disable some submit-type buttons when required data is not given

1 files changed, 3 insertions, 0 deletions

diff --git a/prefs.js b/prefs.js
index 2539c3b62..8622526dd 100644
--- a/prefs.js
+++ b/prefs.js
@@ -282,6 +282,9 @@ function addFeed() {
 
 	if (link.value.length == 0) {
 		alert("Error: No feed URL given.");
+	} else if (link.value.match("http://") == null && 
+			link.value.match("https://") == null) {
+		alert("Error: Invalid feed URL.");
 	} else {
 		notify("Adding feed...");