Fix midterm alert empty index error

NKUST-ITC · Aug 28, 2020 · bd0e0b5 · bd0e0b5
1 parent 642c742
commit bd0e0b5
Showing 1 changed file with 22 additions and 21 deletions.
diff --git a/lib/api/parser/ap_parser.dart b/lib/api/parser/ap_parser.dart
@@ -304,29 +304,30 @@ Map<String, dynamic> midtermAlertsParser(String html) {
   Map<String, dynamic> data = {"courses": []};
 
   var document = parse(html);
-  var table =
-      document.getElementsByTagName("table")[1].getElementsByTagName("tr");
-  try {
-    for (int i = 1; i < table.length; i++) {
-      var tdData = table[i].getElementsByTagName("td");
-      if (tdData.length < 5) {
-        continue;
-      }
-      if (tdData[5].text[0] == "是") {
-        data["courses"].add({
-          "entry": tdData[0].text,
-          "className": tdData[1].text,
-          "title": tdData[2].text,
-          "group": tdData[3].text,
-          "instructors": tdData[4].text,
-          "reason": tdData[6].text,
-          "remark": tdData[7].text
-        });
+  var table = document.getElementsByTagName("table");
+  if (table.length > 1)
+    try {
+      final td = table[1].getElementsByTagName("tr");
+      for (int i = 1; i < td.length; i++) {
+        var tdData = td[i].getElementsByTagName("td");
+        if (tdData.length < 5) {
+          continue;
+        }
+        if (tdData[5].text[0] == "是") {
+          data["courses"].add({
+            "entry": tdData[0].text,
+            "className": tdData[1].text,
+            "title": tdData[2].text,
+            "group": tdData[3].text,
+            "instructors": tdData[4].text,
+            "reason": tdData[6].text,
+            "remark": tdData[7].text
+          });
+        }
       }
+    } on Exception catch (e) {
+      print(e);
     }
-  } on Exception catch (e) {
-    print(e);
-  }
   return data;
 }