[英]Creating a Blob from an external image url
我有一個文件輸入,我曾經用它來獲取文件並將其轉換為Blob。 無論如何,我可以獲取一個外部圖像URL並將其轉換為Blob嗎? 這是我用來僅使用<input type="file" />
:
//Process the file and resize it.
function processfile(file) {
if (!(/image/i).test(file.type)) {
alert("File " + file.name + " is not an image.");
return false;
}
// read the files
var reader = new FileReader();
reader.readAsArrayBuffer(file);
reader.onload = function (event) {
// blob stuff
var blob = new Blob([event.target.result]); // create blob...
window.URL = window.URL || window.webkitURL;
var blobURL = window.URL.createObjectURL(blob); // and get it's URL
// helper Image object
var image = new Image();
image.src = blobURL;
image.onload = function () {
for (var x = 0; x < self.ThumbSizes.length; x++) {
// have to wait till it's loaded
var resized = resizeMe(image, self.ThumbSizes[x]); // send it to canvas
var resized_blob = dataURItoBlob(resized);
uploadFile(resized_blob, self.ThumbSizes[x].Name);
}
}
};
與其傳遞文件,我不希望能夠構造此代碼以傳遞圖像url並將其轉換為blob。
希望對您有幫助。 (我沒有運行它。)
function processfile(imageURL) {
var image = new Image();
var onload = function () {
var canvas = document.createElement("canvas");
canvas.width =this.width;
canvas.height =this.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(this, 0, 0);
canvas.toBlob(function(blob) {
// do stuff with blob
});
};
image.onload = onload;
image.src = imageURL;
}
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