如何在 java fx 2 中更改 TextField 的文本
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how to change the text of TextField in java fx 2
提问by Bipin Bhandari
I have a TextFieldin which there is some text but I want to change that text on some event but I am getting the NullPointerException.
我有一个TextField其中有一些文本但我想在某个事件中更改该文本但我得到了NullPointerException.
I am using setText()method but still its not working. I am calling that function from other class .
我正在使用setText()方法，但仍然无法正常工作。我正在从其他类调用该函数。
Any Help?
任何帮助？
Thanks in advance.
提前致谢。
回答by Mike Baran
At beginning of the controller's class definition:
在控制器类定义的开头：
@FXML private TextField txtDescription;
Within the initialize method, add:
在 initialize 方法中，添加：
txtDescription = new TextField();
Within a method that acts on that text field, something like:
在作用于该文本字段的方法中，例如：
txtDescription.setText("This is my new text.");
回答by gokcand
Make sure that you have a TextField definition in your .fxmlfile with the following:
确保您的.fxml文件中有一个 TextField 定义，其中包含以下内容：
fx:id="myCoolTextField"
If you don't have that, init the text field in your display() method with the following:
如果没有，请使用以下内容在 display() 方法中初始化文本字段：
myCoolTextField = new TextField();
You may also override the special initialize()method. This method is being called every time your scene updated.
您还可以覆盖特殊的initialize()方法。每次更新场景时都会调用此方法。
@FXML
public void initialize() {
myCoolTextField.setText("Here is my updated text.");
}
