嗨，我的页面上有以下JS。它在chrome和firefox上运行良好。但它不能在Internet Explorer 11上使用。我是Salesforce开发人员，并且对JavaScript的了解不多。您能帮我找到问题所在吗？提前致谢。
tests = {
filereader: typeof FileReader != 'undefined',
dnd: 'draggable' in document.createElement('span'),
formdata: !!window.FormData,
progress: "upload" in new XMLHttpRequest
},
support = {
filereader: document.getElementById('filereader'),
formdata: document.getElementById('formdata'),
progress: document.getElementById('progress')
},
progress = document.getElementById('uploadprogress'),
fileupload = document.getElementById('upload');
"filereader formdata progress".split(' ').forEach(
function (api) {
if (tests[api] === false) {
support[api].className = 'fail';
} else {
support[api].className = 'hidden';
}
}
);
function textBeforeDrag(flag){
if(flag)
{
holder_txt1.className = '';
holder_txt2.className = 'hidden';
}else{
holder_txt1.className = 'hidden';
holder_txt2.className = '';
}
}
function resetAll()
{
holder.className = holder_txt1.className = '';
holder_txt2.className = uploadStatus.className = 'hidden';
}
function readfiles(files) {
var goodSize = true;
var formData = tests.formdata ? new FormData() : null;
for (var i = 0; i < files.length; i++) {
size = typeof ActiveXObject !== 'undefined' ?
getIEFileSize(files[i])
:
files[i].fileSize || files[i].size;
goodSize = 5000000 > size;
if(!goodSize)
{
alert(files[i].name +' is too large, please choose a file that is 5Mb or less');
return;
}
goodSize = 26214400 > size+{!allAttSize};
if(!goodSize)
{
alert(this.files[0].name +' is too large - Total Attachment Size should not exceed 25MB');
return;
}
uploadStatus.className = '';
holder.className = 'hidden';
// now post a new XHR request
if (tests.formdata) {
var xhr = new XMLHttpRequest();
var sfdcurl = 'https://'+sfdcHostName+'.salesforce.com/services/apexrest/DragAndDrop/v1?FileName='+encodeURIComponent(files[i].name)+'&cType='+encodeURIComponent(files[i].type)+ '&parId={!thisCase.id}';
xhr.open('POST','/services/proxy' );
xhr.setRequestHeader("Authorization","Bearer {!$Api.Session_ID}");
xhr.setRequestHeader('SalesforceProxy-Endpoint', sfdcurl);
xhr.setRequestHeader('X-User-Agent', 'DragAndDropAPI v1.0');
xhr.onload = function() {
progress.value = progress.innerHTML = 100;
};
if (tests.progress) {
xhr.upload.onprogress = function (event) {
if (event.lengthComputable) {
var complete = (event.loaded / event.total * 100 | 0);
progress.value = progress.innerHTML = complete;
}
}
}
xhr.onreadystatechange=function()
{
if (xhr.readyState==4 && xhr.status != 200)
{
if(xhr.responseText)
alert(xhr.responseText);
else
alert('Some error occurred while uploading file');
console.log(xhr);
}else{
}
}
xhr.send(files[i]);
}
}
setTimeout(function(){addDroppedAttachment();},1000);
}
if (tests.dnd) {
holder.ondragover = function () {
this.className = 'hover';
textBeforeDrag(false);
return false;
};
holder.ondragend = function () {
this.className = '';
textBeforeDrag(true);
return false;
};
holder.ondrop = function (e) {
textBeforeDrag(true);
this.className = '';
e.preventDefault();
readfiles(e.dataTransfer.files);
resetAll();
}
} else {
fileupload.className = 'hidden';
fileupload.querySelector('input').onchange = function () {
readfiles(this.files);
};
}在行中：
var xhr = new XMLHttpRequest();
更改为：
var xhr = new ActiveXObject('Msxml2.XMLHTTP');
现在，您的文件上传仅在Internet Explorer 11中有效。
也许，要使您的文件上传能够在所有导航器（支持XMLHTTPRequest）中正常工作，请尝试以下操作：
if('ActiveXObject' in window){
return new ActiveXObject('Msxml2.XMLHTTP');
}else{
return new XMLHttpRequest();
}
资料来源：http : //www.purplesquirrels.com.au/2014/06/local-ajax-calls-ie11/。
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