我正在开发一个文件上传器,当输入框改变时上传图片,我的HTML表单代码如下:
<form method="post" enctype="multipart/form-data">
<input name="uploaded[]" type="file" id="file_upload"/>
</form>
我的JavaScript和Ajax:
document.getElementById("file_upload").onchange = function() {
var id = document.getElementById("user_id").innerHTML;
var file = document.getElementById("file_upload").files[0];
alert(file.size);
var formdata = new FormData();
formdata.append("filer",file,true);
var ajax = new XMLHttpRequest();
ajax.onreadystatechange =
function(){
if(ajax.readyState==4 && ajax.status==200){
document.getElementById("one").remove();
var img = document.createElement('img');
var first_path = '/user_image/';
var path = first_path.concat(id,'.png');
img.setAttribute('alt','User image');
img.setAttribute('id','one');
img.setAttribute('src',path);
document.getElementById("user").appendChild(img);
alert("end");
}
else{
document.getElementById("one").remove();
var img = document.createElement('img');
img.setAttribute('src','/img/loading.gif');
img.setAttribute('alt','User image');
img.setAttribute('id','one');
document.getElementById("user").appendChild(img);
}
}
ajax.open("POST","upload_image.php");
ajax.setRequestHeader("Content-Type", "multipart/form-data");
ajax.send(formdata);
};
我的PHP代码很简单,只是为了测试是否一切正常。
require("../includes/config.php"); //config folder to start the session
if($_SERVER["REQUEST_METHOD"]=="POST"){
echo '<pre>',print_r($_FILES),'</pre>'; //dumping some variable and arrays to see where the problem is
}
我从服务器得到的请求是:Warning: Missing boundary in multipart/form-data POST data in Unknown on line 0。但是我已经发送了表单数据和请求头,并打开了文件。