本文介绍了JavaFX TextField自动建议的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想让这个TextField具有像Lucene一样的建议功能。我搜索了所有的网页，我发现它只适用于ComboBox。
TextField instNameTxtFld = instNameTxtFld（）;
private TextField instNameTxtFld（）{
TextField txtFld = new TextField（）;
txtFld.setPrefSize（600,75）;
返回txtFld;
}
我不能将该方法用于ComboBox的原因是因为我可以如果我使用ComboBox，请将值输入到下面的数据库。
private void goNext（）{
if（nameTxtFld.getText（）== null || nameTxtFld.getText（）。trim（）。isEmpty（）
|| instNameTxtFld.getText（）== null || instNameTxtFld.getText（）。trim（ ）.isEmpty（）
|| addTxtArea.getText（）== null || addTxtArea.getText（）。trim（）。isEmpty（））{
alertDialog.showAndWait（）;
} else {
String satu = idNumTxtFld.getText（）;
String dua = nameTxtFld.getText（）;
String tiga = addTxtArea.getText（）;
String empat = instNameTxtFld.getText（）;
int delapan = idType.getSelectionModel（）。getSelectedIndex（）;
String sembilan = timeStamp.getText（）;
try {
KonekDB.createConnection（）;
语句st = KonekDB.conn.createStatement（）;
String sql =INSERT INTO privateguest
+（idNumber，name，address，institution，idType，startTime）
+VALUES
+（'+ satu +'，'+ dua +'，'+ tiga +'，'+ empat +'，'+ delapan +'，'+ sembilan +'）;
System.out.println（sql）;
st.executeUpdate（sql）;
} catch（SQLException ex）{
System.out.println（satu ++ dua ++ tiga ++ empat ++ delapan ++ sembilan）;
System.out.println（SQL异常（下一个））;
ex.printStackTrace（）;
}
Frame3Private frame3 = new Frame3Private（英文）;
this.getScene（）。setRoot（frame3）;
}
}
请帮助我充分利用执行TextField建议/自动完成的简单代码。
解决方案
这是我的解决方案，基于
希望有所帮助。
I want to make this TextField have suggestions feature just like in Lucene. I've searched all the web and I just find it for ComboBox.
TextField instNameTxtFld = instNameTxtFld();
private TextField instNameTxtFld() {
TextField txtFld = new TextField();
txtFld.setPrefSize(600, 75);
return txtFld;
}
The reason that I can't use the method for ComboBox is because I can't input the value to database below if I use ComboBox.
private void goNext() {
if (nameTxtFld.getText() == null || nameTxtFld.getText().trim().isEmpty()
|| instNameTxtFld.getText()== null || instNameTxtFld.getText().trim().isEmpty()
|| addTxtArea.getText() == null || addTxtArea.getText().trim().isEmpty()) {
alertDialog.showAndWait();
} else {
String satu = idNumTxtFld.getText();
String dua = nameTxtFld.getText();
String tiga = addTxtArea.getText();
String empat = instNameTxtFld.getText();
int delapan = idType.getSelectionModel().getSelectedIndex();
String sembilan = timeStamp.getText();
try {
KonekDB.createConnection();
Statement st = KonekDB.conn.createStatement();
String sql = "INSERT INTO privateguest"
+ "(idNumber, name, address, institution, idType, startTime) "
+ "VALUES "
+ "('" + satu + "','" + dua + "','" + tiga + "','" + empat + "','" + delapan + "','" + sembilan + "')";
System.out.println(sql);
st.executeUpdate(sql);
} catch (SQLException ex) {
System.out.println(satu + " " + dua + " " + tiga + " " + empat + " " + delapan + " " + sembilan);
System.out.println("SQL Exception (next)");
ex.printStackTrace();
}
Frame3Private frame3 = new Frame3Private(english);
this.getScene().setRoot(frame3);
}
}
Please help me to make the most simple code for doing TextField suggestions/ auto-complete.
解决方案
Here is my solution based on This.
public class AutocompletionlTextField extends TextFieldWithLengthLimit {
//Local variables
//entries to autocomplete
private final SortedSet<String> entries;
//popup GUI
private ContextMenu entriesPopup;
public AutocompletionlTextField() {
super();
this.entries = new TreeSet<>();
this.entriesPopup = new ContextMenu();
setListner();
}
/**
* wrapper for default constructor with setting of "TextFieldWithLengthLimit" LengthLimit
*
* @param lengthLimit
*/
public AutocompletionlTextField(int lengthLimit) {
this();
super.setLengthLimit(lengthLimit);
}
/**
* "Suggestion" specific listners
*/
private void setListner() {
//Add "suggestions" by changing text
textProperty().addListener((observable, oldValue, newValue) -> {
String enteredText = getText();
//always hide suggestion if nothing has been entered (only "spacebars" are dissalowed in TextFieldWithLengthLimit)
if (enteredText == null || enteredText.isEmpty()) {
entriesPopup.hide();
} else {
//filter all possible suggestions depends on "Text", case insensitive
List<String> filteredEntries = entries.stream()
.filter(e -> e.toLowerCase().contains(enteredText.toLowerCase()))
.collect(Collectors.toList());
//some suggestions are found
if (!filteredEntries.isEmpty()) {
//build popup - list of "CustomMenuItem"
populatePopup(filteredEntries, enteredText);
if (!entriesPopup.isShowing()) { //optional
entriesPopup.show(AutocompletionlTextField.this, Side.BOTTOM, 0, 0); //position of popup
}
//no suggestions -> hide
} else {
entriesPopup.hide();
}
}
});
//Hide always by focus-in (optional) and out
focusedProperty().addListener((observableValue, oldValue, newValue) -> {
entriesPopup.hide();
});
}
/**
* Populate the entry set with the given search results. Display is limited to 10 entries, for performance.
*
* @param searchResult The set of matching strings.
*/
private void populatePopup(List<String> searchResult, String searchReauest) {
//List of "suggestions"
List<CustomMenuItem> menuItems = new LinkedList<>();
//List size - 10 or founded suggestions count
int maxEntries = 10;
int count = Math.min(searchResult.size(), maxEntries);
//Build list as set of labels
for (int i = 0; i < count; i++) {
final String result = searchResult.get(i);
//label with graphic (text flow) to highlight founded subtext in suggestions
Label entryLabel = new Label();
entryLabel.setGraphic(Styles.buildTextFlow(result, searchReauest));
entryLabel.setPrefHeight(10); //don't sure why it's changed with "graphic"
CustomMenuItem item = new CustomMenuItem(entryLabel, true);
menuItems.add(item);
//if any suggestion is select set it into text and close popup
item.setOnAction(actionEvent -> {
setText(result);
positionCaret(result.length());
entriesPopup.hide();
});
}
//"Refresh" context menu
entriesPopup.getItems().clear();
entriesPopup.getItems().addAll(menuItems);
}
/**
* Get the existing set of autocomplete entries.
*
* @return The existing autocomplete entries.
*/
public SortedSet<String> getEntries() { return entries; }
}
You must extends from "TextField" instead of "TextFieldWithLengthLimit" and delete constructor with "Length limit".
I use static methods to work with Styles. It's used here to "highlight" entered text inside suggestion results. Here is the code of methos from this class:
/**
* Build TextFlow with selected text. Return "case" dependent.
*
* @param text - string with text
* @param filter - string to select in text
* @return - TextFlow
*/
public static TextFlow buildTextFlow(String text, String filter) {
int filterIndex = text.toLowerCase().indexOf(filter.toLowerCase());
Text textBefore = new Text(text.substring(0, filterIndex));
Text textAfter = new Text(text.substring(filterIndex + filter.length()));
Text textFilter = new Text(text.substring(filterIndex, filterIndex + filter.length())); //instead of "filter" to keep all "case sensitive"
textFilter.setFill(Color.ORANGE);
textFilter.setFont(Font.font("Helvetica", FontWeight.BOLD, 12));
return new TextFlow(textBefore, textFilter, textAfter);
}
You may add this "AutocompletionlTextField" in FXML (dont forget about "imports") or inside constructor. To set "suggestions" list on use "entries" getter:
AutocompletionlTextField field = new AutocompletionlTextField();
field.getEntries().addAll(YOUR_ARRAY_OF_STRINGS);
It seems like that in my application:
Hope it helps.
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