我完全是 D3 的初学者,并已开始绘制从 API 中检索到的一些数据,例如:
chartData = [
{ track: "A Kind of Magic",playcount: 2683110 },{ track: "Another One Bites the Dust",playcount: 6425611 },{ track: "Bohemian Rhapsody",playcount: 10167011 },{ track: "Crazy Little Thing Called Love",playcount: 4360128},{ track: "Don't Stop Me Now",playcount: 7762976 },{ track: "flash",playcount: 1248561 }];
根据一些在线示例,我呈现了条形图:
var margin = {
top: 50,right: 40,bottom: 80,left: 100
},width = 1200 - margin.left - margin.right,height = 500 - margin.top - margin.bottom;
var svg = d3.select('#queenChart')
.attr('width',width + margin.left + margin.right)
.attr('height',height + margin.top + margin.bottom)
.append('g').attr('transform',`translate(${margin.left},${margin.top})`);
var x = d3.scaleBand()
.domain(chartData.map(d => d.track))
.range([0,width])
.padding(0.1);
svg.append('g')
.attr('transform',`translate(0,${height})`)
.call(d3.axisBottom(x))
.selectAll('text')
.attr('transform','translate(-10,0) rotate(-45)')
.style('text-anchor','end');
var y = d3.scaleLinear()
.domain([0,d3.max(chartData,d => { return d.playcount; })])
.range([height,0]);
svg.append('g')
.call(d3.axisLeft(y));
svg.selectAll('rect')
.data(chartData)
.enter()
.append('rect')
.style('fill','steelblue')
.attr('x',d => x(d.track))
.attr('y',d => y(d.playcount))
.attr('height',d => { return height - y(d.playcount); })
.attr('width',x.bandwidth );
当我尝试对图表进行排序时出现问题:
setTimeout(() => {
svg.selectAll('rect')
.sort((a,b) => d3.ascending(a.playcount,b.playcount))
.transition()
.duration(500)
.attr('x',d => x(d.track));
},2500);
2.5 秒后,我可以看到 DOM 中的所有 <rect>
元素确实已正确排序,但图表 svg 本身完全没有变化。是否有什么我遗漏的东西可以让图表重新渲染以反映 DOM 中的变化?