I make a list of item in angular 2 .I want to sort that list using custom fliter or using pipe .can we sort my list with lastname .I tried like this
<ul *ngFor="let user of userList | lastname" class="userlist">
<li>
<span>{{user.name}}</span>
<span>{{user.lastname}}</span>
<span>{{user.age}}</span>
</li>
</ul>
but it gives me error so reverted please suggest a way to sort that https://stackblitz.com/edit/angular-fdxser?file=src%2Fapp%2Fapp.component.html
Here is how the Pipe should look (from your link)
lastname.pipe.ts:
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
name: 'lastname'
})
export class LastnamePipe implements PipeTransform {
transform(values: any[]): any[] {
return values.sort((a, b) => a.lastname.localeCompare(b.lastname));
}
}
if you want it the other way arround add a .reverse(); to the return statements or do b.lastname.localeCompare(a.lastname)
Add following sort pipe in your project. The following pipe is generic, you can change the attribute to sort as well ex. sort.pipe.ts
import {Pipe, PipeTransform} from '@angular/core';
@Pipe({name: "sortBy"})
export class SortPipe implements PipeTransform {
transform(array: Array<any>, args: any): Array<any> {
console.log("arra", array, '-- args:', args);
if (array !== undefined) {
let keys, order;
if(typeof args == 'string'){ // use default sort criteria
keys = [args];
order = 1;
}
if(keys.length > 0){
array.sort((a: any, b: any) => {
if (a[keys[0]] < b[keys[0]]) {
return -1 * order;
} else if (a[keys[0]] > b[keys[0]]) {
return 1 * order;
} else {
return 0;
}
});
}
}
return array;
}
}
Declare s rot pipe in pipeModule like: pipes.module.ts
import {NgModule} from '@angular/core';
import {SortPipe} from './sort.pipe';
@NgModule({
imports: [],
declarations: [SortPipe],
exports: [SortPipe],
})
export class PipesModule {
static forRoot() {
return {
ngModule: PipesModule,
providers: [],
};
}
}
Inject PipeModule in app.module.ts. And HTML will be:
<ul *ngFor="let user of userList | sortBy :'lastname'" class="userlist">
You would need to write a custom pipe for that.
Check out this answer from Cory Shaw - angular-2-sort-and-filter
