Figure 7 : Text Input Dialog Exampleįrom the Text Input Dialog window: Click the Get Text button to show a text input dialog. TextInputDialog extends Dialog class – note the Dialog‘s type is String and the result Optional‘s type is always a String. Text Input Dialog ExampleĪ text input dialog shows an input text field, into which the user can enter some text. The showAndWait() method returns an optional of type String this is because the dialog type is String. The constructor’s first argument defines the choice list’s default value and the second argument is the list item data. The choice dialog is constructed using a List collection of type String. The code: dialogData = Arrays.asList(arrayData) ĭialog = new ChoiceDialog(dialogData.get(0), dialogData) ĭtHeaderText("Select your choice") ĪtText("Selection: " + selected) If ((result.isPresent()) & (result.get() = ButtonType.OK)) If ((txt.isEmpty()) || (txt.length() result = alert.showAndWait() The following code shows how the dialog is created and displayed: String txt = textFld.getText().trim() Figure 3: Error Alert DialogĪfter closing error alert, note the status message shows “Invalid text entered: …”. Error Alertįrom the Alert Dialogs window: Enter some text less than 5 characters in length in the input text field and click the Save button. In case this is not set, and a default value is set as “Information”. The setHeaderText("some text") method sets the specified text as shown in the example’s picture above. Note the header text is set for this alert. Note that the dialog is not modal and is not re-sizeable this is the dialog’s default behaviour. The show() method displays the dialog this is a non-blocking method. Note the Alert‘s constructor takes the AlertType as an argument. String s ="This is an example of JavaFX 8 Dialogs. The following code shows how the dialog is created and displayed: Alert alert = new Alert(AlertType.INFORMATION) ĪtHeaderText("Information Alert") Information Alertįrom the Alert Dialogs window: Click the Info button to show an information type alert dialog. The example details the CONFIRMATION, ERROR and INFORMATION alerts. The enum constant values are: CONFIRMATION, ERROR, INFORMATION, NONE and WARNING. The alert types are defined as an enum AlertType. The alert dialogs are built using pre-built alert types to pre-populate various properties. Download Java Source Code at the bottom of this post. The complete code for all examples is included in the section 6. The following sections show example code snippets and screenshots. Note that JavaFX 8u40 (Java SE 8u40) is required to run the examples in this article. The example dialogs are configured with some of the above mentioned properties and features. The examples use pre-built dialogs, except the example with Dialog class has added controls. This article has four examples demonstrating the usage of Alert, ChoiceDialog, TextInputDialog and Dialog classes. There are methods to close and hide the dialog. Also, a result converter must be set whenever the dialog’s R type is not Void or ButtonType. Result Type ConverterĪ converter is used to convert the result type. For example, the dialog’s setOnShown(EventHandler value) method is run as the DIALOG_SHOWN event occurs on dialog, just after it is shown. There are dialog methods that can be used to capture the event actions. These are defined as DialogEvent class: DIALOG_CLOSE_REQUEST, DIALOG_HIDDEN, DIALOG_HIDING, DIALOG_SHOWING, DIALOG_SHOWN. There are events related to dialog showing and hiding actions. Note some properties are set by default for example all dialog’s are modal and not resizable by default. Various properties can be accessed and set using the dialog’s API – title, header text, content text, location, width/height, resizable and the graphic on the header or content. Configuring a DialogĪ dialog can be configured to add buttons, add content, set modality and define the blocking (and non-blocking) nature of the dialog.
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