Google Charts

Crosshairs

Overview

Crosshairs are thin vertical and horizontal lines centered on a data point in a chart. When you, as a chart creator, enable crosshairs in your charts, your users will then be able to target a single element:

Crosshairs can appear on focus, selection, or both. They're available for scatter charts, line charts, area charts, and for the line and area portions of combo charts.

A Simple Example

Hover over the points below, or select them, to see crosshairs:

Here's a complete web page that creates the above chart, with the line for crosshairs in bold:

<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1.1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = new google.visualization.DataTable();
        data.addColumn('number');
        data.addColumn('number');
        for (var i = 0; i < 100; i++)
          data.addRow([Math.floor(Math.random()*100),
                       Math.floor(Math.random()*100)]);
        var options = {
          legend: 'none',
          crosshair: { trigger: 'both' } // Display crosshairs on focus and selection.
        };
        var chart = new google.visualization.ScatterChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

Crosshair Options

The following crosshair options are available:

crosshair: { trigger: 'both' } display on both focus and selection
crosshair: { trigger: 'focus' } display on focus only
crosshair: { trigger: 'selection' } display on selection only
crosshair: { orientation: 'both' } display both horizontal and vertical hairs
crosshair: { orientation: 'horizontal' } display horizontal hairs only
crosshair: { orientation: 'vertical' } display vertical hairs only
crosshair: { color: color_string } set crosshair color to color_string, e.g., 'red' or '#f00'
crosshair: { opacity: opacity_number } set crosshair opacity to opacity_number, with 0.0 being fully transparent and 1.0 fully opaque
crosshair: { focused: { color: color_string } } set crosshair color to color_string on focus
crosshair: { focused: { opacity: opacity_number } } set crosshair opacity to opacity_number on focus
crosshair: { selected: { color: color_string } } set crosshair color to color_string on selection
crosshair: { selected: { opacity: opacity_number } } set crosshair opacity to opacity_number on selection

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