Calculate and Set Major Unit for Value Axis
Sometimes you might need to calculate and set the major unit for the values axis in a Kendo UI Chart.
In this scenario, you also need to name the axis. The effective axis range is available in the render event handler.
The API reference for the relevant methods and events that are used in the following example are:
- The
renderevent - The
getAxis()method - The
kendo.dataviz.ChartAxisAPI
<div class="clearfix" id="FirstChart"></div>
<script>
var TestDataSource =[{"SeriesName":"Series 1","Views":419,"DayDate":"2016-08-31T18:30:00.000Z"},{"SeriesName":"Series 1","Views":224,"DayDate":"2016-08-31T19:30:00.000Z"},{"SeriesName":"Series 1","Views":196,"DayDate":"2016-08-31T20:30:00.000Z"},{"SeriesName":"Series 1","Views":405,"DayDate":"2016-08-31T21:30:00.000Z"},{"SeriesName":"Series 1","Views":202,"DayDate":"2016-08-31T22:30:00.000Z"},{"SeriesName":"Series 1","Views":189,"DayDate":"2016-08-31T23:30:00.000Z"},{"SeriesName":"Series 1","Views":438,"DayDate":"2016-09-01T00:30:00.000Z"},{"SeriesName":"Series 2","Views":863,"DayDate":"2016-09-01T01:30:00.000Z"},{"SeriesName":"Series 1","Views":1231,"DayDate":"2016-09-01T02:30:00.000Z"},{"SeriesName":"Series 1","Views":4289,"DayDate":"2016-09-01T03:30:00.000Z"},{"SeriesName":"Series 1","Views":2791,"DayDate":"2016-09-01T04:30:00.000Z"},{"SeriesName":"Series 1","Views":2381,"DayDate":"2016-09-01T05:30:00.000Z"},{"SeriesName":"Series 2","Views":4000,"DayDate":"2016-09-01T06:30:00.000Z"},{"SeriesName":"Series 1","Views":2224,"DayDate":"2016-09-01T07:30:00.000Z"},{"SeriesName":"Series 1","Views":2134,"DayDate":"2016-09-01T08:30:00.000Z"},{"SeriesName":"Series 1","Views":1944,"DayDate":"2016-09-01T09:30:00.000Z"},{"SeriesName":"Series 1","Views":2101,"DayDate":"2016-09-01T10:30:00.000Z"},{"SeriesName":"Series 1","Views":1884,"DayDate":"2016-09-01T11:30:00.000Z"},{"SeriesName":"Series 2","Views":1950,"DayDate":"2016-09-01T12:30:00.000Z"},{"SeriesName":"Series 1","Views":1965,"DayDate":"2016-09-01T13:30:00.000Z"},{"SeriesName":"Series 1","Views":2505,"DayDate":"2016-09-01T14:30:00.000Z"},{"SeriesName":"Series 2","Views":3004,"DayDate":"2016-09-01T15:30:00.000Z"},{"SeriesName":"Series 1","Views":2118,"DayDate":"2016-09-01T16:30:00.000Z"},{"SeriesName":"Series 1","Views":1017,"DayDate":"2016-09-01T17:30:00.000Z"},{"SeriesName":"Series 2","Views":2800,"DayDate":"2016-08-31T18:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-08-31T19:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-08-31T20:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-08-31T21:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-08-31T22:30:00.000Z"},{"SeriesName":"Series 2","Views":500,"DayDate":"2016-08-31T23:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T00:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T01:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T02:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T03:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T04:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T05:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T06:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T07:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T08:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T09:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T10:30:00.000Z"},{"SeriesName":"Series 2","Views":0,"DayDate":"2016-09-01T11:30:00.000Z"},{"SeriesName":"Series 2","Views":900,"DayDate":"2016-09-01T12:30:00.000Z"}];
function createChart(divId,dataToPlot) {
$("#"+divId).kendoChart({
dataSource: {
data: dataToPlot,
group: {
field: "SeriesName"
},
schema: {
model: {
fields: {
DayDate: {
type: "date"
}
}
}
}
},
seriesDefaults: {
type: "line",
style: "smooth"
},
series: [{
type: "line",
field:"Views",
name: "#=group.value#",
categoryField: "DayDate",
missingValues: "zero"
}],
legend: {
position: "top"
},
categoryAxis: {
labels: {
format: "HH:mm",
rotation: 315
},
crosshair: {
visible: false
},
padding: {
},
majorGridLines: {
visible: false
},
min: new Date("2016-09-01 00:00"),
max: new Date("2016-09-01 23:00"),
baseUnit: "hours",
},
valueAxis: {
// Axis must be named
name: "value",
labels: {
format: "{0:n0}",
},
},
title: {
text: "Test Major Grid Lines"
},
tooltip: {
visible: true,
},
render: function(e) {
// Effective axis range is available in the render event
//
// See
// http://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/chart/events/render
// http://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/chart/methods/getAxis
// http://docs.telerik.com/kendo-ui/api/javascript/dataviz/chart/chart_axis
var range = e.sender.getAxis("value").range();
var majorUnit = range.max / 3;
var axis = e.sender.options.valueAxis;
if (axis.majorUnit !== majorUnit) {
axis.majorUnit = majorUnit;
// We need to redraw the chart to apply the changes
e.sender.redraw();
}
}
});
}
$(function(){
createChart("FirstChart",TestDataSource);
});
</script>