Tuesday, November 21, 2017

Angular simple sort.

Here I will be discussing about doing a simple sort using Angular and JavaScript. Let us create a simple table with an option to select sortable fields.

Component code


import { Component} from '@angular/core';

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

export class AppComponent {
  item : any[];
  keys : any[];
  
  constructor(){
    this.item = [
        {firstName :'Prashobh',lastName : 'PS',age:28},
        {firstName :'Abraham',lastName : 'A',age:38},
        {firstName :'Zian',lastName : 'Z',age:16},
        {firstName :'Catherin',lastName : 'CZ',age:24},
      ]
     this.keys = Object.keys(this.item[0]); 
  }
}

Html


<select class="selectClass" [(ngModel)]="selected" (change)="onChange($event.target.value)">
 <option [ngValue]="no-value" disabled selected>Select</option>
 <option *ngFor="let k of keys">{{k}}</option>
</select>


<table class="table">
 <thead>
   <tr>
 <th scope="col">First Name</th>
 <th scope="col">Last Name</th>
 <th scope="col">Age</th>
   </tr>
  </thead>
  <tbody>
  <tr *ngFor="let l of item">
 <td>{{l.firstName}}</td>
 <td>{{l.lastName}}</td>
 <td>{{l.age}}</td>
  </tr>
 </tbody>
</table>



We have created a simple table along with a select box to select sortable fields. And below is our simple sort method.


onChange(value: string) {
 this.item.sort(function (a, b) {
  if (a[value] < b[value]) {
 return -1;
  }
  if (a[value] > b[value]) {
 return 1;
  }
  return 0;
 });
}

We are done. Select the field in select box to sort the table.

Here we have discussed about implementing a simple sort using Angular and JavaScript.

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