Kotlin.js Newbie question: How can I read from a l...

# javascript

[halirutan]

Kotlin.js Newbie question: How can I read from a local file (local to the user)? I’ve seen FileReader but I’m not sure it’s for reading local files. Is there any tutorial about this?

[diesieben07]

You're in the browser?

[halirutan]

My plan is to have a small website that lets you open a specific log-file which then renders the information inside the logfile as a graph.

[diesieben07]

Then FileReader is the way to go. See this information page on MDN:
https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications

[halirutan]

I’ve seen this one. In Kotlin, however, reader.readAsText wants some Blob object while I will have a filename, right?

[halirutan]

Or is it that I get the blob by reading an input field from the webpage?

[diesieben07]

You don't get access to file names, you are in the browser. The only access to files happens through an <input type="file">

[halirutan]

Alright. I’m still in the world of JVM and I though I write a separate function for parsing the file, so my idea was that I will get somehow the string 🙂

[halirutan]

Thanks! Let me look into this.

[diesieben07]

Yes, you will get the String. But you can only construct a FileReader based on the files a user provided through a File input

[diesieben07]

You cannot just read any file on the system for security reasons

[halirutan]

That makes perfect sense now you say it 🙈

[halirutan]

I’m definitely not a web guy. Thanks.