Tips for effectively transferring data between components in Angular 2

One of the challenges I'm facing is with my header component. It has a function that toggles a class on click, and it works perfectly within the header component. However, I now want to extend this functionality to my nav component in order to add classes based on this event.

The question at hand:

How can I access these variables inside the nav component?

The behavior I desire:

What I aim for is the ability to include CSS classes when the toggleMenu is clicked.

The code snippet:

Header Component:

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

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

export class HeaderComponent implements OnInit {

  private showOpened : boolean;

  constructor() {

  }

  ngOnInit() {
   this.showOpened = false;
  }


  toggleMenu() {
    this.showOpened = !this.showOpened;;
  }
}

Header HTML:

<div class="header-container">
  <header class="wrapper clearfix">
    <h1 class="logo">---</h1>
    <input type="checkbox" class="checkbox-menu" id="menu-toogle">
    <label for="menu-toogle" class="menu-toogle" (click)="toggleMenu()"></label>
    <div class="bar" [class.animate]="showOpened"></div>
    <span class="icon-search"></span>
  </header> 
</div>

Nav Component

import { Component, Input, OnInit } from '@angular/core';

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

export class NavComponent implements OnInit {
  constructor() { }

  ngOnInit() {
  }

}

Nav HTML

<nav [class.open-menu]="showOpened"></nav>

Answer №1

Give this code snippet a try: Header HTML

<div class="header-container">
  <header class="wrapper clearfix">
    <h1 class="logo">---</h1>
    <input type="checkbox" class="checkbox-menu" id="menu-toogle">
    <label for="menu-toogle" class="menu-toogle" (click)="toggleMenu()"></label>
    <div class="bar" [class.animate]="showOpened"></div>
    <span class="icon-search"></span>
  </header> 
  <app-nav [showOpened]="showOpened"></app-nav> <!-- place this code where you want to display your navigation -->
</div>

Nav Component

import { Component, Input, OnInit } from '@angular/core';

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

export class NavComponent implements OnInit {

  @Input() showOpened: boolean;
  constructor() { }

  ngOnInit() {
  }

}

Nav HTML

<nav [class.open-menu]="showOpened"></nav> <!-- Access the showOpened value from parent header here -->

For more information on components interaction in angular, check out the documentation at: https://angular.io/docs/ts/latest/cookbook/component-communication.html#!#parent-to-child

Answer №2

One effective approach is to establish component communication through a service, especially when dealing with independent or sibling components like side menus and headers.

To learn more about implementing this communication method in Angular 2, check out the following website: https://angular.io/docs/ts/latest/cookbook/component-communication.html

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