单击 Angular 时显示/隐藏 <ul>

Question

我正在尝试在 HTML 上显示菜单。目前它显示所有子菜单选项。我想让它显示点击项目的选项。

下面是我的home.html代码

  <ul class="navbar-nav">
    <li data-toggle="dropdown" class="nav-item" *ngFor="let page of list;let i = index" id="id{{page.link_id}}"><span  (click)="showsubmenu(i)">{{page.link_name}}<i class="iconn" *ngIf="page.flg[0].SHOW_ICON=='YES'"><ion-icon name="md-arrow-dropdown"></ion-icon></i></span>

     <ul *ngFor="let sublink of page.sublink; let j=index;"><li >{{sublink.SUBLINK_NAME}}</li></ul>


    </li>
  </ul>

默认会出现子菜单选项，见下图：

home.ts 代码如下：

export class HomePage {

 list = [];submenu;
  json_data = [
    {"link_id":"38","link_name":"Contact","flg":[{"SHOW_ICON":"NO"}],"sublink":[]},
    {"link_id":"37","link_name":"Offices","flg":[{"SHOW_ICON":"YES"}],"sublink":[{"SUBLINK_NAME":"test11","SUBLINK_OF":"37","SUBLINK_ID":"10005"}]},
    {"link_id":"34","link_name":"Products","flg":[{"SHOW_ICON":"YES"}],"sublink":[{"SUBLINK_NAME":"Quick Patrol","SUBLINK_OF":"34","SUBLINK_ID":"10004"},{"SUBLINK_NAME":"Link2","SUBLINK_OF":"34","SUBLINK_ID":"10013"}]},
    {"link_id":"33","link_name":"Home","flg":[{"SHOW_ICON":"NO"}],"sublink":[]}
  ];

  constructor(public navCtrl: NavController) {
this.list = this.json_data;
  }


  showsubmenu(index){

    this.submenu= this.list[index]["link_id"];
    console.log(this.submenu);
    this.submenu=this.list[index]["sublink"];
    console.log(this.submenu.length);

  }
}

Answer 1

引入一个新的属性，它将保留打开的菜单索引。使用 ngIf 切换 show/hide 子菜单：

HTML:

//First li
<li (click)="show === i ? show =- 1: show = i" ....>

//second li
<li *ngIf="show === i">....

打字稿：

...
show = -1;
...

DEMO

Answer 2

<ng-container *ngIf="page.flg[0]=='NO'?null:true"><ul *ngFor="let sublink of page.sublink; let j=index;"><li >{{sublink.SUBLINK_NAME}}</li></ul></ng-container>

在*.ts中可以添加

showsubmenu(index) { this.list[index]['flg'][0] === 'NO'? 'YES' : 'NO'; }

如果将 'flg' 键保留为布尔值而不是字符串数组会更好。而不是 'showsubmenu()'，您可以像这样处理 html 中的 flg 键值：

(click)="page.flg?null:true"

单击 Angular 时显示/隐藏 <ul>

Show / hide <ul> on click in Angular

typescript

ionic-framework

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angular