I created state value's reason fields into incident table and whenever state value changes

[ashrkml321]

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

   if (isLoading || newValue === '') {

      return;

   }

   var gr= g_form.getValue('state');

    g_form.setDisplay('u_open_reason', false);

    g_form.setDisplay('u_resolve_reason', false);

    g_form.setDisplay('u_hold_reason', false);

    g_form.setDisplay('u_close_reason', false);

    g_form.setDisplay('u_new_reason', false);

    g_form.setMandatory('u_open_reason', false);

    g_form.setMandatory('u_resolve_reason', false);

    g_form.setMandatory('u_hold_reason', false);

    g_form.setMandatory('u_close_reason', false);

    g_form.setMandatory('u_new_reason', false);

    if (gr==1)

    {

        g_form.setDisplay('u_open_reason', true);

        g_form.setMandatory('u_open_reason', true);

    }

    else if (gr==2)

    {

        g_form.setDisplay('u_new_reason', true);

        g_form.setMandatory('u_new_reason', true);

    }

    else if (gr==3)

    {

        g_form.setDisplay('u_hold_reason', true);

        g_form.setMandatory('u_hold_reason', true);

    }

    else if (gr==6)

    {

        g_form.setDisplay('u_resolve_reason', true);

        g_form.setMandatory('u_resolve_reason', true);

    }

    else if (gr==7)

    {

        g_form.setDisplay('u_close_reason', true);

        g_form.setMandatory('u_close_reason', true);

    }

}

I created state value's reason fields into incident table and whenever state value changes respective fields should be visible and mandatory. Please help me for this...