`How can default query parameters be configured for Routes in Angular 7?`

Question

`How can default query parameters be configured for Routes in Angular 7?`

Within our Angular-7-Application, we rely on @ngrx and @ngrx/router-store to incorporate query params into the state.

Many parts of the application consist of paginated lists. Each list is represented as a component with the Pagination-Component integrated alongside.

The current page number is stored in the URL through the query parameter: user/:userId/agent?page=0 with the PaginationComponent fetching the current page from

state.router.state.queryParams.page

. However, if a user accesses the URL user/:userId/agent, queryParams.page will return undefined.

We could resolve this issue by utilizing

state.router.state.queryParams.page || 0

in each component, but I am curious if there is a simpler solution - can a Route lacking query params be redirected to a Route with query params?

I attempted the most straightforward redirect method:

{ path: 'user/:userId/agent', redirectTo: '/user/:userId/agent?page=0', pathMatch: 'full' },
{ path: 'user/:userId/agent?page=0', component: AgentListComponent },

yet encountered an error:

Error: Cannot match any routes. URL Segment: 'user/max/agent'

.

The only related feature request I came across was mentioned in this report, where the same error was highlighted.

angular typescript ngrx angular-routing ngrx-router-store

Answer 1

Answer №1

Regarding your specific query:

Is it possible to redirect a Route without query parameters to a Route with query parameters?

I believe this may not be feasible because the '?' in a query serves as a separator and is not part of a URL's query string.

Potential Solution 1 - If you are utilizing ngrx, one approach could be to employ a custom serializer. The documentation on ngrx.io provides an illustration of how to return the parameters with serialization. This method allows you to incorporate logic to include a default value for parameters that are missing. It should be noted that this may not be the most optimal solution as it triggers for each route but can simplify your routes.

import { Params, RouterStateSnapshot } from '@angular/router';
import { RouterStateSerializer } from '@ngrx/router-store';

export interface RouterStateUrl {
  url: string;
  params: Params;
  queryParams: Params;
}

export class CustomSerializer implements RouterStateSerializer<RouterStateUrl> {
  serialize(routerState: RouterStateSnapshot): RouterStateUrl {
    let route = routerState.root;

    while (route.firstChild) {
      route = route.firstChild;
    }

    const {
      url,
      root: { queryParams },
    } = routerState;
    const { params } = route;

    // Add here
    if (<insert url logic> && queryParams.page === undefined) {
        queryParams.page = 0;
    }

    // Return an object containing the URL, params, and query params instead of the entire snapshot
    return { url, params, queryParams };
  }
}

Potential Solution 2 - You might consider wrapping the HttpClient or creating a generic page list method that verifies this condition and adds it to the request if there is no page specified. An example demonstrating how to add parameters can be found in this answer.

Potential Solution 3 - Alternatively, you can integrate the page number into the path and make necessary adjustments to formulate your requests.

{ path: 'user/:userId/agent', redirectTo: '/user/:userId/agent/0', pathMatch: 'full' },
{ path: 'user/:userId/agent/:page', component: AgentListComponent },

Answer 2

Regarding your specific query:

Is it possible to redirect a Route without query parameters to a Route with query parameters?

I believe this may not be feasible because the '?' in a query serves as a separator and is not part of a URL's query string.

Potential Solution 1 - If you are utilizing ngrx, one approach could be to employ a custom serializer. The documentation on ngrx.io provides an illustration of how to return the parameters with serialization. This method allows you to incorporate logic to include a default value for parameters that are missing. It should be noted that this may not be the most optimal solution as it triggers for each route but can simplify your routes.

import { Params, RouterStateSnapshot } from '@angular/router';
import { RouterStateSerializer } from '@ngrx/router-store';

export interface RouterStateUrl {
  url: string;
  params: Params;
  queryParams: Params;
}

export class CustomSerializer implements RouterStateSerializer<RouterStateUrl> {
  serialize(routerState: RouterStateSnapshot): RouterStateUrl {
    let route = routerState.root;

    while (route.firstChild) {
      route = route.firstChild;
    }

    const {
      url,
      root: { queryParams },
    } = routerState;
    const { params } = route;

    // Add here
    if (<insert url logic> && queryParams.page === undefined) {
        queryParams.page = 0;
    }

    // Return an object containing the URL, params, and query params instead of the entire snapshot
    return { url, params, queryParams };
  }
}

Potential Solution 2 - You might consider wrapping the HttpClient or creating a generic page list method that verifies this condition and adds it to the request if there is no page specified. An example demonstrating how to add parameters can be found in this answer.

Potential Solution 3 - Alternatively, you can integrate the page number into the path and make necessary adjustments to formulate your requests.

{ path: 'user/:userId/agent', redirectTo: '/user/:userId/agent/0', pathMatch: 'full' },
{ path: 'user/:userId/agent/:page', component: AgentListComponent },

Answer 3

Answer №2

We incorporate @ngrx and @ngrx/router-store in our Angular-7-Application to seamlessly integrate query params with the state.

In order to maintain synchronization between query params and state, it is important to have an effect that captures any action leading to a page change within the application. This event should include code similar to:

@Effect({dispatch:false})
setRouteParams = this.actions$.pipe(
    ofType<ActionCausingPageChange>("action name"),
    tap( action =>{

        let a = { page: action.payload.page };
        // Alternatively, if the page information is not accessible from the action payload, retrieve it from the store
        this.router.navigate(
            [], {
                relativeTo: this.route,
                queryParamsHandling: 'merge',
                queryParams: a
            });
        }
    )
);

Furthermore, implementing a meta reducer can update the state based on query params upon page reload:

export function initStateFromQueryParams(
    reducer: ActionReducer<AppState>
): ActionReducer<AppState> {
    return function(state, action) {
        const newState = reducer(state, action);
        if ([INIT.toString(), UPDATE.toString()].includes(action.type)) {
            const urlParams = new URLSearchParams(window.location.search);
            return { ...newState, page: urlParams.get("page") };
        }
        return newState;
    };
}

This approach ensures that any changes in page number are accurately reflected in the URL. Therefore, even when navigating to a new route or component, the effect will automatically update the query params once the initial data for that route is loaded.

If you are interested in exploring more about state management in Angular applications, consider reading this insightful article

Answer 4

We incorporate @ngrx and @ngrx/router-store in our Angular-7-Application to seamlessly integrate query params with the state.

In order to maintain synchronization between query params and state, it is important to have an effect that captures any action leading to a page change within the application. This event should include code similar to:

@Effect({dispatch:false})
setRouteParams = this.actions$.pipe(
    ofType<ActionCausingPageChange>("action name"),
    tap( action =>{

        let a = { page: action.payload.page };
        // Alternatively, if the page information is not accessible from the action payload, retrieve it from the store
        this.router.navigate(
            [], {
                relativeTo: this.route,
                queryParamsHandling: 'merge',
                queryParams: a
            });
        }
    )
);

Furthermore, implementing a meta reducer can update the state based on query params upon page reload:

export function initStateFromQueryParams(
    reducer: ActionReducer<AppState>
): ActionReducer<AppState> {
    return function(state, action) {
        const newState = reducer(state, action);
        if ([INIT.toString(), UPDATE.toString()].includes(action.type)) {
            const urlParams = new URLSearchParams(window.location.search);
            return { ...newState, page: urlParams.get("page") };
        }
        return newState;
    };
}

This approach ensures that any changes in page number are accurately reflected in the URL. Therefore, even when navigating to a new route or component, the effect will automatically update the query params once the initial data for that route is loaded.

If you are interested in exploring more about state management in Angular applications, consider reading this insightful article

Answer 5

Answer №3

In my experience, implementing this solution on the main route was successful:

{
  path: '',
  redirectTo: '/foo?bar=baz',
  pathMatch: 'full'
}

But when attempting to do the same with a parameter that has a name (such as your :userId), it did not yield the desired outcome.

Answer 6

In my experience, implementing this solution on the main route was successful:

{
  path: '',
  redirectTo: '/foo?bar=baz',
  pathMatch: 'full'
}

But when attempting to do the same with a parameter that has a name (such as your :userId), it did not yield the desired outcome.

Answer 7

Answer №4

To implement this feature, I have set up a route in the routing module that directs to a specific component:

{
    path: 'redirect-to-this-component',
    component: RedirectComponent
}

Within the RedirectComponent, you can use navigate with query parameters to return to the desired route:

// RedirectComponent

ngOnInit(): void {
    this.router.navigate(['/desired-route'], { queryParams: { param: 'value' } });
}

Answer 8

To implement this feature, I have set up a route in the routing module that directs to a specific component:

{
    path: 'redirect-to-this-component',
    component: RedirectComponent
}

Within the RedirectComponent, you can use navigate with query parameters to return to the desired route:

// RedirectComponent

ngOnInit(): void {
    this.router.navigate(['/desired-route'], { queryParams: { param: 'value' } });
}

`How can default query parameters be configured for Routes in Angular 7?`

Answer №1

Answer №2

Answer №3

Answer №4

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