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Building Application Flow
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Displaying a Task Flow in a Dialog
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In order to display a task flow in a modal dialog, you need to set two properties on the task flow call activity. By setting Run As Dialog to true and Display Type as inline-popup, you can define that this task flow will be displayed inside an inline dialog.
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You also have to set UseWindow to true on the button that will launch the task flow. Now when the task flow is called from, for example, a button click, instead of appearing in a new window, it will appear in the pop-up dialog. NOTe After editing information in the task flow dialog, you might notice on returning to the calling page that the data is not reflected in, in this case, the table of customers. Even if you set ChangeEventPolicy on the binding to ppr, this only updates the customers table when you click on a new row. The reason is that the current implementation of task flow dialogs does not automatically refresh the calling page. To force a refresh, you have to write a method that forces the refresh when the dialog closes. This is covered in 19.
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Task Flow Parameters and Scope
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Just like the analogy of a subroutine, a bounded task flow can have in and out parameters. This allows you to build task flows that are more loosely coupled, where information from outside the task flow can be passed in rather than referenced from within the task flow. And just like a procedure or method in a programming language, you can define the visibility, or scope, of these parameters.
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Task Flow Parameters
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Let s consider the following use case based on the previously demonstrated bounded task flow for creating a new customer. In this case, you want the task flow for creating a new customer to be parameterized. It could be that you want to pass in information about the user who is creating the new customer, or maybe default values for the fields; however, in this case the value of the parameter will be a string to be used in the heading on the task flow page.
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Defining the Task Flow Parameter The first step is to define what parameters the task flow should take. On the task flow diagram, click the Overview tab to display the overview information for the task flow, and select Parameters. Here you can define parameters, both in and out, for the task flow. Click the green plus button to create a new Input Parameter Definition. You can define the name of the parameter, its type (which if blank defaults to String), and whether the parameter is required.
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You also have to define where the parameter is stored while the task flow is executing. The field Value should default to #{pageFlowScope.createTFInputParam1}, which is a page flow scope parameter with the same name as the task flow parameter, or you can select this value from the Expression Builder dialog. This means that the parameter is being held in a special piece of memory called pageFlowScope, which is available while the task flow is running. To reference the parameter within the task flow pages, in this example, the text for a header, set the appropriate property to reference this special piece of memory where the parameter is being stored: #{pageFlowScope.createTFInputParam1}.
13:
Building Application Flow
A Brief Word About Scope So what is scope and why is it important to task flows Well, continuing the procedure and method analogy, these subroutines have visibility, or scope, as we call it in task flows. A variable declared inside a procedure cannot be accessed by another procedure; it is private to that procedure. And for a Java method, a private member variable cannot be accessed from other classes and, furthermore, is private to each instance of an object instantiated from that class. The same is true for task flows, or more specifically, ADF Controller, where you can define objects, such as managed and backing beans, to have a scope. You can think of scope as being a piece of memory that you lease for a period of time. Objects within that memory can be referenced for the period of the lease. Once this lease is up, the memory is cleared. There are different scopes available, some of which are
Page Flow Available for the duration of a task flow View Available for the duration of a single page or page fragment
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