我可以使用以下jQuery代码使用ajax请求的POST方法执行文件上载吗?
$.ajax({
type: "POST",
timeout: 50000,
url: url,
data: dataString,
success: function (data) {
alert('success');
return false;
}
});
如果可能,我需要填写数据部分吗?这是正确的方式吗?我只将文件POST到服务器端。
我一直在搜索,但我发现的是一个插件,而在我的计划中,我不想使用它。至少目前是这样。
Ajax发布和上传文件是可能的。我使用jQuery$.ajax函数加载文件。我尝试使用XHR对象,但无法在服务器端使用PHP获得结果。
var formData = new FormData();
formData.append('file', $('#file')[0].files[0]);
$.ajax({
url : 'upload.php',
type : 'POST',
data : formData,
processData: false, // tell jQuery not to process the data
contentType: false, // tell jQuery not to set contentType
success : function(data) {
console.log(data);
alert(data);
}
});
如您所见,您必须创建一个FormData对象,该对象为空或来自(serialized?-$('#yourForm').serialize())现有表单,然后附加输入文件。
以下是更多信息:-如何使用jQuery.ajax和FormData上载文件-通过jQuery上载文件,提供对象FormData,没有文件名,GET请求
对于PHP进程,您可以使用以下内容:
//print_r($_FILES);
$fileName = $_FILES['file']['name'];
$fileType = $_FILES['file']['type'];
$fileError = $_FILES['file']['error'];
$fileContent = file_get_contents($_FILES['file']['tmp_name']);
if($fileError == UPLOAD_ERR_OK){
//Processes your file here
}else{
switch($fileError){
case UPLOAD_ERR_INI_SIZE:
$message = 'Error al intentar subir un archivo que excede el tamaño permitido.';
break;
case UPLOAD_ERR_FORM_SIZE:
$message = 'Error al intentar subir un archivo que excede el tamaño permitido.';
break;
case UPLOAD_ERR_PARTIAL:
$message = 'Error: no terminó la acción de subir el archivo.';
break;
case UPLOAD_ERR_NO_FILE:
$message = 'Error: ningún archivo fue subido.';
break;
case UPLOAD_ERR_NO_TMP_DIR:
$message = 'Error: servidor no configurado para carga de archivos.';
break;
case UPLOAD_ERR_CANT_WRITE:
$message= 'Error: posible falla al grabar el archivo.';
break;
case UPLOAD_ERR_EXTENSION:
$message = 'Error: carga de archivo no completada.';
break;
default: $message = 'Error: carga de archivo no completada.';
break;
}
echo json_encode(array(
'error' => true,
'message' => $message
));
}
如果你想使用AJAX上传文件,这里是可以用于文件上传的代码。
$(document).ready(function() {
var options = {
beforeSubmit: showRequest,
success: showResponse,
dataType: 'json'
};
$('body').delegate('#image','change', function(){
$('#upload').ajaxForm(options).submit();
});
});
function showRequest(formData, jqForm, options) {
$("#validation-errors").hide().empty();
$("#output").css('display','none');
return true;
}
function showResponse(response, statusText, xhr, $form) {
if(response.success == false)
{
var arr = response.errors;
$.each(arr, function(index, value)
{
if (value.length != 0)
{
$("#validation-errors").append('<div class="alert alert-error"><strong>'+ value +'</strong><div>');
}
});
$("#validation-errors").show();
} else {
$("#output").html("<img src='"+response.file+"' />");
$("#output").css('display','block');
}
}
这是用于上载文件的HTML
<form class="form-horizontal" id="upload" enctype="multipart/form-data" method="post" action="upload/image'" autocomplete="off">
<input type="file" name="image" id="image" />
</form>
我已经很晚了,但我正在寻找一个基于ajax的图像上传解决方案,我正在寻找的答案在这篇文章中有点分散。我确定的解决方案涉及FormData对象。我组装了一个基本形式的代码。您可以看到它演示了如何使用fd.append()向表单添加自定义字段,以及如何在完成ajax请求时处理响应数据。
上传html:
<!DOCTYPE html>
<html>
<head>
<title>Image Upload Form</title>
<script src="//code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
function submitForm() {
console.log("submit event");
var fd = new FormData(document.getElementById("fileinfo"));
fd.append("label", "WEBUPLOAD");
$.ajax({
url: "upload.php",
type: "POST",
data: fd,
processData: false, // tell jQuery not to process the data
contentType: false // tell jQuery not to set contentType
}).done(function( data ) {
console.log("PHP Output:");
console.log( data );
});
return false;
}
</script>
</head>
<body>
<form method="post" id="fileinfo" name="fileinfo" onsubmit="return submitForm();">
<label>Select a file:</label><br>
<input type="file" name="file" required />
<input type="submit" value="Upload" />
</form>
<div id="output"></div>
</body>
</html>
如果您使用php,这里有一种处理上传的方法,包括使用上面html中演示的两个自定义字段。
上传.php
<?php
if ($_POST["label"]) {
$label = $_POST["label"];
}
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& ($_FILES["file"]["size"] < 200000)
&& in_array($extension, $allowedExts)) {
if ($_FILES["file"]["error"] > 0) {
echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
} else {
$filename = $label.$_FILES["file"]["name"];
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";
if (file_exists("uploads/" . $filename)) {
echo $filename . " already exists. ";
} else {
move_uploaded_file($_FILES["file"]["tmp_name"],
"uploads/" . $filename);
echo "Stored in: " . "uploads/" . $filename;
}
}
} else {
echo "Invalid file";
}
?>
<html>
<head>
<title>Ajax file upload</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function (e) {
$("#uploadimage").on('submit', (function(e) {
e.preventDefault();
$.ajax({
url: "upload.php", // Url to which the request is send
type: "POST", // Type of request to be send, called as method
data: new FormData(this), // Data sent to server, a set of key/value pairs (i.e. form fields and values)
contentType: false, // The content type used when sending data to the server.
cache: false, // To unable request pages to be cached
processData:false, // To send DOMDocument or non processed data file it is set to false
success: function(data) // A function to be called if request succeeds
{
alert(data);
}
});
}));
</script>
</head>
<body>
<div class="main">
<h1>Ajax Image Upload</h1><br/>
<hr>
<form id="uploadimage" action="" method="post" enctype="multipart/form-data">
<div id="image_preview"><img id="previewing" src="noimage.png" /></div>
<hr id="line">
<div id="selectImage">
<label>Select Your Image</label><br/>
<input type="file" name="file" id="file" required />
<input type="submit" value="Upload" class="submit" />
</div>
</form>
</div>
</body>
</html>