Load only if div is within viewport about easy-pie-chart HOT 1 CLOSED

$(function(){
    var $chart = $('.chart');
    $chart.one('emerged.emerge', function(event) {
        // initialize the plugin the first time it enters the viewport 
        $chart.easyPieChart({ /* your options */ });
    }).emerge({
        interval:   20,     // default
        threshold:  'auto', // default
        recur:      true,   // default
        auto:       0.5,    // default (meaning 0.5 * screen width/height threshold)
        visibility: true    // default
    });
});