Add Hyperlink To Custom Tooltip In Google Charts

Using this workaround, I was able to mimic showing tooltip upon selection for a google timeline chart. This issue is that I plan on having a mail to link in the tooltip for the use

Solution 1:

looks like pointer-events are set to 'none' by default

change to 'auto' before injecting the clone back into the dom

//inject clone into document
chart.ttclone.style.pointerEvents = 'auto';
tooltip.parentNode.insertBefore(chart.ttclone, chart.tooltip);

see following working snippet...

google.charts.load('current', {
  callback: function () {
    var container = document.getElementById('timeline');
    var chart = new google.visualization.Timeline(container);
    var dataTable = new google.visualization.DataTable();

    dataTable.addColumn({
      type: 'string',
      id: 'President'
    });
    dataTable.addColumn({ type: 'string', id: 'Name' });
    dataTable.addColumn({ type: 'string', role: 'tooltip', 'p': {'html': true}});
    dataTable.addColumn({
      type: 'date',
      id: 'Start'
    });
    dataTable.addColumn({
      type: 'date',
      id: 'End'
    });
    dataTable.addRows([
      ['Washington', 'test', createToolTip(), newDate(1789, 3, 30), newDate(1797, 2, 4)],
      ['Adams', 'test', createToolTip(), newDate(1797, 2, 4), newDate(1801, 2, 4)],
      ['Jefferson', 'test', createToolTip(), newDate(1801, 2, 4), newDate(1809, 2, 4)]
    ]);
    //select-handler
    google.visualization.events.addListener(chart, 'select', function(e) {
      //the built-in tooltipvar tooltip = document.querySelector('.google-visualization-tooltip:not([clone])');
      //remove previous clone when there is anyif (chart.ttclone) {
        chart.ttclone.parentNode.removeChild(chart.ttclone)
      }
      //create a clone of the built-in tooltip
      chart.ttclone = tooltip.cloneNode(true);
      //create a custom attribute to be able to distinguish//built-in tooltip and clone
      chart.ttclone.setAttribute('clone', true);
      //inject clone into document
      chart.ttclone.style.pointerEvents = 'auto';
      tooltip.parentNode.insertBefore(chart.ttclone, chart.tooltip);
    });

    functioncreateToolTip() {
       var mainDiv = '<div style="z-index: 1000;">';
       var list =
            '<ul class="google-visualization-tooltip-action-list">' +
                '<li class="google-visualization-tooltip-action">' +
                    '<span style="font-family: Arial; font-size: 12px; color: rgb(0, 0, 0); margin: 0px; text-decoration: none; font-weight: bold;">' +
                        '<a href="mailto:test@test.com?Subject=test">Contact</a>' +
                    '</span>' +
                '</li>' +
            '</ul>';
       var endMainDiv = '</div>';
       var tooltip = mainDiv + list + endMainDiv;
       return tooltip;
    }

    chart.draw(dataTable, {tooltip: {isHtml: true }});
  },
  packages: ['timeline']
});

.google-visualization-tooltip {
  opacity: 0!important;
  max-width: 200px!important;
}
.google-visualization-tooltip[clone] {
  opacity: 1!important;
}
html,
body,
timeline {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

<scriptsrc="https://www.gstatic.com/charts/loader.js"></script><divid="timeline"style="height:90%"></div>