From 551d2b59bf60a65fa9ad696ec161d1aa9027d5dc Mon Sep 17 00:00:00 2001
From: martinlanghoff <martinlanghoff>
Date: Wed, 12 Jul 2006 02:28:37 +0000
Subject: [PATCH] chat: Prevent user from submitting a 2nd message before his
 1st is received.

Some users reported that mod/chat was silently dropping some messages. The
user's browser may not be able to keep up with the rate at which he submits
chat messages. This update keeps things sane.

Author: Donal McMullan <donal@catalyst.net.nz>
---
 mod/chat/gui_header_js/chatinput.php | 20 ++++++++++++++++----
 mod/chat/gui_header_js/insert.php    |  2 +-
 theme/standard/styles_color.css      |  4 ++++
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/mod/chat/gui_header_js/chatinput.php b/mod/chat/gui_header_js/chatinput.php
index 2ed66eafffa..f3502e2dc4c 100644
--- a/mod/chat/gui_header_js/chatinput.php
+++ b/mod/chat/gui_header_js/chatinput.php
@@ -29,13 +29,25 @@
     ?>
     <script type="text/javascript">
     <!--
+    var waitFlag = false;
     function empty_field_and_submit() {
-        document.sendForm.chat_message.value = document.inputForm.chat_message.value;
-        document.inputForm.chat_message.value = '';
+        if(waitFlag) return false;
+        waitFlag = true;
+        var input_chat_message = document.getElementById('input_chat_message');
+        document.sendForm.chat_message.value = input_chat_message.value;
+        input_chat_message.value = '';
+        input_chat_message.className = 'wait';
         document.sendForm.submit();
-        document.inputForm.chat_message.focus();
         return false;
     }
+
+    function enableForm() {
+        var input_chat_message = document.getElementById('input_chat_message');
+        waitFlag = false;
+        input_chat_message.className = '';
+        input_chat_message.focus();
+    }
+
     // -->
     </script>
     <?php
@@ -46,7 +58,7 @@
 ?>
     <form action="../empty.php" method="POST" target="empty" name="inputForm"
           OnSubmit="return empty_field_and_submit()">
-        &gt;&gt;<input type="text" name="chat_message" size="60" value="" />
+        &gt;&gt;<input type="text" id="input_chat_message" name="chat_message" size="60" value="" />
         <?php helpbutton('chatting', get_string('helpchatting', 'chat'), 'chat', true, false); ?>
     </form>
 
diff --git a/mod/chat/gui_header_js/insert.php b/mod/chat/gui_header_js/insert.php
index 7fd33fb838f..77e127c8a7b 100644
--- a/mod/chat/gui_header_js/insert.php
+++ b/mod/chat/gui_header_js/insert.php
@@ -58,7 +58,7 @@
 
     if ($chatuser->version == 'header_js') {
         /// force msg referesh ASAP
-        echo '<script type="text/javascript">parent.jsupdate.location.href = parent.jsupdate.document.anchors[0].href;</script>';
+        echo '<script type="text/javascript">parent.jsupdate.location.href = parent.jsupdate.document.anchors[0].href;parent.input.enableForm();</script>';
     }
 
     redirect('../empty.php');
diff --git a/theme/standard/styles_color.css b/theme/standard/styles_color.css
index 01a2350d71f..fd771394a32 100644
--- a/theme/standard/styles_color.css
+++ b/theme/standard/styles_color.css
@@ -709,6 +709,10 @@ table.message_search_results td {
   color:#888
 }
 
+#mod-chat-gui_header_js-chatinput .wait {
+    background: #dddddd;
+}
+
 /***
  *** Modules: Choice
  ***/