Validates ticker

app.py

@@ -175,7 +175,18 @@ def check_symbol(symbol: str):
 
     exists = any(r["symbol"].upper() == symbol for r in ds)
 
+    if not exists:
+        logger.warning(f"Symbol not found: {symbol}")
+        return {
+            "symbol": symbol,
+            "exists": False,
+            "message": f"Symbol '{symbol}' does not exist in the dataset."
+        }
+
+    logger.info(f"Symbol exists: {symbol}")
     return {
         "symbol": symbol,
-        "exists": exists
+        "exists": True,
+        "message": f"Symbol '{symbol}' exists in the dataset."
     }
+

index.html

@@ -23,22 +23,29 @@ async function checkTicker() {
     const ticker = document.getElementById("tickerInput").value.trim().toUpperCase();
     const resultDiv = document.getElementById("result");
 
+    resultDiv.innerHTML = ""; // clear previous result
+
     if (!ticker) {
-        resultDiv.innerHTML = "Please enter a ticker.";
+        resultDiv.innerHTML = `<span style="color: red;">Please enter a ticker.</span>`;
         return;
     }
 
-    const response = await fetch(`/check/${ticker}`);
-    const data = await response.json();
+    try {
+        const response = await fetch(`/check/${ticker}`);
+        const data = await response.json();
+
+        if (data.exists) {
+            resultDiv.innerHTML = `<span style="color: green;">✔ ${data.message}</span>`;
+        } else {
+            resultDiv.innerHTML = `<span style="color: red;">✘ ${data.message}</span>`;
+        }
 
-    if (data.exists) {
-        resultDiv.innerHTML = `<span style="color: green;">✔ ${ticker} exists in the dataset</span>`;
-    } else {
-        resultDiv.innerHTML = `<span style="color: red;">✘ ${ticker} does NOT exist in the dataset</span>`;
+    } catch (err) {
+        resultDiv.innerHTML = `<span style="color: red;">Error connecting to server.</span>`;
+        console.error("Network error:", err);
     }
 }
 </script>
 
 </body>
 </html>
-