I'm working with a chart that contains numerous dates. I'm wondering if there is a way to display only specific titles on the chart. For instance, showing the first, last, and every fifth date between them?
I'm working with a chart that contains numerous dates. I'm wondering if there is a way to display only specific titles on the chart. For instance, showing the first, last, and every fifth date between them?
Utilize the ticks configuration setting for customizing axis labels
To extract values from the data, apply the getValue function on the DataTable
getValue requires two arguments, row & column
Both rows and columns are zero-indexed, with the first being represented as 0
data.getValue(0, 0)
To obtain the last value in the initial column, use getNumberOfRows() - 1
data.getValue(data.getNumberOfRows() - 1, 0)To retrieve every fifth element, leverage the modulus operator %,
It is important to note that this may include the first element,
and potentially the last element, depending on the number of rows...
// include every fifth
var tickMarks = [];
for (var i = 0; i < data.getNumberOfRows(); i++) {
if (i % 5 === 0) {
tickMarks.push(data.getValue(i, 0));
}
}
Refer to the following functional code snippet, which only adds the first and last...
google.charts.load('current', {
callback: function () {
var data = new google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Units');
data.addRows([
[new Date(2016,0,1), 100],
[new Date(2016,0,3), 120],
[new Date(2016,0,30), 110],
[new Date(2016,1,1), 170],
[new Date(2016,1,10), 180],
[new Date(2016,1,25), 110],
[new Date(2016,2,1), 170],
[new Date(2016,2,14), 171],
[new Date(2016,2,20), 172],
[new Date(2016,3,12), 173],
[new Date(2016,3,16), 174],
[new Date(2016,3,19), 175],
[new Date(2016,4,12), 176],
[new Date(2016,4,16), 177],
[new Date(2016,4,19), 178],
[new Date(2016,5,12), 179],
[new Date(2016,5,16), 180],
[new Date(2016,5,19), 181],
[new Date(2016,6,12), 190],
[new Date(2016,6,16), 192],
[new Date(2016,6,19), 196],
[new Date(2016,6,24), 192],
[new Date(2016,7,12), 190],
[new Date(2016,7,16), 192],
[new Date(2016,7,19), 196]
]);
var tickMarks = [];
//add the first one
tickMarks.push(data.getValue(0, 0));
//add the last one
tickMarks.push(data.getValue(data.getNumberOfRows() - 1, 0));
var chart = new google.visualization.AreaChart(document.getElementById('chart_div'));
chart.draw(data, {
hAxis: {
format: 'M/d/yy',
ticks: tickMarks
}
});
},
packages: ['corechart']
});<script src="https://www.gstatic.com/charts/loader.js"></script>
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