add IDs and classes to crypto link list, add JS to prevent default clicking behavior

app.js

@@ -47,3 +47,44 @@ document.getElementById("dogewall").addEventListener("click", function(){
         // Display alert to confirm the address was added to clipboard
         alert("DOGE address copied to clipboard");
 });
+
+//
+// Display crypto QR code when link is clicked
+//
+// Prevent clicks on QR codes from functioning
+document.querySelector("#btc-qr-link a").addEventListener("click", function(event){
+  event.preventDefault()
+});
+document.querySelector("#eth-qr-link a").addEventListener("click", function(event){
+  event.preventDefault()
+});
+document.querySelector("#doge-qr-link a").addEventListener("click", function(event){
+  event.preventDefault()
+});
+
+// Watch for click on BTC QR code link
+document.querySelector("#btc-qr-link a").addEventListener("click", function(){
+	console.log('BTC QR Clicked');
+        // Hide all other QR codes
+        
+        // Display BTC QR code
+        
+});
+
+// Watch for click on ETH QR code link
+document.querySelector("#eth-qr-link a").addEventListener("click", function(){
+	console.log('ETH QR Clicked');
+        // Hide all other QR codes
+        
+        // Display ETH QR code
+        
+});
+
+// Watch for click on DOGE QR code link
+document.querySelector("#doge-qr-link a").addEventListener("click", function(){
+	console.log('DOGE QR Clicked');
+        // Hide all other QR codes
+        
+        // Display DOGE QR code
+        
+});