Javascript 文件上载长度错误(…files.Length)
我正在尝试创建一个多文件上传系统,但是Javascript 文件上载长度错误(…files.Length),javascript,html,file-upload,Javascript,Html,File Upload,我正在尝试创建一个多文件上传系统,但是fileInput.files.length的length属性未定义 未捕获的TypeError:无法读取未定义的属性“length” 我已尝试从document.getElementById(“file1[]) 将fileInput.files分配给另一个变量并调用thatVariable.length 两者都不起作用 由于这是一个多文件上传系统,我需要它在一个数组中 HTML代码: <form action='/' method='post' en
fileInput.files.length
的length属性未定义
未捕获的TypeError:无法读取未定义的属性“length”
我已尝试从document.getElementById(“file1[])
将fileInput.files
分配给另一个变量并调用thatVariable.length
两者都不起作用
由于这是一个多文件上传系统,我需要它在一个数组中
HTML代码:
<form action='/' method='post' enctype="multipart/form-data" id='file'>
<button type="button" onclick="document.getElementById('file1').click(); return false;" class="btn btn-primary" id='choosefile'><span class='glyphicon glyphicon-open-file'></span> Choose File</button><br>
<b id="filename"></b><br>
<input type="text" placeholder="New File Name" id="fileplaceholder">
<input type="file" id="file1" name="file1[]" style="visibility: hidden" onchange="filenameprint()" multiple>
<button type="button" onclick="uploadCloud()" class='btn btn-success' id='uploadfile'><span class="glyphicon glyphicon-upload"></span> Upload File</button><br>
<br>
<div class="progress">
<div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="40"
aria-valuemin="0" aria-valuemax="1" style="width:0%" id='progress'>
<span id='uploadpercent'></span>
</div>
</div>
<span id='loaded'></span>
<script>
function filenameprint() {
var file1 = document.getElementById('file1').value;
if (!empty(file1)) {
document.getElementById('filename').innerHTML = file1;
} else {
document.getElementById('filename').innerHTML = "No File Chosen"
}
}
</script>
</form>
选择文件
上传文件
函数filenameprint(){
var file1=document.getElementById('file1')。值;
如果(!空(文件1)){
document.getElementById('filename')。innerHTML=file1;
}否则{
document.getElementById('filename').innerHTML=“未选择任何文件”
}
}
Javascript代码:
function uploadCloud() {
//Sets the Progress Bar to 0
_('progress').style.width = "0%";
//Get's the Upload File Button Object Reference
var fileInput = document.getElementsByName("file1[]");
var formData = false;
//Declares the Form Data Object
if (window.FormData) {
formData = new FormData();
}
var file, reader;
console.log((fileInput.files).length);
for (var i = 0; i < fileInput.files.length; i++) {//ERROR COMES FROM HERE!!!
file = fileInput.files[i];
if (window.FileReader) {
reader = new FileReader();
reader.onloaded = function (e) {
}
reader.readAsDataURL(file);
}
if (formData) {
formData.append('file1', file);
}
}
if (formData) {
$.ajax({
url: '/uploadCloud.php', //Server script to process data
type: 'POST',
// Form data
data: formData,
//Options to tell jQuery not to process data or worry about content-type.
cache: false,
contentType: false,
processData: false,
xhr: function () { // Custom XMLHttpRequest
var myXhr = $.ajaxSettings.xhr();
if (myXhr.upload) { // Check if upload property exists
myXhr.upload.addEventListener('progress', progressHandlingFunction, false); // For handling the progress of the upload
}
console.log(myXhr);
return myXhr;
},
beforeSend: function () {
_('uploadfile').setAttribute('disabled', 'disabled');
_('choosefile').setAttribute('disabled', 'disabled');
},
//Ajax events
success: function (data) {
if (data == 0) {
_('loaded').innerHTML = "";
_('progress').style.width = "0%";
_('filename').innerHTML = "<b>No File</b>"
} else {
_("filename").innerHTML = data;
}
_('uploadpercent').innerHTML = "";
_('loaded').innerHTML = "";
_('uploadfile').removeAttribute('disabled');
_('choosefile').removeAttribute('disabled');
_('progress').style.width = "0%";
},
});
function progressHandlingFunction(e) {
if (e.lengthComputable) {
_('progress').style.width = (e.loaded / e.total) * 100 + "%";
_('uploadpercent').innerHTML = Math.round((e.loaded / e.total) * 100) + "% complete (" + _('filename').innerHTML + ")";
_('loaded').innerHTML = "Upload " + Math.round((e.loaded / e.total) * 100) + "% complete [" + e.loaded + " bytes loaded of " + e.total + " bytes total]";
}
}
} else {
_("filename").innerHTML = "<b>No File</b>"
}
}
函数uploadCloud(){
//将进度条设置为0
_('progress')。style.width=“0%”;
//获取上传文件按钮对象引用
var fileInput=document.getElementsByName(“file1[]”);
var formData=false;
//声明表单数据对象
if(window.FormData){
formData=新的formData();
}
var文件,读卡器;
log((fileInput.files).length);
对于(var i=0;i
var fileInput = document.getElementsByName("file1[]");
是一个集合,您的行为就像它是单个元素一样。您需要引用各个元素
fileInput[0].files
我不知道你所说的通行证是什么意思。。你能解释一下吗?我打错了!很抱歉我意识到我不确定问题出在哪里,除了var fileInput=document.getElementsByName(“file1[])代码>看起来有点可疑:)你不需要写一篇博文才能拿到吗?博文?不,我正在使用AJAX首先获取文件,然后服务器通过POST在这一行接收它:console.log((fileInput.files.length)代码>-您得到预期结果了吗?没有。。返回未定义的wait,fileInput[0]也是如此。文件
仅指向一个文件。因为我需要它对多个文件是动态的,所以它将指向单个文件输入元素。如果有多个文件输入,则需要在集合上循环,因此我需要在另一个for()
循环中循环一个for()
循环?是否有多个
元素?如果有,是的……我只有一个
,但是它有multiple属性