d3过滤

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>过滤</title>
 6     <script src="d3.js"></script>
 7 </head>
 8 <style>
 9 .h-bar {
10     min-height: 15px;
11     min-width: 10px;
12     background-color: steelblue;
13     margin-bottom: 2px;
14     font-size: 11px;
15     color: #f0f8ff;
16     text-align: right;
17     padding-right: 2px;
18 }
19 .selected{
20     background-color: pink;
21 }
22 </style>
23 
24 <body>
25     <script>
26       // 定义数据
27       let data = [
28         { expense: 10, category: "Retail" },
29         { expense: 15, category: "Gas" },
30         { expense: 30, category: "Retail" },
31         { expense: 50, category: "Dining" },
32         { expense: 80, category: "Gas" },
33         { expense: 65, category: "Retail" },
34         { expense: 55, category: "Gas" },
35         { expense: 30, category: "Dining" },
36         { expense: 20, category: "Retail" },
37         { expense: 10, category: "Dining" },
38         { expense: 8, category: "Gas" }
39       ]
40       function render(data, category) {
41         // 进入
42         d3.select("body").selectAll('div.h-bar')
43           .data(data)
44           .enter()
45           .append("div")
46           .attr('class', 'h-bar')
47           .append('span')
48         // 退出
49         d3.select("body").selectAll('div.h-bar')
50           .data(data)
51           .exit()
52           .remove()
53         // 更新
54         d3.select("body").selectAll('div.h-bar')
55           .data(data)
56           .attr("class", "h-bar")  //为了初始化下样式
57           .style('width', function(d) {
58             return (d.expense*5) + 'px'
59           })
60           .select("span")
61           .text(function(d) {
62               return d.category;
63           });
64         
65         d3.select("body").selectAll('div.h-bar')
66           .filter(function(d, i) {
67             return d.category == category
68           })
69           .classed("selected", true)
70       }
71 
72       render(data);
73       function select(category){
74         render(data, category);
75       }
76     </script>
77     <div>
78         <button onclick="select('Retail')">Retail</button>
79         <button onclick="select('Gas')">Gas</button>
80         <button onclick="select('Dining')">Dining</button>
81         <button onclick="select()">Clear</button>
82     </div>
83 </body>
84 
85 </html>