Angular Pass Data to Route: Dynamic/Static
Angular is an open-source framework for building web applications and is known for its two-way data binding capabilities. Angular provides several ways to pass data from one component or page to another, and one of the most popular ways is by using route parameters.
In Angular, route parameters are used to pass data from one component to another. Data can be both dynamic and static, depending on the use case. Dynamic data is passed at runtime and can change with time, while static data is passed once and remains unchanged.
In this article, we’ll explore both dynamic and static data and how to pass them using Angular’s built-in route parameters.
Dynamic Data
Dynamic data is data that changes at runtime and needs to be passed from one component to another. In Angular, dynamic data can be passed using route parameters. For example, if we have a component that displays a list of products and a second component that displays the details of a product, we can pass the product ID from the list component to the details component using a route parameter.
Here’s an example of how it can be done:
1. Define a route for the details component in the routing module.
“`html
const routes: Routes = [
{ path: ‘products/:id’, component: ProductDetailComponent }
];
“`
2. Pass the product ID from the list component to the details component using routerLink.
“`html
{{ product.name }}
“`
3. Retrieve the product ID in the details component using the ActivatedRoute service.
“`html
import { Component, OnInit } from ‘@angular/core’;
import { ActivatedRoute } from ‘@angular/router’;
@Component({
selector: ‘app-detail’,
template: `
Product Details
{{ product.name }}
{{ product.description }}
`
})
export class ProductDetailComponent implements OnInit {
product: any;
constructor(private route: ActivatedRoute) {}
ngOnInit() {
this.route.paramMap.subscribe(params => {
const id = params.get(‘id’);
this.product = products.find(product => product.id === +id);
});
}
}
“`
In this example, we defined a route for the details component that includes a parameter called “id”. We then used routerLink to pass the product ID from the list component to the details component. Finally, in the details component, we retrieved the product ID using the ActivatedRoute service and used it to display the details of the product.
Static Data
Static data is data that remains unchanged and is passed only once. In Angular, static data can be passed using route data. For example, if we have a component that displays a contact us page, we can pass the contact information using route data.
Here’s an example of how it can be done:
1. Define a route for the contact component in the routing module and add route data.
“`html
const routes: Routes = [
{ path: ‘contact’, component: ContactComponent, data: { name: ‘John Doe’, email: ‘johndoe@example.com’ } }
];
“`
2. Retrieve the contact information in the contact component using the ActivatedRoute service.
“`html
import { Component, OnInit } from ‘@angular/core’;
import { ActivatedRoute } from ‘@angular/router’;
@Component({
selector: ‘app-contact’,
template: `
Contact Us
Name: {{ name }}
Email: {{ email }}
`
})
export class ContactComponent implements OnInit {
name: string;
email: string;
constructor(private route: ActivatedRoute) {}
ngOnInit() {
this.name = this.route.snapshot.data.name;
this.email = this.route.snapshot.data.email;
}
}
“`
In this example, we defined a route for the contact component that includes route data for the name and email. We then retrieved the contact information in the contact component using the ActivatedRoute service and used it to display the contact details.
FAQs
1. What are route parameters in Angular?
Route parameters are used to pass data from one component to another in Angular. They are added to the URL as a segment and can be retrieved using the ActivatedRoute service.
2. What is dynamic data in Angular?
Dynamic data is data that changes at runtime and needs to be passed from one component to another. It is typically passed using route parameters.
3. What is static data in Angular?
Static data is data that remains unchanged and is passed only once. It is typically passed using route data.
4. How do I pass data using route parameters in Angular?
To pass data using route parameters in Angular, add the route parameter to the URL as a segment and retrieve it using the ActivatedRoute service.
5. Can I pass multiple route parameters in Angular?
Yes, you can pass multiple route parameters in Angular by adding them to the URL as segments separated by a slash (/).
Conclusion
Angular provides several ways to pass data from one component to another, and route parameters are one of the most popular ways. Dynamic data can be passed using route parameters, while static data can be passed using route data. By using Angular’s built-in routing capabilities, developers can build web applications that are dynamic and responsive.