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UXML element Hash128Field
UXML element IMGUIContainer

UXML element HelpBox

A HelpBox displays a message to the user. You can set the type of message to display, such as a warning or an error. You can also set the message to display as rich text.

Create a HelpBox

You can create a HelpBox with UXML and C#. The following C# example creates a HelpBox with the message “Help text” and the information icon:

HelpBox helpBox = new HelpBox("Help text", HelpBoxMessageType.Info);

Example

The following UXML example creates a HelpBox with a warning message:

<UXML xmlns="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
    <HelpBox text="UXML Help Box" message-type="Info" name="the-uxml-help-box" />
</UXML>

The following C# example illustrates some of the customizable functionalities of the HelpBox:

/// <sample>
// Get a reference to the help box from UXML and update its text.
var uxmlHelpBox = container.Q<HelpBox>("the-uxml-help-box");
uxmlHelpBox.text += " (Updated in C#)";

// Create a new help box and give it a style class.
var csharpHelpBox = new HelpBox("This is a help box", HelpBoxMessageType.Warning);
csharpHelpBox.AddToClassList("some-styled-help-box");
container.Add(csharpHelpBox);
/// </sample>

To try this example live in Unity, go to Window > UI Toolkit > Samples.

C# base class and namespace

C# class: HelpBox
Namespace: UnityEngine.UIElements
Base class: VisualElement

Member UXML attributes

This element has the following member attributes:

Name Type Description
message-type UIElements.HelpBoxMessageType The type of message.
text string The message text.

Inherited UXML attributes

This element inherits the following attributes from its base class:

Name Type Description
focusable boolean True if the element can be focused.
tabindex int An integer used to sort focusables in the focus ring. Must be greater than or equal to zero.

This element also inherits the following attributes from VisualElement:

Name Type Description
content-container string Child elements are added to it, usually this is the same as the element itself.
data-source Object Assigns a data source to this VisualElement which overrides any inherited data source. This data source is inherited by all children.
data-source-path string Path from the data source to the value.
data-source-type System.Type The possible type of data source assignable to this VisualElement.

This information is only used by the UI Builder as a hint to provide some completion to the data source path field when the effective data source cannot be specified at design time.
language-direction UIElements.LanguageDirection Indicates the directionality of the element’s text. The value will propagate to the element’s children.

Setting the languageDirection to RTL adds basic support for right-to-left (RTL) by reversing the text and handling linebreaking and word wrapping appropriately. However, it does not provide comprehensive RTL support, as this would require text shaping, which includes the reordering of characters, and OpenType font feature support. Comprehensive RTL support is planned for future updates, which will involve additional APIs to handle language, script, and font feature specifications.

To enhance the RTL functionality of this property, users can explore available third-party plugins in the Unity Asset Store and make use of ITextElementExperimentalFeatures.renderedText
name string The name of this VisualElement.

Use this property to write USS selectors that target a specific element. The standard practice is to give an element a unique name.
picking-mode UIElements.PickingMode Determines if this element can be pick during mouseEvents or IPanel.Pick queries.
style string Sets the VisualElement style values.
tooltip string Text to display inside an information box after the user hovers the element for a small amount of time. This is only supported in the Editor UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary
.
usage-hints UIElements.UsageHints A combination of hint values that specify high-level intended usage patterns for the VisualElement. This property can only be set when the VisualElement is not yet part of a Panel. Once part of a Panel, this property becomes effectively read-only, and attempts to change it will throw an exception. The specification of proper UsageHints drives the system to make better decisions on how to process or accelerate certain operations based on the anticipated usage pattern. Note that those hints do not affect behavioral or visual results, but only affect the overall performance of the panel and the elements within. It’s advised to always consider specifying the proper UsageHints, but keep in mind that some UsageHints might be internally ignored under certain conditions (e.g. due to hardware limitations on the target platform).
view-data-key string Used for view data persistence, such as tree expanded states, scroll position, or zoom level.

This key is used to save and load the view data from the view data store. If you don’t set this key, the persistence is disabled for the associated VisualElement. For more information, refer to View data persistence.

USS classes

The following table lists all the C# public property names and their related USS selector.

C# property USS selector Description
ussClassName .unity-help-box The USS class name for Elements of this type.
labelUssClassName .unity-help-box__label The USS class name for labels in Elements of this type.
iconUssClassName .unity-help-box__icon The USS class name for images in Elements of this type.
iconInfoUssClassName .unity-help-box__icon--info The USS class name for the HelpBoxMessageType.Info state in Elements of this type.
iconwarningUssClassName .unity-help-box__icon--warning The USS class name for the HelpBoxMessageType.Warning state in Elements of this type.
iconErrorUssClassName .unity-help-box__icon--error The USS class name for the HelpBoxMessageType.Error state in Elements of this type.
disabledUssClassName .unity-disabled USS class name of local disabled elements.

You can also use the Matching Selectors section in the Inspector or the UI Toolkit Debugger to see which USS selectors affect the components of the VisualElement at every level of its hierarchy.

Additional resources

UXML element Hash128Field
UXML element IMGUIContainer