Version: 2022.1
Type selectors
Class selectors

Name selectors

USS name selectors match elements based on the name of an element. USS Name selectors are analogous to CSS ID selectors that match elements with a specific id attribute.

To set the name of an element:

  • In C# script, use VisualElement.name.
  • In UXML, use the name attribute. For example: <VisualElement name="my-nameName">.

To avoid unexpected matches, make element names unique within a panel.

Syntax

A name selector consists of an element’s assigned name prefixed with a number sign (#).

#ElementName { ... }

Note: Only use the number sign (#) when you write the selector in a USS file. Don’t use it when you assign the name to an element in a UXML or C# file. An element name that includes the number sign is invalid. For example <Button name="#OK" /> is invalid.

Example

To demonstrate how simple selectors match elements, here is an example UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary
Document.

<UXML xmlns="UnityEngine.UIElements">
  <VisualElement name="container1">
    <VisualElement name="container2" class="yellow">
      <Button name="OK" class="yellow" text="OK" />
      <Button name="Cancel" text="Cancel" />
    </VisualElement>
  </VisualElement>
</UXML>

With no styles applied, the UI looks like the following:

Example buttons with margins and thin blue borders.
Example buttons with margins and thin blue borders.

The following name selector style rule matches the second Button element.

#Cancel {
    border-width: 2px;
    border-color: DarkRed;
    background-color: pink;
}

The UI looks like the following when you apply the style:

The Cancel button has a dark red border and a pink background.
The Cancel button has a dark red border and a pink background.

Additional resources

Type selectors
Class selectors