summary: I have designed a project which requires user to input serial number during installation, and I customized the dialog for input serial number. Everything has gone well, but there's one thing I feel not satisfied: I design 4 textfields(edit fields) for serial number, a serial number is of 16 digits, so every textfield, in a perfect status, should only be input 4 digits.
The problem is, how can I control the input for every textfield, for example, if user input 123456 in one textfield, 56 should be ingored; and how can put focus on the next textfield if one textfield has input 4 digits?
In InstallScript/InstallScript MSI dialogs you can catch LBN_SELCHANGE notification for edit boxes and after that change the control text back or move focus to another control.
nId = WainOnDialog(szDlg); switch(nId) ... case EDITBOXID: if(CtrlGetSubCommand (szDlg) = EDITBOX_CHANGE) then CtrlGetText(szDlg,EDITBOXID,szText); if(StrLengthChars(szText) > 4) then CtrlSetText(...); hwndCtrl = GetDlgItem(hwndDlg,EDITBOXID_2); SetFocus(hwndCtrl); endif; endif; ... endswitch;
why allow them to enter more characters than you want to allow? Maybe I'm missing something, the textbox has a property Max. Length.. As for focus, why move the focus. Why not just create a tab order that makes sense. Most UI designs struggle with moving a user automatically from one field to another (i.e. my favorite is phone number when a developer breaks it into 3 textboxes).
