javascript - Zoom Google Line chart

Question

I am trying to create a line chart with the Google Visualization API. I want to enable zooming. Documents say that the 'explorer' option is useful. But when I try to use the 'explorer' option, the chart is shown but zoom does not work.

This is my code:

function drawVisualization(dataValues) {
var data = new window.google.visualization.DataTable();
data.addColumn('date', 'Date');
data.addColumn('number', 'Count');

for (var i = 0; i < dataValues.length; i++) {
    data.addRow([new Date(dataValues[i].Year, dataValues[i].Month-1, dataValues[i].Day), dataValues[i].Count]);
}

var formatter_short = new google.visualization.DateFormat({ formatType: 'short' });
formatter_short.format(data, 0);
var options = {
    title: "Time statistics",
    explorer: { maxZoomOut: 8 }
};
var chart = new google.visualization.LineChart(document.getElementById('date'));
chart.draw(data, options);
}

How can I resolve this problem and make a line chart zoomable?

Answer 1

Here is How I got the zoom with the dragToZoom explorer function

explorer: { 
        actions: ['dragToZoom', 'rightClickToReset'],
        axis: 'horizontal',
        keepInBounds: true,
        maxZoomIn: 4.0
}

the fiddle is here https://jsfiddle.net/4w626v2s/2/

also by just allowing it to zoom by scrolling

explorer: {
        axis: 'horizontal',
        keepInBounds: true,
        maxZoomIn: 4.0
}

the fiddle for scroll to zoom is here https://jsfiddle.net/5h7jxqq8/2/