javascript/JavaScript-Design-Patterns/The-Bridge-Pattern/5 - XHR connection queue example page.html at master · yangjitang77/javascript · GitHub

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
  "http://www.w3.org/TR/html4/strict.dtd">
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>Ajax Connection Queue</title>
    <script src="utils.js"></script>
    <script src="queue.js"></script>
    <script type="text/javascript">
      addEvent(window, 'load', function() {
        // Implementation.
        // 创建队列
        var q = new DED.Queue;
        q.setRetryCount(5);  // 重试次数
        q.setTimeout(3000);

        var items = $('items');
        var results = $('results');
        var queue = $('queue-items');

        // Keeping track of my own requests as a client.
        var requests = [];

        // Notifier for each request that is being flushed.
        q.onFlush.subscribe(function(data) {
          results.innerHTML = data;
          requests.shift();
          queue.innerHTML = requests.toString();
        });
        // Notifier for any failures.
        q.onFailure.subscribe(function() {
          results.innerHTML += ' <span style="color:red;">Connection Error!</span>';
        });
        // Notifier of the completion of the flush.
        q.onComplete.subscribe(function() {
          results.innerHTML += ' <span style="color:green;">Completed!</span>';
        });
        var actionDispatcher = function(element) {
          switch (element) {
            case 'flush':
              q.flush();
              break;
            case 'dequeue':
              q.dequeue();
              requests.pop();
              queue.innerHTML = requests.toString();
              break;
            case 'pause':
              q.pause();
              break;
            case 'clear':
              q.clear();
              requests = [];
              queue.innerHTML = '';
              break;
          }
        };

        var addRequest = function(request) {
          var data = request.split('-')[1];
          q.add({
            method: 'GET',
            uri: 'bridge-connection-queue.php?ajax=true&s='+data,
            params: null
          });
          requests.push(data);
          queue.innerHTML = requests.toString();
        };
        addEvent(items, 'click', function(e) {
          var e = e || window.event;
          var src = e.target || e.srcElement;
          try {
            e.preventDefault();
          }
          catch (ex) {
            e.returnValue = false;
          }
          actionDispatcher(src.id);
        });

        var adders = $('adders');
        addEvent(adders, 'click', function(e) {
          var e = e || window.event;
          var src = e.target || e.srcElement;
          try {
            e.preventDefault();
          }
          catch (ex) {
            e.returnValue = false;
          }
          addRequest(src.id);
        });
      });
    </script>
    <style type="text/css" media="screen">
      body { font: 100% georgia,times,serif; }
      h1, h2 { font-weight: normal; }
      #queue-items { height: 1.5em; }
      #add-stuff {
        padding: .5em;
        background: #ddd;
        border: 1px solid #bbb;
      }
      #results-area { padding: .5em;border: 1px solid #bbb; }
    </style>
  </head>
  <body id="example">
    <div id="doc">
      <h1>Ajax Connection Queue</h1>
      <div id="queue-items"></div>
      <div id="add-stuff">
        <h2>Add Requests to Queue</h2>
        <ul id="adders">
          <li><a href="#" id="action-01">Add "01" to Queue</a></li>
          <li><a href="#" id="action-02">Add "02" to Queue</a></li>
          <li><a href="#" id="action-03">Add "03" to Queue</a></li>
        </ul>
      </div>
      <h2>Other Queue Actions</h2>
      <ul id='items'>
        <li><a href="#" id="flush">Flush</a></li>
        <li><a href="#" id="dequeue">Dequeue</a></li>
        <li><a href="#" id="pause">Pause</a></li>
        <li><a href="#" id="clear">Clear</a></li>
      </ul>
      <div id="results-area">
        <h2>Results: </h2>
        <div id="results"></div>
      </div>
    </div>
  </body>
</html>