harmony 鸿蒙NavRouter

2022-12-13
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NavRouter

The <NavRouter> component provides default processing logic for responding to clicks, eliminating the need for manual logic definition.

NOTE

This component is supported since API version 9. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

This component must contain two child components, the second of which must be <NavDestination>.

NOTE

If there is only one child component, the navigation to the <NavDestination> component does not work.

If there is only the <NavDestination> child component, the navigation does not work.

If there are more than two child components, the excess child components are not displayed.

If the second child component is not <NavDestination>, the navigation does not work.

APIs

NavRouter

NavRouter()

NavRouter¹⁰⁺

NavRouter(value: RouteInfo)

Provides route information so that clicking the <NavRouter> component redirects the user to the specified navigation destination page.

Parameters

Name	Type	Mandatory	Description
value	RouteInfo	No	Route information.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Description
mode	NavRouteMode	Route mode used for redirection. Default value: NavRouteMode.PUSH_WITH_RECREATE

RouteInfo¹⁰⁺

Name	Type	Mandatory	Description
name	string	Yes	Name of the navigation destination page to be redirected to.
param	unknown	No	Parameter transferred during redirection.

NavRouteMode

Name	Description
PUSH_WITH_RECREATE	The new navigation destination page replaces the current one. The current page is destroyed, but the information about this page is retained in the navigation stack.
PUSH	The new navigation destination page overwrites the current one. The current page is not destroyed, and the information about this page is retained in the navigation stack.
REPLACE	The new navigation destination page replaces the current one. The current page is destroyed, and the information about this page is removed from the navigation stack.

Events

Name	Description
onStateChange(callback: (isActivated: boolean) => void)	Called when the component activation status changes. The value true means that component is activated, and false means the opposite. NOTE onStateChange(true) is called when the <NavRouter> component is activated and its <NavDestination> child component is loaded. onStateChange(false) is called when the <NavDestination> child component is not displayed.

Example

// xxx.ets
@Entry
@Component
struct NavRouterExample {
  private arr: number[] = [0, 1, 2, 3]
  @State isActive: boolean = false
  @State dex: number = -1

  build() {
    Column() {
      Navigation() {
        List({ space: 12, initialIndex: 0 }) {
          ForEach(this.arr, (item: number, index: number = 0) => {
            ListItem() {
              NavRouter() {
                Row() {
                  Image($r('app.media.icon')).width(30).height(30).borderRadius(30).margin({ left: 3, right: 10 })
                  Text(`NavRouter${item + 1}`)
                    .fontSize(22)
                    .fontWeight(500)
                    .textAlign(TextAlign.Center)
                }
                .width(180)
                .height(72)
                .backgroundColor(this.dex === index ? '#ccc' : '#fff')
                .borderRadius(24)

                NavDestination() {
                  Text (`I am NavDestination page ${item + 1}`).fontSize (50)
                  Flex({ direction: FlexDirection.Row }) {
                    Row() {
                      Image($r('app.media.icon')).width(40).height(40).borderRadius(40).margin({ right: 15 })
                      Text('7 classes today').fontSize(30)
                    }.padding({ left: 15 })
                  }
                }.backgroundColor('#ccc')
                .title(`NavDestination${item + 1}`)
              }.onStateChange((isActivated: boolean) => {
                if(isActivated) {
                  this.dex = index;
                }
              })
            }
          }, (item:number) => item.toString())
        }
        .height('100%')
        .margin({ top: 12, left: 12 })
      }
      .mode(NavigationMode.Split)
      .hideTitleBar(true)
      .hideToolBar(true)
    }.height('100%')
  }
}