[英]How can I post base64 image data to a Discord webhook (without using discord.js)?
[英]Send base64 image data “POST” using XMLHTTPREQUEST in js
我正在嘗試將base64數據發布到服務器,但是我收到一個錯誤“ Microsoft JScript運行時錯誤:無法獲取屬性'addEventListener'的值:對象為null或未定義”,在下面我附上了錯誤屏幕快照的任何幫助。
var imagefile = canvas.toDataURL("image/png");
imagefile = imagefile.replace("data:image/png;base64,", "");
var oXHR = new XMLHttpRequest();
oXHR.upload.addEventListener('loadstart', uploadFinish, false);
oXHR.upload.addEventListener('progress', uploadProgress, false);
oXHR.upload.addEventListener('error', uploaderror, false);
oXHR.open('POST',"http://demo.donelook.com/eyewearweb/levellens.aspx",true);
oXHR.send(imagefile);
我想你要:
oXHR.addEventListener('loadstart', uploadFinish, false);
oXHR.upload.addEventListener
有一個錯誤,應該是oXHR.addEventListener
。 另一個問題是並非所有瀏覽器都支持addEventListener
。 如果您使用的是純JavaScript,則必須執行以下操作。
if (!oXHR.addEventListener) {
oXHR.attachEvent("loadstart", uploadFinish);
}
else {
oXHR.addEventListener("loadstart", uploadFinish, false);
}
您可以將其編寫為單獨的函數,然后重新使用以確保瀏覽器的兼容性。 像這樣:
function addEventListener(element,type, listener, useCapture){
if (!element.addEventListener) {
element.attachEvent(type, listener);
}
else {
element.addEventListener(type, listener, useCapture);
}
}
您的代碼:
var imagefile = canvas.toDataURL("image/png");
imagefile = imagefile.replace("data:image/png;base64,", "");
var oXHR = new XMLHttpRequest();
addEventListener(oXHR,'loadstart', uploadFinish, false);
addEventListener(oXHR,'progress', uploadProgress, false);
addEventListener(oXHR,'error', uploaderror, false);
oXHR.open('POST',"http://demo.donelook.com/eyewearweb/levellens.aspx",true);
oXHR.send(imagefile);
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