所以我有这个代码,用于通过 ajax 将文件上传到 PHP,但显然我的网络主机没有 ajax。没有ajax有什么办法可以做到吗?具体来说,我指的是在进度条部分之后的 UploadFile 函数(这似乎也不起作用......)
(function() {
// getElementById
function $id(id) {
return document.getElementById(id);
}
// output information
function Output(msg) {
var m = $id("messages");
m.innerHTML = msg + m.innerHTML;
}
// file drag hover
function FileDragHover(e) {
e.stopPropagation();
e.preventDefault();
e.target.className = (e.type == "dragover" ? "hover" : "");
}
// file selection
function FileSelectHandler(e) {
// cancel event and hover styling
FileDragHover(e);
// fetch FileList object
var files = e.target.files || e.dataTransfer.files;
// process all File objects
for (var i = 0, f; f = files[i]; i++) {
ParseFile(f);
UploadFile(f);
}
}
//upload images
function UploadFile(file) {
var xhr = new XMLHttpRequest();
if ( xhr.upload && file.type == "image/jpeg" || file.type == "image/gif" || file.type == "image/jpg" || file.type == "image/png" && file.size <= $id("MAX_FILE_SIZE").value
) {
//create progress bar
var o = $id("progress");
var progress = o.appendChild(document.createElement("p"));
progress.appendChild(document.createTextNode("upload " + file.name));
//progress bar
xhr.upload.addEventListener("progress", function(e) {
var pc = parseInt(100 - (e.loaded / e.total * 100));
progress.style.backgroundPosition = pc + "% 0";
}, true);
//file received/failed
xhr.onreadystatechange = function(e) {
if (xhr.readyState == 4) {
progress.className = (xhr.status == 200 ? "success" : "failure");
}
};
//start upload
xhr.open("POST", $is("upload").action, true);
xhr.setRequestHeader("X_FILENAME", file.name);
xhr.setRequestHeader("Content-type", file.type);
xhr.send(file);
}
}
// initialize
function Init() {
var fileselect = $id("fileselect"),
filedrag = $id("filedrag"),
submitbutton = $id("submitbutton");
// file select
fileselect.addEventListener("change", FileSelectHandler, false);
// is XHR2 available?
var xhr = new XMLHttpRequest();
if (xhr.upload) {
// file drop
filedrag.addEventListener("dragover", FileDragHover, false);
filedrag.addEventListener("dragleave", FileDragHover, false);
filedrag.addEventListener("drop", FileSelectHandler, false);
filedrag.style.display = "block";
// remove submit button
submitbutton.style.display = "block";
}
}
// output file information
function ParseFile(file) {
Output(
"<p>File information: <strong>" + file.name +
"</strong> type: <strong>" + file.type +
"</strong> size: <strong>" + file.size +
"</strong> bytes</p>"
);
// display an image
if (file.type.indexOf("image") == 0) {
var reader = new FileReader();
reader.onload = function(e) {
Output(
"<p><strong>" + file.name + ":</strong><br />" +
'<img src="' + e.target.result + '" /></p>'
);
}
reader.readAsDataURL(file);
$("#fileselect").val(file);
}
// display text
if (file.type.indexOf("text") == 0) {
var reader = new FileReader();
reader.onload = function(e) {
Output(
"<p><strong>" + file.name + ":</strong></p><pre>" +
e.target.result.replace(/</g, "<").replace(/>/g, ">") +
"</pre>"
);
}
reader.readAsText(file);
}
}
// call initialization file
if (window.File && window.FileList && window.FileReader) {
Init();
}
})();