javascript – DropZone在init中替换图像

我用这段代码在init中上传数据库中的图像.现在我想上传新图像以删除此初始图像.

 var o = $("div#uploader").dropzone({
            url: "../../Merchant/UploadLogo",
            paramName: "logo",
            maxFiles: 1,

            //enqueueForUpload: false,
            maxfilesexceeded: function (file) {
                this.removeAllFiles();
                this.addFile(file);
            },

            addRemoveLinks: true,
            uploadMultiple: false,
            dictRemoveFile: "حذف",

            removedfile: function(file) {
                RemoveFile("Logo");
                var _ref;
                return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;
            },

            init: function() {

                var mockFile = { name: "avatar1.jpg", size: 12345, type: 'image/jpeg', url: "../../Merchant/GetLogo" };
                this.options.addedfile.call(this, mockFile);
                this.options.thumbnail.call(this, mockFile, mockFile.url);//uploadsfolder is the folder where you have all those uploaded files
            }

        });

解决方法:

我假设您想要在成功上传新图像时替换Dropzone中的旧图像.您可以通过组合Dropzone提供的this.on(‘success’)和this.removeFile方法来实现这一点：

Dropzone.options.myDropzone = {
    init: function() {
        this.on('success', function(file, message) {
            if (this.files.length > 1) {
                this.removeFile(this.files[0]);
            }
        });

        // ...
    }
};

为此,您的mockFile还必须注册为Dropzone的一个文件.要做到这一点,你可以在显示它之后立即将它推入init中的this.files数组：

// Create and Display Mock File
var mockFile = { name: "avatar1.jpg", size: 12345, url: '/image.png' };
this.options.addedfile.call(this, mockFile);
this.options.thumbnail.call(this, mockFile, mockFile.url);

// Register it
this.files = [mockFile];

资源：
Dropzone#SuccessEvent,
Dropzone#Methods和经验

标签：jquery,javascript,dropzone-js
来源： https://codeday.me/bug/20190624/1276986.html