Fix: Add change detection and prevent duplicate event listeners

src/app/map-svg/map-svg.ts

@@ -8,6 +8,7 @@ import { Component, Output, EventEmitter, AfterViewInit, ElementRef } from '@ang
 })
 export class MapSvgComponent implements AfterViewInit {
   @Output() countryClick = new EventEmitter<string>();
+  private handlersAttached = false;
 
   constructor(private elementRef: ElementRef) {}
 
@@ -16,7 +17,9 @@ export class MapSvgComponent implements AfterViewInit {
     
     if (objectElement) {
       objectElement.addEventListener('load', () => {
+        if (!this.handlersAttached) {
           this.attachClickHandlers();
+        }
       });
     }
   }
@@ -39,10 +42,12 @@ export class MapSvgComponent implements AfterViewInit {
         path.setAttribute('class', 'country-path');
         path.setAttribute('style', 'cursor: pointer;');
         
-        path.addEventListener('click', () => {
+        const clickHandler = () => {
           console.log(`Clicked country: ${countryCode}`);
           this.countryClick.emit(countryCode.toUpperCase());
-        });
+        };
+        
+        path.addEventListener('click', clickHandler, { once: false });
         
         path.addEventListener('mouseenter', () => {
           (path as SVGPathElement).style.fill = '#3498db';
@@ -55,5 +60,8 @@ export class MapSvgComponent implements AfterViewInit {
         });
       }
     });
+    
+    this.handlersAttached = true;
+    console.log('Click handlers attached successfully');
   }
 }

src/app/map/map.ts

@@ -1,4 +1,4 @@
-import { Component } from '@angular/core';
+import { Component, ChangeDetectorRef } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { WorldBankService, CountryData } from '../services/world-bank';
 import { MapSvgComponent } from '../map-svg/map-svg';
@@ -14,24 +14,33 @@ export class MapComponent {
   loading: boolean = false;
   error: string | null = null;
 
-  constructor(private worldBankService: WorldBankService) {}
+  constructor(
+    private worldBankService: WorldBankService,
+    private cdr: ChangeDetectorRef
+  ) {}
 
   onCountrySelected(countryCode: string): void {
     console.log('Country selected:', countryCode);
+    console.log('Current state - loading:', this.loading, 'countryData:', this.countryData);
+    
     this.loading = true;
     this.error = null;
     this.countryData = null;
+    this.cdr.detectChanges();
     
     this.worldBankService.getCountryData(countryCode).subscribe({
       next: (data) => {
         console.log('Received data:', data);
         this.countryData = data;
         this.loading = false;
+        console.log('Updated state - loading:', this.loading, 'countryData:', this.countryData);
+        this.cdr.detectChanges();
       },
       error: (err) => {
         console.error('API Error:', err);
         this.error = 'Failed to load country data';
         this.loading = false;
+        this.cdr.detectChanges();
       }
     });
   }