disable some buttons in headline navbar

2 files changed, 33 insertions, 4 deletions

diff --git a/backend.php b/backend.php
index c9ca89053..f862d540d 100644
--- a/backend.php
+++ b/backend.php
@@ -162,6 +162,11 @@
 				OR content LIKE '%$search%') AND";
 		}
 
+		$result = pg_query("SELECT count(id) AS total_entries 
+			FROM ttrss_entries WHERE feed_id = '$feed'");
+
+		$total_entries = pg_fetch_result($result, 0, "total_entries");
+
 		$result = pg_query("SELECT 
 				id,title,updated,unread,feed_id,
 				EXTRACT(EPOCH FROM last_read) AS last_read_ts,
@@ -216,11 +221,21 @@
 		$prev_skip = $skip - HEADLINES_PER_PAGE;
 	
 		print "Navigate: ";
-		print "<a class=\"button\" 
-			href=\"javascript:viewfeed($feed, $prev_skip);\">Previous Page</a>";
+
+		if ($prev_skip >= 0) {
+			print "<a class=\"button\" 
+				href=\"javascript:viewfeed($feed, $prev_skip);\">Previous Page</a>";
+		} else {
+			print "<a class=\"disabledButton\">Previous Page</a>";
+		}
 		print "&nbsp;";
-		print "<a class=\"button\" 
-			href=\"javascript:viewfeed($feed, $next_skip);\">Next Page</a>";
+
+		if ($next_skip < $total_entries) {		
+			print "<a class=\"button\" 
+				href=\"javascript:viewfeed($feed, $next_skip);\">Next Page</a>";
+		} else {
+			print "<a class=\"disabledButton\">Next Page</a>";
+		}			
 		print "&nbsp;";
 		print "<a class=\"button\" 
 			href=\"javascript:viewfeed($feed, $skip, '');\">Refresh Page</a>";
diff --git a/tt-rss.css b/tt-rss.css
index 31fe9488c..0da8b1229 100644
--- a/tt-rss.css
+++ b/tt-rss.css
@@ -231,6 +231,20 @@ table.prefFeedList tr.title td {
 	background-color : #c0c0c0;
 }
 
+a.disabledButton {
+	border : 1px solid #d0d0d0;
+	background-color : white;
+	color : #909090;	
+	padding : 2px 10px 2px 10px;
+	font-size : small;
+}
+
+a.disabledButton:hover {
+	background : white;
+	text-decoration : none;
+	color : #909090;
+}
+
 a.button {
 	border : 1px solid #d0d0d0;
 	background-image : url("button.png");