javascript 使用fabric js时获取canvas对象
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Get the canvas object while using fabric js
提问by viji
I'm using Fabric.js and I've created a fabric canvas object at one place.
我正在使用 Fabric.js,并且在一个地方创建了一个 Fabric 画布对象。
var x = new fabric.Canvas("mycanvas");
Now at another place, I want to access this object where 'x' won't be available. So how can I get the same fabric canvas object.
现在在另一个地方,我想访问“x”不可用的这个对象。那么我怎样才能获得相同的织物画布对象。
I don't wanna change the scope of x or pass x as arg.
我不想更改 x 的范围或将 x 作为 arg 传递。
Also, how to get the toDataURL from the fabric canvas object?
另外,如何从结构画布对象中获取 toDataURL?
回答by Alnitak
Assuming that mycanvas
is the ID of a Canvas element, you could store the reference to the fabric object on the Canvas element itself:
假设这mycanvas
是 Canvas 元素的 ID,您可以在 Canvas 元素本身上存储对结构对象的引用:
var x = new fabric.Canvas("mycanvas");
document.getElementById("mycanvas").fabric = x;
You can then retrieve that object any time you want with:
然后,您可以随时使用以下命令检索该对象:
var y = document.getElementById("mycanvas").fabric;
var url = y.toDataURL("png", 1);