Index: openacs-4/packages/xowiki/www/ajax/streaming-chat.js
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/www/ajax/Attic/streaming-chat.js,v
diff -u -N
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ openacs-4/packages/xowiki/www/ajax/streaming-chat.js	1 Aug 2007 21:39:26 -0000	1.4.2.2
@@ -0,0 +1,101 @@
+// simple javascript support for streaming ajax based chat interface
+// $Id: streaming-chat.js,v 1.4.2.2 2007/08/01 21:39:26 gustafn Exp $
+// -gustaf neumann   April 2006
+
+function getHttpObject() {
+  var http_request = false;
+  if (window.XMLHttpRequest) { // Mozilla, Safari,...
+    http_request = new XMLHttpRequest();
+  } else if (window.ActiveXObject) { // IE
+    try {
+      http_request = new ActiveXObject('Msxml2.XMLHTTP');
+    } catch (e) {
+      try {
+	http_request = new ActiveXObject('Microsoft.XMLHTTP');
+      } catch (e) {}
+    }
+  }
+  
+  if (!http_request) {
+    alert('Cannot create and instance of XMLHTTP');
+  }
+  return http_request;
+}
+
+function getData() {
+  //alert('access responseText'); // hmm, IE does not allow us to access responstext in state == 3 :(
+  var response = http.responseText.substring(http_last);
+  //alert('access responseText done');
+  // we recognize a complete message by a trailing }\n
+  if (response.match(/\}[\n ]+$/)) {
+    var messages = document.getElementById('messages');
+    var data = eval('(' + response + ')');
+    for (var i=0;i<data.messages.length;i++) {
+      p = document.createElement('p');
+      p.className = 'line';
+      span = document.createElement('span');
+      span.innerHTML = data.messages[i].time;
+      span.className = 'timestamp';
+      p.appendChild(span);
+      
+      span = document.createElement('span');
+      span.innerHTML = '&nbsp;' + data.messages[i].user + '&nbsp;';
+      span.className = 'user';
+      p.appendChild(span);
+      
+      span = document.createElement('span');
+      span.innerHTML = data.messages[i].msg;
+      span.className = 'message';
+      p.appendChild(span);
+      
+      messages.appendChild(p);
+      messages.scrollTop = messages.scrollHeight;
+    }
+    http_last = http.responseText.length;
+  }
+}
+
+var http = getHttpObject();
+var http_last = 0;
+var http_send = getHttpObject();
+
+function chatSendMsg() {
+  var msg = document.getElementById('chatMsg').value;
+    if (msg == '') {
+         return;
+  }
+  //alert(send_url + encodeURIComponent(msg));
+  http_send.open('GET', send_url + encodeURIComponent(msg), true);
+  http_send.onreadystatechange = function() {
+    if (http_send.readyState == 4) {
+      if (http_send.status != 200) {
+	alert('Something wrong in HTTP request, status code = ' + http_send.status);
+      }
+    }
+  };
+  http_send.send(null);
+  document.getElementById('chatMsg').value = '';
+}
+
+function chatSubscribe(subscribe_url) {
+  http.open('GET', subscribe_url, true);
+  http.onreadystatechange = function() {
+    if (http.readyState == 3) {
+      getData();
+    } else if (http.readyState == 4) {
+      // alert('status code =' + http.status);
+      if (http.status == 200) {
+	document.getElementById('chatMsg').value = 'logout';
+	chatSendMsg();
+      } else {
+	alert('Something wrong in HTTP request, status code = ' + http.status);
+      }
+    }
+  };
+  http.send(null);
+  http_last = 0;
+}
+function tell(msg) {
+  document.monitor.window.value =  msg;
+}
+