JavaFX 中的 fx:id 和 id: 有什么区别？
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What's the difference between fx:id and id: in JavaFX?
提问by Analyst
Maybe a really newbie's question....
也许一个真正的新手的问题......
I'm starting learning JavaFX in a FMXL Application using the Scene Builder, by reading this tutorials:
通过阅读本教程，我开始使用 Scene Builder 在 FMXL 应用程序中学习 JavaFX：
http://docs.oracle.com/javase/8/javafx/get-started-tutorial/fxml_tutorial.htm
http://docs.oracle.com/javase/8/javafx/get-started-tutorial/fxml_tutorial.htm
So once i applied some changes, an issue with this 2 IDs came up... I might have missed or confused something about them...
因此，一旦我应用了一些更改，就会出现这 2 个 ID 的问题......我可能错过了或混淆了它们......
Can anyone tell me in which cases they are used one or another?
谁能告诉我在哪些情况下使用它们？
采纳答案by Patrick
idyou use to set a CSS IDto your Component, for example <Text id="welcome-text" .../>and in your stylesheet you have something like #welcome-text { font-size: 16pt; }so this will be applied to your Text.
id例如，您用来为您的组件设置CSS ID，<Text id="welcome-text" .../>并且在您的样式表中，您有类似的内容，#welcome-text { font-size: 16pt; }因此这将应用于您的Text.
fx:idyou use if you want to work with your Components in your Controller class, where you annotate them with @FXML Text myWelcomeText.
fx:id如果你想在你的控制器类中使用你的组件，你可以使用，在那里你用@FXML Text myWelcomeText.
回答by Lucas Z.
The fx:id is the identity associated to component in fxml to build a controller, and the id is used for css.
fx:id 是与 fxml 中组件关联的标识，用于构建控制器，该 id 用于 css。
回答by Cobbles
I took a look at an FXML document generated using the JavaFX Scene Builder. You access controls from Java Controller with the fx:id. (edit) I stand corrected, the id does matter.
我查看了使用JavaFX Scene Builder生成的 FXML 文档。您可以使用 fx:id 从 Java 控制器访问控件。（编辑）我更正了，id 很重要。
You can apply css from the FXML document like this:
您可以像这样从 FXML 文档中应用 css：
<Slider id="css_id" fx:id="myslider" styleClass="style_name" .../>
(Replace slider with any control)
（用任何控件替换滑块）
And Java controller interaction:
与Java控制器交互：
@FXML
Slider myslider;
回答by Amita Patil
In JavaFX idis used to set a CSS ID to a component. And fx:idis used for accessing that component in code (i.e. in a controller class). fx:idworks like a components name.
在 JavaFXid中用于为组件设置 CSS ID。并且fx:id用于在代码中访问该组件（即在控制器类中）。fx:id像组件名称一样工作。
