DropZone.js server side validation

Question

I'm doing server side validation for the files uploaded. Not every file that makes it to the server is stored. How can I display/trigger the error on the file(s) that were not successfully stored on the server. I've tried adding a server Validation function but can't figure out how to do it... Please help

                  this.on("successmultiple", function (file, successResponse) {
                        uploadResult = eval(successResponse);
                        toastr.options.positionClass = "toast-bottom-right";
                        var ErrorMessage = "";
                        for (var i = 0; i < uploadResult.ResultList.length; i++) {
                            var result = uploadResult.ResultList[i];
                            if (result.IsSuccessful === "True") {
                                toastr.success(result.Message);
                                if (hdnFileIDList !== "")
                                    hdnFileIDList = hdnFileIDList + "|" + result.ID;
                                else
                                    hdnFileIDList = result.ID
                            }
                            else {
                                //-- trigger dropzone error
                                toastr.warning(result.Message);
                                //this.ValidationError(file, result.Message);
                                file.accepted = false;
                                file.status = Dropzone.ERROR;
                                dropzone.serverError(file, result.Message);
                                //dropzone.emit("errormultiple", file, result.Message);
                            }                                
                        }
                        $("#<%=hdnSharedFileObjNewFileIDList.clientID%>").val(hdnFileIDList);
                    });

Answer 1

Solved my problem by adding the following code to Dropzone.js then calling it from my "successmultiple" event when I see and error in my returned JSON from the server.

 Dropzone.prototype.serverError = function (file, message) {
                file.accepted = false;
                file.status = Dropzone.ERROR;
                return this._errorProcessing(file, message);
            };