Question

我修改了一些d3过滤块，意图按年过滤（理想情况下是通过滑块而不是每年都有一个按钮），但遇到了两个问题：

在调用filter（）和exit（）时，remove（）没有任何反应
这些年我怎么能添加滑块或自动播放？我查看了一些例子，但对于初学者来说它们有点复杂。

    <!DOCTYPE html>
    <html lang="en">
    	<head>
          <script src="https://d3js.org/d3.v4.min.js"></script>
    		<meta charset="utf-8">
    		<title>D3: Loading data from a CSV file</title>
      </head>
    	<body>
        <p class="s12"> select 2012 </p>
        <p class="s16"> select 2016 </p>
    		<script type="text/javascript">
    
          var margin = {top: 20, right: 20, bottom: 30, left: 40},
        		w = 600 - margin.left - margin.right,
        		h = 300 - margin.top - margin.bottom;
          var padding = 40;
          
          var data = [{
          "Food": "Apples",
          "Deliciousness": 9,
          "year": 2010
        }, {
          "Food": "Green Beans",
          "Deliciousness": 5,
          "year": 2012
        }, {
          "Food": "Egg Salad Sandwich",
          "Deliciousness": 4,
          "year": 2016
        }, {
          "Food": "Cookies",
          "Deliciousness": 10,
          "year": 2018
        } ];
    
            // format the data
            data.forEach(function(d) {
              d.Deliciousness = +d.Deliciousness;
            });
            
            
          var svg = d3.select("body")
    						.append("svg")
    						.attr("width", w + margin.left + margin.right)
    						.attr("height", h + margin.top + margin.bottom)
          			.append("g")
          			.attr("transform", "translate(" + margin.left+"," +
                     margin.top+")");
            
          var xScale = d3.scaleBand()
          	.domain(d=>d.Food)
          	.range([margin.left,w+margin.left])
          	.paddingInner(0.2);
         xScale.domain(data.map(function(d) { return d.Food; }));
    
            
          var xAxis = d3.axisBottom()
          	.scale(xScale)
          	.ticks(5);
          
          var yScale = d3.scaleLinear()
          	.domain([0, d3.max(data, d=>d.Deliciousness)])
          	.rangeRound([h+margin.top,margin.top]);
            
          var yAxis = d3.axisLeft()
          	.scale(yScale)
          	.ticks(5);
          
          svg.selectAll('rect')
            .data(data)
            .enter()
            .append('rect')
            .attr('x',(d,i) => margin.left + i*w/data.length)
            .attr('y',d=>yScale(d.Deliciousness))
            .attr('width', xScale.bandwidth())
            .attr('height',d =>h-yScale(d.Deliciousness))
            .attr('fill',function(d){
              if (d===30) return "red";
              return "rgb(0,0,"+d.Deliciousness*10+")" ;});
            
          
          svg.append("g")
          	.attr("class", "axis")
    	   		.attr("transform", "translate(" + padding + ",0)")
          	.call(yAxis);
            
    			svg.append("g")
          	.attr("class", "axis")
    	   		.attr("transform", "translate(0," + h + ")")
          	.call(xAxis);
           
          d3.select(".s12")
  				.on("click", function() {
      svg.selectAll("rect")
      .filter(function(d) {
        return d.year !== 2012;
      })
      .remove();
        
       d3.select(".s16")
    			.on("click", function() {
       svg.selectAll("rect")
        .filter(function(d) {
          return d.year !== 2016;
        })
        .remove();  
         });
            
        
    		</script>
    	</body>
    </html>

代码已更新

Answer 1

首先，修复comments section中解释的类问题。

这里你的问题是这个块的逻辑：

svg.selectAll("rect")
    .data(data.filter(function(d) {
        return d.year == 2012;
    }))
    .exit().remove();

这没有多大意义：你正在做的是按年（2012）过滤数据数组，这将只返回 1 对象。然后，您选择所有矩形，仅使用一个对象绑定一个新数据数组（这将保留所有其他矩形，没有任何数据），然后在退出选择上调用remove。那不对。

由于您没有新数据，只需过滤选择：

svg.selectAll("rect")
    .filter(function(d) {
        return d.year !== 2012;
    })
    .remove();

这样，您只需删除不代表2012的矩形。

这是更新的代码：

var margin = {
    top: 20,
    right: 20,
    bottom: 30,
    left: 40
  },
  w = 600 - margin.left - margin.right,
  h = 300 - margin.top - margin.bottom;
var padding = 40;

var data = [{
  "Food": "Apples",
  "Deliciousness": 9,
  "year": 2010
}, {
  "Food": "Green Beans",
  "Deliciousness": 5,
  "year": 2012
}, {
  "Food": "Egg Salad Sandwich",
  "Deliciousness": 4,
  "year": 2016
}, {
  "Food": "Cookies",
  "Deliciousness": 10,
  "year": 2018
}];

// format the data
data.forEach(function(d) {
  d.Deliciousness = +d.Deliciousness;
});


var svg = d3.select("body")
  .append("svg")
  .attr("width", w + margin.left + margin.right)
  .attr("height", h + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," +
    margin.top + ")");

var xScale = d3.scaleBand()
  .domain(d => d.Food)
  .range([margin.left, w + margin.left])
  .paddingInner(0.2);
xScale.domain(data.map(function(d) {
  return d.Food;
}));


var xAxis = d3.axisBottom()
  .scale(xScale)
  .ticks(5);

var yScale = d3.scaleLinear()
  .domain([0, d3.max(data, d => d.Deliciousness)])
  .rangeRound([h + margin.top, margin.top]);

var yAxis = d3.axisLeft()
  .scale(yScale)
  .ticks(5);

svg.selectAll('rect')
  .data(data)
  .enter()
  .append('rect')
  .attr('x', (d, i) => margin.left + i * w / data.length)
  .attr('y', d => yScale(d.Deliciousness))
  .attr('width', xScale.bandwidth())
  .attr('height', d => h - yScale(d.Deliciousness))
  .attr('fill', function(d) {
    if (d === 30) return "red";
    return "rgb(0,0," + d.Deliciousness * 10 + ")";
  });


svg.append("g")
  .attr("class", "axis")
  .attr("transform", "translate(" + padding + ",0)")
  .call(yAxis);

svg.append("g")
  .attr("class", "axis")
  .attr("transform", "translate(0," + h + ")")
  .call(xAxis);

d3.select(".s12")
  .on("click", function() {
    svg.selectAll("rect")
      .filter(function(d) {
        return d.year !== 2012;
      })
      .remove();
  });

<script src="https://d3js.org/d3.v4.min.js"></script>
<p class="s12"> select 2012 </p>
<p class="s16"> select 2016 </p>

如何过滤元素并隐藏其他元素？

1 个答案: