Get the current existing data in a folder

[Milena]

I just want to ask if there is a code that allows us to detect the current existing data in a folder. For example, in my img folder I have a folder named samplefolder. Inside the samplefolder folder, I have three files, 'blockA.png', 'blockB.png' and 'blockC.png'. Now, I want to check if those three exist on that folder. I am just wondering if there is a javascript code that would let me kinda check if the folder samplefolder exists and those three images exist.

Thank you in advance.

 

[Iavra]

With "normal" JavaScript, that's not possible. You can use the 'fs' module in Node.js (local game), though.


/edit: To clarify: It's possible to detect specific files via Ajax, but you can't just get a list of ALL files in a folder without Node.js.

 

[Milena]

Is that supported by ES5 / RPG Maker MV in general? I would like to know how to do this in Node.js. I would like to see an example and see what are the limitation it brings. If it is not possible, would there be an alternative that checks if a file is existent inside the game folder, so I can alert the user that such image does not exist.

 

[Iavra]

You can find the fs API here: https://nodejs.org/api/fs.html

Node.js only works in local mode (not deployed online, don't know about Android/iOS).

Without Node.js, you can use Ajax like this:

var request = new XMLHttpRequest();request.open('HEAD', url);   // Path to filerequest.onload = function() { /* file exists */ };request.onerror = function() { /* file doesn't exist */ };request.send();

Note, that this is asynchronous, so you don't know if the file exists, until one of the 2 callbacks gets called. You can change this to a synchronous call, by changing the second line like this:

request.open('HEAD', url, false);

This will freeze your game, until the request returns and some browsers (like Chrome) log a warning, when doing a synchronous AJAX call, though.

 

[Zalerinian]

I've already made a plugin to maintain a file list. It will automatically update every time the game is run on the local client, so if you upload it to a webserver it will maintain that list that it last had.

 

[jamespedid]

You can set up a web server for your game (which you should probably do anyway if you ever deploy it); from here, you can pretty much do anything for your game that you can do on a normal web site, since you are serving up content.

If the purpose of this is just to satisfy your laziness, however, you're better off trying to compile everything into a single Javascript file. You can do this pretty easily using a ruby script, for example, or you can look to more sophisticated build libraries.

 

[Milena]

Ohhh this became harder than I thought. I will use Zale's plugin for this. It seems it is a better solution that the one I thought of. I thought there was a manual way for this or a simpler way only for PC developed games (those that are not to be shared online, webserver or an html5 game).

 

[SilverDash]

PC only solution: http://forums.rpgmakerweb.com/index.php?/topic/50866-check-if-local-file-exists/?hl=%2Bfile+%2Bexist#entry503193