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Vaadin - GRID Component

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Introduction Vaadin 7.4 was recently released and it includes a new component called the GRID . It represents a 'Spreadsheet" type model from a UI perspective, however I think it lacks a lot of features you would expect from this type of component. Maybe this component will evolve over time and it will begin to have the functions that you expect from a spreadsheet. ( note: there is a commercial add on called the Spreadsheet from Vaadin ) Use Case The use case I am demonstrating below is a simple grid showing projected sales of Widgets over a five year period. Creation Creating a Grid is very simple and you have numerous options for sizing on the page. In the example below I setting it across the page. The Grid rows can be selected for editing, you can select single or multiple rows in a single action. myGrid = new Grid(); myGrid.setSizeFull(); myGrid.setSelectionMode(SelectionMode.SINGLE); Container Backing Similar to many other Vaadin componen
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Connecting a Vaadin SQL Container to a Combo Box

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It must be me. But I spent a lot of time trying to figure out how to connect a database table implemented as a Vaadin SQL Container to a Vaadin Combo Box. It seems such a simple concept. Anyway, here was my requirement. I needed a combo box to contain a list of Australia suburbs. The user would select a suburb which would filter the results in a table on the screen. My database table was very simple. A id field ( which was the primary key ) and a name field which contained the suburb name. The code for the SQL Container was simple. TableQuery q = new TableQuery("suburb", connectionPool); suburbContainer = new SQLContainer(q); Now code to establish the combo box and links to the SQL Container.   ComboBox suburbCB = new ComboBox();  suburbCB.addItem("");  suburbCB.setCaption("Filter by Suburb");  suburbCB.setContainerDataSource(app.getDatabase().loadSuburbs());  suburbCB.setItemCaptionPropertyId("name");  suburbCB.setItemC
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Web Cam and Vaadin

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A very interesting Web Cam Add On is available from the Vaadin Add On site . Here is a simple recipe for making it work. Create a split panel and add the Web Cam to the left hand side of the panel. splitPanel = new HorizontalSplitPanel(); splitPanel.setSizeFull(); VerticalLayout detailsLayout = new VerticalLayout(); detailsLayout.setSpacing(true); detailsLayout.setSizeFull(); // Create the webcam and assign a receiver. final Webcam webcam = new Webcam(); webcam.setWidth("600px"); detailsLayout.addComponent(webcam); detailsLayout.setComponentAlignment(webcam, Alignment.TOP_LEFT); Create a receiver which creates a temporary file with a jpeg extension. webcam.setReceiver(new Upload.Receiver() { @Override public OutputStream receiveUpload(String filename, String mimeType) { try { targetFile = File.createTemp
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