如何显示jquery dropzone的错误消息

我将 dropzone 与 CI 一起使用，我不知道如何在上传错误时显示错误消息和自定义消息，这是我的脚本

Dropzone.autoDiscover = false;
        try {
            var myDropzone = new Dropzone("#adminform" , {
                paramName: "filename", // The name that will be used to transfer the file
                maxFilesize: 0.5, // MB
                url: window.location.href,
                addRemoveLinks : true,
                dictDefaultMessage :
                '<span class="bigger-150 bolder"><i class="ace-icon fa fa-caret-right red"></i> Drop files</span> to upload \
                <span class="smaller-80 grey">(or click)</span> <br /> \
                <i class="upload-icon ace-icon fa fa-cloud-upload blue fa-3x"></i>',
                dictResponseError: 'Error while uploading file!',

                //change the previewTemplate to use Bootstrap progress bars
                previewTemplate: "<div class=\"dz-preview dz-file-preview\">\n  <div class=\"dz-details\">\n    <div class=\"dz-filename\"><span data-dz-name></span></div>\n    <div class=\"dz-size\" data-dz-size></div>\n    <img data-dz-thumbnail />\n  </div>\n  <div class=\"progress progress-small progress-striped active\"><div class=\"progress-bar progress-bar-success\" data-dz-uploadprogress></div></div>\n  <div class=\"dz-success-mark\"><span></span></div>\n  <div class=\"dz-error-mark\"><span></span></div>\n  <div class=\"dz-error-message\"><span data-dz-errormessage></span></div>\n</div>",
            });
        } 
        catch(e) {
            alert('Dropzone does not support older browsers!');
        }

PHP 返回 400：

$this->output->set_header("HTTP/1.0 400 Bad Request");

但是当我将鼠标悬停在图像上时，它显示 [object Object] 但消息是：

dictResponseError：“上传文件时出错！”

对于任何有需要的人：

您可以使用 echo 从服务器返回响应消息。然后在js代码中添加错误事件处理程序

PHP

header("HTTP/1.0 400 Bad Request");
echo "Ups error message";

JS

this.on('error', function(file, response) {
    $(file.previewElement).find('.dz-error-message').text(response);
});