tests/is-zoomed.html

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