GWT or Javascript? A Vaadin expert's opinion. by Haijian Wang

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G W T O R J A V A S C R I P T ? A V A A D I N E X P E R T ’ S O P I N I O N H A I J I A N W A N G

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Is GWT Dying? Scary Questions First Should I use JavaScript Instead?

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Scary Questions First Too Scary to answer

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Let’s limit the scope to Vaadin application Too Scary to answer

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What is Vaadin? A Java web framework for building Web applications.

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A What is Vaadin? Server Side Java web framework for building Web applications.

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How does Vaadin application look like?

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Vaadin Application Architecture

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GWT or JavaScript? Custom Widget: two approaches

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•Language Preference •Community Support •Development Speed •Requirement Considerations

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Language Preference JavaScript sucks?https://www.youtube.com/watch?v=xE8tL8NdHaY Or not.

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Community Support

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Development Speed •Widgetset Compilation •Debugging

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Requirement Case studies •Workﬂow canvas in SVG •Disable backspace navigation

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Workﬂow Canvas in SVG

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Workﬂow Canvas in SVG raphael4gwt ->Snap.svg -> Raphaël?

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Disable backspace navigation Event.addNativePreviewHandler(new NativePreviewHandler() { @Override public void onPreviewNativeEvent(NativePreviewEvent event) { if(event.getNativeEvent().getKeyCode() == KeyCodes.KEY_BACKSPACE) { if(!WidgetUtil.isFocusedElementEditable()) { event.getNativeEvent().stopPropagation(); event.getNativeEvent().preventDefault(); } } } });

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Disable backspace navigation It’s now disabled by default since Chrome 52.

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Conclusion •GWT is NOT dead. •It’s fun to learn some JavaScript. •Choose whichever ﬁts you best.