通过jQuery和FormData的Ajax POST请求-$ _POST在PHP上为空 [英] Ajax POST request via jQuery and FormData - $_POST empty on PHP
问题描述
我希望使用jQuery和FormData通过ajax将图像上传到服务器.
I wish to upload an image to the server via ajax using jQuery and FormData.
我的jQuery代码如下
My jQuery code is as follows
var formData = new FormData("form")[0];
var fileName = $("#InputLogo")[0].files[0].name;
$.ajax ( {
url : 'upload.php',
type : 'POST',
data : { "data" : formData, "fileName" : fileName },
processData : false,
success : function(data) {
console.log(data);
alert(data);
}
});
当用户选择要上传的新文件时,将调用此代码.
This code is called when the user selects a new file to upload.
MY服务器后端是PHP,它按如下方式处理请求
MY server backend is PHP and it handles the request as follows
$data = $_POST['data'];
$fileName = $_POST['fileName'];
$fp = fopen('/img/'.$fileName, 'w');
fwrite($fp, $data);
fclose($fp);
$returnData = array("data" => $data);
print_r($_POST);
确实发生了POST请求,但 $ _ POST 仍然为空.
The POST request does occur, but $_POST remains empty.
我尝试搜索解决方案,但找不到确切的解决方案.
I tried searching for the solution but couldn't find an exact one.
任何建议将不胜感激.
这是HTML表单
<form id=card-form" method="post" action="" >
<div class="form-group">
<label for="InputName">Name of the Company</label>
<input type="text" class="form-control" id="InputName" placeholder="Enter a name">
</div>
<div class="form-group">
<label for="InputEmail">Email</label>
<input type="email" class="form-control" id="InputEmail" placeholder="Enter email">
</div>
<div class="form-group">
<label for="InputLogo">Choose a company logo</label>
<input type="file" id="InputLogo" accept="image/*">
<p class="help-block">For good visibility, please limit the image to 200 x 200 px</p>
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
推荐答案
FormData()
构造函数不是选择器引擎,也不表示类似数组的集合,因此var formData
可能等于undefined
.
要使用它,您必须先找到<form>
并将其传递给构造函数:
To use it, you'll have to find the <form>
first and pass it to the constructor:
var form = $('form')[0];
var formData = new FormData(form);
如果<input type="file">
在<form>
内,则它应该已经包含在formData
中.但是,如果不是这样,您也可以 .append()
它:
If the <input type="file">
is within the <form>
, it should already be included in formData
. But, if it isn't, you can also .append()
it:
var inputLogo = $("#InputLogo")[0];
formData.append(inputLogo.name, inputLogo.files[0]);
然后,将formData
设置为要发送的data
,告诉jQuery不要为此假设contentType
:
And, set formData
as the data
being sent, telling jQuery not to assume a contentType
for it:
// ...
data : formData,
contentType : false,
processData : false,
// ...
然后,fileSize
应该在PHP的 $_FILES
集合中可用:
Then, the fileSize
should be available in PHP's $_FILES
collection:
$fileName = $_FILES['inputLogo']['name'];
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