在学习了这个优秀的 d3.js 教程后,我喜欢在每个条形顶部添加条形值!下面的示例代码文本不显示!
XYZ.csv
year,value
2011,45
2012,47
2013,52
2014,70
2015,75
2016,78
html文件:
<!doctype html>
<html>
<head>
<style>
.bar {
fill: steelblue;
}
</style>
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body>
<svg width="600" height="500"></svg>
<script>
var svg = d3.select("svg"),
margin = 200,
width = svg.attr("width") - margin,
height = svg.attr("height") - margin
var xScale = d3.scaleBand().range([0, width]).padding(0.4),
yScale = d3.scaleLinear().range([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + 100 + "," + 100 + ")");
d3.csv("XYZ.csv", function(error, data) {
if (error) {
throw error;
}
xScale.domain(data.map(function(d) { return d.year; }));
yScale.domain([0, d3.max(data, function(d) { return d.value; })]);
g.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(xScale));
g.append("g")
.call(d3.axisLeft(yScale).tickFormat(function(d){
return "$" + d;
}).ticks(10));
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return xScale(d.year); })
.attr("y", function(d) { return yScale(d.value); })
.attr("width", xScale.bandwidth())
.attr("height", function(d) { return height - yScale(d.value); })
.append("text")
.attr("x", function(d) { return xScale(d.year); })
.attr("y", function(d) { return yScale(d.value); })
.attr("text", function(d) { return d.value; })
});
</script>
</body>
</html>
为每个条形顶部的文本添加以下代码:
.append("text")
.attr("x", function(d) { return xScale(d.year); })
.attr("y", function(d) { return yScale(d.value); })
.attr("text", function(d) { return d.value; })
不可能将 a 附加<text>
到 a <rect>
。只需单独添加文本:
g.selectAll(".bar-title")
.data(data)
.enter()
.append("text")
.classed('bar-title', true)
.attr('text-anchor', 'middle')
.attr("x", d => xScale(d.year) + xScale.bandwidth()/2)
.attr("y", d => yScale(d.value))
.text(d => `$${d.value}`);
......或者,你可以追加一个<g>
元素上enter()
,然后追加<text>
和<rect>
下<g>
。
const data = [
{year: 2011, value: 45},
{year: 2012, value: 47},
{year: 2013, value: 52},
{year: 2014, value: 70},
{year: 2015, value: 75},
{year: 2016, value: 78}
];
var svg = d3.select("svg"),
margin = 200,
width = svg.attr("width") - margin,
height = svg.attr("height") - margin
var xScale = d3.scaleBand().range([0, width]).padding(0.4),
yScale = d3.scaleLinear().range([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + 100 + "," + 100 + ")");
xScale.domain(data.map(function(d) { return d.year; }));
yScale.domain([0, d3.max(data, function(d) { return d.value; })]);
g.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(xScale));
g.append("g")
.call(d3.axisLeft(yScale).tickFormat(function(d){
return "$" + d;
}).ticks(10));
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return xScale(d.year); })
.attr("y", function(d) { return yScale(d.value); })
.attr("width", xScale.bandwidth())
.attr("height", function(d) { return height - yScale(d.value); })
g.selectAll(".bar-title")
.data(data)
.enter()
.append("text")
.classed('bar-title', true)
.attr('text-anchor', 'middle')
.attr("x", d => xScale(d.year) + xScale.bandwidth()/2)
.attr("y", d => yScale(d.value) - 5)
.text(d => `$${d.value}`);
.bar {
fill: steelblue;
}
.bar-title {
font-family: 'Ubuntu';
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.13.0/d3.min.js"></script>
<svg width="600" height="500"></svg>
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