我被要求只使用Javascript（Ajax/Jquery/JSON）。为什么这不起作用？
这是我嵌入在 HTML 脚本中的代码：
function uploadImage(){
$.post("signup/upload.php", function(data)
{
if(data['status']!='ok'){
$("#status").html(data['status']);
console.log("!Failure");
}else{
$('#status').html("Your picture was uploaded!");
console.log("Success");
}
});
}
$(document).ready(function () {
$('#uploadImageButton').on('click', function()
{
uploadImage();
});
});
这是 HTML：
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Submit" id = "uploadImageButton" name="submit">
这是 PHP：
$reply['status'] = 'ok';
<?php
if(isset($_POST['submit'])) {
if (isset($_FILES['upload'])) {
$allowed = array ('image/pjpeg', 'image/jpeg','image/JPG');
if (in_array($_FILES['upload']['type'], $allowed)) {
if (move_uploaded_file
($_FILES['upload']['tmp_name'], "/fakepath/www/upload_files/{$_FILES['upload']['name']}"))
{
$reply['status'] = 'ok';
echo '<p><em>The file has been uploaded!</em></p>';
}
} else {
echo '<p class="error">Please upload a JPEG or PNG image.</p>';
}
}
}
print json_encode($reply);
?>
你应该使用$.ajax请求，例如下面。
.HTML：
<form enctype="multipart/form-data">
<input type="file" name="upload" id="fileToUpload">
<input type="submit" value="Submit" id = "uploadImageButton" name="submit">
<form>
.JS：
$(function(){
$('body').on('submit', 'form', function(e){
e.preventDefault();
$.ajax({
type: "POST",
url: "signup/upload.php",
data: new FormData(this),
cache: false,
contentType: false,
processData: false,
success: function (data) {
//your code
}
});
return false;
})
})
希望这有帮助。
第一个PHP指令$reply['status'] = 'ok';不会执行，因为它被放置在PHP打开标签之前。