d3.js实现双击删除节点并删除节点上的文字

迷南。 2022-05-19 08:18 246阅读 0赞

最近项目遇到一个问题：删除节点，节点上的文字却无法删除。

经过F12的调试，我发现原来自己写的节点、连线、文字分别包裹在不同的g标签内。

于是出现了两种解决方案：

（1）把文字依附在节点上

（2）选中节点的时候遍历文字确保是哪个文字和该节点是对应的

我个人认为第一种方案是最优化的，我也推荐大家遇到这个问题采用第一种方案。

但是我项目之前写的结构就这样了，如果现在改的话，需要改的代码太多，于是我采用第二种方案。

废话之后，干货奉上

以下是我写的一个demo:

<!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="UTF-8">
    		<title>双击删除节点</title>
    		<script src="http://d3js.org/d3.v3.min.js"></script>  
    	</head>
    	<body>
    		<script>
    			var width = 1366;
    			var height = 768;
    			var img_w = 77;
    			var img_h = 80;
            	var radius = 30;
    			var svg = d3.select("body")
    						.append("svg")
    						.attr("width",width)
    						.attr("height",height);
       			d3.json("json/song.json",function(error,data){
       				if(error){
       					return console.log(error);
       				}
       			var dataset = data;
       			console.log(dataset);
       			
       			var force = d3.layout.force()
       						  .nodes(dataset.nodes)
       						  .links(dataset.links)
       						  .size([width,height])
       						  .linkDistance(100)
       						  .charge(-1500)
       						  .start();
       						  
       			var links = svg.selectAll("line")
       						   .data(dataset.links)
       						   .enter()
       						   .append("line")
       						   .attr("class","lines")
       						   .attr("style","stroke: #CCCCCC; stroke-width: 2;");
    
    			var nodes = svg.selectAll("circle")
    						   .data(dataset.nodes)
    						   .enter()
    						   .append("circle")
    						   .attr("r",radius)
    						   .attr("class","nodes")
    						   .attr("fill","pink")
    						   .on("dblclick",function(d){
    						   		//双击节点删除，获取选中节点的在json中的name的值
    						   		d3.select(this).remove();
    						   		var clickNodeName = d.name;//点击节点的名字
    						   		d3.selectAll(".nodetext").each(function(d,i){
    						   			var temp = d.name;
    						   			if(temp==clickNodeName){
    //						   				alert("相等");
    						   				d3.select(this).remove();
    						   			}
    						   		});
    						   		d3.selectAll(".lines").each(function(e){
    						   			if(e.source===d||e.target===d){
    						   				d3.select(this).remove();
    						   			}
    						   		})
    						   })
                           	   .on("mouseout",function(d,i){
                           			nodes.style("stroke",function(edge){
                           				if(edge.source===d){
                           					return "#CCCCCC";
                           				}
                           			});
                                    links.style("stroke","#CCCCCC");
    	                       })
    						   .call(force.drag);
    					   
    			var text_dx = -20;
    			var text_dy = 20;
    			console.log("x："+text_dx);
    			console.log("y:"+text_dy);
    			
    			var nodes_text = svg.selectAll(".nodetext")
    							.data(dataset.nodes)
    							.enter()
    							.append("text")
    							.attr("class","nodetext")
    							.attr("dy",".35em")
    							.attr("text-anchor","middle")
    						    .text(function(d) { return d.name; });
    			force.on("tick", function() {  
    				
    				links.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; });
    				
    				nodes.attr("cx", function(d) { return d.x; })  
    				     .attr("cy", function(d) { return d.y; });  
    				
    				nodes_text.attr("dx", function(d) { return d.x-img_w/4; })
    				     	 .attr("dy", function(d) { return d.y+5; }); 
    			});  
       		});
    		</script>
    	</body>
    </html>

json文件如下：

{
       				"nodes":[
       						 {"name":"人物1","group":3,"img":"img/1.jpg"},
       						 {"name":"人物2","group":3,"img":"img/2.jpg"},  
    						 {"name":"人物3","group":3,"img":"img/3.jpg"},  
    						 {"name":"人物4","group":3,"img":"img/4.jpg"},
    						 {"name":"人物5","group":3,"img":"img/5.jpg"},
    						 {"name":"人物6","group":2,"img":"img/6.jpg"},  
       						 {"name":"人物7","group":2,"img":"img/7.jpg"},  
    						 {"name":"人物8","group":2,"img":"img/8.jpg"},  
    						 {"name":"人物9","group":2,"img":"img/9.jpg"},
    						 {"name":"人物10","group":2,"img":"img/10.jpg"},
    						 {"name":"人物11","group":1,"img":"img/11.jpg"},
    						 {"name":"人物12","group":1,"img":"img/12.jpg"},
    						 {"name":"人物13","group":1,"img":"img/13.jpg"},
    						 {"name":"人物14","group":1,"img":"img/14.jpg"},
    						 {"name":"人物15","group":1,"img":"img/15.jpg"},
    						 {"name":"人物16","group":1,"img":"img/16.jpg"}],
       				"links":[{"source":0,"target":1,"relation":"\ue900 \ue904 \ue908 \ue9a1"},  
    				         {"source":0,"target":2,"relation":"关系一"},
    				         {"source":0,"target":3,"relation":"关系二"},
    				         {"source":0,"target":4,"relation":"\ue909"},
    				         {"source":5,"target":6,"relation":"\ue9a1"},  
    				         {"source":5,"target":7,"relation":"\ue9a2"},
    				         {"source":5,"target":8,"relation":"\ue9a3"},
    				         {"source":5,"target":9,"relation":"\ue9ad"}, 
    				         {"source":10,"target":11,"relation":"\ue9c1"},
    				         {"source":10,"target":12,"relation":"\ue9c3"},
    				         {"source":10,"target":13,"relation":"\ue9dd"},
    				         {"source":10,"target":14,"relation":"\ue9fd"},
    				         {"source":10,"target":15,"relation":"\ue9ed"},
    				         {"source":10,"target":11,"relation":"\ue91d"},
    				         {"source":0,"target":5,"relation":"\ue93d"},
    				         {"source":5,"target":10,"relation":"\ue95d"},
    				         {"source":10,"target":0,"relation":"\ue97d"}
    				       ] 
       			}

测试效果如下：

![70][]

[70]: /images/20220519/d07d7eb323da4418a6b48b2bd02ab921.png