Add services

src/service/country.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class CountryService {
+
+    constructor(private http: HttpClient) { }
+
+    getCountries() {
+        return this.http.get<any>('assets/demo/data/countries.json')
+            .toPromise()
+            .then(res => res.data as any[])
+            .then(data => data);
+    }
+}

src/service/customer.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+export interface Country {
+    name?: string;
+    code?: string;
+}
+
+export interface Representative {
+    name?: string;
+    image?: string;
+}
+
+export interface Customer {
+    id?: number;
+    name?: string;
+    country?: Country;
+    company?: string;
+    date?: string;
+    status?: string;
+    activity?: number;
+    representative?: Representative;
+}
+
+@Injectable()
+export class CustomerService {
+
+    constructor(private http: HttpClient) { }
+
+    getCustomersSmall() {
+        return this.http.get<any>('assets/demo/data/customers-small.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+
+    getCustomersMedium() {
+        return this.http.get<any>('assets/demo/data/customers-medium.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+
+    getCustomersLarge() {
+        return this.http.get<any>('assets/demo/data/customers-large.json')
+            .toPromise()
+            .then(res => res.data as Customer[])
+            .then(data => data);
+    }
+}

src/service/event.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class EventService {
+
+    constructor(private http: HttpClient) { }
+
+    getEvents() {
+        return this.http.get<any>('assets/demo/data/scheduleevents.json')
+            .toPromise()
+            .then(res => res.data as any[])
+            .then(data => data);
+    }
+}

src/service/icon.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { map } from 'rxjs/operators';
+
+@Injectable()
+export class IconService {
+
+    constructor(private http: HttpClient) { }
+
+    icons!: any[];
+
+    selectedIcon: any;
+
+    apiUrl = 'assets/demo/data/icons.json';
+
+    getIcons() {
+        return this.http.get(this.apiUrl).pipe(map((response: any) => {
+            this.icons = response.icons;
+            return this.icons;
+        }));
+    }
+}

src/service/node.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { TreeNode } from 'primeng/api';
+
+@Injectable()
+export class NodeService {
+
+    constructor(private http: HttpClient) { }
+
+    getFiles() {
+        return this.http.get<any>('assets/demo/data/files.json')
+            .toPromise()
+            .then(res => res.data as TreeNode[]);
+    }
+
+    getLazyFiles() {
+        return this.http.get<any>('assets/demo/data/files-lazy.json')
+            .toPromise()
+            .then(res => res.data as TreeNode[]);
+    }
+
+    getFilesystem() {
+        return this.http.get<any>('assets/demo/data/filesystem.json')
+            .toPromise()
+            .then(res => res.data as TreeNode[]);
+    }
+
+    getLazyFilesystem() {
+        return this.http.get<any>('assets/demo/data/filesystem-lazy.json')
+            .toPromise()
+            .then(res => res.data as TreeNode[]);
+    }
+}

src/service/photo.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+export interface Image {
+    previewImageSrc?:any;
+    thumbnailImageSrc?:any;
+    alt?:any;
+    title?:any;
+}
+
+@Injectable()
+export class PhotoService {
+
+    constructor(private http: HttpClient) { }
+
+    getImages() {
+        return this.http.get<any>('assets/demo/data/photos.json')
+            .toPromise()
+            .then(res => res.data as Image[])
+            .then(data => data);
+    }
+}

src/service/product.service.ts

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+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+interface InventoryStatus {
+    label: string;
+    value: string;
+}
+
+export interface Product {
+    id?: string;
+    code?: string;
+    name?: string;
+    description?: string;
+    price?: number;
+    quantity?: number;
+    inventoryStatus?: InventoryStatus;
+    category?: string;
+    image?: string;
+    rating?: number;
+}
+
+@Injectable()
+export class ProductService {
+
+    constructor(private http: HttpClient) { }
+
+    getProductsSmall() {
+        return this.http.get<any>('assets/demo/data/products-small.json')
+            .toPromise()
+            .then(res => res.data as Product[])
+            .then(data => data);
+    }
+
+    getProducts() {
+        return this.http.get<any>('assets/demo/data/products.json')
+            .toPromise()
+            .then(res => res.data as Product[])
+            .then(data => data);
+    }
+
+    getProductsMixed() {
+        return this.http.get<any>('assets/demo/data/products-mixed.json')
+            .toPromise()
+            .then(res => res.data as Product[])
+            .then(data => data);
+    }
+
+    getProductsWithOrdersSmall() {
+        return this.http.get<any>('assets/demo/data/products-orders-small.json')
+            .toPromise()
+            .then(res => res.data as Product[])
+            .then(data => data);
+    }
+}