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。
当前回答
我用简单的代码处理了这些问题。您可以从这里下载工作演示
就你的情况而言，这些都是可能的。我将逐步介绍如何使用AJAX jquery将文件上传到服务器。
首先让我们创建一个HTML文件，添加如下表单文件元素，如下所示。
<form action="" id="formContent" method="post" enctype="multipart/form-data" >
<input type="file" name="file" required id="upload">
<button class="submitI" >Upload Image</button>
</form>
其次，创建一个jquery.js文件，并添加以下代码来处理向服务器提交的文件
$("#formContent").submit(function(e){
e.preventDefault();
var formdata = new FormData(this);
$.ajax({
url: "ajax_upload_image.php",
type: "POST",
data: formdata,
mimeTypes:"multipart/form-data",
contentType: false,
cache: false,
processData: false,
success: function(){
alert("file successfully submitted");
},error: function(){
alert("okey");
}
});
});
});
你完成了。查看更多信息
其他回答
使用XMLHttpRequest（）确实可以进行AJAX上载。无需iframes。可以显示上载进度。
有关详细信息，请参阅：答案https://stackoverflow.com/a/4943774/873282对jQuery Upload Progress和AJAX文件上传提出质疑。
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";
}
?>
在通过ajax从预览中删除不需要的文件后，我实现了一个即时预览和上传的多文件选择。
详细文档可在以下位置找到：http://anasthecoder.blogspot.ae/2014/12/multi-file-select-preview-without.html
演示：http://jsfiddle.net/anas/6v8Kz/7/embedded/result/
jsFiddle：http://jsfiddle.net/anas/6v8Kz/7/
Java脚本：
$(document).ready(function(){
$('form').submit(function(ev){
$('.overlay').show();
$(window).scrollTop(0);
return upload_images_selected(ev, ev.target);
})
})
function add_new_file_uploader(addBtn) {
var currentRow = $(addBtn).parent().parent();
var newRow = $(currentRow).clone();
$(newRow).find('.previewImage, .imagePreviewTable').hide();
$(newRow).find('.removeButton').show();
$(newRow).find('table.imagePreviewTable').find('tr').remove();
$(newRow).find('input.multipleImageFileInput').val('');
$(addBtn).parent().parent().parent().append(newRow);
}
function remove_file_uploader(removeBtn) {
$(removeBtn).parent().parent().remove();
}
function show_image_preview(file_selector) {
//files selected using current file selector
var files = file_selector.files;
//Container of image previews
var imageContainer = $(file_selector).next('table.imagePreviewTable');
//Number of images selected
var number_of_images = files.length;
//Build image preview row
var imagePreviewRow = $('<tr class="imagePreviewRow_0"><td valign=top style="width: 510px;"></td>' +
'<td valign=top><input type="button" value="X" title="Remove Image" class="removeImageButton" imageIndex="0" onclick="remove_selected_image(this)" /></td>' +
'</tr> ');
//Add image preview row
$(imageContainer).html(imagePreviewRow);
if (number_of_images > 1) {
for (var i =1; i<number_of_images; i++) {
/**
*Generate class name of the respective image container appending index of selected images,
*sothat we can match images selected and the one which is previewed
*/
var newImagePreviewRow = $(imagePreviewRow).clone().removeClass('imagePreviewRow_0').addClass('imagePreviewRow_'+i);
$(newImagePreviewRow).find('input[type="button"]').attr('imageIndex', i);
$(imageContainer).append(newImagePreviewRow);
}
}
for (var i = 0; i < files.length; i++) {
var file = files[i];
/**
* Allow only images
*/
var imageType = /image.*/;
if (!file.type.match(imageType)) {
continue;
}
/**
* Create an image dom object dynamically
*/
var img = document.createElement("img");
/**
* Get preview area of the image
*/
var preview = $(imageContainer).find('tr.imagePreviewRow_'+i).find('td:first');
/**
* Append preview of selected image to the corresponding container
*/
preview.append(img);
/**
* Set style of appended preview(Can be done via css also)
*/
preview.find('img').addClass('previewImage').css({'max-width': '500px', 'max-height': '500px'});
/**
* Initialize file reader
*/
var reader = new FileReader();
/**
* Onload event of file reader assign target image to the preview
*/
reader.onload = (function(aImg) { return function(e) { aImg.src = e.target.result; }; })(img);
/**
* Initiate read
*/
reader.readAsDataURL(file);
}
/**
* Show preview
*/
$(imageContainer).show();
}
function remove_selected_image(close_button)
{
/**
* Remove this image from preview
*/
var imageIndex = $(close_button).attr('imageindex');
$(close_button).parents('.imagePreviewRow_' + imageIndex).remove();
}
function upload_images_selected(event, formObj)
{
event.preventDefault();
//Get number of images
var imageCount = $('.previewImage').length;
//Get all multi select inputs
var fileInputs = document.querySelectorAll('.multipleImageFileInput');
//Url where the image is to be uploaded
var url= "/upload-directory/";
//Get number of inputs
var number_of_inputs = $(fileInputs).length;
var inputCount = 0;
//Iterate through each file selector input
$(fileInputs).each(function(index, input){
fileList = input.files;
// Create a new FormData object.
var formData = new FormData();
//Extra parameters can be added to the form data object
formData.append('bulk_upload', '1');
formData.append('username', $('input[name="username"]').val());
//Iterate throug each images selected by each file selector and find if the image is present in the preview
for (var i = 0; i < fileList.length; i++) {
if ($(input).next('.imagePreviewTable').find('.imagePreviewRow_'+i).length != 0) {
var file = fileList[i];
// Check the file type.
if (!file.type.match('image.*')) {
continue;
}
// Add the file to the request.
formData.append('image_uploader_multiple[' +(inputCount++)+ ']', file, file.name);
}
}
// Set up the request.
var xhr = new XMLHttpRequest();
xhr.open('POST', url, true);
xhr.onload = function () {
if (xhr.status === 200) {
var jsonResponse = JSON.parse(xhr.responseText);
if (jsonResponse.status == 1) {
$(jsonResponse.file_info).each(function(){
//Iterate through response and find data corresponding to each file uploaded
var uploaded_file_name = this.original;
var saved_file_name = this.target;
var file_name_input = '<input type="hidden" class="image_name" name="image_names[]" value="' +saved_file_name+ '" />';
file_info_container.append(file_name_input);
imageCount--;
})
//Decrement count of inputs to find all images selected by all multi select are uploaded
number_of_inputs--;
if(number_of_inputs == 0) {
//All images selected by each file selector is uploaded
//Do necessary acteion post upload
$('.overlay').hide();
}
} else {
if (typeof jsonResponse.error_field_name != 'undefined') {
//Do appropriate error action
} else {
alert(jsonResponse.message);
}
$('.overlay').hide();
event.preventDefault();
return false;
}
} else {
/*alert('Something went wrong!');*/
$('.overlay').hide();
event.preventDefault();
}
};
xhr.send(formData);
})
return false;
}
您可以使用ajaxSubmit方法，如下所示：）当您选择需要上传到服务器的文件时，表单将提交到服务器：）
$(document).ready(function () {
var options = {
target: '#output', // target element(s) to be updated with server response
timeout: 30000,
error: function (jqXHR, textStatus) {
$('#output').html('have any error');
return false;
}
},
success: afterSuccess, // post-submit callback
resetForm: true
// reset the form after successful submit
};
$('#idOfInputFile').on('change', function () {
$('#idOfForm').ajaxSubmit(options);
// always return false to prevent standard browser submit and page navigation
return false;
});
});
如果你想这样做：
$.upload( form.action, new FormData( myForm))
.progress( function( progressEvent, upload) {
if( progressEvent.lengthComputable) {
var percent = Math.round( progressEvent.loaded * 100 / progressEvent.total) + '%';
if( upload) {
console.log( percent + ' uploaded');
} else {
console.log( percent + ' downloaded');
}
}
})
.done( function() {
console.log( 'Finished upload');
});
比
https://github.com/lgersman/jquery.orangevolt-ampere/blob/master/src/jquery.upload.js
可能是您的解决方案。
