我已经基于this example创建了一个D3热图，并为其编写了更新函数。以下是基础热图的相关代码：
<!DOCTYPE html>
<html lange = "en">
<head>
<meta charset="UTF-8">
<title>Heatmap</title>
<script type ="text/javascript" src="d3/d3.v3.js"></script>
<script type ="text/javascript" src="updateHeatmap.js"> </script>
<style type ="text/css">
.btn {
display: inline;
}
rect.bordered {
stroke: #E6E6E6;
stroke-width:2px;
}
text.mono {
font-size: 9pt;
font-family: Consolas, courier;
fill: #aaa;
}
text.axis-workweek {
fill: #000;
}
text.axis-worktime {
fill: #000;
}</style>
</head>
<body>
<div id="n1" class="btn">
<input name="updateButton"
type="button"
value="1"
/>
</div>
<div id="n2" class="btn">
<input name="updateButton"
type="button"
value="2"
/>
</div>
<div id="chart"></div>
<script type="text/javascript">
var margin = {top:50, right:0, bottom:100, left:30},
width=960-margin.left-margin.right,
height=430-margin.top-margin.bottom,
gridSize=Math.floor(width/24),
legendElementWidth=gridSize*2.665,
buckets = 10,
colors = ["#f7fcf0","#e0f3db","#ccebc5","#a8ddb5","#7bccc4","#4eb3d3","#2b8cbe","#0868ac","#084081"],
days = ["Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
times = ["12am", "1am", "2am", "3am", "4am", "5am", "6am", "7am", "8am", "9am", "10am", "11am", "12am", "1pm", "2pm", "3pm", "4pm", "5pm", "6pm", "7pm", "8pm", "9pm", "10pm", "11pm"];
var heatmap;
var legend;
var svg = d3.select("#chart").append("svg")
.attr("width",width + margin.left+margin.right)
.attr("height", height+margin.top+margin.bottom)
.append("g")
.attr("transform", "translate("+ margin.left+","+margin.top+")");
d3.csv("1.csv", function(d){
return {
day:+d.day2,
hour:+d.hour,
value:+d.per_day_per_hour
};
},
function(error, data){
console.log(data);
var colorScale = d3.scale.quantile()
.domain([0, (d3.max(data, function(d){return d.value;})/2), d3.max(data, function(d){return d.value;})])
.range(colors);
var dayLabels = svg.selectAll(".dayLabel")
.data(days)
.enter().append("text")
.text(function (d) {return d; })
.attr("y", function (d, i){ return i*gridSize;})
.style("text-anchor", "end")
.attr("transform", "translate(-6," + gridSize/1.5+")")
.attr("class", function(d, i) { return ((i>=0 && i<=4) ? "dayLabel mono axis axis-workweek": "dayLabel mono axis"); });
var timeLabels = svg.selectAll(".timeLabel")
.data(times)
.enter().append("text")
.text(function(d){return d;})
.attr("x", function(d,i) {return i * gridSize;})
.attr("y",0)
.style("text-anchor", "middle")
.attr("transform", "translate(" + gridSize/2+", -6)")
.attr("class", function(d, i) { return ((i>=9 && i<= 17) ? "timeLabel mono axis axis-worktime": "timeLabel mono axis"); });
var heatMap = svg.selectAll(".hour")
.data(data)
.enter().append("rect")
.attr("x", function(d) {return (d.hour) * gridSize;})
.attr("y", function(d) {return (d.day) * gridSize;})
.attr("rx", 4)
.attr("ry", 4)
.attr("class", "hour bordered")
.attr("width", gridSize)
.attr("height", gridSize)
.style("fill", colors[0]);
heatMap.transition().duration(1000)
.style("fill", function(d){ return colorScale(d.value);});
heatMap.append("title").text(function(d) {return d.value;});
var legend = svg.selectAll(".legend")
.data([0].concat(colorScale.quantiles()), function(d) {return d;})
.enter().append("g")
.attr("class", "legend");
legend.append("rect")
.attr("x", function(d, i){ return legendElementWidth * i;})
.attr("y", height)
.attr("width", legendElementWidth)
.attr("height", gridSize/2)
.style("fill", function(d, i) {return colors[i]; });
legend.append("text")
.attr("class", "mono")
.text(function(d) {return "≥ "+d.toString().substr(0,4);})
.attr("x", function(d, i){ return legendElementWidth *i;})
.attr("y", height+ gridSize);
d3.select("#n1")
.on("click", function() {
updateHeatmap("1_1.csv");
});
d3.select("#n2")
.on("click", function() {
updateHeatmap("1_2.csv");
});
;
}
);
</script>
<script>
</script>
</body>
</html>
上面的代码基本上与我在上面链接的小提琴相同，除了它包含2个按钮，和有传说，svg ，以及全局声明的热图变量。
这是我的问题的核心，这与我创建的更新功能有关，可以加载两个新的CSV：
function updateHeatmap(x){
svg.selectAll(".legend").attr("opacity", 0);
d3.csv(x, function(d){
return {
day:+d.day2,
hour:+d.hour,
value:+d.per_day_per_hour
};
},
function(error, data){
colorScale = d3.scale.quantile()
.domain([0, (d3.max(data, function(d){return d.value;})/2), d3.max(data, function(d){return d.value;})])
.range(colors);
var heatMap = svg.selectAll(".hour")
.data(data)
.transition().duration(1000)
.style("fill", function(d){ return colorScale(d.value);});
heatMap.selectAll("title").text(function(d) {return d.value;});
var legend = svg.selectAll(".legend")
.data([0].concat(colorScale.quantiles()), function(d) {return d;})
.enter().append("g")
.attr("class", "legend");
legend.append("rect")
.attr("x", function(d, i){ return legendElementWidth * i;})
.attr("y", height)
.attr("width", legendElementWidth)
.attr("height", gridSize/2)
.style("fill", function(d, i) {return colors[i]; });
legend.append("text")
.attr("class", "mono")
.text(function(d) {return "≥ "+d.toString().substr(0,4);})
.attr("x", function(d, i){ return legendElementWidth *i;})
.attr("y", height+ gridSize);
}
)
}
我已设法更新热图正方形（huzzah）的颜色，但无法获得位于热图下方的图例以进行合作，并且无法获得每个正方形下方的值，以便像我一样悬停显示在初始加载时做了。我觉得这是因为我的JS非常不稳定（因为我们面对它，我的D3），但不能确定 - 我认为这可能与我搞砸了选择文本元素的适当语法有关（也就是说，我不确定如何以正确的方式做到这一点）。
总结：this heatmap (here's the gist block)中的图例未正确更新，并且更新时不会显示每个方块的悬停值。让人惊讶。有什么建议吗？