feat(service): Add feature for disable service

Author: kolkov

projects/ngx-metrika-app/src/app/app.component.ts

@@ -7,9 +7,10 @@ import {NgxMetrikaService} from '@kolkov/ngx-metrika';
   styleUrls: ['./app.component.scss']
 })
 export class AppComponent {
-  name = 'Angular 6 Yandex Metrika';
+  name = 'Angular 6+ Yandex Metrika';
 
   constructor(private ym: NgxMetrikaService) {
     ym.debug = true;
+    ym.disable();
   }
 }

projects/ngx-metrika/README.md

@@ -56,6 +56,15 @@ this.ym.hit.emit({url: '/custom',{
 }});
 ```
 
+## Disable service
+If we need to disable service for some reason, such as logged in into private area, we can disable it:
+```ts
+this.ym.disable();
+```
+If we need to re-enable service (when logoff from private area), then we can enable it:
+```ts
+this.ym.enable();
+```
 ## ReachGoal
 
 [ReachGoal](https://yandex.ru/support/metrika/objects/reachgoal.html) expect an action. 

projects/ngx-metrika/src/lib/ngx-metrika.service.ts

@@ -21,6 +21,8 @@ export class NgxMetrikaService {
   config: NgxMetrikaConfig;
   debug = false;
   previousUrl: string;
+
+  private disabled: boolean;
   private renderer: Renderer2;
 
   public hit = new EventEmitter<MetrikaHitEventOptions>();
@@ -73,7 +75,28 @@ export class NgxMetrikaService {
     }
   }
 
+  disable() {
+    this.disabled = true;
+  }
+
+  enable() {
+    this.disabled = false;
+  }
+
+  checkCounter(id: string | number): Promise<any> {
+    const that = this;
+    return new Promise((resolve) => {
+      const counterName = `yacounter${id}inited`;
+      that.renderer.listen('document', counterName, () => {
+        resolve({});
+      });
+    });
+  }
+
   private onHit(url: string, options?: MetrikaHitOptions) {
+    if (this.disabled) {
+      return;
+    }
     try {
       const defaults = {
         referer: this.previousUrl
@@ -134,14 +157,4 @@ export class NgxMetrikaService {
     }
     return name;
   }
-
-  checkCounter(id: string | number): Promise<any> {
-    const that = this;
-    return new Promise((resolve) => {
-      const counterName = `yacounter${id}inited`;
-      that.renderer.listen('document', counterName, () => {
-        resolve({});
-      });
-    });
-  }
 }