Live Regions Example 2

<div role="application">
<script type="text/javascript">
  var live2 = new Live2();
/*  widgets.add( live2 ); */
</script>

<div>
  <h2>Set Text Live Region ARIA Properties</h2>

  <ul class="controls">  
    <li>
      <label for="throttle">Seconds before a change</label>
      <select id="throttle"  onblur="setMinimumTime('throttle');" onchange="setMinimumTime('throttle');">
        <option>1</option>
        <option>2</option>
        <option>3</option>
        <option>4</option>
        <option>5</option>
        <option>6</option>
        <option>7</option>
        <option>8</option>
        <option>9</option>
        <option selected="selected">10</option>
        <option>11</option>
        <option>12</option>
        <option>13</option>
        <option>14</option>
        <option>15</option>
      </select>
    </li>
  
  <li>
       <label for="politenessLevel">Politeness Level</label>
       <select id="politenessLevel"
         onblur="updateAttribute('aria-polite', 'politenessLevel', 'visibleText');"
         onchange="updateAttribute('aria-polite', 'politenessLevel', 'visibleText');">
         <option>off</option>
         <option>polite</option>
         <option selected="selected">assertive</option>
         <option>rude</option>
       </select>
    </li>
  
    <li>
       <label for="atomControl">Atomic</label>
       <select id="atomControl"
         onblur="updateAttribute('aria-atomic', 'atomControl', 'visibleText');"
         onchange="updateAttribute('aria-atomic', 'atomControl','visibleText');">
         <option>true</option>
         <option>false</option>
       </select>
  </li>  
  
    <li>
       <label for="channelControl1">Channel</label>
       <select id="channelControl1"
         onblur="updateAttribute('aria-channel', 'channelControl1', 'visibleText');"
         onchange="updateAttribute('aria-channel', 'channelControl1', 'visibleText');">
         <option>general</option>
         <option>notify</option>
       </select>
    </li>
  
  <li>
       <label for="replaceText">Replace Text or Add on?</label>
       <select id="replaceText" onblur="setReplace('replaceText');" onchange="setReplace('replaceText');">
         <option>Add on</option>
         <option>Replace</option>
       </select>
   </li>    
    
  </ul>
  
  <h2>Set Message Live Region ARIA Properties</h2>
  
  <ul class="controls">  
  
    <li>
      <label for="politenessLevel2">Politeness Level</label>
      <select id="politenessLevel"
        onblur="updateAttribute('aria-live', 'politenessLevel', lrID);"
        onchange="updateAttribute('aria-live','politenessLevel', lrID);">
        <option>off</option>
        <option>polite</option>
        <option selected="selected">assertive</option>
        <option>rude</option>
      </select>
    </li>
  
  <li>
      <label for="channelControl2">Channel</label>
      <select id="channelControl2"
        onblur="updateAttribute('aria-channel', 'channelControl2', lrID);"
        onchange="updateAttribute('aria-channel', 'channelControl2', lrID);">
        <option>general</option>
        <option>notify</option>
      </select>
   </li>    
    
  </ul>

</div>

<h2>Live region example: Reader</h2>

<p>Description: Click the button below to start reading.  Each sentence will appear for the time set above.  Every so often a message will interrupt you.</p>

<p><button onclick="live2.init()">Begin reading</button> </p>

<h3>Message</h3>

<div class="message"
     role="description"
     aria-live="rude">
     <span id="messages"></span>
</div>

<h3>Text</h3>

<div class="hide" id="text"></div>

<div class="text"
     role="log"
     aria-live="polite"
     id="visibleText"></div>



</div>

  <script type="text/javascript">
/**
*
* The Globale Variables
*/

if (!window.Node) {
  var Node = {            // If there is no Node object, define one
    ELEMENT_NODE: 1,    // with the following properties and values.
    ATTRIBUTE_NODE: 2,  // Note that these are HTML node types only.
    TEXT_NODE: 3,       // For XML-specific nodes, you need to add
    COMMENT_NODE: 8,    // other constants here.
    DOCUMENT_NODE: 9,
    DOCUMENT_FRAGMENT_NODE: 11
  }
}


var KEY_PAGEUP   = 33;
var KEY_PAGEDOWN = 34;
var KEY_END      = 35;
var KEY_HOME     = 36;

var KEY_LEFT     = 37;
var KEY_UP       = 38;
var KEY_RIGHT    = 39;
var KEY_DOWN     = 40;

var KEY_SPACE    = 32;
var KEY_TAB      = 9;

var KEY_BACKSPACE = 8;
var KEY_DELETE    = 46;
var KEY_ENTER     = 13;
var KEY_INSERT    = 45;
var KEY_ESCAPE    = 27;

var KEY_F1        = 112;
var KEY_F2        = 113;
var KEY_F3        = 114;
var KEY_F4        = 115;
var KEY_F5        = 116;
var KEY_F6        = 117;
var KEY_F7        = 118;
var KEY_F8        = 119;
var KEY_F9        = 120;
var KEY_F10       = 121;

var KEY_M         = 77;

var NS_XHTML = "http://www.w3.org/1999/xhtml"
var NS_STATE = "http://www.w3.org/2005/07/aaa";

// **********************************************
// *
// * Commonly used helper functions
// *
// **********************************************

/**
*
* nextSiblingElement
*
* @contructor
*/

function nextSiblingElement( node ) {

  var next_node = node.nextSibling;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.nextSibling;
  }  // endwhile

  return next_node;
  
}

/**
*
* previousSiblingElement
*
* @param ( node ) node object for which you are looking for the next sibling element node
*
* @return ( node) next sibling or "null"
*/

function previousSiblingElement( node ) {

  var next_node = node.previousSibling;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.previousSibling;
  }  // endwhile

  return next_node;
  
}

/**
*
* firstChildElement
*
* @param ( node ) node object for which you are looking for the first child element node
*
* @return ( node) next sibling or "null"
*/

function firstChildElement( node ) {

  var next_node = node.firstChild;

  while( next_node
    && (next_node.nodeType != Node.ELEMENT_NODE) ) {
    next_node = next_node.nextSibling;
  }  // endwhile


  return next_node;
  
}

/**
*
* getTextContentOfNode
*
* @contructor
*/

function getTextContentOfNode( node ) {

  var next_node = node.firstChild;
  var str = "";

  while( next_node ) {
    
    if( (next_node.nodeType == Node.TEXT_NODE ) &&
      (next_node.length > 0 )
     )
      str += next_node.data;
    
    
    next_node = next_node.nextSibling;
    
  }  // endwhile

  return str;
  
}

/**
*
* setTextContentOfNode
*
* @contructor
*/

function setTextContentOfNode( node, text ) {

   // Generate a new text node with the text value
    var text_node = document.createTextNode(text);
  
    // Remove child nodes to remove text
    while (node.firstChild) {
      node.removeChild(node.firstChild);
    } // while

    // Append new text to the container element
    node.appendChild( text_node );

}
  </script>

  <script type="text/javascript">
// JavaScript Document
// Widgets is a way to initialize widgets in the ARIA examples


function Widgets() {
  this.widgets = new Array();
}

/**
* add is member of the Widgets Object
* and used add a widget ot the list of widgets to be intitialized
* as part of the onload event
* The controls array is the list of controls to initialize
* @member Enable
* @return none
*/

Widgets.prototype.add = function(obj) {
  this.widgets[this.widgets.length] = obj;
}

/**
* init is member of the Widgets Object
* and is called by the onload event to initialize widgets in the web resource
* The controls array is the list of controls to initialize
* @member Enable
* @return none
*/

Widgets.prototype.init = function() {
     
   for(var i = 0; i < this.widgets.length; i++ )
     this.widgets[i].init();
}

var widgets = new Widgets();

function initApp() {
  widgets.init();
}

  </script>

  <script type="text/javascript">
// JavaScript Document
// This module is to abstract browser dependencies
// This makes the widget code cleaner and earier to read by making most browser specfic coding
// in one place rather han scatered throghot documents
var ARIA_STATE = "aria-";

//
// WebBrowser object to abstract accessibility API differences between web standards supporting browsers and Internet Explorer 7.0
//
// The state variable keeps track of current state of checkbox
function WebBrowser() {

}


//
// keyCode is a function to get the keycode from a keypress event
//
// @param ( event object) event is an event object
//
// @return ( keycode )

WebBrowser.prototype.keyCode = function( event ) {
  var e = event || window.event;
  
  return e.keyCode;
}  

/**
* OnClick Event Simulator
*
* @param ( node ) DOM node object
* @return nothing
*/

if( document.createEvent ) {

  // If a web standards based browser implement this function

  WebBrowser.prototype.simulateOnClickEvent = function( node ) {
    // W3C DOM Events way to trigger a "click" event
    var e = document.createEvent('MouseEvents');
    e.initEvent( 'click', true, true );

    node.dispatchEvent( e );

  }

} else {

  // If a Microsoft IE based browser implement this function
  
  WebBrowser.prototype.simulateOnClickEvent = function( node ) {

    var e = document.createEventObject();
    node.fireEvent( "onclick", e );

  } // endif

}

if ( document.addEventListener ) {

  // If a web standards based browser implement this function

  WebBrowser.prototype.setMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

    if( clickHandler )
      document.addEventListener( "click",     clickHandler, true );
    
    if( downHandler )
      document.addEventListener( "mousedown", downHandler,  true );

    if( moveHandler )
      document.addEventListener( "mousemove", moveHandler,  true );
    
    if( upHandler)
      document.addEventListener( "mouseup",   upHandler,    true );

  }

  WebBrowser.prototype.releaseMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

  if( upHandler)
      document.removeEventListener( "mouseup",   upHandler,    true );
      
    if( moveHandler )
      document.removeEventListener( "mousemove", moveHandler,  true );
    
    if( downHandler )
      document.removeEventListener( "mousedown", downHandler,  true );
      
    if( clickHandler )
      document.removeEventListener( "click",     clickHandler, true );

  }

} else {

  // If a Microsoft IE based browser implement this function

  WebBrowser.prototype.setMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

   node.setCapture();
   if( clickHandler)
     node.attachEvent( "onclick", clickHandler );
    
   if( downHandler)
     node.attachEvent( "onmousedown", downHandler );
    
   if( moveHandler )
     node.attachEvent( "onmousemove", moveHandler );
    
   if( upHandler )
     node.attachEvent( "onmouseup", upHandler );

  } // endif

  WebBrowser.prototype.releaseMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

   if( upHandler )
     node.detachEvent( "onmouseup", upHandler );
    
   if( moveHandler )
     node.detachEvent( "onmousemove", moveHandler );
    
   if( downHandler)
     node.detachEvent( "onmousedown", downHandler );
    
   if( clickHandler)
     node.detachEvent( "onclick", clickHandler );
    
     node.releaseCapture();

  } // endif


}




if (typeof document.documentElement.setAttributeNS != 'undefined') {

  WebBrowser.prototype.stopPropagation = function( event ) {
    if( event.stopPropagation )
      event.stopPropagation();
    if( event.preventDefault )
      event.preventDefault();
    return false;
  }

  WebBrowser.prototype.target = function( event ) {
  return event.target;
  }
  
  WebBrowser.prototype.attrName = function( event ) {
  return event.attrName;
  }

  WebBrowser.prototype.testAttrName = function( event , attrName) {
  return event.attrName == attrName;
  }

  WebBrowser.prototype.charCode = function(event) {
     return event.charCode;
  }

  WebBrowser.prototype.calculateOffsetLeft = function( node ) {
  return node.offsetLeft;    
  }
  
  WebBrowser.prototype.calculateOffsetTop = function( node ) {
  return node.offsetTop;    
  }
  
  WebBrowser.prototype.pageX = function( e ) {
    return e.pageX;    
  }
  
  WebBrowser.prototype.pageY = function( e ) {
    return e.pageY;    
  }
  
  WebBrowser.prototype.setNodePosition = function(node,left,top) {
    node.style.left = left+"px";
    node.style.top = top+"px";
  }


} else {

  WebBrowser.prototype.stopPropagation = function( event ) {
    event.cancelBubble = true;
    event.returnValue = false;
    return false;
  }

  WebBrowser.prototype.charCode = function(event) {
    return window.browser.keyCode( event );
  }

  WebBrowser.prototype.target = function( event ) {
    return event.srcElement;
  }

  WebBrowser.prototype.attrName = function( event ) {
  return event.propertyName;
  }
    
  WebBrowser.prototype.testAttrName = function( event , attrName) {
        
        var str = attrName;
        
        if( attrName.indexOf("aria-") >=0 ) {
            str = attrName.replace(/aria-/,"");
            var node = document.getElementById('test1');
            if( node )
               node.innerHTML = str.substr(0,1).toUpperCase();
            var len  = str.length;
            str = "aria" + str.substr(0,1).toUpperCase() + str.substr(1, len);
            var node = document.getElementById('test2');
//            if( node )
//               node.innerHTML = node.innerHTML + "<li>" + str + "</li>";
        }
        
        return event.propertyName == str;
  }
    
  WebBrowser.prototype.calculateOffsetLeft = function(node) {
  var offset = 0;
  
  while( node ) {
    offset += node.offsetLeft;
    node = node.offsetParent;
  }
  
  return offset;    
  }
  
  WebBrowser.prototype.calculateOffsetTop = function(node) {
  var offset = 0;
  
  while( node ) {
    offset = offset + node.offsetTop;
    node = node.offsetParent;
  }
  
  return offset;    
  }
  
  WebBrowser.prototype.pageX = function( e ) {
    return e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft);    
  }
  
  WebBrowser.prototype.pageY = function( e ) {
    return e.clientY + (document.documentElement.scrollTop || document.body.scrollTop);    
  }
  
  WebBrowser.prototype.setNodePosition = function(node,left,top) {
    offsetx = 0;
    offsety = 0;
    nnode = node.offsetParent
    while( nnode ) {
      offsetx = offsetx + nnode.offsetLeft;
      offsety = offsety + nnode.offsetTop;
      nnode = nnode.offsetParent;
    }
    node.style.left = left-offsetx+"px";
    node.style.top = top-offsety+"px";
  }
  
};


if (document.addEventListener) {

     // Functions for W3C Standards compliant implementation of adding event handlers

     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       elmTarget.addEventListener(sEventName, fCallback, false);
       returnValue = true;
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       elmTarget.removeEventListener(sEventName, fCallback, false);
       returnValue = true;
     };

     WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
      elmTarget.addEventListener("DOMAttrModified", fCallback, false);
      returnValue = true;
    };

} else {

  if(document.attachEvent) {

     // IE Specific Event handler functions
     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       returnValue = elmTarget.attachEvent('on' + sEventName, fCallback);
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       returnValue = elmTarget.detachEvent('on' + sEventName, fCallback);
     };

    WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
      returnValue = elmTarget.attachEvent("onpropertychange", fCallback);
    };

  } else {

     // For browsers that do not support W3C or IE event functions
     WebBrowser.prototype.addEvent = function(elmTarget, sEventName, fCallback) {
       return false;
     };

     WebBrowser.prototype.removeEvent = function(elmTarget, sEventName, fCallback) {
       return false;
     };

     WebBrowser.prototype.addChangeEvent =  function(elmTarget, fCallback) {
       return false;
     };

  }

}

var browser = new WebBrowser();

  </script>

  <script type="text/javascript">
var minimumTime = 7000;
var index=0;
var conter = 0;
var lrID = "messages";
var messagesArray = new Array("...","you have new mail.", "there are new news feeds.");
var isInit = false;
var replaceText = false;

function Live2() {
  
}

Live2.prototype.init = function () {
    if (!isInit){
        loadXMLDoc('mobydick.xml');
        transferNode();
        isInit = true;
    runExample();
    }
}

function updateLiveRegion(liveRegionID, itemNumber){
    textNode= document.createTextNode(messagesArray[index]);  
    targetNode = document.getElementById(liveRegionID);
    while (targetNode.firstChild) {
        targetNode.removeChild(targetNode.firstChild);
    }
  targetNode.appendChild(textNode);
}


function runExample(){
    updateLiveRegion(lrID,index);
   if (index >= messagesArray.length-1){
       index=0;
   }
   else{
       index++;
   }
   window.setTimeout(runExample, Math.floor(Math.random()*30001));
}

function transferNode(){
    var source = document.getElementById("text");
    if(source.firstChild.innerHTML == null){  //textnode
        source.removeChild(source.firstChild);
    }
    var copyNode = source.firstChild;
    var target = document.getElementById("visibleText");

    if (target.firstChild && replaceText){
    while (target.firstChild)
        target.removeChild(target.firstChild);
    }
    source.removeChild(copyNode);
    target.appendChild(copyNode);
    window.setTimeout(transferNode, minimumTime);

}

function setMinimumTime(throttleId){
   minimumTimeStr = document.getElementById(throttleId).options[document.getElementById(throttleId).selectedIndex].text;  
   minimumTime = minimumTimeStr * 1000;
}

function updateAttribute(attribute, controlId, regionId){
    input =  document.getElementById(controlId).options[document.getElementById(controlId).selectedIndex].text;
    document.getElementById(regionId).setAttribute(attribute, input);
}

function setReplace(controlId){
    input =  document.getElementById(controlId).options[document.getElementById(controlId).selectedIndex].text;
    if(input == "Replace")
        replaceText = true;
    else if(input == "Add on")
        replaceText = false;
        
}


var req;

function loadXMLDoc(url) {
  req = false;
    // branch for native XMLHttpRequest object
    if(window.XMLHttpRequest && !(window.ActiveXObject)) {
      try {
      req = new XMLHttpRequest();
        } catch(e) {
      req = false;
        }
    // branch for IE/Windows ActiveX version
    } else if(window.ActiveXObject) {
         try {
          req = new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
          try {
              req = new ActiveXObject("Microsoft.XMLHTTP");
          } catch(e) {
              req = false;
          }
    }
    }
  if(req) {
    req.onreadystatechange = state_Change;
    req.open("GET", url, false);  // needs to be synchronous so the script can act on the data loaded.
    req.send("");
  }
}


function state_Change() {
// if xmlhttp shows "loaded"
if (req.readyState==4) {
  // if "OK"

  if (req.status==200)
  {
  document.getElementById('text').innerHTML=req.responseText;
  }
  else
  {
  alert("Problem retrieving data:" + req.statusText);
  }
  }
}
  </script>

  <style type="text/css">
.hide{
  display:none;
}

.live{
    background-color:#C0C0C0;
}

div.text {
  padding: .5em;
  border: thin solid black;
}

div#visibleText p {
  margin: 0;
  padding: 0;
  padding-bottom: .25em;
}

div.message {
  padding: .5em;
  border: thin solid black;
  background-color: #CCCCCC;
}  </style>