tests/is-zoomed.html

   1 <html>
   2   <head>
   3     <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7; IE=EmulateIE9">
   4     <title>isZoomedIgnoresProgrammaticZoom Flag</title>
   5     <!--[if IE]>
   6     <script type="text/javascript" src="../excanvas.js"></script>
   7     <![endif]-->
   8     <script type="text/javascript" src="../strftime/strftime-min.js"></script>
   9     <script type="text/javascript" src="../rgbcolor/rgbcolor.js"></script>
  10     <script type="text/javascript" src="../dygraph-canvas.js"></script>
  11     <script type="text/javascript" src="../dygraph.js"></script>
  12     <script type="text/javascript" src="data.js"></script>
  13   </head>
  14   <body>
  15     <h1 id="zoom">Determining Zoom</h1>
  16     <p>
  17       It is possible to detect whether a chart has been zoomed in either axis by the use of the <code>isZoomed</code> function.
  18       If called with no argument, it will report whether <em>either</em> axis has been zoomed.
  19       Alternatively it can be called with an argument of either <code>'x'</code> or <code>'y'</code> and it will report the status of just that axis.
  20     </p>
  21
  22     <p>Here's a simple example using <code>drawCallback</code> to display the various zoom states whenever the chart is zoomed:</p>
  23
  24     <div style="width:600px; text-align:center; font-weight: bold; font-size: 125%;">OUTPUT</div>
  25     <div style="width: 750px">
  26       <div style="float: right">
  27         <p>Zoomed: <span id="zoomed">False</span><p/>
  28         <p>Zoomed X: <span id="zoomedX">False</span><p/>
  29         <p>Zoomed Y: <span id="zoomedY">False</span><p/>
  30       </div>
  31       <div class="codeoutput" style="float:left;">
  32       <div id="zoomdiv"></div>
  33       <script type="text/javascript">
  34         new Dygraph(
  35
  36         // containing div
  37         document.getElementById("zoomdiv"),
  38
  39         // CSV or path to a CSV file.
  40         "Date,Value\n" +
  41         "2011-01-07,75\n" +
  42         "2011-01-08,70\n" +
  43         "2011-01-09,90\n" +
  44         "2011-01-10,30\n" +
  45         "2011-01-11,40\n" +
  46         "2011-01-12,60\n" +
  47         "2011-01-13,70\n" +
  48         "2011-01-14,40\n",
  49         {
  50           drawCallback: function(me, initial) {
  51           document.getElementById("zoomed").innerHTML = "" + me.isZoomed();
  52           document.getElementById("zoomedX").innerHTML = "" + me.isZoomed("x");
  53           document.getElementById("zoomedY").innerHTML = "" + me.isZoomed("y");
  54           }
  55         }
  56         );
  57       </script>
  58       </div>
  59     </div>
  60
  61     <p>
  62       <div style="clear:both; width:600px; text-align:center; font-weight: bold; font-size: 125%;">HTML</div>
  63
  64 <pre>
  65   new Dygraph(
  66
  67   // containing div
  68   document.getElementById(&quot;zoomdiv&quot;),
  69
  70   // CSV or path to a CSV file.
  71   &quot;Date,Temperature\n&quot; +
  72   &quot;2011-01-07,75\n&quot; +
  73   &quot;2011-01-08,70\n&quot; +
  74   &quot;2011-01-09,90\n&quot; +
  75   &quot;2011-01-10,30\n&quot; +
  76   &quot;2011-01-11,40\n&quot; +
  77   &quot;2011-01-12,60\n&quot; +
  78   &quot;2011-01-13,70\n&quot; +
  79   &quot;2011-01-14,40\n&quot;,
  80   {
  81     drawCallback: function(me, initial) {
  82     document.getElementById(&quot;zoomed&quot;).innerHTML = &quot;&quot; + me.isZoomed();
  83     document.getElementById(&quot;zoomedX&quot;).innerHTML = &quot;&quot; + me.isZoomed(&quot;x&quot;);
  84     document.getElementById(&quot;zoomedY&quot;).innerHTML = &quot;&quot; + me.isZoomed(&quot;y&quot;);
  85     }
  86   }
  87   );
  88 </pre>
  89     </p>
  90
  91     <p>The <a href="tests/zoom.html">Tests for zoom operations</a> show a full example of this in action.</p>
  92
  93     <h3>Programmatic Zoom</h3>
  94     <p>
  95       When a chart is programmatically zoomed by updating either the <code>dateWindow</code>
  96       or <code>valueRange</code> option, by default the zoomed flags are also updated correspondingly.
  97       It is possible to prevent this by specifying the <code>isZoomedIgnoreProgrammaticZoom</code> in the same
  98       call to the <code>updateOptions</code> method.
  99     </p>
 100     <p>
 101       The <a href="tests/is-zoomed-ignore-programmatic-zoom.html">is-zoomed-ignore-programmatic-zoom</a> test shows this in operation.
 102     </p>
 103   </body>
 104 </html>