![]() For this example, we'll add a paragraph component for entering comments and we will only display it when the expense amount is greater than $100. Because interfaces are defined using expressions, the full expression library can be used to add dynamic behavior to the interface. Conditionally Show Interface ComponentsĪ common design requirement is to only display a component based on a condition. Keep this window open so you can quickly modify the interface as we continue through the following sections. For Display Value and Save Input To, select ri!expenseAmountĬlick SAVE.Follow the same steps for the Decimal field and change the following parameters:.For Display Value and Save Input To, select ri!expenseDate.Follow the same steps for the Date field and change the following parameters:.For Save Input To select ri!expenseItem.For Display Value select ri!expenseItem.From the COMPONENT CONFIGURATION pane on the right, change the following parameters:.Click on the Text component to select it.Now that we have the components, let's configure them. You should be left with nothing but the form layout and the cancel and submit buttons.įrom the COMPONENT PALETTE on the left, in the INPUTS section, drag a TEXT component, a DATE component, and a DECIMAL component into the Form Layout.From the EDIT view, click on the title Form to select the Form Layout.įrom the COMPONENT CONFIGURATION pane on the right, replace the Label field value with Submit Expense Report.ĭelete both Section layouts by clicking on them to select them, then from the context menu choose Delete.We'll start by choosing a layout, then adding a few components to it:įrom the templates panel on the right, under the FORMS section, choose One Column Form. In this section, we'll be adding components to our interface in Design Mode. From the RULE INPUTS pane on the right, create rule inputs by clicking New Interface Input ( + button): Create Rule InputsĮach form input saves its value into a variable, so let's add the variables. If you don't see a new tab, check your browser to see if you have pop-ups enabled. The newly created interface will open in a new tab by default. For Save In, use the picker to select the Examples folder.Enter expenseReportForm in the Name field.In the Create Interface dialog, complete the following fields:.To start, we will create an interface named expenseReportForm, and store it in the Examples folder: Each design object that you create during the course of this tutorial will appear in this list and be associated with the tutorial application. Optionally, in the Description field, add a short description.In the Name field, type Appian Tutorial.Log in to Appian Designer (for example, /suite/design).To create the Appian Tutorial application If you have already created the tutorial application, skip the steps below. Interfaces cannot be instantiatedthey can only be implemented by classes or extended by other interfaces.The tutorial application only needs to be created once. Method bodies exist only for default methods and static methods. In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. In fact, each group considers its software highly proprietary and reserves the right to modify it at any time, as long as it continues to adhere to the published interface. Neither industrial group needs to know how the other group's software is implemented. The guidance manufacturers can then write software that invokes the methods described in the interface to command the car. The auto manufacturers must publish an industry-standard interface that spells out in detail what methods can be invoked to make the car move (any car, from any manufacturer). Another industrial group, electronic guidance instrument manufacturers, make computer systems that receive GPS (Global Positioning System) position data and wireless transmission of traffic conditions and use that information to drive the car. Automobile manufacturers write software (Java, of course) that operates the automobilestop, start, accelerate, turn left, and so forth. Generally speaking, interfaces are such contracts.įor example, imagine a futuristic society where computer-controlled robotic cars transport passengers through city streets without a human operator. Each group should be able to write their code without any knowledge of how the other group's code is written. There are a number of situations in software engineering when it is important for disparate groups of programmers to agree to a "contract" that spells out how their software interacts.
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