pdfmake base64 图像回调

Question

我必须使用 pdfmake 在我的 laravel 应用程序中构建 pdf 预览。我是一个 JavaScript 菜鸟，疯狂地为 b 中的图像生成 dataURI。希望你能帮助我。 如何将生成的 base64 放入我的文档定义中？

function convertImageToDataURL(src, callback, outputFormat) {
// Create an Image object
var img = new Image();
// Add CORS approval to prevent a tainted canvas
img.crossOrigin = 'Anonymous';
img.onload = function() {
var canvas = document.createElement('CANVAS');
var ctx = canvas.getContext('2d');
var dataURL;
canvas.height = this.naturalHeight;
canvas.width = this.naturalWidth;
ctx.drawImage(this, 0, 0);
dataURL = canvas.toDataURL(outputFormat);
callback(dataURL);
// Mark the canvas to be ready for garbage
// collection
canvas = null;
};
img.src = src;
// make sure the load event fires for cached images too
if (img.complete || img.complete === undefined) {
// Flush cache
img.src = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
// Try again
img.src = src;
}
}
convertImageToDataURL(
'{{asset('storage/'.$report->author->enterprises->first()->logo_image)}}',
function(dataUrl) {
// console.log('RESULT:', dataUrl);
// Put dataUrl into DocDefinition here!?!?
// return dataUrl is undefined
}
);`

Answer 1

好的。正如我所说：我是一个JavaScript菜鸟。所以我把脚本改成了这个：

function convertImageToDataURL(imgSrc) {
img = new Image();
img.src = imgSrc;
img.crossOrigin = "Anonymous";
var canvas = document.createElement("canvas");
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var dataURL = canvas.toDataURL("image/jpg");
canvas = null;
return dataURL;
}

它可能不美丽也不优雅，但它对我有用。