Question

我的程序/ JFrame中有一个提交按钮，它检查验证并显示错误消息，然后弹出另一个表单并输入所有详细信息：

    private void btnSubmitActionPerformed(java.awt.event.ActionEvent evt) {                                          


    //VALIDATIONS-----------------------------------------------------------
    if(txtName.getText().trim().equals(""))
    {
        JOptionPane.showMessageDialog(null, "Must have name");
        jlblNameVer.setVisible(true);

    }
    else 
    {
        jlblNameVer.setVisible(false);
    }

    //ID VERIFICATION
    if (txtIdNumber.getText().trim().equals(""))
   {
        JOptionPane.showMessageDialog(null, "Photo Id must not be emplty");
   }

    //EMAIL VALIDATION
    if(txtEmail==null ||txtEmail.getText().length() < 10|| txtEmail.getText()== null ||!(txtEmail.getText().trim().contains("@") && txtEmail.getText().trim().contains(".")))
    {
         JOptionPane.showMessageDialog(null, "Invalid Email");
     }

    //Phone Number Validation
     if(txtPhoneNum.getText().length() < 10)
    {
        JOptionPane.showMessageDialog(null, "Must atleast 10 characters");
    }

     //COMBOBOX VALIDATIONS
     if(cmbStayDuration.getSelectedIndex() == -1)
    {
        JOptionPane.showMessageDialog(null, "Please select stay duration");
    }

     //Photo ID
      if(cmbPhotoId.getSelectedIndex() == -1)
    {
        JOptionPane.showMessageDialog(null, "Please select Photo ID type");
    }


      //Popup form
       jfrmDetails nf1 = new jfrmDetails();
        jfrmDetails.txtRoomTypef2.setText(this.cmbRoomType.getSelectedItem().toString());
        jfrmDetails.txtRoomNumf2.setText(this.cmbRoomNumber.getSelectedItem().toString());
        jfrmDetails.txtCheckIn.setText(this.ftxtCheckinDate.getText());
        jfrmDetails.txtCheckOut.setText(this.txtCheckOut.getText());
        jfrmDetails.txtName.setText(this.txtName.getText());
        jfrmDetails.txtIdType.setText(this.cmbPhotoId.getSelectedItem().toString());
        jfrmDetails.txtIdNum.setText(this.txtIdNumber.getText());
        jfrmDetails.txtPhoneNum.setText(this.txtPhoneNum.getText());
        jfrmDetails.txtEmail.setText(this.txtEmail.getText());
        nf1.setVisible(true);


}

问题是即使这些验证错误，表格仍然会弹出

如果任何验证不正确，我不希望弹出窗体显示，我该怎么办？

Answer 1

您需要将if块重组为if-else if-else块，以便最后一个（else）条件显示新视图或使用boolean字段确定是否验证passed，例如......

boolean passed = true;
if (txtName.getText().trim().equals("")) {
    JOptionPane.showMessageDialog(null, "Must have name");
    jlblNameVer.setVisible(true);
    passed = false;

} else {
    jlblNameVer.setVisible(false);
}

//ID VERIFICATION
if (txtIdNumber.getText().trim().equals("")) {
    JOptionPane.showMessageDialog(null, "Photo Id must not be emplty");
    passed = false;
}

//EMAIL VALIDATION
if (txtEmail == null || txtEmail.getText().length() < 10 || txtEmail.getText() == null || !(txtEmail.getText().trim().contains("@") && txtEmail.getText().trim().contains("."))) {
    JOptionPane.showMessageDialog(null, "Invalid Email");
    passed = false;
}

//Phone Number Validation
if (txtPhoneNum.getText().length() < 10) {
    JOptionPane.showMessageDialog(null, "Must atleast 10 characters");
    passed = false;
}

//COMBOBOX VALIDATIONS
if (cmbStayDuration.getSelectedIndex() == -1) {
    JOptionPane.showMessageDialog(null, "Please select stay duration");
    passed = false;
}

//Photo ID
if (cmbPhotoId.getSelectedIndex() == -1) {
    JOptionPane.showMessageDialog(null, "Please select Photo ID type");
    passed = false;
}

if (passed) {

    //Popup form
    jfrmDetails nf1 = new jfrmDetails();
    jfrmDetails.txtRoomTypef2.setText(this.cmbRoomType.getSelectedItem().toString());
    jfrmDetails.txtRoomNumf2.setText(this.cmbRoomNumber.getSelectedItem().toString());
    jfrmDetails.txtCheckIn.setText(this.ftxtCheckinDate.getText());
    jfrmDetails.txtCheckOut.setText(this.txtCheckOut.getText());
    jfrmDetails.txtName.setText(this.txtName.getText());
    jfrmDetails.txtIdType.setText(this.cmbPhotoId.getSelectedItem().toString());
    jfrmDetails.txtIdNum.setText(this.txtIdNumber.getText());
    jfrmDetails.txtPhoneNum.setText(this.txtPhoneNum.getText());
    jfrmDetails.txtEmail.setText(this.txtEmail.getText());
    nf1.setVisible(true);

}

或

if (txtName.getText().trim().equals("")) {
    JOptionPane.showMessageDialog(null, "Must have name");
    jlblNameVer.setVisible(true);
} else {
    jlblNameVer.setVisible(false);

    //ID VERIFICATION
    if (txtIdNumber.getText().trim().equals("")) {
        JOptionPane.showMessageDialog(null, "Photo Id must not be emplty");
        passed = false;
    } else if (txtEmail == null || txtEmail.getText().length() < 10 || txtEmail.getText() == null || !(txtEmail.getText().trim().contains("@") && txtEmail.getText().trim().contains("."))) {
        JOptionPane.showMessageDialog(null, "Invalid Email");
        passed = false;
    } else if (txtPhoneNum.getText().length() < 10) {
        JOptionPane.showMessageDialog(null, "Must atleast 10 characters");
        passed = false;
    } else if (cmbStayDuration.getSelectedIndex() == -1) {
        JOptionPane.showMessageDialog(null, "Please select stay duration");
        passed = false;
    } else if (cmbPhotoId.getSelectedIndex() == -1) {
        JOptionPane.showMessageDialog(null, "Please select Photo ID type");
        passed = false;
    } else {

        //Popup form
        jfrmDetails nf1 = new jfrmDetails();
        jfrmDetails.txtRoomTypef2.setText(this.cmbRoomType.getSelectedItem().toString());
        jfrmDetails.txtRoomNumf2.setText(this.cmbRoomNumber.getSelectedItem().toString());
        jfrmDetails.txtCheckIn.setText(this.ftxtCheckinDate.getText());
        jfrmDetails.txtCheckOut.setText(this.txtCheckOut.getText());
        jfrmDetails.txtName.setText(this.txtName.getText());
        jfrmDetails.txtIdType.setText(this.cmbPhotoId.getSelectedItem().toString());
        jfrmDetails.txtIdNum.setText(this.txtIdNumber.getText());
        jfrmDetails.txtPhoneNum.setText(this.txtPhoneNum.getText());
        jfrmDetails.txtEmail.setText(this.txtEmail.getText());
        nf1.setVisible(true);

    }

}

您还应该查看The Use of Multiple JFrames, Good/Bad Practice?，也可以考虑使用CardLayout，但这取决于您的基本需求

您还可以查看Validating Input，这样您就可以在丢失焦点时对字段进行后期验证

JFrame提交按钮确认

1 个答案: