How to fix this " Uncaught TypeError: Cannot read properties of undefined (reading 'mData') "

Question

Friends,

I am using Aspx. VB tool for web apps development. following my code is works find and data is saved sucessfully, after this sucessfull message, Im getting a followin error. How to I fix this?

Uncaught TypeError: Cannot read properties of undefined (reading 'mData')

ref my JQuery script:

    $.ajax({  
                       type: "POST",  
                       url: "ICT_InsuranceDocumentationV3.aspx/PostImageDB",  
                       data: '{f_db: ' + JSON.stringify(f_db) + '}',  
                       contentType: "application/json; charset=utf-8",  
                       dataType: "json",  
                       success: function (response) {  
                           var result = response.d;  
                           if (result == '1') {  
                               alert("The Banking Statement/Passbook/Cheque information has been updated successfully!");  
                               $(".modal-backdrop").remove();  
                               $("#PopuBankDocUL").modal('show');  
                               $('#chkbox_IsScanDocUploaded').prop('checked');  
                               $('#btn_UploadBankDoc').prop("disabled", true);  
                               $('#btnImgsubmit').prop("disabled", true);  
                           }  
                           else if (result == '2') {  
                               alert("The Banking Statement/Passbook/Cheque details are replaced with this new data!");  
                           }  
                           else {  
                               alert("Sorry! There is an err. on Data Transmission, please contact IT Admin!");  
                           }  
                       },  
                       error: function (data, ex) {  
                           alert("Sorry there is err. " + data + " Ex: " + ex);  
                           $(".modal-backdrop").remove();  
                           $("#PopuBankDocUL").modal('show');  
                       }  
                   });  
               }  
           }

My Backend VB Code

   
    Public Shared Function PostImageDB(f_db As f_db) As String  
        Dim DCStr As String = ConfigurationManager.ConnectionStrings("ICT_ConStr").ConnectionString  
        Dim selectSQL As String  
        Dim sCon As New SqlConnection(DCStr)  
        Dim sCmd As New SqlCommand(selectSQL, sCon)  
        Dim param As SqlParameter  
        Dim dtadp As New SqlDataAdapter(sCmd)  
        Dim dtset As New DataSet  
        Dim f_retval As String = ""  
        Try  
            sCon.Open()  
            sCmd.CommandType = CommandType.StoredProcedure  
            sCmd.CommandText = "ICTUSP_BankDocumentUploads_Txn"  
            sCmd.Parameters.Clear()  
            sCmd.Parameters.Add(New SqlParameter("@i_SP_AttributeId", SqlDbType.Int)).Value = 1  
            sCmd.Parameters.Add(New SqlParameter("@i_ApplTrackingNo", SqlDbType.VarChar)).Value = f_db.trackingId  
            sCmd.Parameters.Add(New SqlParameter("@i_LoanId", SqlDbType.VarChar)).Value = f_db.LoanId  
            sCmd.Parameters.Add(New SqlParameter("@i_BankDocumentTypeID", SqlDbType.VarChar)).Value = f_db.doctypeId  
            sCmd.Parameters.Add(New SqlParameter("@i_BankDocumentProofPath", SqlDbType.VarChar)).Value = f_db.ulFileName  
            sCmd.Parameters.Add(New SqlParameter("@i_LastTxnDate", SqlDbType.VarChar)).Value = f_db.ftxndt  
            sCmd.Parameters.Add(New SqlParameter("@i_Remarks", SqlDbType.VarChar)).Value = f_db.remarks  
            param = New SqlParameter("@o_ErrorStatus", SqlDbType.Int) With {  
            .Direction = ParameterDirection.Output  
            }  
            sCmd.Parameters.Add(param)  
            dtadp.Fill(dtset)  
            If sCmd.Parameters("@o_ErrorStatus").Value = 1 Then  
                f_retval = "1"  
            ElseIf sCmd.Parameters("@o_ErrorStatus").Value = 2 Then  
                f_retval = "2"  
            End If  
        Catch ex As Exception  
            f_retval = "9"  
        Finally  
            sCon.Close()  
        End Try  
        Return f_retval  
    End Function

Answer

The issue is on your javascript side. Not sure what mData is but you should be able to search for that actual offending line. The callstack indicates that your JS code (contained in the mentioned aspx file??) is enumerating what looks like the rows of a datatable. During the enumeration it is running across the row with this error. You need to set a breakpoint in your .aspx page where that call is occurring and step through it. Scenario 1 is that it is trying to read data from the server response and no data is available. Scenario 2 is that you have rows of data but one of the rows is missing the field you're looking for. You can use the browser tools to look at the data coming back from the server to identify which scenario it is.

Answer

Hi,

I understand what the issue is, but I have no idea how to solve it!
When I perform this with Model Popup, an error occurs, but without Model Popup, everything goes as expected. Tell me how to fix this with Model Popup, please. (But It must preform within Popup)

*This is my Model Popup window, How I fix the issue?*   
  
  
                              
                                  
                                      
                                          
                                        Claiment Bank Statement/Passbook/Cheque Upload  
                                          
                                      
                                      
                                          
                                              
                                                  
                                                      
                                                        Pls upload scanned Image/PDF Only, allowed 2MB File size  
                                                          
                                                              
                                                          
                                                      
                                                      
                                                      
                                                          
                                                              
                                                                Loan ID  
                                                                  
                                                              
                                                          
                                                          
                                                              
                                                                Bank Name  
                                                                  
                                                              
                                                          
                                                          
                                                              
                                                                Bank Acct No.  
                                                                  
                                                              
                                                          
                                                          
                                                              
                                                                01.Bank Proof Type *  
                                                                  
                                                                      
                                                                      
                                                                      
                                                                      
                                                                  
                                                                  
                                                              
                                                          
  
                                                          
                                                              
                                                                02.Bank Last Transaction Date *  
                                                                  
                                                                      
                                                                          
                                                                      
                                                                      
                                                                      
                                                                  
                                                              
                                                          
  
                                                          
                                                              
                                                                3.Pls Upload Bank Proof *  
                                                                  
                                                                  
                                                                  
                                                                  
                                                              
                                                          
                                                          
                                                          
                                                              
                                                                04.For Upload  
                                                                  
                                                              
                                                          
                                                          
                                                          
                                                              
                                                                05.File View  
                                                                  
                                                              
                                                          
                                                          
                                                              
                                                              
                                                                  
                                                              
                                                              
                                                          
                                                          
                                                          
                                                              
                                                                04.Remarks  
                                                                  
                                                              
                                                          
  
  
                                                          
                                                               
                                                              
                                                                
                                                              <%-- --%>

Answer

Hi,

I have identified issue, and fixed it, problem is in updatepannel only, I have added following buttons control in Triggers, as follows. all issues solved.

Thanks,

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How to fix this " Uncaught TypeError: Cannot read properties of undefined (reading 'mData') "

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