5 Angular-管道（自定义）

1 代码结构

 2 myc02.component.ts

 1 import { Component, OnInit } from '@angular/core';
 2 
 3 @Component({
 4   selector: 'app-myc02',
 5   templateUrl: './myc02.component.html',
 6   styleUrls: ['./myc02.component.css']
 7 })
 8 export class Myc02Component implements OnInit {
 9 
10   emps = [
11     { name: '刘备', age: 37, sex: 1 },
12     { name: '孙尚香', age: 18, sex: 0 },
13     { name: '吕布', age: 31, sex: 1 },
14     { name: '貂蝉', age: 19, sex: 0 },
15   ];
16   constructor() { }
17 
18   ngOnInit(): void {
19   }
20 
21 }

3 gender.pipe.ts

 1 import { Pipe, PipeTransform } from '@angular/core';
 2 
 3 @Pipe({
 4   name: 'gender'
 5 })
 6 export class GenderPipe implements PipeTransform {
 7   // {{item.sex|gender:'xxx'}}
 8   //固定的管道写法{{value|管道名}}
 9   // value就会固定的传递到下方transform方法的参数1中，
10   transform(value: any, lang = 'zh') {
11     console.log(value);
12     if (lang == 'en') {
13       if (value == 0) return 'Female';
14       else return 'Male';
15     } else {
16       if (value == 0) return '女';
17       else return '男';
18     }
19   }
20 }

4 myc02.component.html

 1 <p>myc02 works!p>
 2 
 3 
 4 <table border="1">
 5     <tr>
 6         <td>序号td>
 7         <td>姓名td>
 8         <td>年龄td>
 9         <td>性别td>
10         <td>性别(EN)td>
11     tr>
12     <tr *ngFor="let item of emps; let i=index">
13         <td>{{i+1}}td>
14         <td>{{item.name}}td>
15         <td>{{item.age}}td>
16         
19         <td>{{item.sex|gender}}td>
20         <td>{{item.sex|gender:"en"}}td>
21     tr>
22 table>

5 效果图