我有一个包含多个输入的表格。一个输入是文件上传器。我正在使用Cropperjs。很好它产生一个base64 img。我希望能够将此裁剪的预览图像传递到php页面，以与其他发布变量一起处理为ajax formData。我可以通过php中的Submit按钮传递其他$ _POST变量。我如何使图像通过？
对我来说，似乎没有追加到formData上，或者我不是在要求正确的FILES var ...
https://jsfiddle.net/nick1572/c6027thL/6/
HTML
<div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="modalLabel">Crop the image</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="img-container">
<img id="image" src="https://avatars0.githubusercontent.com/u/3456749">
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
<button type="button" class="btn btn-primary" id="crop">Crop</button>
</div>
</div>
</div>
</div>
<!--end modal-->
<div class="file_drop_zone">
<div class="preview">
<img id="preview_image" accept="image/*"><!-- this is the image that needs to be passed.-->
</div><!--end preview-->
<div class="file__controls">
<label for="file_input">
<i class="fa fa-upload download_icon"></i><br>
<span class="drag__files_or">Drag File in or</span>
<span class="choose__file_btn">Choose File</span>
<input type="file" name="file" id="file_input">
</label>
</div>
</div><!--End file_uploader-->
JS
// Set the vars
var drop_zone = document.querySelector('.file_drop_zone');
var input = document.getElementById('file_input');
var image = document.getElementById('image');
var preview_image = document.getElementById('preview_image');
var preview_wrapper = document.querySelector('.preview');
var $modal = $('#modal');
var cropper;
var $submit = $('.seminar_form_submit');
var $event_form = $('.seminar_event_form');
// Create a function to read the file upload
// provided by the user.
function readFile(event) {
var url;
// File passed to FileList
var file = event.target;
// create a variable to pass in the the url.
// In this case it is the reader result. Then
// show the bootstrap modal.
var done = function (url) {
input.value = '';
image.src = url;
$modal.modal('show');
};
// Create a new File Reader instance
// for getting the result
var reader = new FileReader();
reader.onload = function() {
done(reader.result);
};
// If the event type is a 'change' then grab the
// file otherwise if the file is a 'drop'
// we get the file through the dataTransfer
if (event.type === 'change') {
reader.readAsDataURL(file.files[0]);
console.log(file.files[0]);
} else if (event.type === 'drop') {
reader.readAsDataURL(event.dataTransfer.files[0]);
}
}
// Once the modal is shown, create a new cropper instance and
// assign it to the #image div. // Once the modal is hidden
// destroy the instance for resetting cropper.
$modal.on('shown.bs.modal', function () {
/* global Cropper */
cropper = new Cropper(image, {
aspectRatio: 1,
viewMode: 0,
zoomable: true,
cropBoxMovable: true,
minContainerWidth: 100,
minContainerHeight: 100,
autoCropArea: 0.5
});
}).on('hidden.bs.modal', function () {
cropper.destroy();
cropper = null;
});
// Add listener to the crop button on the modal. If there is a cropper
// instance then set the canvas to the getCroppedCanvas function
// provided by cropperjs. We can set the dims there. We want to set the initial
// preview image src to the canvas. This is now a string in the form of
// a base64. Then hide the modal.
var crop = document.getElementById('crop');
var canvas;
var initialPreviewURL;
crop.addEventListener('click', function (crop) {
canvas = cropper.getCroppedCanvas({
width: 180,
height: 180,
fillColor: '#fff',
imageSmoothingEnabled: false,
imageSmoothingQuality: 'high'
});
initialPreviewURL = preview_image.src;
preview_image.src = canvas.toDataURL();
preview_wrapper.style.display = 'block';
$modal.modal('hide');
});
$event_form.on('submit', function(e) {
e.stopPropagation();
e.preventDefault();
var form_data = new FormData(document.getElementById('my_form'));
canvas.toBlob(function(blob) {
form_data.append('preview_image', blob);
for (var key of form_data.entries()) {
console.log(key);
}
});
$.ajax({
url: 'create_event.php',
data: form_data,
cache: false,
processData: false,
contentType: false,
type: 'POST',
success: function() {
console.log('success');
},
error: function () {
preview_image.src = initialPreviewURL;
},
complete: function () {
console.log('completed');
}
});
});
我能够在控制台中看到输出。通过在条目上使用for循环
["preview_image", File]
如果我在php上error_log。输出仅显示“此处错误”，不显示预览图像
error_log("error here");
error_log($_FILES['preview_image']);
这是php页面上“网络”>“响应”选项卡的输出。
var_dump（$ _ POST）;或var_dump（$ _ FILES）;
array(9) {
["subject"]=>
string(12) "Persons Name"
["details"]=>
string(39) "Designer and wanna be web developer...."
["event-title"]=>
string(21) "This is another title"
["location"]=>
string(58) "This place"
["aux"]=>
string(13) "George Carlin"
["start-date"]=>
string(10) "2019-10-18"
["start-time"]=>
string(5) "08:00"
["end-date"]=>
string(10) "2019-10-18"
["end-time"]=>
string(5) "09:00"
}
array(1) {
["file"]=>
array(5) {
["name"]=>
string(0) ""
["type"]=>
string(0) ""
["tmp_name"]=>
string(0) ""
["error"]=>
int(4)
["size"]=>
int(0)
}
谢谢！
答案 0 :(得分：0)
好几天后，我只添加了一个隐藏字段并将该值设置为base64字符串。我已经有大量的PHP错误处理脚本，因此我删除了ajax调用。现在，base64字符串与POST数组一起传递。