Listening for <enter> key in a TextArea or TextField

Vaadin 6 / 7 / 8
1

Hi all,

I’m using Vaadin 8.3.1. I’m trying to listen for an event where the user presses the enter key. The Handler solution only seems to work for TextField:

public static class EnterKeyHandler implements Handler {

	private static final long serialVersionUID = 1L;

	private Action enterKeyShortcutAction = new ShortcutAction(null, ShortcutAction.KeyCode.ENTER, null);

	@Override
	public Action[] getActions(Object target, Object sender) {
		return new Action[] { enterKeyShortcutAction };
	}

	@Override
	public void handleAction(Action action, Object sender, Object target) {
		System.out.println("onEnterKey");
	}
}

But nothing seems to happen when enter is pressed in a TextArea. I tried adding a ShortcutListener but that didn’t work for either TextField or TextArea:

tf.addShortcutListener(new ShortcutListener("Enter", KeyCode.ENTER, null) {

	private static final long serialVersionUID = 1L;

	@Override
	public void handleAction(Object sender, Object target) {
		System.out.println("onEnterKey");
	}
});

Any thoughts?

Thanks!

William

2

You could probably use this add-on: https://vaadin.com/directory/component/keyactions

-Olli

3

Thanks. Are you saying that you do not know of a built-in Vaadin way of doing this?

4

I just tried using the KeyActions add-on and I’m now getting the following error when compiling the widgetset:

[INFO]
 Scanning for projects...
[INFO]
                                                                         
[INFO]
 ------------------------------------------------------------------------
[INFO]
 Building rom 1.0-SNAPSHOT
[INFO]
 ------------------------------------------------------------------------
[INFO]
 
[INFO]
 --- vaadin-maven-plugin:8.2.0:update-widgetset (default-cli) @ rom ---
[WARNING]
 GWT plugin is configured to detect modules, but none were found.
[INFO]
 No widgetsets found - generating AppWidgetset if necessary.
[INFO]
 Updating widgetset AppWidgetset
[INFO]
 Adding resource directory to command classpath: C:\Users\William\git\erom\ROM\src\main\resources
[INFO]
 Adding resource directory to command classpath: C:\Users\William\git\erom\ROM\target\generated-resources\gwt
[INFO]
 Using com.vaadin:vaadin-client version 8.3.1
[INFO]
 Using com.vaadin:vaadin-client-compiler version 8.3.1
[INFO]
 Widgetsets found from classpath:
[INFO]
 	org.vaadin.artur.WidgetSet in jar:file:C:/Users/William/.m2/repository/org/vaadin/artur/KeyActions/1.0.0/KeyActions-1.0.0.jar!/
[INFO]
 	com.vaadin.DefaultWidgetSet in jar:file:C:/Users/William/.m2/repository/com/vaadin/vaadin-client/8.3.1/vaadin-client-8.3.1.jar!/
[INFO]
 Addon styles found from classpath:
[INFO]
 
[INFO]
 Search took 17ms
[INFO]
 
[INFO]
 --- vaadin-maven-plugin:8.2.0:compile (default-cli) @ rom ---
[INFO]
 auto discovered modules [AppWidgetset]

[INFO]
 Using com.vaadin:vaadin-client version 8.3.1
[INFO]
 Using com.vaadin:vaadin-client-compiler version 8.3.1
[INFO]
 Compiling module AppWidgetset
[INFO]
 [ERROR]
 An internal compiler exception occurred
[INFO]
 com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:3997)
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:1569)
[INFO]
 	at org.eclipse.jdt.internal.compiler.ast.MessageSend.traverse(MessageSend.java:1021)
[INFO]
 	at org.eclipse.jdt.internal.compiler.ast.LocalDeclaration.traverse(LocalDeclaration.java:307)
[INFO]
 	at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:347)
[INFO]
 	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1490)
[INFO]
 	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1363)
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:3933)
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:3971)
[INFO]
 	at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:129)
[INFO]
 	at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:336)
[INFO]
 	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:470)
[INFO]
 	at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:1040)
[INFO]
 	at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:325)
[INFO]
 	at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:548)
[INFO]
 	at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:479)
[INFO]
 	at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:465)
[INFO]
 	at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:423)
[INFO]
 	at com.google.gwt.dev.Precompile.precompile(Precompile.java:222)
[INFO]
 	at com.google.gwt.dev.Precompile.precompile(Precompile.java:202)
[INFO]
 	at com.google.gwt.dev.Precompile.precompile(Precompile.java:143)
[INFO]
 	at com.google.gwt.dev.Compiler.compile(Compiler.java:204)
[INFO]
 	at com.google.gwt.dev.Compiler.compile(Compiler.java:155)
[INFO]
 	at com.google.gwt.dev.Compiler.compile(Compiler.java:144)
[INFO]
 	at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)
[INFO]
 	at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
[INFO]
 	at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
[INFO]
 	at com.google.gwt.dev.Compiler.main(Compiler.java:125)
[INFO]
 Caused by: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.ast.MessageSend.binding()Lorg/eclipse/jdt/internal/compiler/lookup/MethodBinding;
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder.isUncheckedGenericMethodCall(GwtAstBuilder.java:4220)
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder.access$1400(GwtAstBuilder.java:250)
[INFO]
 	at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:1562)
[INFO]
 	... 26 more
[INFO]
    [ERROR]
 at ClickableRenderer.java(182): WidgetUtil.findWidget(e)
[INFO]
       org.eclipse.jdt.internal.compiler.ast.MessageSend
[INFO]
 ------------------------------------------------------------------------
[INFO]
 BUILD FAILURE
[INFO]
 ------------------------------------------------------------------------
[INFO]
 Total time: 15.053 s
[INFO]
 Finished at: 2019-02-05T10:53:09-04:00
[INFO]
 Final Memory: 27M/339M
[INFO]
 ------------------------------------------------------------------------
[ERROR]
 Failed to execute goal com.vaadin:vaadin-maven-plugin:8.2.0:compile (default-cli) on project rom: Command [[
[ERROR]
 C:\Program Files\Java\jre1.8.0_144\bin\java -Xmx1G -Dgwt.persistentunitcache=false com.google.gwt.dev.Compiler -logLevel INFO -style OBF -war C:\Users\William\git\erom\ROM\target\classes\VAADIN\widgetsets -localWorkers 4 -failOnError -XfragmentCount -1 -sourceLevel auto -gen C:\Users\William\git\erom\ROM\target\.generated AppWidgetset
[ERROR]
 ]] failed with status 1
[ERROR]
 -> [Help 1]

[ERROR]
 
[ERROR]
 To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR]
 Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
 
[ERROR]
 For more information about the errors and possible solutions, please read the following articles:
[ERROR]
 [Help 1]
 http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

When I remove the KeyActions from my pom.xml then the widgetset compiles fine. I’m using Vaadin 8.3.1.

5

Thanks. Are you saying that you do not know of a built-in Vaadin way of doing this?

Not sure without investigating, but I’m guessing the TextArea is eating the enter key presses and the add-on could work around that maybe.

Could you be facing this error: https://stackoverflow.com/questions/41039097/gwt-error-constructing-java-ast ?

6

Thanks a bunch - that solved it. I had to use the latest version of gwt-dev though (2.8.0 gave a different error):

<dependency>
	<groupId>com.google.gwt</groupId>
	<artifactId>gwt-dev</artifactId>
	<version>2.8.2</version>
	<scope>provided</scope>
</dependency>