I need help with understanding data sharing between components... I have a project that has a cart page and a footer that is a standalone component and is included in every page of my app... In the footer I have a cart icon and on that icon I'm trying to show the number of items in cart... I get the data of items in cart from an API... Do I have to call this api and all of its data in the footer component with the same function as in the cart page also or is there a shorter simpler way that uses less code?
In the image bellow you can see this footer component (NOTE: 11 is hardcoded at the moment):
Here is the the API response how the cart data looks like:
{
"total_products": 0,
"totals": null,
"notes": null,
"shipping_method": null,
"products": []
}
Here is the code of cart.page.ts that I use to show data in my app:
ngOnInit() {
this.getCart();
}
getCart() {
this.getCartSubscription = this.cartService.getCart().subscribe(
(data: any) => {
const productsData = data.body.products;
const totalProducts = data.body.total_products;
const totalCartPrice = data.body.totals;
this.products = productsData.map(products => products);
this.totalProducts = totalProducts;
this.totalCartPrice = totalCartPrice;
console.log('Products in cart:', data.body);
},
error => {
console.log('Error', error);
});
}
How do I approach to showing total products in my footer component?
Is my code even good? Is there a way to optimize it? This is my first real Angular project and I would like to do this as propperly as possible :)
**EDIT: I have read about and tried using BehaviourSubject but am unsure of it implementation in my case...
Thank you very much :)
CodePudding user response：
Use BehaviorSubject. It is the simplest way in angular to share data between unrelated component.
CodePudding user response：
You could decorate the page-component with @Output and the footer with @Input. See this page on angular.io