search a word by key enter - javafx

Question

i have a problem with my searching method.
With this method, I can enter a word in the textfield and display the word in the textarea. However, this only happens once if i let it run. I need to expand it so, that every time I click on "enter," the program should continue with searching in the textarea. How can i do this?
And please give me code examples. i have only 2 days left for my presentation.
Thanks a lot for the helps
textfield.setOnKeyPressed(new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent event) {
if (event.getCode() == KeyCode.ENTER) {
String text = textarea.getText();
Labeled errorText = null;
if (textfield.getText() != null && !textfield.getText().isEmpty()) {
index = textarea.getText().indexOf(textfield.getText());
textarea.getText();
if (index == -1) {
errorText.setText("Search key Not in the text");
} else {
// errorText.setText("Found");
textarea.selectRange(index, index + textfield.getLength());
}
}
}
}
});

Answer 1

There's an overloaded version of the indexOf method allowing you to search starting at a specific index. Keep track of the index of your last find and start searching from this position:
#Override
public void start(Stage primaryStage) throws Exception {
TextField textField = new TextField("foo");
TextArea textarea = new TextArea();
for (int i = 0; i < 10; i++) {
textarea.appendText("foo\nbarfoobarfoofoo\n");
}
textField.setOnAction(evt -> {
String searchText = textField.getText();
if (searchText.isEmpty()) {
return; // searching for empty text doesn't make sense
}
int index = textarea.getSelection().getEnd();
// in case of the first search, start at the beginning
// TODO: adjust condition/starting index according to needs
if (textarea.getSelection().getLength() == 0) {
index = 0;
}
// find next occurrence
int newStartIndex = textarea.getText().indexOf(searchText, index);
// mark occurrence
if (newStartIndex >= 0) {
textarea.selectRange(newStartIndex, newStartIndex + searchText.length());
}
});
Scene scene = new Scene(new VBox(textField, textarea));
primaryStage.setScene(scene);
primaryStage.show();
}
Edit
If you are not satisfied with searching the element after the selection ( or after the cursor, if there is no range selected), you could save the data of the end of the last match:
#Override
public void start(Stage primaryStage) throws Exception {
TextField textField = new TextField("foo");
TextArea textarea = new TextArea();
for (int i = 0; i < 10; i++) {
textarea.appendText("foo\nbarfoobarfoofoo\n");
}
class SearchHandler implements EventHandler<ActionEvent> {
int index = 0;
#Override
public void handle(ActionEvent event) {
String searchText = textField.getText();
String fullText = textarea.getText();
if (index + searchText.length() > fullText.length()) {
// no more matches possible
// TODO: notify user
return;
}
// find next occurrence
int newStartIndex = textarea.getText().indexOf(searchText, index);
// mark occurrence
if (newStartIndex >= 0) {
index = newStartIndex + searchText.length();
textarea.selectRange(newStartIndex, index);
} else {
index = fullText.length();
// TODO: notify user
}
}
}
SearchHandler handler = new SearchHandler();
textField.setOnAction(handler);
// reset index to search from start when changing the text of the TextField
textField.textProperty().addListener((o, oldValue, newValue) -> handler.index = 0);
Scene scene = new Scene(new VBox(textField, textarea));
primaryStage.setScene(scene);
primaryStage.show();
}