Welcome
Developing
Developing EGL applications
Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
EGL Language Reference
The EGL Language Reference covers the fundamental use of the language, including its concepts, syntax, and keywords. This volume is intended for a developer writing EGL applications with some experience in procedural programming.
Applications with user interfaces
Text UI
A text UI application presents a text-based user interface similar to that of a 5250 or 3270 terminal.
EGL library converseLib
validationFailed()

Overview
Getting started
Installing
Upgrading and migrating
EGL Code Accelerator for IBD
Developing
- Model driven development of EGL code
- Generating source code from UML models
  You can use transformations to create source code from a UML model. First you must create a transformation parameters file and then apply those parameters to a model.
- Generating the EGL Dependency Graph from EGL projects
- Generating Source Code from OpenAPI Documents
- Developing EGL applications
  Enterprise Generation Language (EGL) is a programming language that you can use to focus on business problems instead of software technologies. Within the Rational® development environment, you can use EGL wizards and other tools to write complex applications with minimal effort.
  - How to use this documentation
  - Additional information about EGL
    The most recent EGL documentation is in the IBM Business Developer documentation.
  - EGL Programmer's Guide
    The EGL Programmer's Guide covers using EGL within the Eclipse Integrated Development Environment (IDE), as well as some of the common programming tasks that EGL developers perform.
  - EGL Generation Guide
    The EGL Generation Guide covers the process of converting EGL code to Java™ or COBOL source code, including the processes and the files involved. This section is intended for a developer who will generate or deploy EGL applications.
  - EGL Language Reference
    The EGL Language Reference covers the fundamental use of the language, including its concepts, syntax, and keywords. This volume is intended for a developer writing EGL applications with some experience in procedural programming.
    - General syntax
    - System data parts
    - User-defined data parts
    - Logic parts
    - Correspondence between a JSON string and an EGL variable
      This topic describes the EGL record that corresponds to a JavaScript™ Object Notation (JSON) string. Other topics describe the functions (serviceLib.convertFromJSON() and serviceLib.convertToJSON()) that are used by a Rich UI developer to convert JSON data to or from a variable, as may be necessary to access a third-party REST service. A failure in either function causes a RuntimeException.
    - Correspondence between a JSON string and an EGL variable for zOS and IBM i
      This topic describes the EGL record that corresponds to a JavaScript Object Notation (JSON) string. This topic describes the functions—serviceLib.convertFromJSON() and serviceLib.convertToJSON()—that are used by an EGL developer to convert JSON data to or from a variable either for zOS or IBM i systems. A failure in either function causes a RuntimeException.
    - Special considerations for JSON support on IBM i:
    - Correspondence between an XML string and an EGL variable
      This topic describes the EGL record that corresponds to an Extensible Markup Language (XML) string. Other topics describe the functions (serviceLib.convertFromXML and serviceLib.convertToXML) that are used by a Rich UI developer to convert XML data to or from a variable, as may be necessary to access a third-party REST service.
    - EGL statements
    - EGL core system libraries and variables
    - Accessing data in EGL
      Whenever you access a data store in EGL, the data goes into a record.
    - Applications with user interfaces
      - Enumerations for user interface properties and fields
      - Common UI statements
      - Common UI properties
      - Validation properties
      - Handler part
        A handler typically includes both variables and functions. It is used for basic processing and for user interaction.
      - Rich UI programming model
      - DojoLib
        The DojoLib library includes constants and validation functions used by the EGL Dojo widgets. The library is not a system library, and its use has prerequisites.
      - DojoMobileLib
        The DojoMobileLib widget defines constants that are used by EGL Dojo mobile widgets.
      - Reference to widgets
      - EGL reports
      - Text UI
        A text UI application presents a text-based user interface similar to that of a 5250 or 3270 terminal.
        Program part stereotype for Text UI
        Additional program properties for Text UI
        Introduction to Form parts
        CLEAR key
        Use the CLEAR key in a Text UI program to dismiss a form without validating input.
        Form fields
        Introduction to FormGroup parts
        FormGroup part
        The FormGroup is a main part; it resides in a source file that has the same name as the part.
        FormGroup properties
        use considerations for FormGroup parts
        Logical expressions for Text UI forms
        Segmentation in Text UI programs and UI programs
        EGL statements for Text UI
        Text UI uses two EGL statements not used anywhere else, in addition to several common EGL statements.
        Form field properties
        Modified data tag and modified property
        Enumerations for Text UI
        EGL library converseLib
        clearScreen()
        displayMsgNum()
        fieldInputLength()
        getColor()
        getCursorColumn()
        getCursorField()
        getCursorLine()
        getFormFieldName()
        getFormFieldNameUsingValidationOrder()
        getFormFieldOccurrence()
        getFormFieldValue()
        getHighlight()
        getIntensity()
        getProtect()
        isCursor()
        isModified()
        pageEject()
        setColor()
        setCursor()
        setCursorPosition()
        setFormFieldValue()
        setHighlight()
        setIntensity()
        setModified()
        setProtect()
        validationFailed()
        converseVar
      - Web transaction support in EGL
        Use EGL web transactions to migrate VisualAge® Generator web transactions to EGL.
    - VisualAge® Generator compatibility
    - Appendices
    - Importing product-supplied projects
      You can click a link to download the current version of Rich UI projects. The capability is useful if you deleted a project or want a clean version.
  - Rational® COBOL Runtime Guide for zSeries®
    This manual provides information about customizing and administering the IBM® Rational® COBOL Runtime.
  - IBM Business Developer EGL Server Guide for IBM® i
    This manual provides information about customizing and administering EGL Server for IBM® i on the host.
  - Generation for VSE Feature Reference
    This reference manual provides z/VSE-specific information about developing and generating EGL programs in the VSE environment.
- Source code analysis with code review
  With code review, you can create configurations of coding rules for EGL source code. You can then run the configurations to check the source code for consistency with the rules.
- Responsive Design Support in IBD
  What is Responsive Design? Responsive design is an approach for creation of web pages that automatically scales its content and elements to match the screen size on which it is viewed. So, instead of designing multiple websites for different devices with variable screen sizes, we can design just one website that scales up or down automatically, to match the device it’s being viewed on.
- Containerizing an EGL RUI Application
Samples
Troubleshooting and support
EGL runtime error messages
Reference
Glossary
Using the help
Notices for IBM Business Developer documentation

validationFailed()

The converseLib.validationFailed() system function is used in either of two ways:

If called in a field-validation function in a Text UI program, converseLib.validationFailed() causes the redisplay of the received text form after all validation functions are processed. The last-called converseLib.validationFailed() function determines the message that is displayed.
If possible, the message presentation is on the form itself, in the field to which the msgField form property refers. If the msgField has no value form property, the message is displayed previous to the display of the form, on a separate, modal screen.
If invoked outside a validation function, converseLib.validationFailed() presents the specified message the next time that a form is presented by a converse, display, print, or show statement. The behavior in this case is like that of converseLib.displayMsgNum().

In any case, the value assigned to converseLib.validationFailed() is stored in the converseVar.validationMsgNum system variable.

  converseLib.validationFailed([msgNumber INT in])

msgNumber: The number of the message to display. The argument must be an integer literal or a variable of primitive type SMALLINT or INT or the BIN equivalent. This number is compared against each cell in the first column of the program's message table, which is the data table to which the program's msgTablePrefix property refers. The retrieved message is in the second column of the same row.
The message number is 9999 by default.