Maintain Pan and Zoom State on Rebind

Normally, the Kendo UI Chart resets the axis range after the data source fetches new data. If users pan or zoom the Chart, they will see the initial viewport after the new data is loaded.

The following example demonstrates how to store and load the axis range. Changes are detected in the drag and zoom events. The axis range is restored in the databound event.

    <button id="rebind">Rebind Chart</button>
    <div id="chart"></div>
    <script>
      // Sample data
      var data = [];
      for (var i = 0; i < 100; i++) {
        var val = Math.round(Math.random() * 10);
        data.push({
          category: "C" + i,
          value: val
        });
      }

      function createChart() {
        var axisMin = 0;
        var axisMax = 10;

        function updateRange(e) {
          var axis = e.sender.getAxis('axis')
          var range = axis.range()
          axisMin = range.min;
          axisMax = range.max;
        }

        function restoreRange(e) {
          e.sender.options.categoryAxis.min = axisMin;
          e.sender.options.categoryAxis.max = axisMax;
        }

        $("#chart").kendoChart({
          renderAs: "canvas",
          dataSource: {
            data: data
          },
          categoryAxis: {
            name: "axis",
            min: axisMin,
            max: axisMax,
            labels: {
              rotation: "auto"
            }
          },
          series: [{
            type: "column",
            field: "value",
            categoryField: "category"
          }],
          pannable: {
            lock: "y"
          },
          zoomable: {
            mousewheel: {
              lock: "y"
            },
            selection: {
              lock: "y"
            }
          },
          zoom: updateRange,
          drag: updateRange,
          dataBound: restoreRange
        });
      }

      $("#rebind").click(function() {
        $("#chart").data("kendoChart").dataSource.read();
      });

      $(document).ready(createChart);
    </script>

See Also

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