vizkit.js is an opinionated little charting library built on top of the amazing and wonderful d3.js visualization framework.
var i = 6;
setInterval(function() {
d3.select('.viz svg').remove();
data[0].push({"key": "foobar", "xValue": i, "yValue": Math.floor((Math.random()*10)+1)});
DrawViz(d3.select('.viz'));
i++;
}, 1000);