在角度树中为页面导航添加路由答案

【问题标题】：Adding routing for page navigation in angular tree在角度树中为页面导航添加路由
【发布时间】：2019-05-16 06:34:03
【问题描述】：

我在向 Angular 树添加路由方面需要帮助。

HTML 代码：

<mat-tree [dataSource]="dataSource" class="tree-container" [treeControl]="treeControl">
     <mat-tree-node class="btnLinks" *matTreeNodeDef="let node" matTreeNodePadding>
      <button mat-icon-button disabled></button>
      {{node.name}}
    </mat-tree-node>
    <mat-tree-node class="btnLinks" *matTreeNodeDef="let node;when: hasChild" matTreeNodePadding>
      <button mat-icon-button matTreeNodeToggle
              [attr.aria-label]="'toggle ' + node.name">
        <mat-icon class="mat-icon-rtl-mirror">
          {{treeControl.isExpanded(node) ? 'expand_more' : 'chevron_right'}}
        </mat-icon>
      </button>
      {{node.name}}
    </mat-tree-node>
  </mat-tree>

.ts 文件

interface ProfileList {
  name: string;
  children?: ProfileList[];
}

const PROFILE_DATA: ProfileList[] = [
  {
    name: 'General',
  }, 
  {
    name: 'Degrees',
  },
];

/** Flat node with expandable and level information */
interface TreeFlatNode {
  expandable: boolean;
  name: string;
  level: number;
}

@Component({
  selector: 'mpn-profile-landing',
  templateUrl: './profile-landing.component.html',
  styleUrls: ['./profile-landing.component.css']
})

export class ProfileLandingComponent {

  public selectedItem : String = '';

  constructor(private breakpointObserver: BreakpointObserver) {
    this.dataSource.data = PROFILE_DATA;
  }

private transformer = (node: ProfileList, level: number) => {
    return {
      expandable: !!node.children && node.children.length > 0,
      name: node.name,
      level: level,
    };
  }

我需要添加路由，比如当我点击度数时，我需要导航到另一个页面，我不确定在哪里放置路由器链接。是否有可能做到这一点？谢谢。

【问题讨论】：

标签： angular angular-routing angular-tree-component

【解决方案1】：

您可以将{{node.name}} 包装为<span>，例如：

<span click="navigateToPage(node.name)">{{node.name}}</span>

然后在您的 TS 代码中添加 private router: Router 给你的构造函数并添加一个类似这样的方法：

constructor(
  private breakpointObserver: BreakpointObserver,
  private router: Router
) {
    this.dataSource.data = PROFILE_DATA;
}

navigateToPage(name: string) {
  if (name === 'Degrees') {
    this.router.navigate([<THE_ROUTE_YOU_WISH_TO_NAVIGATE_TO>]);
  }
}

【讨论】：

谢谢，我会试试你的解决方案。我的解决方案是，我忘记在私有转换器和 HTML routerLink="{{node.url}}" 中添加 url: node.url。在下面添加了完整的工作代码。

【解决方案2】：

我的工作解决方案：

HTML：

<mat-tree   [dataSource]="dataSource" class="tree-container" [treeControl]="treeControl">
        <!-- This is the tree node template for leaf nodes -->
        <mat-tree-node class="btnLinks" routerLink="{{node.url}}" routerLinkActive="active" *matTreeNodeDef="let node" matTreeNodePadding>
          <!-- use a disabled button to provide padding for tree leaf -->
          <button mat-icon-button disabled></button>
          {{node.name}}

        </mat-tree-node>
        <!-- This is the tree node template for expandable nodes -->
        <mat-tree-node class="btnLinks" routerLink="{{node.url}}" routerLinkActive="active" *matTreeNodeDef="let node;when: hasChild" matTreeNodePadding>
          <button mat-icon-button matTreeNodeToggle
                  [attr.aria-label]="'toggle ' + node.name">
            <mat-icon class="mat-icon-rtl-mirror">
              {{treeControl.isExpanded(node) ? 'expand_more' : 'chevron_right'}}
            </mat-icon>
          </button>
          {{node.name}}
        </mat-tree-node>
      </mat-tree>

.ts

interface TreeFlatNode {
  expandable: boolean;
  name: string;
  level: number;
}

/**
 * @title Tree with flat nodes
 */
@Component({
  selector: 'mpn-profile-landing',
  templateUrl: './profile-landing.component.html',
  styleUrls: ['./profile-landing.component.css']
})

export class ProfileLandingComponent {

  constructor(private breakpointObserver: BreakpointObserver) {
    this.dataSource.data = PROFILE_DATA;
  }


  private transformer = (node: ProfileList, level: number) => {
    return {
      expandable: !!node.children && node.children.length > 0,
      name: node.name,
      level: level,
      url: node.url
    };
  }

  treeControl = new FlatTreeControl<TreeFlatNode>(
    node => node.level, node => node.expandable);

  treeFlattener = new MatTreeFlattener(
    this.transformer, node => node.level, node => node.expandable, node => node.children);

  dataSource = new MatTreeFlatDataSource(this.treeControl, this.treeFlattener);

  hasChild = (_: number, node: TreeFlatNode) => node.expandable;
}

【讨论】：