As a beginner to intermediate programmer exploring AJAX, I was intrigued while learning about JavaScript. It caught my attention that many examples I have come across incorporate PHP for this task. While some may say 'I'm going about it the wrong way' or 'JavaScript is a client-side language', I still have one question in mind...is it possible to write a file using only JavaScript?
Absolutely, you have the ability to do so. The extent of what API objects are accessible to your javascript engine will determine this.
Although, it is highly unlikely that the javascript engine in question supports this feature. Without a doubt, none of the popular web browsers will permit such action.
Javascript allows for the creation of cookies, and modern browsers support an SQLite database for storing data locally on the client side. However, it is not possible to store data in any random location on the disk.
A popular solution back in 2009 was to use Google Gears for creating JS applications that could store data locally. However, it is important to note that Google Gears has been deprecated since 2011 (source). Therefore, a more current approach is to utilize the local storage functionalities of HTML5
There is a workaround though. You have the option to utilize JavaScript for setting up an AJAX request to communicate with a server-side processing script. However, granting JS direct access to writing to disk, on either the client or server side, would present a significant security risk and potential vulnerability in browser applications.
Can you write a file to the local disk using plain JavaScript in a browser? The answer is no, you will need a helper to accomplish that task. One example is TiddlyWiki, a wiki engine that consists of just a single static HTML file. However, it has the capability to write itself to disk with the assistance of a Java applet known as Tiddly Saver.
One option is to use Windows Scripting Host for this task.
The latest update for Google Chrome (v52) has introduced a new feature that allows users to utilize the fetch API, service worker, and streams. By enabling streams using a specific flag, you can now take advantage of this functionality.
To explore some practical examples of how to implement streams, check out StreamSaver.js.
Here's an example of how you can incorporate this into your code:
const writeStream = fs.createWriteStream('filename.txt')
const encoder = new TextEncoder
let data = 'a'.repeat(1024)
let uint8array = encoder.encode(data + "\n\n")
writeStream.write(uint8array)
writeStream.close()
Alternatively, you can view some demos by visiting:
Unfortunately, accessing the filesystem with JavaScript is restricted due to security measures in the browser. ActiveX may be an option but it limits you to using IE only.
Note: While it may be possible if your engine permits it, I am not aware of any browser engines that allow this functionality.
If you are looking to allow users to download various file types such as .txt, .csv, and images through the browser download dialog, one option is to utilize data URIs along with the Data URI scheme using the <a href=... download=.../> tag.
For instance, to download a text file:
<a href="data:text/plain;charset=utf-8,TEXT_HERE" download="filename.txt"> Click here to download </a>
You can also programmatically set the href and download attributes using JavaScript and trigger the download with element.click().
However, it's important to note that this method requires user confirmation before the file can be downloaded.
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