Detecting Mappings in Components
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Note
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Use Lit templates instead
Lit templates are recommended. Polymer templates are available in the next long term supported Vaadin version (LTS), but they are deprecated.
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You can detect whether a component is part of a Polymer template using the isTemplateMapped method.
This is useful if you want to execute custom logic depending on whether the component was mapped in a template (injected via the @Id or @Uses annotations) or created directly using one of its constructors, for example.
Example: Calling the isTemplateMapped method in MyComponent.
@Tag("div")
public class MyComponent extends Div {
public MyComponent() {
if (!isTemplateMapped()) {
getElement().getStyle().set("color", "red");
}
}
}-
By default, the component only sets a style when the component is not part of a template.
See Binding Components from a PolymerTemplate for more about To @Id mappings.
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