我想在div 中添加图例，以便在散点图数量增加时自动滚动。 以下是我的示例代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js"></script>
<style type="text/css">
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
.y1 {
fill: white;
stroke: orange;
stroke-width: 1.5px;
}
.y2 {
fill: white;
stroke: red;
stroke-width: 1.5px;
}
.y3 {
fill: white;
stroke: steelblue;
stroke-width: 1.5px;
}
.line {
fill: none;
stroke-width: 1.5px;
}
div.tooltip {
position: absolute;
text-align: center;
width: 50px;
height: 10px;
padding: 5px;
font: 10px sans-serif;
background: whiteSmoke;
border: solid 1px #aaa;
pointer-events: none;
box-shadow: 2px 2px 1px #888;
}
.legend1 {
width:45px;
height: 5px;
padding: 0px;
overflow: auto;
font: 10px sans-serif;
background: yellow;
border: 1px solid #bbb;
background-color: #cccccc;
box-shadow: 2px 2px 1px #888;
}
.title {
font: 13px sans-serif;
}
</style>
</head>
<body>
</div>
<script type="text/javascript">
//Width and height
var w = 500;
var h = 500; // chart height
var padding = 50;
var now = d3.time.hour.utc(new Date);
var dataset = [
[
{x: d3.time.hour.utc.offset(now, -5), y: 0},
{x: d3.time.hour.utc.offset(now, -4), y: 0},
{x: d3.time.hour.utc.offset(now, -3), y: 2},
{x: d3.time.hour.utc.offset(now, -2), y: 0},
{x: d3.time.hour.utc.offset(now, -1), y: 0},
{x: now, y: 0}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 3},
{x: d3.time.hour.utc.offset(now, -4), y: 1},
{x: d3.time.hour.utc.offset(now, -3), y: 3},
{x: d3.time.hour.utc.offset(now, -2), y: 1},
{x: d3.time.hour.utc.offset(now, -1), y: 5},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 3},
{x: d3.time.hour.utc.offset(now, -4), y: 5},
{x: d3.time.hour.utc.offset(now, -3), y: 2},
{x: d3.time.hour.utc.offset(now, -2), y: 1},
{x: d3.time.hour.utc.offset(now, -1), y: 7},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 5},
{x: d3.time.hour.utc.offset(now, -4), y: 2},
{x: d3.time.hour.utc.offset(now, -3), y: 3},
{x: d3.time.hour.utc.offset(now, -2), y: 4},
{x: d3.time.hour.utc.offset(now, -1), y: 6},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 1},
{x: d3.time.hour.utc.offset(now, -4), y: 2},
{x: d3.time.hour.utc.offset(now, -3), y: 3},
{x: d3.time.hour.utc.offset(now, -2), y: 4},
{x: d3.time.hour.utc.offset(now, -1), y: 5},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 5},
{x: d3.time.hour.utc.offset(now, -4), y: 4},
{x: d3.time.hour.utc.offset(now, -3), y: 3},
{x: d3.time.hour.utc.offset(now, -2), y: 2},
{x: d3.time.hour.utc.offset(now, -1), y: 1},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 0},
{x: d3.time.hour.utc.offset(now, -4), y: 2},
{x: d3.time.hour.utc.offset(now, -3), y: 4},
{x: d3.time.hour.utc.offset(now, -2), y: 6},
{x: d3.time.hour.utc.offset(now, -1), y: 8},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 8},
{x: d3.time.hour.utc.offset(now, -4), y: 9},
{x: d3.time.hour.utc.offset(now, -3), y: 7},
{x: d3.time.hour.utc.offset(now, -2), y: 6},
{x: d3.time.hour.utc.offset(now, -1), y: 5},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 3},
{x: d3.time.hour.utc.offset(now, -4), y: 2},
{x: d3.time.hour.utc.offset(now, -3), y: 1},
{x: d3.time.hour.utc.offset(now, -2), y: 0},
{x: d3.time.hour.utc.offset(now, -1), y: 5},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 5},
{x: d3.time.hour.utc.offset(now, -4), y: 8},
{x: d3.time.hour.utc.offset(now, -3), y: 2},
{x: d3.time.hour.utc.offset(now, -2), y: 1},
{x: d3.time.hour.utc.offset(now, -1), y: 6},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 8},
{x: d3.time.hour.utc.offset(now, -4), y: 6},
{x: d3.time.hour.utc.offset(now, -3), y: 4},
{x: d3.time.hour.utc.offset(now, -2), y: 2},
{x: d3.time.hour.utc.offset(now, -1), y: 0},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 1},
{x: d3.time.hour.utc.offset(now, -4), y: 0},
{x: d3.time.hour.utc.offset(now, -3), y: 2},
{x: d3.time.hour.utc.offset(now, -2), y: 3},
{x: d3.time.hour.utc.offset(now, -1), y: 2},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 6},
{x: d3.time.hour.utc.offset(now, -4), y: 4},
{x: d3.time.hour.utc.offset(now, -3), y: 8},
{x: d3.time.hour.utc.offset(now, -2), y: 3},
{x: d3.time.hour.utc.offset(now, -1), y: 2},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 1},
{x: d3.time.hour.utc.offset(now, -4), y: 3},
{x: d3.time.hour.utc.offset(now, -3), y: 6},
{x: d3.time.hour.utc.offset(now, -2), y: 9},
{x: d3.time.hour.utc.offset(now, -1), y: 5},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 8},
{x: d3.time.hour.utc.offset(now, -4), y: 5},
{x: d3.time.hour.utc.offset(now, -3), y: 0},
{x: d3.time.hour.utc.offset(now, -2), y: 2},
{x: d3.time.hour.utc.offset(now, -1), y: 3},
{x: now, y: 1}
],
[
{x: d3.time.hour.utc.offset(now, -5), y: 2},
{x: d3.time.hour.utc.offset(now, -4), y: 4},
{x: d3.time.hour.utc.offset(now, -3), y: 1},
{x: d3.time.hour.utc.offset(now, -2), y: 2},
{x: d3.time.hour.utc.offset(now, -1), y: 3},
{x: now, y: 1}
]
];
var color_hash = { 0 : ["A", "red"],
1 : ["B", "green"],
2 : ["C", "Yellow"],
3 : ["D", "orange"],
4 : ["F", "blue"],
5 : ["G", "pink"],
6 : ["H", "grey"],
7 : ["I", "purple"],
8 : ["J", "Coral"],
9 : ["K", "Crimson"],
10 : ["L", "DarkOliveGreen"],
11 : ["M", "DarkSeaGreen"],
12 : ["N", "DarkRed"],
13 : ["O", "DarkKhaki"],
14 : ["P", "Chocolate"],
15 : ["Q", "Black"]
}
// Define axis ranges & scales
var yExtents = d3.extent(d3.merge(dataset), function (d) { return d.y; });
var xExtents = d3.extent(d3.merge(dataset), function (d) { return d.x; });
var xScale = d3.time.scale()
.domain([xExtents[0], xExtents[1]])
.range([padding, w - padding * 2]);
var yScale = d3.scale.linear()
.domain([0, yExtents[1]])
.range([h - padding, padding]);
// Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
// Define lines
var line = d3.svg.line()
.x(function(d) { return x(d.x); })
.y(function(d) { return y(d.y1, d.y2, d.y3); });
var pathContainers = svg.selectAll('g.line')
.data(dataset);
pathContainers.enter().append('g')
.attr('class', 'line')
.attr("style", function(d) {
return "stroke: " + color_hash[dataset.indexOf(d)][1];
});
pathContainers.selectAll('path')
.data(function (d) { return [d]; }) // continues the data from the pathContainer
.enter().append('path')
.attr('d', d3.svg.line()
.x(function (d) { return xScale(d.x); })
.y(function (d) { return yScale(d.y); })
);
// add circles
pathContainers.selectAll('circle')
.data(function (d) { return d; })
.enter().append('circle')
.attr('cx', function (d) { return xScale(d.x); })
.attr('cy', function (d) { return yScale(d.y); })
.attr('r', 3);
//Define X axis
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(5);
//Define Y axis
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.ticks(5);
//Add X axis
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + (h - padding) + ")")
.call(xAxis);
//Add Y axis
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
// Add title
svg.append("svg:text")
.attr("class", "title")
.attr("x", 20)
.attr("y", 20)
.text("Fruit Sold Per Hour");
/* var legend = d3.select("body").append("div")
.attr("class", "legend")
.attr('transform', 'translate(-20,50)'); */
// add legend
var legend = svg.append("g")
.attr("class", "legend1")
.attr('transform', 'translate(-20,50)')
legend.selectAll('rect')
.data(dataset)
.enter()
.append("rect")
.attr("x", w - 75)
.attr("y", function(d, i){ return i * 20;})
.attr("width", 5)
.attr("height", 5)
.style("fill", function(d) {
var color = color_hash[dataset.indexOf(d)][1];
return color;
})
legend.selectAll('text')
.data(dataset)
.enter()
.append("text")
.attr("x", w - 65)
.attr("width", 5)
.attr("height", 5)
.attr("y", function(d, i){ return i * 20 + 5;})
.text(function(d) {
var text = color_hash[dataset.indexOf(d)][0];
return text;
});
</script>
</body>
当序列数量增加时，如何在带有滚动的指定高度和宽度的div 中放置图例
您可以通过
将图表和图例放入两个单独的<div>来解决此问题。
首先，我们将添加它们：
<body>
<div id="chart" class="chart"></div>
<div id="legend" class="legend"></div>
</body>
其次，我们将设置它们的样式（我在这里手动完成，但您可以在脚本中使用setAttribute(...)）。
.legend {
overflow: auto;
height: 200px;
width: 50px;
}
.chart {
float: left;
}
设置overflow: auto是使div 可滚动的原因。 float: left使<div>的显示并排显示。
最后，我们将更改 d3 脚本以通过为每个div 创建 svg 元素来反映这一点。
var svg = d3.select("#chart")
.append("svg")
.attr("width", w)
.attr("height", h);
var svg2 = d3.select("#legend")
.append("svg")
.attr("width", 30)
.attr("height", 20*dataset.length);
您可以在此处查看结果。