OpenHarmony @CnapData

Generally, the <Navigation> component functions as the root container of a page and supports three display modes: single-page, column, and adaptive. It is applicable to page redirection within a module and useful in one-time development for multi-device deployment. Draw on this component's routing capability to create a smooth page transition experience, and explore its various title bar styles to present titles seamlessly linked with the content. In one-time development for multi-device deployment scenarios, the <Navigation> component can automatically adapt to the window size; when the window is large enough, it automatically displays content in columns.

The pages of the <Navigation> component include the home page and content page. The home page consists of the title bar, content area, and toolbar. You can use <NavRouter> as a child component in the content area to implement a navigation bar. The content page displays the content of the <NavDestination> child component.

As a special child component of <Navigation>, <NavRouter> provides default processing logic for responding to clicks, eliminating the need for manual logic definition. It has only two child components, the second of which must be <NavDestination>. As a special child component of <NavRouter>, <NavDestination> makes up the content page of the <Navigation> component. When the user clicks the <NavRouter> component, the corresponding <NavDestination> content area is displayed.

Setting the Page Display Mode

The <Navigation> component uses the mode attribute to set the page display mode.

Adaptive Mode

By default, the <Navigation> component is in adaptive mode. In this case, the mode attribute is NavigationMode.Auto. In adaptive mode, when the device width is greater than 520 vp, the <Navigation> component uses the column mode. Otherwise, the <Navigation> component uses the single-page mode.
```
Navigation() {
  ...
}
.mode(NavigationMode.Auto)
```
Single-page mode

Figure 1 Single-page mode

Set mode to NavigationMode.Stack so that the <Navigation> component is displayed on a single page.
```
Navigation() {
  ...
}
.mode(NavigationMode.Stack)
```

Column mode

Figure 2 Column mode

en-us_image_0000001562820845

Set mode to NavigationMode.Split so that the <Navigation> component is displayed in columns.

@Entry
@Component
struct NavigationExample {
  @State TooTmp: ToolbarItem = {'value': "func", 'icon': "./image/ic_public_highlights.svg", 'action': ()=> {}}
  private arr: number[] = [1, 2, 3];

  build() {
    Column() {
      Navigation() {
        TextInput({ placeholder: 'search...' })
          .width("90%")
          .height(40)
          .backgroundColor('#FFFFFF')

        List({ space: 12 }) {
          ForEach(this.arr, (item:string) => {
            ListItem() {
              NavRouter() {
                Text("NavRouter" + item)
                  .width("100%")
                  .height(72)
                  .backgroundColor('#FFFFFF')
                  .borderRadius(24)
                  .fontSize(16)
                  .fontWeight(500)
                  .textAlign(TextAlign.Center)
                NavDestination() {
                  Text("NavDestinationContent" + item)
                }
                .title("NavDestinationTitle" + item)
              }
            }
          }, (item:string):string => item)
        }
        .width("90%")
        .margin({ top: 12 })
      }
      .title ("Main Title")
      .mode(NavigationMode.Split)
      .menus([
        {value: "", icon: "./image/ic_public_search.svg", action: ()=> {}},
        {value: "", icon: "./image/ic_public_add.svg", action: ()=> {}},
        {value: "", icon: "./image/ic_public_add.svg", action: ()=> {}},
        {value: "", icon: "./image/ic_public_add.svg", action: ()=> {}},
        {value: "", icon: "./image/ic_public_add.svg", action: ()=> {}}
      ])
      .toolbarConfiguration([this.TooTmp, this.TooTmp, this.TooTmp])
    }
    .height('100%')
    .width('100%')
    .backgroundColor('#F1F3F5')
  }
}

column

Setting the Title Bar Mode

The title bar is on the top of the page and is used to display the page name and operation entry. The <Navigation> component uses the titleMode attribute to set the title bar mode.

Mini mode Applicable when the title of a level-1 page does not need to be highlighted.

Figure 3 Title bar in Mini mode
```
Navigation() {
  ...
}
.titleMode(NavigationTitleMode.Mini)
```
Full mode Applicable when the title of a level-1 page needs to be highlighted.

Figure 4 Title bar in Full mode
```
Navigation() {
  ...
}
.titleMode(NavigationTitleMode.Full)
```

The menu bar is in the upper right corner of the <Navigation> component. You can set the menu bar through the menus attribute, which supports two parameter types: Array<NavigationMenuItem> and CustomBuilder. When the Array<NavigationMenuItem> type is used, a maximum of three icons can be displayed in portrait mode and a maximum of five icons can be displayed in landscape mode. Extra icons will be placed in the automatically generated More icons.

Figure 5 Menu bar with three icons

let TooTmp: NavigationMenuItem = {'value': "", 'icon': "./image/ic_public_highlights.svg", 'action': ()=> {}}
Navigation() {
  ...
}
.menus([TooTmp,
  TooTmp,
  TooTmp])

Figure 6 Menu bar with four icons

let TooTmp: NavigationMenuItem = {'value': "", 'icon': "./image/ic_public_highlights.svg", 'action': ()=> {}}
Navigation() {
  ...
}
.menus([TooTmp,
  TooTmp,
  TooTmp,
  TooTmp])

The toolbar is located at the bottom of the <Navigation> component. You can set the toolbar through the toolBar attribute.

Figure 7 Toolbar

free3

let TooTmp: ToolbarItem = {'value': "func", 'icon': "./image/ic_public_highlights.svg", 'action': ()=> {}}
let TooBar: ToolbarItem[] = [TooTmp,TooTmp,TooTmp]
Navigation() {
  ...
}
.toolbarConfiguration(TooBar)

Navigation

Setting the Page Display Mode

Setting the Title Bar Mode

Setting the Menu Bar

Setting the Toolbar