[英]JavaFX: TextFields displayed from array, array updated / increased on button click - how to force the scene to redraw the updated array
I have a program that displays animals and their names:我有一个显示动物及其名称的程序:
private int TOTAL_ANIMALS = 5;
private TextField[] animals;
private TextField[] names
public AnimalsApp {
animals = new TextField[TOTAL_ANIMALS];
names = new TextFields[TOTAL_ANIMALS];
for (int i = 0; i < TOTAL_ANIMALS; i++) {
animals[i] = new TextField();
names[i] = new TextField();
}
}
@Override
public void start(Stage primaryStage) {
GridPane grid = new GridPane();
...
for (int i = 0; i < TOTAL_ANIMALS; i++) {
grid.add(animals[i], 0, i);
grid.add(names[i], 1, i);
}
The method associated with Add animal
button:与Add animal
按钮相关的方法:
public void addAnimals() {
animals = Arrays.copyOf(animals, TOTAL_ANIMALS + 1);
names = Arrays.copyOf(names, TOTAL_ANIMALS + 1);
animals[TOTAL_ANIMALS] = new TextField();
names[TOTAL_ANIMALS] = new TextField();
TOTAL_ANIMALS++;
System.out.println("Animals updated");
}
The code inside addAnimals
does execute, but the new text field doesn't appear. addAnimals
中的代码会执行,但不会出现新的文本字段。 How should I fix it?我应该如何解决它?
You forgot to add the text fields to grid, just creating a textfield doesn't show it you need to add it to your like you did in your start function.您忘记将文本字段添加到网格中,仅创建一个文本字段不会显示您需要将其添加到您在开始 function 中所做的那样。 You would also need to make the GridPane a variable in the class.您还需要使 GridPane 成为 class 中的变量。
public void addAnimals() {
animals = Arrays.copyOf(animals, TOTAL_ANIMALS + 1);
names = Arrays.copyOf(names, TOTAL_ANIMALS + 1);
animals[TOTAL_ANIMALS] = new TextField();
names[TOTAL_ANIMALS] = new TextField();
grid.add(animals[TOTAL_ANIMALS], 0, TOTAL_ANIMALS);
grid.add(names[TOTAL_ANIMALS], 1, TOTAL_ANIMALS);
TOTAL_ANIMALS++;
System.out.println("Animals updated");
}
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