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ADF Faces provides over 50 different graph types, as shown in Figure 16-1, including bar graphs, pie charts, line charts, and scatter charts. Each of the graph categories may have a number of different options for that graph. For example, a bar graph could be stacked, based on percentages,
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FIGure 16-1. Graph Component Gallery
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or have a dual Y-axis. Furthermore, JDeveloper also includes a number of quick start layouts that define whether the graph displays features such as a legend or title, and their position. Regardless of the flavor of graph or the layout chosen, the concept is similar for most of the graphs, where a set of data values is plotted against a series of reference points. You can peruse the different types of graphs at your leisure, but for now, let s focus on two of the more common graphs: bar and pie graphs.
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The example presented in this section shows you how to design a page to display the order history for the currently selected customer. Given that a customer may have many orders, it would be good to see if there has been a trend to the order history. It might be beneficial to see if the value of the customer s orders have been increasing or decreasing over time, or if any peaks in their order history coincide with a sales campaign or a special offer. A bar graph plotting order totals over time might be useful. Assuming you already have a table on the page showing customers, then displaying this order information is akin to adding a detail to the customer master table. From the Data Controls panel,
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drag and drop the data collection representing the orders for customers onto the appropriate area of the page. On choosing that you want to display this information as a graph, JDeveloper displays the Component Gallery dialog, as shown in Figure 16-1. Select a bar graph and choose one of the quick start layouts. You then have to supply information as to how this data collection should be displayed. In this case, you want to set Bars to OrderTotal and X Axis to OrderDate. You can do this by dragging and dropping the attributes onto the correct field.
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TIp Since you are plotting the data based on an order date, it makes sense to ensure that the data collection is ordered based on order date, in which case you may want to ensure you have an order clause added to the appropriate view object.
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You can now run and display the graph.
Data Visualization Components
NOTe Depending on how you have built your page, you may find that selecting a customer from the table does not update the graph. Why would that be Well, the graph component is not aware that you are changing rows in the table, so you need to tell the graph that it should refresh itself when the data model changes to point to a new row. To do this, you can either set PartialTriggers on the graph to reference the customer table, or set ChangeEventPolicy to ppr on the binding executable for the orders graph. Now that you have a basic bar graph up and running, let s take a look at some of the options for fine-tuning the graph.
Setting Graph properties
Just like any other ADF Faces component, the graph you have created has a number of properties that can be used to control various features of the component. For example, the properties 3D Effect and Style can both be used to change the look of the graph, as shown in Figure 16-2.
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FIGure 16-2. Using the graph properties to control the features of a graph
The graph can also be animated using AnimationOnDisplay and MarkerTooltipType, the latter of which can be used to display information as the mouse is moved over a bar, also shown in Figure 16-2. Other properties such as EmptyText can be used to define a message if there is no graph data, and DynamicResize will automatically stretch the graph within its parent container.
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