First this not duplicated take time to read, because there is lot of similar question but they are in the @Component decorator
I got the idea to catch screen resizing in a service then sharing some css value by an observable, but it seem that my service is not working (not able to catch screen resize event).
Here is my code
import { Injectable, HostListener } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Injectable({
providedIn: 'root',
})
export class BreakPointService {
normal: {
background: 'w3-teal',
inputColor: 'w3-light-grey',
css_parent: 'w3-container w3-teal'
};
breakpoint: {
background: 'w3-dark-blue',
inputColor: 'w3-white',
css_parent: 'w3-container w3-light-grey'
};
breakPointValue: number;
css_behaviour = new BehaviorSubject(JSON.stringify(this.breakpoint));
current_css = this.css_behaviour.asObservable();
@HostListener('window:resize', ['$event'])
onResize(event) {
console.log();
this.breakPointValue = window.innerWidth;
console.log(this.breakPointValue);
if (this.breakPointValue > 768) {
console.log(JSON.stringify(this.normal));
this.css_behaviour.next(JSON.stringify(this.normal));
} else {
console.log(JSON.stringify(this.breakpoint));
this.css_behaviour.next(JSON.stringify(this.breakpoint));
}
}
public css() {
if (this.breakPointValue > 768) {
return this.normal;
}
return this.breakpoint;
}
constructor() { }
}
Is there any way to do this or this is incheavable from a service ?
So I did not see in your OP where you are initializing the service. I had to do this almost exact thing in one app. We watch for screen size changes which triggers changes in some user preferences in local storage:
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { TableViewTypes, MediaSizes, UserPreferencesDefaults, TableView, getTableViewDefaults } from '../models/user-preferences.model';
import { StorageService } from './storage.service';
@Injectable()
export class UserPreferencesService {
private tableViewSubject = new BehaviorSubject<TableView>(UserPreferencesDefaults.tableView);
tableView$ = this.tableViewSubject.asObservable();
constructor(
private storageService: StorageService
) {}
init() {
this.tableViewSubject.next(
!(window.outerWidth > MediaSizes.sm) ?
getTableViewDefaults(false) :
UserPreferencesDefaults.tableView
);
window.addEventListener('resize', () => {
this.tableViewSubject.next(
!(window.outerWidth > MediaSizes.sm) ?
getTableViewDefaults(false) :
this.storageService.userPreferences.tableView
);
});
}
storeTableView(tableType: TableViewTypes, value: boolean) {
this.storageService.userPreferences = {
...this.storageService.userPreferences,
tableView: {
...this.storageService.userPreferences.tableView,
[tableType]: value
}
};
}
toggleTableView(tableType: TableViewTypes, value?: boolean) {
value = value !== undefined && value !== null ? value : !this.storageService.userPreferences.tableView[tableType];
this.tableViewSubject.next({
...this.storageService.userPreferences.tableView,
[tableType]: value
});
this.storeTableView(tableType, value);
}
}
Then in order for the service to work it is initialized by injecting it into the app.component.ts in the constructor param
constructor(
private userPreferenceService: UserPreferencesService,
) {this.userPreferenceService.init();}