我正在使用 imgly 图像裁剪器插件,针对我的应用程序稍作修改。它当前将图像转换为dataUrl
并将图像输出为 base64 图像,我可以将其另存为 jpeg。我正在努力调整dataURItoBlob
找到函数here https://stackoverflow.com/questions/6850276/how-to-convert-dataurl-to-file-object-in-javascript#answer-7261048,到我的应用程序,这样我就可以将图像发布到 API 端点。到目前为止我有以下内容,但我不确定如何将最终图像附加到xhr.open('POST', '/', true);
renderButton.click(function (event) {
var dataUrl =
imgly.renderToDataURL("image/jpeg", { size: "1200" }, function (err, dataUrl) {
//Convert DataURL to Blob to send over Ajax
function dataURItoBlob(dataUrl) {
// convert base64 to raw binary data held in a string
// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
var byteString = atob(dataUrl.split(',')[1]);
// separate out the mime component
var mimeString = dataUrl.split(',')[0].split(':')[1].split(';')[0];
// write the bytes of the string to an ArrayBuffer
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
// write the ArrayBuffer to a blob, and you're done
//var bb = new BlobBuilder();
//bb.append(ab);
//return bb.getBlob(mimeString);
}
var blob = dataURItoBlob(dataUrl);
var fd = new FormData(document.forms[0]);
var xhr = new XMLHttpRequest();
fd.append("myFile", blob);
xhr.open('POST', '/', true);
xhr.send(fd);
//Appends generated dataUrl to a div
var image = $("<img><br>").attr({
src: dataUrl
});
//Remove button
image.appendTo($(".result"))
$button = $('<button class="btn btn-default remove">')
.text('Remove Image')
.on('click', function () {
image.remove();
$(this).remove();
return false;
});
$button.appendTo($(".result"));
});
});
});
Updated
“假设我使应用程序保持相同的形式,我正在尝试找出如何将 dataURL 放入 post 函数中。”
尝试在第 15 - 103 行http://jsfiddle.net/mattography/Lgduvce1/6/ http://jsfiddle.net/mattography/Lgduvce1/6/
var blob; // declare `blob`
// As soon as the user selects a file...
fileInput.addEventListener("change", function (event) {
var file; // declare `file`
var fileToBlob = event.target.files[0];
blob = new Blob([fileToBlob], {"type":fileToBlob.type});
// do stuff with blob
console.log(blob);
// Find the selected file
if(event.target.files) {
file = event.target.files[0];
} else {
file = event.target.value;
}
// Use FileReader to turn the selected
// file into a data url. ImglyKit needs
// a data url or an image
var reader = new FileReader();
reader.onload = (function(file) {
return function (e) {
data = e.target.result;
// Run ImglyKit with the selected file
try {
imgly.run(data);
} catch (e) {
if(e.name == "NoSupportError") {
alert("Your browser does not support canvas.");
} else if(e.name == "InvalidError") {
alert("The given file is not an image");
}
}
};
})(file);
reader.readAsDataURL(file);
});
// As soon as the user clicks the render button...
// Listen for "Render final image" click
renderButton.click(function (event) {
var dataUrl;
imgly.renderToDataURL("image/jpeg", { size: "1200" }
, function (err, dataUrl) {
// `dataUrl` now contains a resized rendered image with
// a width of 300 pixels while keeping the ratio
// Convert DataURL to Blob to send over Ajax
// function dataURItoBlob(dataUrl) {
// convert base64 to raw binary data held in a string
// doesn't handle URLEncoded DataURIs
// - see SO answer #6850276 for code that does this
// var byteString = atob(dataUrl.split(',')[1]);
// separate out the mime component
// var mimeString = dataUrl.split(',')[0].split(':')[1].split(';')[0];
// write the bytes of the string to an ArrayBuffer
// var ab = new ArrayBuffer(byteString.length);
// var ia = new Uint8Array(ab);
// for (var i = 0; i < byteString.length; i++) {
// ia[i] = byteString.charCodeAt(i);
// }
// write the ArrayBuffer to a blob, and you're done
// var bb = new BlobBuilder();
// bb.append(ab);
// return bb.getBlob(mimeString);
// }
var _data = dataUrl.split(/,/)[1];
// var fd = new FormData(document.forms[0]);
var xhr = new XMLHttpRequest();
function success(response) {
if (response.target.readyState === 4) {
var data = JSON.parse(response.target.response);
var image = "data:" + data.type + ";base64," + data.file;
console.log(image); // `data URI` of resized image
}
}
xhr.onload = success;
// fd.append("myFile", blob);
xhr.open("POST", "/echo/json/", true);
xhr.send("json=" + encodeURIComponent(
JSON.stringify({"file": _data,"type":blob.type})
)
);
也可以看看处理文件的上传进程 https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications#Handling_the_upload_process_for_a_file
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