先来看看效果图
下面直接上源代码，html文件
<html> <head> <meta charset="utf-8"> <title>实时刷新折线图</title> <style> .axis path, .axis line{ fill: none; stroke: black; shape-rendering: crispEdges; } .axis text { font-family: sans-serif; font-size: 11px; } .overlay { fill: none; pointer-events: all; } .tooltip{ width: 150px; height: auto; position: absolute; font-family: simsun; font-size: 16px; line-height: 26px; text-align: left; border: 1px solid black; background-color: white; border-radius: 5px; } .tooltip .title{ border-bottom: 1px solid #000; text-align: center; } .tooltip .desColor{ width: 10px; height: 10px; float: left; margin: 9px 8px 1px 8px; } .tooltip .desText{ display: inline; } .focusLine { stroke: black; stroke-width: 1px; stroke-dasharray: 5,5; } </style> </head> <body><script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> <script src="linechart.js" charset="utf-8"></script> <svg contentScriptType="text/ecmascript" width="2000" xmlns:xlink="http://www.w3.org/1999/xlink" zoomAndPan="magnify" style="background-color:#ffffff;" contentStyleType="text/css" viewBox="0 0 2000.0 2000.0" height="2000" preserveAspectRatio="xMidYMid meet" xmlns="http://www.w3.org/2000/svg" version="1.0"><defs><symbol id="fillgauge1" viewBox="0 0 500.0 300.0" preserveAspectRatio="none meet"></symbol><symbol id="fillgauge2" viewBox="0 0 200.0 200.0" preserveAspectRatio="none meet"></symbol></defs><use x="0" y="0" width="500" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#fillgauge1" xlink:type="simple" xlink:actuate="onLoad" symboltype="17" height="300" xlink:show="embed"/><use x="20" y="20" width="50" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#fillgauge2" xlink:type="simple" xlink:actuate="onLoad" symboltype="17" height="180" xlink:show="embed"/></svg><script> var dataset = [ { country: "china", gdp: [[2000,11920],[2001,13170],[2002,14550], [2003,16500],[2004,19440],[2005,22870], [2006,27930],[2007,35040],[2008,45470], [2009,51050],[2010,59490],[2011,73140], [2012,83860],[2013,103550]] }, { country: "usa", gdp: [[2000,47310],[2001,41590],[2002,39800], [2003,43020],[2004,46550],[2005,45710], [2006,43560],[2007,43560],[2008,48490], [2009,50350],[2010,54950],[2011,59050], [2012,59370],[2013,48980]] }];var gauge1=loadLineChart("fillgauge1",dataset); function NewValue(){ if(Math.random() > .5){ return Math.round(Math.random()*100); } else { return (Math.random()*100).toFixed(1); } } function refreshLine(gauge1){ //alert("hehe"); // document.getElementById("fillgauge1").innerHTML=""; var updateData =[ { country: "china", gdp: [[2000,NewValue()],[2001,NewValue()],[2002,NewValue()], [2003,NewValue()],[2004,NewValue()],[2005,NewValue()], [2006,NewValue()],[2007,NewValue()],[2008,NewValue()], [2009,NewValue()],[2010,NewValue()],[2011,NewValue()], [2012,NewValue()],[2013,NewValue()]] }, { country: "usa", gdp: [[2000,NewValue()],[2001,NewValue()],[2002,NewValue()], [2003,NewValue()],[2004,NewValue()],[2005,NewValue()], [2006,NewValue()],[2007,NewValue()],[2008,NewValue()], [2009,NewValue()],[2010,NewValue()],[2011,NewValue()], [2012,NewValue()],[2013,NewValue()]] } ]; gauge1.update(updateData); }self.setInterval("refreshLine(gauge1)",5000);</script> </body></html>lineChart.js负责加载和刷新折线图
function loadLineChart(elementId, dataset) { var svg = d3.select("#" + elementId); var strs = svg.attr("viewBox").split(" "); alert(dataset); var width = strs[2]; var height = strs[3]; //外边框 var padding = { top : 50, right : 50, bottom : 50, left : 50 }; var names = new Array(); //计算GDP的最大值 var gdpmax = 0; for (var i = 0; i < dataset.length; i++) { var currGdp = d3.max(dataset[i].gdp, function (d) { return d[1]; }); if (currGdp > gdpmax) gdpmax = currGdp; } var gdpnumb = dataset[0].gdp.length; for (var j = 0; j < gdpnumb; j++) { names[j] = (dataset[0].gdp[j])[0]; } alert(names); var xScale = d3.scale.linear() .domain([2000, 2013]) .range([0, width - padding.left - padding.right]); // var xScale = d3.scale.ordinal() // .domain(names) // .rangeRoundBands([0, width - padding.left - padding.right]); var yScale = d3.scale.linear() .domain([0, gdpmax * 1.1]) .range([height - padding.top - padding.bottom, 0]); //创建一个直线生成器 var linePath = d3.svg.line() .x(function (d) { return xScale(d[0]); }) .y(function (d) { return yScale(d[1]); }) .interpolate("basis"); //定义两个颜色 var colors = [d3.rgb(0, 0, 255), d3.rgb(0, 255, 0)]; //添加路径 svg.selectAll("path") //选择<svg>中所有的<path> .data(dataset) //绑定数据 .enter() //选择enter部分 .append("path") //添加足够数量的<path>元素 .attr("transform", "translate(" + padding.left + "," + padding.top + ")") .attr("d", function (d) { return linePath(d.gdp); //返回直线生成器得到的路径 }) .attr("fill", "none") .attr("stroke-width", 3) .attr("stroke", function (d, i) { return colors[i]; }); //添加垂直于x轴的对齐线 var vLine = svg.append("line") .attr("class", "focusLine") .style("display", "none"); //添加一个提示框 var tooltip = d3.select("body") .append("div") .attr("class", "tooltip") .style("opacity", 0.0); var title = tooltip.append("div") .attr("class", "title"); var des = tooltip.selectAll(".des") .data(dataset) .enter() .append("div"); var desColor = des.append("div") .attr("class", "desColor"); var desText = des.append("div") .attr("class", "desText"); //添加一个透明的监视鼠标事件用的矩形 svg.append("rect") .attr("class", "overlay") .attr("x", padding.left) .attr("y", padding.top) .attr("width", width - padding.left - padding.right) .attr("height", height - padding.top - padding.bottom) .on("mouseover", function () { tooltip.style("left", (d3.event.pageX) + "px") .style("top", (d3.event.pageY + 20) + "px") .style("opacity", 1.0); vLine.style("display", null); }) .on("mouseout", function () { tooltip.style("opacity", 0.0); vLine.style("display", "none"); }) .on("mousemove", mousemove); function mousemove() { /* 当鼠标在透明矩形内滑动时调用 */ //折线的源数组 var data = dataset[0].gdp; //获取鼠标相对于透明矩形左上角的坐标，左上角坐标为(0,0) var mouseX = d3.mouse(this)[0] - padding.left; var mouseY = d3.mouse(this)[1] - padding.top; //通过比例尺的反函数计算原数据中的值，例如x0为某个年份，y0为GDP值 var x0 = xScale.invert(mouseX); var y0 = yScale.invert(mouseY); //对x0四舍五入，如果x0是2005.6，则返回2006；如果是2005.2，则返回2005 x0 = Math.round(x0); //查找在原数组中x0的值，并返回索引号 var bisect = d3.bisector(function (d) { return d[0]; }).left; var index = bisect(data, x0); //获取年份和gdp数据 var year = x0; var gdp = []; for (var k = 0; k < dataset.length; k++) { gdp[k] = { country : dataset[k].country, value : dataset[k].gdp[index][1] }; } //设置提示框的标题文字（年份） title.html("<strong>" + year + "年</strong>"); //设置颜色标记的颜色 desColor.style("background-color", function (d, i) { return colors[i]; }); //设置描述文字的内容 desText.html(function (d, i) { return gdp[i].country + "/t" + "<strong>" + gdp[i].value + "</strong>"; }); //设置提示框的位置 tooltip.style("left", (d3.event.pageX) + "px") .style("top", (d3.event.pageY + 20) + "px"); //获取垂直对齐线的x坐标 var vlx = xScale(data[index][0]) + padding.left; //设定垂直对齐线的起点和终点 vLine.attr("x1", vlx) .attr("y1", padding.top) .attr("x2", vlx) .attr("y2", height - padding.bottom); } var markStep = 80; var gMark = svg.selectAll(".gMark") .data(dataset) .enter() .append("g") .attr("transform", function (d, i) { return "translate(" + (padding.left + i * markStep) + "," + (height - padding.bottom + 40) + ")"; }); gMark.append("rect") .attr("x", 0) .attr("y", 0) .attr("width", 10) .attr("height", 10) .attr("fill", function (d, i) { return colors[i]; }); gMark.append("text") .attr("dx", 15) .attr("dy", ".5em") .attr("fill", "black") .text(function (d) { return d.country; }); //x轴 var xAxis = d3.svg.axis() .scale(xScale) .ticks(5) .tickFormat(d3.format("d")) .orient("bottom"); //y轴 var yAxis = d3.svg.axis() .scale(yScale) .orient("left"); svg.append("g") .attr("class", "axis") .attr("transform", "translate(" + padding.left + "," + (height - padding.bottom) + ")") .call(xAxis); svg.append("g") .attr("class", "y axis") .attr("transform", "translate(" + padding.left + "," + padding.top + ")") .call(yAxis); function updateLineChart() { this.update = function (updateData) { //xScale.domain(updateData,function(d){return d.name}); var numValues = updateData.length; var updategdpmax = 0; for (var i = 0; i < updateData.length; i++) { var currGdp = d3.max(updateData[i].gdp, function (d) { return d[1]; }); if (currGdp > updategdpmax) updategdpmax = currGdp; } yScale = d3.scale.linear() .domain([0, updategdpmax * 1.1]) .range([height - padding.top - padding.bottom, 0]); yAxis = d3.svg.axis() .scale(yScale) .orient("left"); svg.selectAll("g.y.axis") .call(yAxis); svg.selectAll("path") //选择<svg>中所有的<path> .data(updateData) //绑定数据 .transition() .duration(2000) .ease("linear") .attr("d", function (d) { return linePath(d.gdp); //返回直线生成器得到的路径 }); } } return new updateLineChart();}刚开始数据刷新了但是坐标轴木有刷新
引入
svg.selectAll("g.y.axis") .call(yAxis);以上就是d3.js实现实时刷新折线图的全部内容，希望给大家学习d3.js带来帮助。
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