Mozilla 和 webkit 浏览器现在都允许上传目录。当在 <input type="file"> 选择一个或多个目录时元素或放在一个元素上，如何按照它们在firefox和chrome/chromium的实际目录中出现的顺序列出所有目录和文件，并在迭代所有上传的目录时对文件执行任务？
最佳答案
您可以设置webkitdirectory和 allowdirs <input type="file"> 的属性元素;附上change , drop事件到 <input type="file">元素;使用 .getFilesAndDirectories()在 Mozilla，.createReader() , .readEntries()在 webkit , Array.prototype.reduce() , Promise , 递归。
请注意 Firefox drop事件未将选择列为 Directory , 但是一个 File具有 size 的对象0 ，因此在 Firefox 中放置目录不提供已放置文件夹的表示，即使在 event.dataTransfer.getFilesAndDirectories()被利用。当 allowdirs 时，firefox 还提供了两个输入元素。属性已设置；第一个元素允许上传单个文件，第二个元素允许上传目录。 Chrome / Chrome 提供单<input type="file">只能选择单个或多个目录的元素，而不是单个文件。
在包含文件和目录的目录中，首先读取目录。
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
input[type="file"] {
width: 98%;
height: 180px;
}
label[for="file"] {
width: 98%;
height: 180px;
}
.area {
display: block;
border: 5px dotted #ccc;
text-align: center;
}
.area:after {
display: block;
border: none;
white-space: pre;
content: "Drop your files or folders here!\aOr click to select files folders";
position: relative;
left: 0%;
top: -75px;
text-align: center;
}
.drag {
border: 5px dotted green;
background-color: yellow;
}
#result ul {
list-style: none;
margin-top: 20px;
}
#result ul li {
border-bottom: 1px solid #ccc;
margin-bottom: 10px;
}
#result li span {
font-weight: bold;
color: navy;
}
</style>
</head>
<body>
<label id="dropArea" class="area">
<input id="file" type="file" directory allowdirs webkitdirectory/>
</label>
<output id="result">
<ul></ul>
</output>
<script>
var dropArea = document.getElementById("dropArea");
var output = document.getElementById("result");
var ul = output.querySelector("ul");
function dragHandler(event) {
event.stopPropagation();
event.preventDefault();
dropArea.className = "area drag";
}
function filesDroped(event) {
var webkitResult = [];
var mozResult = [];
var files;
console.log(event);
event.stopPropagation();
event.preventDefault();
dropArea.className = "area";
// do mozilla stuff
// TODO adjust, call `listDirectory()`, `listFile()`
function mozReadDirectories(entries, path) {
console.log("dir", entries, path);
return [].reduce.call(entries, function(promise, entry) {
return promise.then(function() {
return Promise.resolve(entry.getFilesAndDirectories() || entry)
.then(function(dir) {
return dir
})
})
}, Promise.resolve())
.then(function(items) {
var dir = items.filter(function(folder) {
return folder instanceof Directory
});
var files = items.filter(function(file) {
return file instanceof File
});
if (files.length) {
// console.log("files:", files, path);
files.forEach(function(file) {
console.log(file)
});
mozResult = mozResult.concat.apply(mozResult, files);
}
if (dir.length) {
// console.log(dir, dir[0] instanceof Directory);
return mozReadDirectories(dir, dir[0].path || path);
} else {
if (!dir.length) {
return Promise.resolve(mozResult).then(function(complete) {
return complete
})
}
}
})
};
function handleEntries(entry) {
let file = "webkitGetAsEntry" in entry ? entry.webkitGetAsEntry() : entry
return Promise.resolve(file);
}
function handleFile(entry) {
return new Promise(function(resolve) {
if (entry.isFile) {
entry.file(function(file) {
listFile(file, entry.fullPath).then(resolve)
})
} else if (entry.isDirectory) {
var reader = entry.createReader();
reader.readEntries(webkitReadDirectories.bind(null, entry, handleFile, resolve))
} else {
var entries = [entry];
return entries.reduce(function(promise, file) {
return promise.then(function() {
return listDirectory(file)
})
}, Promise.resolve())
.then(function() {
return Promise.all(entries.map(function(file) {
return listFile(file)
})).then(resolve)
})
}
})
function webkitReadDirectories(entry, callback, resolve, entries) {
console.log(entries);
return listDirectory(entry).then(function(currentDirectory) {
console.log(`iterating ${currentDirectory.name} directory`, entry);
return entries.reduce(function(promise, directory) {
return promise.then(function() {
return callback(directory)
});
}, Promise.resolve())
}).then(resolve);
}
}
// TODO: handle mozilla directories, additional directories being selected dropped and listed without
// creating nested list at `html` where different directory selected or dropped
function listDirectory(entry) {
console.log(entry);
var path = (entry.fullPath || entry.webkitRelativePath.slice(0, entry.webkitRelativePath.lastIndexOf("/")));
var cname = path.split("/").filter(Boolean).join("-");
console.log("cname", cname)
if (!document.getElementsByClassName(cname).length) {
var directoryInfo = `<li><ul class=${cname}>
<li>
<span>
Directory Name: ${entry.name}<br>
Path: ${path}
<hr>
</span>
</li></ul></li>`;
var curr = document.getElementsByTagName("ul");
var _ul = curr[curr.length - 1];
var _li = _ul.querySelectorAll("li");
if (!document.querySelector("[class*=" + cname + "]")) {
if (_li.length) {
_li[_li.length - 1].innerHTML += `${directoryInfo}`;
} else {
_ul.innerHTML += `${directoryInfo}`
}
} else {
ul.innerHTML += `${directoryInfo}`
}
}
return Promise.resolve(entry);
}
// TODO: handle mozilla files
function listFile(file, path) {
path = path || file.webkitRelativePath || "/" + file.name;
var filesInfo = `<li>
Name: ${file.name}</br>
Size: ${file.size} bytes</br>
Type: ${file.type}</br>
Modified Date: ${file.lastModifiedDate}<br>
Full Path: ${path}
</li>`;
var currentPath = path.split("/").filter(Boolean);
currentPath.pop();
var appended = false;
var curr = document.getElementsByClassName(`${currentPath.join("-")}`);
if (curr.length) {
for (li of curr[curr.length - 1].querySelectorAll("li")) {
if (li.innerHTML.indexOf(path.slice(0, path.lastIndexOf("/"))) > -1) {
li.querySelector("span").insertAdjacentHTML("afterend", `${filesInfo}`);
appended = true;
break;
}
}
if (!appended) {
curr[curr.length - 1].innerHTML += `${filesInfo}`;
}
}
console.log(`reading ${file.name}, size: ${file.size}, path:${path}`);
webkitResult.push(file);
return Promise.resolve(webkitResult)
};
function processFiles(files) {
Promise.all([].map.call(files, function(file, index) {
return handleEntries(file, index).then(handleFile)
}))
.then(function() {
console.log("complete", webkitResult)
})
.catch(function(err) {
alert(err.message);
})
}
if ("getFilesAndDirectories" in event.target) {
return (event.type === "drop" ? event.dataTransfer : event.target).getFilesAndDirectories()
.then(function(dir) {
if (dir[0] instanceof Directory) {
console.log(dir)
return mozReadDirectories(dir, dir[0].path || path)
.then(function(complete) {
console.log("complete:", complete);
event.target.value = null;
});
} else {
if (dir[0] instanceof File && dir[0].size > 0) {
return Promise.resolve(dir)
.then(function(complete) {
console.log("complete:", complete);
})
} else {
if (dir[0].size == 0) {
throw new Error("could not process '" + dir[0].name + "' directory"
+ " at drop event at firefox, upload folders at 'Choose folder...' input");
}
}
}
}).catch(function(err) {
alert(err)
})
}
// do webkit stuff
if (event.type === "drop" && event.target.webkitdirectory) {
files = event.dataTransfer.items || event.dataTransfer.files;
} else if (event.type === "change") {
files = event.target.files;
}
if (files) {
processFiles(files)
}
}
dropArea.addEventListener("dragover", dragHandler);
dropArea.addEventListener("change", filesDroped);
dropArea.addEventListener("drop", filesDroped);
</script>
</body>
</html>
plnkr http://plnkr.co/edit/ff5vmuuIMzSapu6MiUJ3?p=preview
关于javascript - 如何使用更改和删除事件在 firefox 和 chrome/chromium 上上传和列出目录，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39664662/