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How to go about loading an image from the internet using Gtk3 with javascript?

I tried using

var image = new Image();
image.src(url);

But this gives an error -> JS ERROR: ReferenceError: Image is not defined

Any helps?

Thanks.

//Update Since their was not enough information available above, I`ll post it down here ->

const Gtk = imports.gi.Gtk;
const Gdk = imports.gi.Gdk;
const Gio = imports.gi.Gio;

let app = new Gtk.Application({ application_id: 'org.gtk.ExampleApp' });


app.connect("activate", ()=>{

let win = new Gtk.Window({application : app});
let img = new Gtk.Image();

let url = 'https://spotlightreport.net/wp-content/uploads/2020/10/AC-DC-SHOT-IN-THE-DARK-PACK-SHOT-1920x1920.jpg';

let input_stream = Gio.MemoryInputStream.new_from_data(url, null);
let pixbuf = Gdk.GdkPixbuf.Pixbuf.new_from_stream(input_stream);

img.set_from_pixbuf(pixbuf);    

win.connect('destroy', ()=>{win.close();});
win.set_default_size(450,250);
win.show_all();
});
app.run([]);

I actually want to load the image from url directly i.e. without downloading it. And i came across a post to fetch data using javascript functions but it didn`t work. How do i fetch the image and show it? I actually tried to do this -> Post

Shreyansh Gholse
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  • Maybe `image.src = url` ? – Kokodoko Jan 09 '22 at 19:05
  • Well it says that Image() is not defined, so changing `image.src(url)` to `image.src = url` does`nt change anything. – Shreyansh Gholse Jan 09 '22 at 19:20
  • If you type `var image = new Image()` in a javascript console, you will see that it works. If it doesn't work in your project the problem must be somewhere else. You'll have to post a bit more code. – Kokodoko Jan 10 '22 at 10:50

1 Answers1

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There's very little code to go on here, but I can imagine several reasons why it doesn't work:

  • you didn't import the Gtk module
imports.gi.versions.Gtk = "3.0";
const { Gtk } = imports.gi;
  • you should add the namespace when referencing the class
const image = new Gtk.Image()  // Not `new Image()`
  • src() is not a method that exists in Gtk.Image nor does it mention that anywhere. You can find the JS documentation of Gtk.Image at https://gjs-docs.gnome.org/gtk30-image/ . As you'll see there, there is no method to load a Gtk.Image from a random URL (unless it happens to be a file). So you'll first have to download the contents of the URL, make a Gdk.Pixbuf out of it, and then use that for your Gtk.Image

In any case: I think it's best for you to first follow the GTK3 in GJS guide (there's also a section on using Gtk.Image) and start from some smaller examples. Once you learn the basics and start feeling comfortable with GJS, you can then proceed to start implementing custom stuff.

nielsdg
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