在JavaFX中启用/禁用按钮 [英] Enabling/Disabling buttons in JavaFX

问题描述

如何在特定条件下禁用按钮？例如，我有许多文本字段和按钮，当这些文本字段为空时，应禁用其中一个按钮。我已经有了这段代码。

how do you disable buttons under a certain condition? For example, i have many text fields and buttons, when those text fields are empty one of my buttons should be disabled. i already have this code.

if(txtID.getText().isEmpty()&&txtG.getText().isEmpty()
            &&txtBP.getText().isEmpty()&&txtD.getText().isEmpty()
            &&txtSP.getText().isEmpty()&&txtCons.getText().isEmpty()){
       btnAdd.setDisable(true);
       }
else{
btnAdd.setDisable(false);
}

有更简单的方法吗？此外，如果我在这些区域添加文本，按钮是否应重新启用它自己？

is there an easier way to do this? Also if i add text into those areas shouldnt the button be re enable its self?

推荐答案

使用textfield的创建 BooleanBinding textProperty（）然后用Button的 disableProperty（）绑定它。

Create a BooleanBinding using the textfield's textProperty() and then bind it with the Button's disableProperty().

// I have added 2 textFields, you can add more...
BooleanBinding booleanBind = Bindings.and(text1.textProperty().isEmpty(),
                                              text2.textProperty().isEmpty());
button.disableProperty().bind(booleanBind);

超过2个文本字段

BooleanBinding booleanBind = Bindings.and(text1.textProperty().isEmpty(),
          text2.textProperty().isEmpty()).and(text3.textProperty().isEmpty());

或者，更好的方法是使用和直接在属性上：

Or, a better approach is to use and directly on the property:

BooleanBinding booleanBind = text1.textProperty().isEmpty()
                            .and(text2.textProperty().isEmpty())
                                      .and(text3.textProperty().isEmpty());

仅当所有文本字段都有文本时启用按钮。

只需用或替换和。

BooleanBinding booleanBind = text1.textProperty().isEmpty()
                            .or(text2.textProperty().isEmpty())
                                      .or(text3.textProperty().isEmpty());

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