javascript - 无法读取空 dropzone 的属性 'removeChild'

Question

我有这个代码:

JS代码:

var currentFile = null;
Dropzone.autoDiscover = false;
var myDropzone = new Dropzone("div#myDrop", {
    url             : "<?php echo $this->serverUrl() . '/profile/ajax/dzupload'; ?>",
    paramName       : 'profilepicture',
    acceptedFiles   : "image/*",
    maxFiles        : 1,
    addRemoveLinks  : true,
    init            : function() {

        var fileName = $('#profilePicture').val();
        var mockFile = { name: fileName, size: 12345 };
        this.options.addedfile.call(this, mockFile);
        this.options.thumbnail.call(this, mockFile, "<?php echo $this->serverUrl().'/public/profile/'.'usr'.$practitionerInfo->user_id.'/picture/'.$practitionerInfo->profilepicture ?>");
        currentFile = mockFile;


        this.on("addedfile", function(file) {
            if (currentFile) {
                this.removeFile(currentFile);
            }
            currentFile = file;
        });

        this.on("success", function(file, responseText) {

            $('#profilePicture').attr("value", responseText.filename);

            console.log(responseText );
        });

        this.on("maxfilesexceeded", function(file){
            this.removeFile(file);
            alert("You are not allowed to chose more than 1 file!");
        });

        this.on("removedfile", function (file){
            $.ajax({
                method: 'POST',
                url: '<?php echo $this->serverUrl() . '/profile/ajax/dzdelete' ?>',
                data: {
                    area    : 'company-profile',
                    name    : $('#profilePicture').attr('value')
                },
                success: function(result){
                    $('#profilePicture').attr("value", '')
                    console.log(result);
                }
            })
        });
    }

});

错误:

Cannot read property 'removeChild' of null

什么原因导致此错误？ 怎么解决呢？

使用上传功能时出现此错误

从来没有遇到过有人出现这样的错误？我该如何改进我的代码，使其只出现这个错误？

提前致谢!

Answer 1

将removedfile方法替换为这样

if ((_ref = file.previewElement) != null) {
    //_ref.parentNode.removeChild(file.previewElement);
    _ref.style.display = "none";
}

在文件 dropzone.js