加载图象到织品帆布背景 [英] load image to fabric canvas background

问题描述

您尝试上传图片并将其作为画布背景。代码片段：

hi im trying to upload an image and put it as canvas background. code snippet:

function handleMenuImage(e){
    var reader = new FileReader();
    reader.onload = function(event){
        var img = new Image();
        img.src = event.target.result;
        canvas.setWidth(img.width);
        canvas.setHeight(img.height);
        canvas.setBackgroundImage(img.src, canvas.renderAll.bind(canvas));

        //set the page background
        menuPages[currentPage].pageBackground.src = img.src;
        canvas.backgroundImageStretch = false;

    }
    reader.readAsDataURL(e.target.files[0]); 
}

问题是画布不显示背景。我可以看到在chrome devtools的画布背景src。背景实际上已经设置，但不知何故它不显示。

the problem is that the canvas not showing the background. i can see the canvas background src in chrome devtools. the background is actually have been set but somehow its not displayed.

推荐答案

这看起来很奇怪。如果你想在HTMLCanvasElement的背景图片，为什么不通过CSS设置背景图片？

That seems strangely confusing. If you want a background image on an HTMLCanvasElement, why not just set the background image via CSS?

#myCanvas {
  background-image: url(http://placekitten.com/100/100);
}

或通过JavaScript设置CSS：

Or set the CSS via JavaScript:

canvas.style.backgroundImage = 'url(http://placekitten.com/100/100)';

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