ShowNode class

Conditional rendering primitive.

Mounts child when when evaluates to true, and optional fallback when when evaluates to false.

DOM Mounting and Sentinels

In the browser, ShowNode mounts between sentinel comments: <!-- bloom:show --> and <!-- /bloom:show -->.

Evaluates when inside a signal effect. When the boolean result transitions between true and false, the previous branch's scoped region is disposed and the active branch (child or fallback) is mounted between the sentinels. If fallback is null and when is false, an empty fragment is mounted.

SSR Behavior

During SSR (renderToHtml), when is evaluated once synchronously. If true, child is rendered; if false, fallback is rendered (or nothing if null).

Usually created using the DSL sugar Show.

Inheritance

• Object
• BloomNode
• ShowNode

Constructors

ShowNode(bool when(), {required BloomNode child, BloomNode? fallback})

Creates a conditional rendering descriptor with predicate when, primary child, and optional fallback.

const

Properties

child → BloomNode

The descriptor tree rendered when when evaluates to true.

final

fallback → BloomNode?

Optional descriptor tree rendered when when evaluates to false.

final

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

when → bool Function()

Reactive predicate — called inside a signals effect (browser) or once (SSR).

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited