提交表单后重新初始化/重置dropzone

Question

我正在使用dropzone.js在rails上的ruby上传图像.这是我的HTML代码

<div class="row">
  <div class="col-md-12" id="drop-zone-container">
    <%= form_tag '/settlement_proofs', method: :post, class: 'dropzone form', id: 'media-dropzone' do %>
        <div class="fallback">
          <%= file_field_tag 'attachment', multiple: true%>
        </div>
    <% end %>
  </div>
</div>

我将dropzone初始化为

$("#media-dropzone").dropzone({
    acceptedFiles: pg.constants.ACCEPTED_FORMAT,
    maxFilesize: pg.constants.ATTACHMENT_MAX_FILE_SIZE, //In MB
    maxFiles: pg.constants.ATTACHMENT_MAX_SIZE,
    addRemoveLinks: true,
    removedfile: function (file) {
        if (file.xhr.responseText.length > 0) {
            var fileId = JSON.parse(file.xhr.responseText).id;
            $.ajax({
                url: pg.constants.url.SETTLEMENT_BASE_URL + fileId,
                method: 'DELETE',
                dataType: "json",
                success: function (result) {
                    $('#uploaded_attachment').val($("#uploaded_attachment").val().replace(result.id + ',', ""));
                    $('#settlement_proof_status span').fadeOut(0);
                    var _ref;
                    return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;

                },
                error: function () {
                    $('#settlement_proof_status').text(I18n.t('attachment_deletion_error')).fadeIn();
                }

            });
        }

    },
    init: function () {

        this.on("success", function (file, message) {
            debugger;
            appendContent(message.attachment.url, message.id);
        });

        this.on("error", function (file, message) {
            $('#settlement_proof_status span').text(message).fadeIn();
            var _ref;
            return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;
        });
        $('#settlement_invoice_submit_btn').click(function () {
            $("#new_settlement_invoice").submit();
        });
        $('#uploaded_attachment').change(function () {
            if (this.value.length == 0) {
                this.removeAllFiles();
            }
        });
    }
});

在我通过AJAX提交表单后,我需要使用默认图像重置dropzone字段.

Answer 1

this.on("complete", function(file) { 
   this.removeAllFiles(true); 
})

在INIT函数中编写上面的代码.

这将删除dropzone中的所有文件,并将dropzone重置为初始状态.

http://www.dropzonejs.com/#event-reset

Answer 2

我从 Senug Nam Kim 和 J Santosh 那里举了一个例子：

// Where .reset-dz is the class of a button
$('.reset-dz').on('click', function(e){
    var myDropzone = Dropzone.forElement("#user-post-submit");
    myDropzone.removeAllFiles(true); 
});

Answer 3

最后我自己解决了这个问题。首先，我从其父元素中删除表单。它删除了现有的 dropzone 实例。然后我使用 jQuery 创建表单并再次重新初始化 dropzone。这是我的完整代码

 // To reset dropzone before popup load
    var resetDropzone = function () {

        $('#drop-zone-container').empty();

        var $form = makeElement('form', {
            action: window.pg.constants.url.SETTLEMENT_BASE_URL,
            method: 'post',
            id: 'settlement-proof-form',
            class: 'dropzone'
        });

        $('#drop-zone-container').append($form);

        var settlmentProofDropZone;
        $("#settlement-proof-form").dropzone({
            acceptedFiles: pg.constants.ACCEPTED_FORMAT,
            maxFilesize: pg.constants.ATTACHMENT_MAX_FILE_SIZE, //In MB
            maxFiles: pg.constants.ATTACHMENT_MAX_SIZE,
            addRemoveLinks: true,
            removedfile: function (file) {
                if (file.xhr.responseText.length > 0) {
                    var fileId = JSON.parse(file.xhr.responseText).id;
                    $.ajax({
                        url: pg.constants.url.SETTLEMENT_BASE_URL + fileId,
                        method: 'DELETE',
                        dataType: "json",
                        success: function (result) {
                            $('#uploaded_attachment').val($("#uploaded_attachment").val().replace(result.id + ',', ""));
                            $('#settlement_proof_status span').fadeOut(0);
                            var _ref;
                            return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0;

                        },
                        error: function () {
                            $('#settlement_proof_status').text(I18n.t('attachment_deletion_error')).fadeIn();
                        }

                    });
                }

            },
            init: function () {
                settlmentProofDropZone = this;

                this.on("success", function (file, message) {
                    appendContent(message.attachment.url, message.id);
                });
            }
        });

    };

    function makeElement(element, options) {
        var $formField = document.createElement(element);
        $.each(options, function (key, value) {
            if (key === 'innerHTML') {
                $formField.innerHTML = value;
            }
            else {
                $formField.setAttribute(key, value);
            }
        });
        return $formField;
    }
});

Answer 4

尝试这个：

//DropZone Initiation Section
init: function() {
    this.on('success', function(file, json) {
    });

    this.on('addedfile', function(file) {
    });

    this.on('drop', function(file) {
    });

    this.on('removedfile', function(file) {
    });

    this.on('complete', function(file) {
    });

    this.on('error', function(file) {
    });

    this.on('resetFiles', function() {
        if(this.files.length != 0){
            for(i=0; i<this.files.length; i++){
                this.files[i].previewElement.remove();
            }
            this.files.length = 0;
        }
    });
}

function JS_ClearDropZone() {
    //DropZone Object Get
    var objDZ = Dropzone.forElement("div#objDropzone");
    //"resetFiles" Event Call
    objDZ.emit("resetFiles");
}