Changing the enabling to disabling content by giving condition to combo box

Question

I have a certain selection in combo box. Based on that selection some items need to be enabled/disabled. However I am unable to do so. And also another problem is once a single option is selected I cant change it to another selection without backspace and typing that selection again.

m_d_lvlayers is the variable of IDC of combo box. Its type is CString .

void CThermalToolDlg::OnCbnSelchangeLvLayers()
{
// TODO: Add your control notification handler code here
if (m_d_lvlayers == "2" )
{
    UpdateData();
    GetDlgItem(IDC_LV3_CU)->EnableWindow(0);
    GetDlgItem(IDC_LV3_ICI)->EnableWindow(0);
            //etc etc

    UpdateData(0);
}
else if (m_d_lvlayers == "3")
{
    UpdateData();
    GetDlgItem(IDC_LV3_CU)->EnableWindow(1);
    GetDlgItem(IDC_LV3_ICI)->EnableWindow(1);
            //etc etc

    UpdateData(0);
}
else
{
    UpdateData();
    GetDlgItem(IDC_LV3_CU)->EnableWindow(1);
    GetDlgItem(IDC_LV3_ICI)->EnableWindow(1);
    //etc etc

    UpdateData(0);
}

}

I expect to get proper selections in combobox and corresponding enabling and disabling.

Answer 1

You need to call UpdateData(TRUE); first .

bSaveAndValidate

Flag that indicates whether dialog box is being initialized (FALSE) or data is being retrieved (TRUE)

void CThermalToolDlg::OnCbnSelchangeLvLayers()
{
    UpdateData(TRUE); // Controls to Variables

    if (m_d_lvlayers == "2" )
    {
        GetDlgItem(IDC_LV3_CU)->EnableWindow(FALSE);
        GetDlgItem(IDC_LV3_ICI)->EnableWindow(FALSE);
        //etc etc

        UpdateData(FALSE);
    }
    else if (m_d_lvlayers == "3")
    {
        GetDlgItem(IDC_LV3_CU)->EnableWindow(TRUE);
        GetDlgItem(IDC_LV3_ICI)->EnableWindow(TRUE);
                //etc etc

        UpdateData(FALSE);
    }
    else
    {
        GetDlgItem(IDC_LV3_CU)->EnableWindow(TRUE);
        GetDlgItem(IDC_LV3_ICI)->EnableWindow(TRUE);
        //etc etc

        UpdateData(FALSE);
    }
}

Although in your code it makes no sense to call UpdateData(FALSE); because all you are doing is setting the control window state to enabled.