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Variables and parameters in application development

Understanding variables in application development

Click here to learn about the types of variables available and how to use them in application development.

Input parameters

The input parameters are used to provide data to a field. They can be created within a page and passed from one page to another. Input parameters can be used within a page as well as passed to other pages. For example, you can pass an instance ID and activity instance ID to a process form from another process item using input parameters.

In the application builder > pages, the input parameters are found on the right side under the General properties tab ().

To create an input parameter:

  1. Click the Add button ().
  2. Enter the parameter name.
  3. Add a description to the parameter if needed.
  4. Click Add to add the new parameter. You can also edit or delete a parameter later.

     

 

Event parameters

These are parameters passed from an event within a component. An event parameter can be created by selecting a component, going to the Event properties tab, adding an event, and selecting the action and page for redirection.

For example, an instance ID and activity ID can be passed through an onClick event that redirects to another page.

 

Configuration properties

These are constants that have the same value throughout the application across different environments such as development and production. They can be set with a default value and can be changed during runtime. For example, an API key can be a config property.

Comparing variables and parameters

Type

Scope

Where can it be defined?

Usage

Example

Global variables

Across all environments of the application

Variables section in app builder, inside a page

JavaScript code

User email

Local variables

Page

Inside a page

JavaScript code

Page ID

Input parameters

Page

General properties of the page body

Used across components, JavaScript code

Application ID

Event parameters

Page/application depending upon whether it is passed on

Event properties of a component

JavaScript code, passing values to input parameters of another page

Instance ID

Config property

Across all environments of the app

Inside an app, as a constant

JavaScript code 

API key

 

Usage in JavaScript editor

JavaScript code can be added to an event within a component by opening the code editor under the Event properties of the component and selecting the JavaScript action. Once the code editor is open, you can use application variables, popups, event parameters, and input parameters by double-clicking on their names to define them within the code.

 

 

In summary, variables, input parameters, event parameters, and configuration properties are all used in application development to store and pass data within the application. Each has its own scope, usage, and examples of when they might be used in a real-world application.

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