问题描述:

通过jQuery异步上传文件,这是HTML:

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<span>File</span>
<input type="file" id="file" name="file" size="10"/>
<input id="uploadbutton" type="button" value="Upload"/>

JavaScript代码:

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$(document).ready(function () {
$("#uploadbutton").click(function () {
var filename = $("#file").val();

$.ajax({
type: "POST",
url: "addFile.do",
enctype: 'multipart/form-data',
data: {
file: filename
},
success: function () {
alert("Data Uploaded: ");
}
});
});
});

以上方法只能得到上传的文件名,怎么办?

&nbsp;

解决办法1:

直接通过jQuery Form插件来解决这个问题:http://malsup.com/jquery/form/#code-samples,相关的API、Options对象可以自行查阅官网;

解决办法2:

采用HTML5,用jQuery,Ajax实现文件上传,不仅如此,你可以做文件验证(名称,大小,MIME类型)或利用HTML5的进度标签(或者div)处理进度事件;
HTML代码:

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<form enctype="multipart/form-data">
<input name="file" type="file" />
<input type="button" value="Upload" />
</form>
<progress></progress>

首先,你可以做一些验证,例如文件的onChange事件:

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$(':file').change(function(){
var file = this.files[0];
name = file.name;
size = file.size;
type = file.type;
//your validation
});

按钮点击触发Ajax:

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$(':button').click(function(){
var formData = new FormData($('form')[0]);
$.ajax({
url: 'upload.php', //server script to process data
type: 'POST',
xhr: function() { // custom xhr
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事件
beforeSend: beforeSendHandler,
success: completeHandler,
error: errorHandler,
// Form数据
data: formData,
//Options to tell JQuery not to process data or worry about content-type
cache: false,
contentType: false,
processData: false
});
});

处理进度:

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function progressHandlingFunction(e){
if(e.lengthComputable){
$('progress').attr({value:e.loaded,max:e.total});
}
}