File: input.html

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jsxgraph 1.3.5+dfsg1-2
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<html>
<head>
   <title>JSXGraph example</title>
   <link rel="stylesheet" type="text/css" href="../distrib/jsxgraph.css" />
   <script type="text/javascript" src="/javascript/prototype/prototype.js"></script>
   <script type="text/javascript" src="../src/loadjsxgraph.js"></script>
</head>
<body>
  <h2>Input example</h2>
  <div id="jxgbox" class="jxgbox" style="width:700px; height:500px;"></div>
  <div id="debug" style="display:none;"></div>
   <script type="text/javascript">
    /* <![CDATA[ */

        board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,8,8,-5], axis:true});
        b1axisx = board.create('axis', [[0,0], [1,0]], {});
        b1axisy = board.create('axis', [[0,0], [0,1]], {});

        var input = board.create('input', [-4, 7, 'sin(x)*x', 'f(x)='], {});
        var f = board.jc.snippet(input.Value(), true, 'x', false);
        var graph = board.create('functiongraph',[f,
                function() {
                  var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board);
                  return c.usrCoords[1];
                },
                function() {
                  var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[board.canvasWidth,0],board);
                  return c.usrCoords[1];
                }
              ]);

        board.create('text', [1, 6.7, '<button onclick="updateGraph()">Update graph</button>']);

        var updateGraph = function() {
            graph.Y = board.jc.snippet(input.Value(), true, 'x', false);
            graph.updateCurve();
            board.update();
        }
  /* ]]> */
  </script>
</body>
</html>