How to iterate using ngFor loop Map containing key as string and values as map iteration
For Angular 6.1+ , you can use default pipe keyvalue
( Do review and upvote also ) :
<ul> <li *ngFor="let recipient of map | keyvalue"> {{recipient.key}} --> {{recipient.value}} </li></ul>
For the previous version :
One simple solution to this is convert map to array : Array.from
Component Side :
map = new Map<String, String>();constructor(){ this.map.set("sss","sss"); this.map.set("aaa","sss"); this.map.set("sass","sss"); this.map.set("xxx","sss"); this.map.set("ss","sss"); this.map.forEach((value: string, key: string) => { console.log(key, value); });}getKeys(map){ return Array.from(map.keys());}
Template Side :
<ul> <li *ngFor="let recipient of getKeys(map)"> {{recipient}} </li></ul>
If you are using Angular 6.1 or later, the most convenient way is to use KeyValuePipe
@Component({ selector: 'keyvalue-pipe', template: `<span> <p>Object</p> <div *ngFor="let item of object | keyvalue"> {{item.key}}:{{item.value}} </div> <p>Map</p> <div *ngFor="let item of map | keyvalue"> {{item.key}}:{{item.value}} </div> </span>` }) export class KeyValuePipeComponent { object: Record<number, string> = {2: 'foo', 1: 'bar'}; map = new Map([[2, 'foo'], [1, 'bar']]); }
Edit
For angular 6.1 and newer, use the KeyValuePipe as suggested by Londeren.
For angular 6.0 and older
To make things easier, you can create a pipe.
import {Pipe, PipeTransform} from '@angular/core';@Pipe({name: 'getValues'})export class GetValuesPipe implements PipeTransform { transform(map: Map<any, any>): any[] { let ret = []; map.forEach((val, key) => { ret.push({ key: key, val: val }); }); return ret; }} <li *ngFor="let recipient of map |getValues">
As it it pure, it will not be triggered on every change detection, but only if the reference to the map
variable changes