AJAX（jQuery的）最简单的版本上载只有一个文件 [英] The simplest version of ajax (jQuery) to upload just one file
本文介绍了AJAX（jQuery的）最简单的版本上载只有一个文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我只希望用户选择一个文件，它会自动将其下载到我的服务器。我不需要任何更多的功能。什么是最简单，最reliabe（也许你用过吗？）插件来做到这一点？尝试 https://github.com/valums/file-uploader ，但不能把它工作
I just want user to select a file and it would automatically download it to my server. I don't need no more features. What is the simplest and most reliabe (maybe you used it?) plugin to do that? Tried https://github.com/valums/file-uploader , but couldn't get it to work.
推荐答案
这是一个网页，如：upload.html
from a web page such as: upload.html
<html>
<head>
<script type="text/javascript">
function uploadFile(){
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");
}
var formElement = document.getElementById("upload");
var formData= new FormData(formElement);
xmlhttp.open("post","upload.php",false);
xmlhttp.send(formData);
var counter = 0;
while (xmlhttp.readyState != 4){
counter = counter + 1;
}
var errorCondition = xmlhttp.responseText;
if(errorCondition == "success"){
alert("File uploaded successfully");
}
else{
alert("Error: "+errorCondition);
}
}
</script>
</head>
<body>
<form id="upload" action="upload_file.php" method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" />
<br />
<input type="button" name="submit" value="Submit" onclick="uploadFile();" />
</form>
</body>
</html>
这是调用PHP像这样：upload..php
that calls php such as this: upload..php
<?php
if ($_FILES["file"]["error"] > 0)
{
echo ($_FILES["file"]["error"]);
}
else
{
if (file_exists("upload/" . $_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "success";
}
}
?>
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