dropzone.js应用java_javascript-如何使用Dropzone.js向您显示已存储在服务器上的文件...
javascript-如何使用Dropzone.js向您显示已存储在服务器上的文件
我不明白... call其始终未定义
创建模拟文件：
var mockFile = { name: "Filename", size: 12345 };
调用默认的addedfile事件处理程序
myDropzone.options.addedfile.call(myDropzone, mockFile);
并且可以选择显示文件的缩略图：
myDropzone.options. thumbnail.call(myDropzone, mockFile, "/image/url");
9个解决方案
44 votes
终于!!
$(function() {
var mockFile = { name: "banner2.jpg", size: 12345 };
var myDropzone = new Dropzone("#my-awesome-dropzone");
myDropzone.options.addedfile.call(myDropzone, mockFile);
myDropzone.options.thumbnail.call(myDropzone, mockFile, "http://localhost/test/drop/uploads/banner2.jpg");
})
Marcogomesr answered 2019-12-27T05:40:15Z
34 votes
您也可以使用以下代码：
Dropzone.options.myAwesomeDropzone = false;
Dropzone.autoDiscover = false;
$("#image").dropzone({
url: "http://someserver.com/upload.php",
paramName: "image", // The name that will be used to transfer the file
maxFilesize: 2, // MB
maxFiles: 5,
parallelUploads: 5,
addRemoveLinks: true,
dictMaxFilesExceeded: "You can only upload upto 5 images",
dictRemoveFile: "Delete",
dictCancelUploadConfirmation: "Are you sure to cancel upload?",
accept: function (file, done) {
console.log(file)
if ((file.type).toLowerCase() != "image/jpg" &&
(file.type).toLowerCase() != "image/gif" &&
(file.type).toLowerCase() != "image/jpeg" &&
(file.type).toLowerCase() != "image/png"
) {
done("Invalid file");
}
else {
done();
}
},
init: function () {
var mockFile = { name: "myimage.jpg", size: 12345, type: 'image/jpeg' };
this.addFile.call(this, mockFile);
this.options.thumbnail.call(this, mockFile, "http://someserver.com/myimage.jpg");
}
});
编辑
由于Dropzone 4.0的更新init函数可以称为：
init: function () {
var mockFile = { name: "myimage.jpg", size: 12345, type: 'image/jpeg' };
this.options.addedfile.call(this, mockFile);
this.options.thumbnail.call(this, mockFile, "http://someserver.com/myimage.jpg");
mockFile.previewElement.classList.add('dz-success');
mockFile.previewElement.classList.add('dz-complete');
}
Vicky Gonsalves answered 2019-12-27T05:40:44Z
17 votes
我的解决方案> = 4.0，基于“如何显示已经存储在服务器上的文件”：[https://github.com/enyo/dropzone/wiki/FAQ]
maxFiles: 1,
init: function () {
this.on('maxfilesexceeded', function (file) {
this.removeAllFiles();
this.addFile(file);
});
var mocks = $dropzone.data('dropzone');
for (var i = 0; i < mocks.length; i++) {
var mock = mocks[i];
mock.accepted = true;
this.files.push(mock);
this.emit('addedfile', mock);
this.createThumbnailFromUrl(mock, mock.url);
this.emit('complete', mock);
}
}
punky answered 2019-12-27T05:41:04Z
6 votes
基于以上punky的出色回答，您不应忘记在最后添加this._updateMaxFilesReachedClass();，如下所示：
init: function () {
var mockFile = { name: , size: , type: , url: };
this.files.push(mockFile);
this.emit('addedfile', mockFile);
this.createThumbnailFromUrl(mockFile, mockFile.url);
this.emit('complete', mockFile);
this._updateMaxFilesReachedClass();
}
Oded Davidov answered 2019-12-27T05:41:24Z
5 votes
在此答案中，[https://stackoverflow.com/a/17763511]通过执行缩略图事件来实现。
以下是使用createThumbnailFromUrl进行操作的示例。
HTML元素；
JS代码；
previewThumbailFromUrl({
selector: 'sample-img',
fileName: 'sampleImg',
imageURL: '/images/sample.png'
});
function previewThumbailFromUrl(opts) {
var imgDropzone = Dropzone.forElement("#" + opts.selector);
var mockFile = {
name: opts.fileName,
size: 12345,
accepted: true,
kind: 'image'
};
imgDropzone.emit("addedfile", mockFile);
imgDropzone.files.push(mockFile);
imgDropzone.createThumbnailFromUrl(mockFile, opts.imageURL, function() {
imgDropzone.emit("complete", mockFile);
});
}
JSFiddle上的工作样本：
将图片加载到同一域
使用crossOrigin加载图像
gihanchanuka answered 2019-12-27T05:42:10Z
0 votes
我也很难过。 以此为起点可以帮助更多：
Dropzone.autoDiscover = false; // otherwise will be initialized twice
var myDropzoneOptions = {
maxFilesize: 5,
addRemoveLinks: true,
clickable: true
};
var myDropzone = new Dropzone('#myDropzoneElement', myDropzoneOptions);
var mockFile = { name: "Existing file!", size: 12345 };
myDropzone.options.addedfile.call(myDropzone, mockFile);
myDropzone.options.thumbnail.call(myDropzone, mockFile, "http://url-to-thumb-goes-here");
envision answered 2019-12-27T05:42:29Z
0 votes
在版本> 5中，createThumbnailFromUrl的参数已更改。要使其再次起作用，请查看以下GitHub问题：[https://github.com/enyo/dropzone/issues/1587#issuecomment-324023260]
Paul Beck answered 2019-12-27T05:42:50Z
0 votes
var mockFile = { name: "banner2.jpg", size: 12345, uuid: "085b2b23-70e7-4175-8355-89937d8d46f2" };
myDropzone.emit("addedfile", mockFile);
myDropzone.options.thumbnail.call(myDropzone, mockFile, "https://your-thumbnail-image.jpg");
在Dropzone-Object的Init-Function上init：function(){调用此命令：
this.on("addedfile", function(file) {
//Access the preview element with file.previewElement and add event listeners, etc... to it.
var a = document.createElement('a');
a.setAttribute('href',"{{{protokoll}}}://{{{HTTP_HOST}}}/a-getfiledb.php?uuid="+file.uuid);
a.setAttribute('class',"btn btn-success");
a.setAttribute('style',"width:50%; margin-top:5px; border-left:1px solid black; cursor:pointer;");
a.innerHTML = "";
file.previewTemplate.appendChild(a);
});
-2 votes
你可以尝试一下
var file_image = "http://someserver.com/myimage.jpg";
var mockFile = { name: "myimage.jpg", size: 12345 };
$("#dropzone").dropzone({
url: 'false',
maxFiles: 1,
maxFilesize:10,//mb
acceptedFiles:'image/*',
init: function() {
this.on("addedfile", function(file){
this.options.thumbnail.call(this,file,file_image);
});
this.addFile.call(this,mockFile);
}
});
Algoleigol answered 2019-12-27T05:43:30Z