Added scrollback option to webchat.

New configuration option "scrollback". false or 0 to disable, any
numeric >0 value to enable/set the maximum scrollback length.

Doesn't show chat messages prior to the user loading the map page,
but at least it allows users to scroll back and view messages they
may have missed while not paying full attention ot the map.

src/main/resources/configuration.txt

@@ -63,6 +63,7 @@ components:
     type: chatbox
     showplayerfaces: true
     messagettl: 5
+    scrollback: 100
   - class: org.dynmap.ClientComponent
     type: playermarkers
     showplayerfaces: true

web/css/dynmap_style.css

@@ -717,6 +717,15 @@
 	padding: 1px;
 }
 
+.scrollback {
+    max-height:6em !important;
+}
+
+.scrollback:hover {
+	overflow-y: auto !important;
+}
+
+
 .messagerow {
 	position: relative;
 	max-height: 200px;

web/js/chatbox.js

@@ -7,6 +7,11 @@ componentconstructors['chatbox'] = function(dynmap, configuration) {
 		.addClass('messagelist')
 		.appendTo(chat);
 
+	if (dynmap.options.scrollback) {
+		messagelist.addClass('scrollback')
+			.click( function() { $(this).hide(); } );		 
+	}
+
 	if (dynmap.options.allowwebchat) {
 		var chatinput = $('<input/>')
 			.addClass('chatinput')
@@ -25,10 +30,22 @@ componentconstructors['chatbox'] = function(dynmap, configuration) {
 				}
 			})
 			.appendTo(chat);
+
+		if (dynmap.options.scrollback) {
+			chatinput.click(function(){ 
+				var m = $('.messagelist');
+				m.show().scrollTop(m.scrollHeight());
+			});
+		}
 	}
 	
 	var addrow = function(row) {
-		setTimeout(function() { row.remove(); }, (configuration.messagettl * 1000));
+		if (dynmap.options.scrollback) {
+			var c = messagelist.children();
+			c.slice(0, Math.max(0, c.length-dynmap.options.scrollback)).each(function(index, elem){ $(elem).remove(); });
+		} else {
+			setTimeout(function() { row.remove(); }, (configuration.messagettl * 1000));
+		}
 		messagelist.append(row);
 		messagelist.show();
 		messagelist.scrollTop(messagelist.scrollHeight());
@@ -50,7 +67,7 @@ componentconstructors['chatbox'] = function(dynmap, configuration) {
 	
 	$(dynmap).bind('chat', function(event, message) {
 		var playerName = message.name;
-        var playerAccount = message.account;
+		var playerAccount = message.account;
 		var messageRow = $('<div/>')
 			.addClass('messagerow');
 
@@ -58,7 +75,7 @@ componentconstructors['chatbox'] = function(dynmap, configuration) {
 			.addClass('messageicon');
 
 		if (message.source === 'player' && configuration.showplayerfaces &&
-            playerAccount) {
+			playerAccount) {
 			getMinecraftHead(playerAccount, 16, function(head) {
 				messageRow.icon = $(head)
 					.addClass('playerIcon')
@@ -66,12 +83,12 @@ componentconstructors['chatbox'] = function(dynmap, configuration) {
 			});
 		}
 
-        var playerChannelContainer = '';
-        if (message.channel) {
-            playerChannelContainer = $('<span/>').addClass('messagetext')
-            .text('[' + message.channel + '] ')
-            .appendTo(messageRow);
-        }
+		var playerChannelContainer = '';
+		if (message.channel) {
+			playerChannelContainer = $('<span/>').addClass('messagetext')
+			.text('[' + message.channel + '] ')
+			.appendTo(messageRow);
+		}
 			
 		if (message.source === 'player' && configuration.showworld) {
 			var playerWorldContainer = $('<span/>')