Insert Links into Google Charts api data?

Question

I have been playing around with Google charts quite a bit over in the google charts play ground here:

Link

The code I have been playing with is this:

Answer 1

Here's another solution that wraps each text tag for label with anchor tag.

• no ForeignObject
• clickable label
• stylable by css (hover effect)

Here's a sample: https://jsfiddle.net/tokkonoPapa/h3eq9m9p/

/* find the value in array */
function inArray(val, arr) {
    var i, n = arr.length;
    val = val.replace('…', ''); // remove ellipsis
    for (i = 0; i < n; ++i) {
        if (i in arr && 0 === arr[i].label.indexOf(val)) {
            return i;
        }
    }
    return -1;
}

/* add a link to each label */
function addLink(data, id) {
    var n, p, info = [], ns = 'hxxp://www.w3.org/1999/xlink';

    // make an array for label and link.
    n = data.getNumberOfRows();
    for (i = 0; i < n; ++i) {
        info.push({
            label: data.getValue(i, 0),
            link:  data.getValue(i, 2)
        });
    }

    $('#' + id).find('text').each(function(i, elm) {
        p = elm.parentNode;
        if ('g' === p.tagName.toLowerCase()) {
            i = inArray(elm.textContent, info);
            if (-1 !== i) {
                /* wrap text tag with anchor tag */
                n = document.createElementNS('hxxp://www.w3.org/2000/svg', 'a');
                n.setAttributeNS(ns, 'xlink:href', info[i].link);
                n.setAttributeNS(ns, 'title', info[i].label);
                n.setAttribute('target', '_blank');
                n.setAttribute('class', 'city-name');
                n.appendChild(p.removeChild(elm));
                p.appendChild(n);
                info.splice(i, 1); // for speeding up
            }
        }
    });
}

function drawBasic() {
    var data = google.visualization.arrayToDataTable([
        ['City', '2010 Population', {role: 'link'}],
        ['New York City, NY', 8175000, 'hxxp://google.com/'],
        ['Los Angeles, CA',   3792000, 'hxxp://yahoo.com/' ],
        ['Chicago, IL',       2695000, 'hxxp://bing.com/'  ],
        ['Houston, TX',       2099000, 'hxxp://example.com'],
        ['Philadelphia, PA',  1526000, 'hxxp://example.com']
    ]);

    var options = {...};
    var chart = new google.visualization.BarChart(
        document.getElementById('chart_div')
    );

    chart.draw(data, options);

    addLink(data, 'chart_div');
}