The following editor will bring you an example of how to implement asynchronous file upload using native JavaScript. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.
Rendering:
##Code: (demo33.jsp)
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>demo33.jsp</title>
</head>
<body>
<label for="text">名称</label>
<input type="text" id="text" name="name"/>
<label for="file">文件</label>
<input type="file" id="file" name="file"/>
<button type="button" onclick="ajaxUploadFile()">确定</button>
</body>
<script type="text/javascript">
function ajaxUploadFile() {
var formData = new FormData();
var xmlhttp;
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST","/data",true);
xmlhttp.setRequestHeader("X-Requested-With", "XMLHttpRequest");
formData.append("name",document.getElementById("text").value);
formData.append("file",document.getElementById("file").files[0]);
xmlhttp.send(formData);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
if (xmlhttp.status==200) {
console.log("上传成功"+xmlhttp.responseText);
}else {
console.log("上传失败"+xmlhttp.responseText);
}
}
}
}
</script>
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