JavaScript-如何加载图像

Question

Just wondering how I would load an image using JS like this:

Maps.js

{id: 21, colour: 'res/pillar.png', solid: 1, bounce: 
0.30}, /*Loading the image in as an attribute*/

Engine.js

/*From draw_tile function*/

if (!tile || !tile.colour) return;
debugger;
context.drawImage(tile.colour, x, y);
context.fillRect(
    x,
    y,
    this.tile_size,
    this.tile_size
);

-----------------------------------

/*From draw_map function*/

this.draw_tile(t_x, t_y, this.current_map.data[y][x], context);

Console:

tile.colour
"res/pillar.png"

Attribute is working.

But get this error on - context.drawImage()

Engine.js:173 Uncaught TypeError: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)'
at Engine.draw_tile (Engine.js:173)
at Engine.draw_map (Engine.js:199)
at Engine.draw (Engine.js:450)
at Loop (index.html:87)
at index.html:94

I'm probably poorly going about this or that I am just missing something, but how do I load the image in the way I am coding? I also believe I may need an onload() but where?

Andy

Answer 1

The provided value is not of type '(CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas)'

The error is telling you that drawImage expects an Image (or a few other options) - not a string:

var imgTile = new Image();
imgTile.src = tile.colour;
imgTile.onload = function() {
   context.drawImage(imgTile, x, y)
}