在 JavaFX 中启用/禁用按钮
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Enabling/Disabling buttons in JavaFX
提问by user3505212
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.
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，我的一个按钮应该被禁用。我已经有了这个代码。
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);
}
is there an easier way to do this? Also if i add text into those areas shouldnt the button be re enable its self?
有没有更简单的方法来做到这一点？另外，如果我在这些区域添加文本，按钮不应该重新启用它自己吗？
采纳答案by ItachiUchiha
Create a BooleanBindingusing the textfield's textProperty()and then bind it with the Button's disableProperty().
BooleanBinding使用文本字段创建一个textProperty()，然后将其与按钮的disableProperty().
For enabling the button if any of the textfields is not empty.
用于在任何文本字段不为空时启用按钮。
// I have added 2 textFields, you can add more...
BooleanBinding booleanBind = Bindings.and(text1.textProperty().isEmpty(),
text2.textProperty().isEmpty());
button.disableProperty().bind(booleanBind);
For more than 2 textfields
对于超过 2 个文本字段
BooleanBinding booleanBind = Bindings.and(text1.textProperty().isEmpty(),
text2.textProperty().isEmpty()).and(text3.textProperty().isEmpty());
Or, a better approach is to use anddirectly on the property:
或者，更好的方法是and直接在属性上使用：
BooleanBinding booleanBind = text1.textProperty().isEmpty()
.and(text2.textProperty().isEmpty())
.and(text3.textProperty().isEmpty());
For enabling the button only if all of the textfields have text.
仅当所有文本字段都有文本时才启用按钮。
Just replace andwith or.
只需替换and为or.
BooleanBinding booleanBind = text1.textProperty().isEmpty()
.or(text2.textProperty().isEmpty())
.or(text3.textProperty().isEmpty());
回答by Mohsen Bahaloo
in swing we can disable a button as follow:
JButton start = new JButton("Start");
start.setEnabled(false);
在 Swing 中，我们可以禁用一个按钮，如下所示：
JButton start = new JButton("Start");
start.setEnabled(false);
but in javaFX this function(setEnabled) changed to setDisabled, so we can use this code in javaFX:
start.setDisable(false);
但是在javaFX中这个函数（setEnabled）变成了setDisabled，所以我们可以在javaFX中使用这个代码：
start.setDisable(false);
