如何使用JQuery异步上传文件 [英] how to Upload file asynchronously using JQuery
问题描述
我想使用jQuery异步上传文件-不使用任何插件.
I want to upload a file asynchronously using jQuery - without using any PLUGIN.
JQuery对我来说是一个非常新的东西，在浏览了各种论坛之后，我最终得到了以下代码:
JQuery is very new to me and after looking at various forums I ended up with this code :
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8">
$(document).ready(function(){
$('#myform').submit(function() {
var fileInput = document.getElementById('file');
var file = fileInput.files[0];
var formData = new FormData();
formData.append('file', file);
$.ajax({
type: "POST",
url: "upload.php",
data: formData,
processData: false,
contentType: 'multipart/form-data',
beforeSend: function (x) {
if (x && x.overrideMimeType) {
x.overrideMimeType("multipart/form-data");
}
},
success:function(msg){
//alert( "Data Uploaded: " + msg );
document.getElementById('display').innerHTML = msg;
}
});
return false;
});
});
</script>
</head>
<body>
<form enctype="multipart/form-data" id="myform" name="myform" method="POST">
<input name="file" type="file" id="file" name="file"/>
<input type="text" name="txtValue" value="" id="txtValue">-->
<input type="submit" value="Upload" id="button" name="button"/>
<div id="display"></div>
</form>
</body>
</html>
PHP:
<?php
$uploaddir = './uploads/';
$file = $uploaddir . basename($_FILES['file']['name']);
if (move_uploaded_file($_FILES['file']['tmp_name'], $file)) {
$value = "success";
}
else {
$value = "error";
}
echo $value;
?>
此代码不起作用，并且每次显示" DIV打印错误"时.请帮帮我.
This code is not working and everytime the "display" DIV is printing "error". Please help me out.
推荐答案
使用 HTML5 您可以使用Ajax和jQuery上传文件.不仅如此，您还可以执行文件验证(名称，大小和MIME类型)或使用HTML5进度标签(或div)处理进度事件.
With HTML5 you can make file uploads with Ajax and jQuery. Not only that, you can do file validations (name, size, and MIME-type) or handle the progress event with the HTML5 progress tag (or a div).
HTML:
<form enctype="multipart/form-data">
<input name="file" type="file" />
<input type="button" value="Upload" />
</form>
<progress></progress>
如果需要，您可以进行一些验证.
You can do some validation if you want.
$(':file').change(function(){
var file = this.files[0];
var name = file.name;
var size = file.size;
var type = file.type;
//Your validation
});
现在单击按钮即可向Ajax提交:
Now the Ajax submit with the button's click:
$(':button').click(function(){
var formData = new FormData($('form')[0]);
$.ajax({
url: 'upload.php', //Server script to process data
type: 'POST',
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
}
return myXhr;
},
//Ajax events
beforeSend: beforeSendHandler,
success: completeHandler,
error: errorHandler,
// Form data
data: formData,
//Options to tell jQuery not to process data or worry about content-type.
cache: false,
contentType: false,
processData: false
});
});
现在，如果您要处理进度.
Now if you want to handle the progress.
function progressHandlingFunction(e){
if(e.lengthComputable){
$('progress').attr({value:e.loaded,max:e.total});
}
}
这篇关于如何使用JQuery异步上传文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
