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A Servoy Smart or Web Client always comes with a main window and programmatically new windows can be opened or dialogs can be shown on top of existing windows to display Forms.



Window Definition

Windows are independent of each other and are only tied to the Client. Closing the Client will close all windows. When a Smart or Web Client is launched it will always open with a window, the so-called main window. Closing the main window will close the Client and all other windows associated with the Client.

In the Smart Client each window occupies an entry on the system bar. The individual windows can be minimized, maximized and closed independently and can be moved in front of one another.

In the Web Client a window can be either a separate browser window or an additional tab in the existing browser window, depending the type of browser and/or the browsers configuration. The usefulness of opening new windows in browsers however is limited, due to browser restrictions on opening new windows/tabs programmatically from within a page. Almost any browser nowadays comes out of the box with a popup blocker installed, preventing pages from automatically opening new windows/tabs.

Dialog Definition

Dialogs are bound to a parent, being the main window, another window or dialog. A dialog is always on top of its parent and automatically close if their parent is closed. At the top of a hierarchy of dialogs, there is always one window, being either the main window  or an additional window opened at a later stage.

In the Smart Client a Dialog is similar to a Window, with the exceptions that it does not support maximize and minimize operations, on top of the general restrictions applied to dialogs (tied to a parent, always on top of their parent and automatically closed when the parent closes). While a dialog is always op top of it's parent, in the Smart Client the dialog window can be moved around independently and thus be located in such a position as to not overlap it's parent.

In the Web Client a Dialog is displayed inline in the browser window/tab that displays the window in the dialogs parent hierarchy. 

Dialog Modality

Dialogs can be either modal or non-modal (also referred to as modeless). A modal dialog blocks access to all other dialogs and the window in it's parent hierarchy, whereas non-modal dialogs do not block the access.

In the Smart Client, if run under Java 5, the modal dialog will block all windows and dialogs, not only the ones in it's parent hierarchy. See #Smart Client modal dialog behavior difference in Java 5 & Java 6 for more info.

In the Smart Client the call that shows the modal dialog is blocking, meaning that it will not continue until the modal dialog is closed. Only when the dialog is closed will the rest of the code in the function that showed the modal dialog be executed.

In the Web Client the call that shows the modal dialog in non-blocking, meaning it will return immediately and the rest of the code in the function will continue to execute. 

In addition to the ability to open new windows and show dialogs displaying Forms, Servoy also comes with a Dialogs plugin to show standard dialogs. This plugin only has limited support for usage in the Servoy Web Client.

Smart Client Modal Dialog Behavior Difference


in Java 5 & Java 6

Due to limitations in Java 5 with regards to the modality API of windows and dialogs, a modal dialog in the Smart Client that runs under Java 5 will block ALL windows and dialogs, whereas when running under Java 6 the modal dialog will only block the dialogs and the window in its parent hierarchy.

Through the Smart Client settings on the Servoy Admin page, it's possible to restrict Smart Client to only run on Java 6 (or higher, although Java 6 has not been released yet). See Smart Client Settings for more information on specifying the min/max Java version for Smart Clients.

Web Client Compatibility


As described in the introduction above, there are differences between the Smart Client and the Web Client when it comes to Windows and Dialogs:


The first two items in the above list are due to technical restrictions in the browser, where item 2 is a design decision based on the restriction mentioned under item 1. 
The reasons behind item 3 & 4 are of technical nature and are likely to be resolved in a future version of Servoy. For the time being, the differences in items 3 & 4 can be ironed out.

Ironing Out


the Differences

The solution to item 1 & 2 is to not use windows in combination with the Web Client: due to the fact that popups were abused on the web, every browser now comes with popup blockers that are enabled by default. Due to this, the defacto standard for web applications in general is a single window interface.


The Dialogs module on ServoyForge is a drop-in replacement for the dialogs plugin that ships with Servoy and for the modal dialog API of Servoy.  

Windowing API Overview

The API for windows and dialogs is located in several locations throughout the scripting API of Servoy: