you

You can version your JS and CSS when including them in your HTML by adding a version to the tag, such as <link rel="stylesheet" href="style.css?v=3.4.1">
When you make a change to the CSS or JS, change the version, and anyone visiting the page will load the new version instead of relying on the browser cache.
If you are using elixir with Laravel there are options included for versioning and cache-busting https://laravel.com/docs/5.3/elixir#versioning-and-cache-busting

The way of making the browser will not save cache is by creating a new version for the source each time any user get to the web page.
The cache-buster query string can be updated so that the
browser doesn’t recognise the file in it’s cache and downloads a new
version.
I found a great information in the cache boosting link.
If you are using apache that link may be also very helpful.

In laravel there's a versioning for stylesheets and scripts. Use laravel-elixir can be found here.
If version only css stylesheet then you can use like:
elixir(function(mix) {
mix.version('css/all.css');
});
and you will have something like this all-16d570a7.css
If you want multiple files like css and js:
elixir(function(mix) {
mix.version(['css/all.css', 'js/app.js']);
});
And finally to run this versions you can simply enter the command below in your console:
gulp or to be more specific gulp version.
Hope this could help.

cannot find js file

I have stucture code like this:
I try to load javascript into php file like this:
But i have an error like this:
This is my html :
And this is another javascript:
And i try to copy paste the link, and i got an error 404 not found. How can i fix it? Thanks.

Permissions
When the host is correct, and the file is in the right place, and you have no other networking problems, you may sometimes still get a 404 because of bad file permissions. If a server does not have permission to access a file, it may send out a 404 error in response. The reason why some "Not Authorized" error is not given instead, is that this would reveal more information about the files than you, the owner of the server, may intend. The way to respond to requests for privileged files without revealing whether or not they exist is to give a 404.
On Windows, you can view and change the permissions from the File Explorer by right-clicking on the file or folder, then going to Properties -> Security -> Edit. For more information, see the notes on permissions on Microsoft's site.
File Types
Besides permissions, a server must also be configured to serve the type of file you are accessing. If files with different extensions are served, but .js files are not, check the configuration of your server to make sure that .js files aren't blacklisted (or not whitelisted, as the case may be).
Directory Location
You should also verify that the files are actually stored in the top-most directory of the web server if that's how you are accessing them. If they aren't, you may need to prefix the path with the path from the webserver root to your application directory. E.g., instead of fusioncharts/..., you may need /path/to/fusioncharts/... or ../../path/to/fusioncharts.
Other Considerations
In your particular case, you should also verify that the files inside the fusioncharts folder are actually structured the way you think. (E.g., is there really a js/[insert name here].js file inside the fusioncharts folder?
If none of that solves your problem, try to take something that is working and gradually make it more and more similar to the files that aren't working. By figuring out at which point you go from a working setup to a not working setup, you may discover the problem.

If you are referring to a file with path: /ui/new-file.js
then,
1.In html file include
<script type="text/javascript" src="/ui/new-file.js"></script>
2.In server.js or app.js whichever you have, include
app.get('/ui/new-file.js', function (req, res) {
res.sendFile(path.join(__dirname, 'ui', 'login-file.js'));
});

Assuming you are using codeigniter, you can use base_url() function to include JS files in your codeignitor view template file.
<script src="<?php echo base_url(); ?>fusioncharts/js/fusioncharts.js" type="text/javascript"></script>
codeigniter default view template is called welcome_message.php and this file is located in application/view folder.
This is how I include js files in my codeigniter projects. Hope this will help.

In the html you can write *script** in the head or in the body, but not in your file js, delete this in fusionCharts.js
<script type=text/javascript>
In fusionCharts.js write only the function without the script

If you are developing locally, try clearing your cache.
Google Chrome likes to use the cached JavaScript files instead of the real ones.
Clearing your cache should resolve the issue.

redirecting site to mobile...file name?

This is my first time creating a mobile site for someone I have the javascript code all set up and when tested on my phone, it redirects it to: m.websitename.com, like I want it to. However, I have no idea what to name the file I am wanting it to redirect to? I saved the file under: mobile.html, but it isn't redirecting to it.
I don't want it to redirect saying www.websitename.com/mobile, I don't think it looks as professional.
Thanks

index.html or default.html is the convention. so why not direct to
m.websitename.com/index.html
and configure the subdomain so that m.websitename.com is actually pointing to websitename.com/m folder. so that folder can have its own index file.

You would probably want to do this using subdomain and destination setup from your server you are using (Most of webhosting companies made this easy through their software e.g. cPanel). Directory structures is going to look like this. So when user was redirected t m.yourweb.com/ then it's not going to have m.yourweb.com/mobie.
domain [directory]
css [directory]
js [directory]
index.jsp [file]
purchase.jsp [file]
...
subdomain [directory] <- for mobile
css [directory]
js [directory]
index.jsp [file]
purchase.jsp [file]
So when mobile user was detected, JS is going to redirect this user to the subdomain (for mobile) instead of normal directory.
The other recommendation (which is better I think) is use the same logic from the above but when user was redirected to m.yourweb.com/ load css file for mobile version web instead of normal web. loading css through JS
If you think this is complicated, you might be interested in having a look at CSS3 media queries. This basically changes CSS layout depending on current users' screen. resolution Media queries tutorial

You can have any filename you like. But as btevfik mentioned either put index.html or default.html
I recommend index.html
Also you can set the default file in you server configuration. By default most servers have the default file handler as index.html. For Apache it will be either index.html or index.php. You can change this to something like mobile-handler.html by changing the server configuration.
So whenever you access your site by http://your-site.com or m.your-site.com the default file specified in the server configuration is loaded.
Please note that your-site.com and m.your-site.com will have different site root, hence request will be handled by difffernt files.