javascript - Update data in simple D3.js doughnut chart with animation -

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i playing around simple d3.js chart. updated removing svg group , create new chart. want change update paths after new data come without removing svg. however, not updating , have no idea doing wrong. fiddle

js

var update_counter = 0; function drawchart() {     var pie_d = 185,         r = pie_d / 2,         piedata = [1, math.random() * 10],         pie = d3.layout.pie(),         arc = d3.svg.arc().innerradius(60).outerradius(r);      update_counter++;     if (!document.queryselectorall('.svg svg').length) {         d3.select('.svg').append('svg:svg')             .data([piedata])             .attr('width', pie_d)             .attr('height', pie_d);     } else {         d3.select('.svg svg')             .data([piedata]);     }     var arcs = d3.select('.svg svg').selectall('g')         .data(pie)         .enter().append('svg:g')         .attr('transform', 'translate(' + r + ',' + r + ')');      arcs.append('svg:path')         .attr('d', arc)         .attr('class', function (d, i) {             return === 0 ? 'onl' : 'ter'         });     d3.select('.counter').text(update_counter); } drawchart(); setinterval(function () {     drawchart() }, 5000);

udpate

nearly there still animation 'jump' fiddle


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