Sparkline pie chart from object. the tooltips are the object keys and the values are the object value for each key.

pieChartFromObject.js

function pieChartFromObject(data, options, className) {
    var labels = [], total = 0,
    values = $.map(data, function(value, label) { total += value; labels.push(label); return value; });
    var chart = $('<span class="'+className+'">&nbsp;</span>');
    
    options.type = 'pie';
    options.tooltipFormat = '<span style="color: {{color}}">&#9679;</span> {{offset:labels}} - {{value}} ({{percent.1}}%)';
    options.tooltipValueLookups = { labels: labels}  ;

    if (total == 0) {
    	// show an empty pie if the data is invalid
    	labels = [""];
    	values = [1];
    	options.sliceColors = ["#aaa"];
	    options.tooltipFormat = 'No data';
    }

    chart.sparkline(values, options );

    return chart;
}