d3.js是一个非常不错的数据可视化库，我们可以用它来做一些比较酷的东西，比如可以来显示一些简单的网络拓扑，如下面的效果(用非IE浏览器可以看到效果)：
代码有点长，但是也不复杂，可以参考如下代码：
<!DOCTYPE html> <html> <head> <script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js?2.9.1"></script> <style type="text/css"> .link { stroke: green; stroke-linejoin:bevel;} .link_error{ stroke:red; stroke-linejoin:bevel; } .nodetext { font: 12px sans-serif; -webkit-user-select:none;
-moze-user-select:none; stroke-linejoin:bevel; } #container{ width:800px; height:600px; border:1px solid gray; border-radius:5px; position:relative; margin:20px; } </style> </head> <body> <div id='container'></div> <script type="text/javascript"> function Topology(ele){ typeof(ele)=='string' && (ele=document.getElementById(ele)); var w=ele.clientWidth, h=ele.clientHeight, self=this; this.force = d3.layout.force().gravity(.05).distance(200).charge(-800).size([w, h]); this.nodes=this.force.nodes(); this.links=this.force.links(); this.clickFn=function(){}; this.vis = d3.select(ele).append("svg:svg") .attr("width", w).attr("height", h).attr("pointer-events", "all"); this.force.on("tick", function(x) { self.vis.selectAll("g.node") .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); self.vis.selectAll("line.link") .attr("x1", function(d) { return d.source.x; }) .attr("y1", function(d) { return d.source.y; }) .attr("x2", function(d) { return d.target.x; }) .attr("y2", function(d) { return d.target.y; }); }); } Topology.prototype.doZoom=function(){ d3.select(this).select('g').attr("transform","translate(" + d3.event.translate + ")"+ " scale(" + d3.event.scale + ")"); } //增加节点 Topology.prototype.addNode=function(node){ this.nodes.push(node); } Topology.prototype.addNodes=function(nodes){ if (Object.prototype.toString.call(nodes)=='[object Array]' ){ var self=this; nodes.forEach(function(node){ self.addNode(node); }); } } //增加连线 Topology.prototype.addLink=function(source,target){ this.links.push({source:this.findNode(source),target:this.findNode(target)}); } //增加多个连线 Topology.prototype.addLinks=function(links){ if (Object.prototype.toString.call(links)=='[object Array]' ){ var self=this; links.forEach(function(link){ self.addLink(link['source'],link['target']); }); } } //删除节点 Topology.prototype.removeNode=function(id){ var i=0, n=this.findNode(id), links=this.links; while ( i < links.length){ links[i]['source']==n || links[i]['target'] ==n ? links.splice(i,1) : ++i; } this.nodes.splice(this.findNodeIndex(id),1); } //删除节点下的子节点，同时清除link信息 Topology.prototype.removeChildNodes=function(id){ var node=this.findNode(id), nodes=this.nodes; links=this.links, self=this; var linksToDelete=[], childNodes=[]; links.forEach(function(link,index){ link['source']==node && linksToDelete.push(index) && childNodes.push(link['target']); }); linksToDelete.reverse().forEach(function(index){ links.splice(index,1); }); var remove=function(node){ var length=links.length; for(var i=length-1;i>=0;i--){ if (links[i]['source'] == node ){ var target=links[i]['target']; links.splice(i,1); nodes.splice(self.findNodeIndex(node.id),1); remove(target); } } } childNodes.forEach(function(node){ remove(node); }); //清除没有连线的节点 for(var i=nodes.length-1;i>=0;i--){ var haveFoundNode=false; for(var j=0,l=links.length;j<l;j++){ ( links[j]['source']==nodes[i] || links[j]['target']==nodes[i] ) && (haveFoundNode=true) } !haveFoundNode && nodes.splice(i,1); } } //查找节点 Topology.prototype.findNode=function(id){ var nodes=this.nodes; for (var i in nodes){ if (nodes[i]['id']==id ) return nodes[i]; } return null; } //查找节点所在索引号 Topology.prototype.findNodeIndex=function(id){ var nodes=this.nodes; for (var i in nodes){ if (nodes[i]['id']==id ) return i; } return -1; } //节点点击事件 Topology.prototype.setNodeClickFn=function(callback){ this.clickFn=callback; } //更新拓扑图状态信息 Topology.prototype.update=function(){ var link = this.vis.selectAll("line.link") .data(this.links, function(d) { return d.source.id + "-" + d.target.id; }) .attr("class", function(d){ return d['source']['status'] && d['target']['status'] ? 'link' :'link link_error'; }); link.enter().insert("svg:line", "g.node") .attr("class", function(d){ return d['source']['status'] && d['target']['status'] ? 'link' :'link link_error'; }); link.exit().remove(); var node = this.vis.selectAll("g.node") .data(this.nodes, function(d) { return d.id;}); var nodeEnter = node.enter().append("svg:g") .attr("class", "node") .call(this.force.drag); //增加图片，可以根据需要来修改 var self=this; nodeEnter.append("svg:image") .attr("class", "circle") .attr("xlink:href", function(d){ //根据类型来使用图片 return d.expand ? "http://ww2.sinaimg.cn/large/412e82dbjw1dsbny7igx2j.jpg" : "http://ww4.sinaimg.cn/large/412e82dbjw1dsbnxezrrpj.jpg"; }) .attr("x", "-32px") .attr("y", "-32px") .attr("width", "64px") .attr("height", "64px") .on('click',function(d){ d.expand && self.clickFn(d);}) nodeEnter.append("svg:text") .attr("class", "nodetext") .attr("dx", 15) .attr("dy", -35) .text(function(d) { return d.id }); node.exit().remove(); this.force.start(); } var topology=new Topology('container'); var nodes=[ {id:'10.4.42.1',type:'router',status:1}, {id:'10.4.43.1',type:'switch',status:1,expand:true}, {id:'10.4.44.1',type:'switch',status:1}, {id:'10.4.45.1',type:'switch',status:0} ]; var childNodes=[ {id:'10.4.43.2',type:'switch',status:1}, {id:'10.4.43.3',type:'switch',status:1} ]; var links=[ {source:'10.4.42.1',target:'10.4.43.1'}, {source:'10.4.42.1',target:'10.4.44.1'}, {source:'10.4.42.1',target:'10.4.45.1'} ]; var childLinks=[ {source:'10.4.43.1',target:'10.4.43.2'}, {source:'10.4.43.1',target:'10.4.43.3'}, {source:'10.4.43.2',target:'10.4.43.3'} ] topology.addNodes(nodes); topology.addLinks(links); //可展开节点的点击事件 topology.setNodeClickFn(function(node){ if(!node['_expanded']){ expandNode(node.id); node['_expanded']=true; }else{ collapseNode(node.id); node['_expanded']=false; } }); topology.update(); function expandNode(id){ topology.addNodes(childNodes); topology.addLinks(childLinks); topology.update(); } function collapseNode(id){ topology.removeChildNodes(id); topology.update(); } </script> </body> </html>
