这是我的代码 - 我想上传图片文件并在图片div中显示。 当我选择一个文件时,我想触发用js编写的ajax代码。它应该将文件上传到服务器并显示它而不需要任何其他事件。 但是这段代码不起作用。它显示未定义的索引图像,而不是图像。
HTML表格
<!doctype html>
<html>
<body>
<div id="wb_Image2>
<img src="" id="Image2" alt="">
</div>
<input type="file" id="FileUpload1" name="image" onchange="upload()" >
<div id="div"> </div>
</body>
</html>
JS FILE -
function upload()
{
var xhttp = new XMLHttpRequest(); //creating a xmlhttp request;
xhttp.open("POST","upload.php", true);
xhttp.send();
xhttp.onreadystatechange = function ()
{
if (xhttp.readyState == 4 && xhttp.status == 200)
{
alert(xhttp.responseText);
document.getElementById("div").innerHTML= xhttp.responseText;
document.getElementById("Image2").src = xhttp.responseText;
}
};
}
PHP file-upload.php
<?php
$errors=array();
$name=$_FILES['image']['name']; //storing name of d file
$ext=explode('.',$name); //ext[0]=nameOfFile and ext[1]= extension
$size=$_FILES['image']['size'];//storing size
$tmpName=$_FILES['image']['tmp_name'];//storing temp name
$validExt=array("jpg","jpeg","png","gif");//valid extensions
if(($size/(1024*1024))>2) //checking file size is less than 2mb or not
{
$errors[]="file size exceeds 2 mb";
echo "file size exceeds 2 mb";
}
if(empty($errors))
{
echo $ext[0]." ".$ext[1];
$newFilename = $ext[0].substr(session_id(),0,5).rand(0,1000).".".$ext[1];
move_uploaded_file($tmpName,"upload/".$newFilename);
}
else {
echo 'flag 1';
}
?>
答案 0 :(得分:0)
在javascript
,您可以将.responseType
设置为"blob"
,使用URL.createObjectURL()
function upload() {
var file = document.getElementById("FileUpload1").files[0];
var data = new FormData();
data.append("image", file);
var xhttp = new XMLHttpRequest(); //creating a xmlhttp request;
xhttp.open("POST", "upload.php", true);
xhttp.responseType = "blob";
xhttp.send(data);
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
// alert(xhttp.responseText);
// document.getElementById("div").innerHTML = xhttp.responseText;
document.getElementById("Image2").src = URL.createObjectURL(xhttp.response);
}
};
}
在php使用file_get_contents()
echo file_get_contents("upload/" . $newFilename);