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How to access filename from a folder using JavaScript

I am trying to build a simple website with just an index file and a folder full of icons for our internal purpose. I am making this so that anyone in our team can just access the link and download the icons whenever needed without our help. I am trying to read the icons file name from the folder automatically, so every time we update the folder with new ones we don't have to edit the HTML. I know only JavaScript. Please help me.

An alternative could be to produce a filelist of the files via a script or batch file (depending on OS, something like - in psudeo - ls path/to/images > filelist.txt) which redirect the output to a file that ends up in the same root as the index and images.
This file could then be read via fetch() or XMLHttpRequest() and parsed on client side to provide the basis for the links to the updates files.
This would require an extra step in the pipe-line of course, but could easily be automated using a listener for the image directory that triggers the script, part of your project setup and so forth.

This is not possible. In your case Javascript is running in the browser (client-side). It has no access to the servers filesystem. You need a server-side dynamic web-service (php, node.js, ...)

Possible download / upload manager embedded on html page with access to local filesystem

As the title indicates i want to have a certain application get access to the local file system. To describe why i will illustrate my situation:
I am a running a IIS WebApplication with the C# MVC 4 Framework as backend module. The site solely consists of HTML, CSS markup and some JS. The page will be loaded in IE11+ (Edge) only. For the standard procedure of displaying and accessing data from as well as sending data to the server this works quite fine.
On a certain page I want the user to be able to upload a file using a simple file dialog, like the one you can initiate with a simple <input type="file"> tag. I also want to offer the posibility to download files from the server but need to know where files has been saved / will be saved to.
As described on a lot of different websites, just like this one here, the HTML5 File API does a great job but will not be able to return the full qualified filename including the local path directions, same for JS accessing the file object.
As my research confirmed HTML5, JS and also SWF (Flash) will not report detailed information because they are all sandboxed applications or restricted by RFCs. I already unterstood and appreciate the effort to secure my trips to internet.
But in this case do need the paths where a file was upload from and the file has been downloaded to.
So my question is, what is the best way to expose the full path directions for a up- as well as downloaded file to report them back to the server?
Is it possible to embed a SWF object inside HTML which will run inside an Adobe AIR sandbox or is a signed JAVA Applet still the one and only solution to accomblish this security breaking task?
A solution i would also apreciate would be the possiblity to ask the user to get access the file system, like you grant access to the web push service to receive notifications.
Also if there is a possible solution which may suite my circumstances please let me know by adding some simeple examples / revealing some factful links, thanks in advance.

How can I code my web page to download a file from a site visitor's computer?

I am creating a html5 and javascript web page that allows you to draw your own picture. The page itself works, but I want to make it so my web application will create a folder in their Appdata (or Application Data if they're on a mac) directory.
Then I also want to make it so when a user logs back on to the website, all of their work is saved and they can pick up where they left off.
So basically, I want to be able to create a file on a client's directory, then be able to download that file once they have saved a change to their drawing. Is there a way I can do this? Thanks.

All of these things can be done by using the HTML5 file APIs.
Here are some links which will help you with your task:
http://www.html5rocks.com/en/tutorials/file/dndfiles/
http://www.html5rocks.com/en/features/file_access
Storing state can be accomplished by using one of the following technologies:
Cookies
localStorage
indexeddb
WebSQL

how get list of files in a folder using javascript

I am working on project for desktop application. I am using Qt controls with visual c++.
I am loading an html file in the QWebView as,
m_pWebView->load(QUrl("../../../demo/index_Splash_Screen.html"));
Now, what i want is, say, I have some .zip files in my location "c:\demo", I want list (or array of file names) of the files present in that directory.
How can i do this through javascript ?
PS: I went through this link, but it didnt match my requirement. I have not worked with of html, javascript and jquery. Please help me.

I'm afraid you cannot access local files or directories using javascript due to security issues.
Edit: I hadn't thought about the file api so thought for a moment this might not be true, but without some user input to give permission, this still cannot be done.
This question has a good response from PhilNicholas:
I'm afraid I may be the bearer of bad news for your design: The action
you are requesting expressly violates the security model as specified
in the File API spec. The client implementation of FileReader() must
make sure that "all files that are being read by FileReader objects
have first been selected by the user." (W3C File API , 13. Security
Considerations: http://www.w3.org/TR/FileAPI/#security-discussion).
It would be a huge security risk of browser scripts could just
arbitrarily open and read any file from a path without any user
interaction. No browser manufacturer would allow unfettered access to
the entire file system like that.
Thinking about it however, if it is all being run locally, you could use ajax to query a server side script that could return the directory you request.

If it is a Windows application then you could access the local filesystem by using ActiveX objects. You might have a look at this link Reading a txt file from Javascript
Note that activeX usage is possible only when using IE as browser/engine; I used to need it a while ago for developing an HTML application (.hta files).

How can I use Javascript to perform background updates of a Phonegap application?

I am using PhoneGap to develop an application for Android and iOS, and recently in a discussion about this technology, someone told me a seemingly brilliant idea that I can do background updates of my application without having to submit a new application to the app store.
The problem is that, being that I am still fairly new to the HTML5/CSS and Javascript world, I cannot figure out how to download files to my www directory for permanent storage. I can dynamically load JS code or HTML pages at runtime, but I want to create some javascript module that will find that a certain .css, .html, or .js file is out of date, download the new version of that file from some http or file server to the www directory, and then have that new file permanently saved so that it is available the next time the app is opened.
I feel like this should be simple, but I can't figure out how to do it. Thanks in advance.

In order to permanently save files to the devices you will need to make use of the PhoneGap File APIs. Periodic tasks can be achieved with a simple Javascript timer.