RGraph/docs/domcontentloaded.html

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  21     <title>RGraph: HTML5 canvas graph library - DOMContentLoaded event</title>
  22
  23     <meta name="keywords" content="rgraph html5 canvas graph docs domcontentloaded" />
  24     <meta name="description" content="RGraph: HTML5 canvas graph library - DOMContentLoaded example" />
  25
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  27     <link rel="icon" type="image/png" href="../images/favicon.png">
  28
  29     <meta name="keywords" content="rgraph graph html5 javascript canvas" />
  30     <meta name="description" content="RGraph: The HTML5 graphing library for websites on all platforms" />
  31
  32     <script src="../libraries/RGraph.common.core.js" ></script>
  33     <script src="../libraries/RGraph.line.js" ></script>
  34
  35     <script>
  36         window.onload = function ()
  37         {
  38             var duration = (new Date().getTime() - timer.getTime()) / 1000;
  39             document.getElementById("waiting").innerHTML = '<span style="color: green">Done! Extra time taken: ' + duration.toFixed(1) + ' seconds</span>';
  40             alert('The window.onload event fired, extra time taken: ' + duration.toFixed(1) + ' seconds');
  41         }
  42
  43         function myFunc ()
  44         {
  45             var line = new RGraph.Line('cvs', [4,3,2,4,5,6,7,4,8,9]);
  46             line.Set('chart.labels', ['Dez', 'Fliss','Geoff','Hoolio','John','Rich','Kev','Charles','Lou','Bob']);
  47             line.Set('chart.hmargin', 5);
  48             line.Set('chart.title', 'A demonstration of the DOMContentLoaded event');
  49             line.Set('chart.tickmarks', 'circle');
  50             line.Set('chart.linewidth', 1.01);
  51
  52             if (navigator.userAgent.indexOf('Chrome/6') == -1) {
  53                 line.Set('chart.shadow', true);
  54                 line.Set('chart.shadow.offsetx', 0);
  55                 line.Set('chart.shadow.offsety', 0);
  56                 line.Set('chart.shadow.blur', 15);
  57             }
  58             line.Draw();
  59         }
  60
  61         /**
  62         * Install the function to the appropriate event
  63         */
  64         if(window.addEventListener) {
  65             window.addEventListener('DOMContentLoaded', myFunc, false);
  66         } else {
  67             document.attachEvent("onDOMContentLoaded", myFunc);
  68         }
  69
  70         // Create a timer to show the difference
  71         timer = new Date();
  72     </script>
  73 </head>
  74 <body>
  75
  76     <!-- Social networking buttons -->
  77     <script src="../libraries/RGraph.common.core.js" ></script>
  78
  79     <script>
  80         function HideTwitterDIV ()
  81         {
  82             document.getElementById("twitter_div").style.opacity = 0;
  83             document.getElementById("twitter_div").style.display = 'none';
  84         }
  85
  86
  87         function ShowTwitterDIV (e)
  88         {
  89             var e   = RGraph.FixEventObject(document.all ? event : e);
  90             var div = document.getElementById("twitter_div");
  91             var img = document.getElementById("twitter_icon");
  92
  93             div.style.display = 'block';
  94             div.style.left    = (RGraph.getCanvasXY(img)[0] + img.offsetWidth - div.offsetWidth + 110) + 'px';
  95             div.style.top     = (RGraph.getCanvasXY(img)[1] - 1) + 'px';
  96
  97             /**
  98             * Fade it in
  99             */
 100             setTimeout('document.getElementById("twitter_div").style.opacity = 0.2;', 25);
 101             setTimeout('document.getElementById("twitter_div").style.opacity = 0.4;', 50);
 102             setTimeout('document.getElementById("twitter_div").style.opacity = 0.6;', 100);
 103             setTimeout('document.getElementById("twitter_div").style.opacity = 0.8;', 125);
 104             setTimeout('document.getElementById("twitter_div").style.opacity = 1.0;', 150);
 105
 106             e.stopPropagation();
 107
 108             return false;
 109         }
 110
 111         /**
 112         * This code installs the event handler that hides the Twitter DIV
 113         */
 114         if (RGraph.isIE8()) {
 115              window.attachEvent('onload', function () {document.body.attachEvent('onclick', HideTwitterDIV);});
 116         } else {
 117             window.addEventListener('click', HideTwitterDIV, false);
 118         }
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 129             // Opera fix
 130             if (navigator.userAgent.indexOf('Opera') == -1) {
 131               document.getElementById("social_icons").style.position = 'fixed';
 132               document.getElementById("twitter_div").style.position = 'fixed';
 133
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 145                 <a href="" target="_blank" onmouseover="if (document.getElementById('twitter_div').style.display == 'none') ShowTwitterDIV(event);" onclick="event.stopPropagation(); event.cancelBubble = true; return false">
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 168             </div>
 169     </div>
 170     <!-- /Social networking buttons -->
 171
 172
 173 <div id="breadcrumb">
 174     <a href="../index.html">RGraph: HTML5 canvas graph library</a>
 175     >
 176     <a href="index.html">Documentation</a>
 177     >
 178     DOMContentLoaded event
 179 </div>
 180
 181 <h1>RGraph: HTML5 canvas graph library - DOMContentLoaded example</h1>
 182
 183     <script>
 184         if (RGraph.isIE8()) {
 185             document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 does not natively support the HTML5 canvas tag, so if you want to see the graphs, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag. Click <a href="http://groups.google.com/group/rgraph/browse_thread/thread/c5651ff8c56b8f3c#" target="_blank">here</a> to see some screenshots.</div>');
 186         }
 187     </script>
 188
 189     <p id="waiting" style="; font-weight: bold; font-size: 16pt"><span style="color: #aa0">Waiting for onload event...</span></p>
 190
 191
 192
 193
 194     <p style="background-color: #eee; border: 1px dashed gray; padding: 5px; height: 50px;">
 195         <span style="display: inline-block; margin-left: 10px; float: right">
 196             <script>
 197                 document.write('<img src="http://ie.microsoft.com/testdrive/HTML5/DOMContentLoaded/whidbey.jpg?' + Math.random() + '" width="50" height="50" />&nbsp;');
 198                 document.write('<img src="http://ie.microsoft.com/testdrive/HTML5/DOMContentLoaded/window.jpg?' + Math.random() + '" width="50" height="50" />&nbsp;');
 199                 document.write('<img src="http://ie.microsoft.com/testdrive/HTML5/DOMContentLoaded/whidbey2.jpg?' + Math.random() + '" width="50" height="50" />');
 200             </script>
 201         </span>
 202
 203         These images are here to pad the page and slow down loading so that the window.onload event is slowed. This makes the
 204         difference far more visible.
 205     </p>
 206
 207     <canvas id="cvs" width="600" height="250" style="float: right">[No canvas support]</canvas>
 208
 209     <p>
 210         The DOMContentLoaded event is an extremely useful event and can make a big impact on the performance of your pages, hence this
 211         example. The DOMContentLoaded event fires when the pages HTML and scripts have loaded, but not necessarily any images or CSS.
 212         This can make a big improvement on the apparent speed of your page(s).
 213     </p>
 214
 215     <p>
 216         You can read more about the <i>DOMContentLoaded</i> event on the Mozilla site, <a href="https://developer.mozilla.org/en/Gecko-Specific_DOM_Events" target="_blank">here</a>,
 217         and the Microsoft site <a href="http://ie.microsoft.com/testdrive/HTML5/87DOMContent-Loaded/Default.html" target="_blank">here</a>.
 218     </p>
 219
 220     <br clear="all" />
 221
 222     <pre class="code">
 223 function createGraph(func)
 224 {
 225     if(window.addEventListener) {
 226         window.addEventListener('DOMContentLoaded', func, false);
 227     } else {
 228         document.attachEvent("onDOMContentLoaded", func);
 229     }
 230 }
 231 </pre>
 232
 233     <h4>Browser support</h4>
 234
 235     <p>
 236         The DOMContentLoaded event is supported by the following browsers:
 237     </p>
 238
 239     <ul>
 240         <li>Google Chrome</li>
 241         <li><a href="https://developer.mozilla.org/en/Gecko-Specific_DOM_Events" target="_blank">Mozilla Firefox</a></li>
 242         <li>Apple Safari</li>
 243         <li>Opera ASA. Opera</li>
 244         <li><a href="http://ie.microsoft.com/testdrive/HTML5/87DOMContent-Loaded/Default.html" target="_blank">Microsoft Internet Explorer 9</a></li>
 245     </ul>
 246
 247     <h4>See also</h4>
 248
 249     You might also be interested in <a href="async.html">asynchronous</a> graph creation as an alternative.
 250
 251 </body>
 252 </html>