d3 v4 实现中 d3-brush 的 JS 错误
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【中文标题】d3 v4 实现中 d3-brush 的 JS 错误【英文标题】:JS error for d3-brush in d3 v4 implementation 【发布时间】:2017-05-13 12:06:13 【问题描述】:此示例适用于 d3 v3 版本。它是this sample 的修剪版本,在与按钮交互时,画笔会在其新位置设置动画。
我实际上是在尝试使用 d3 v4 版本来做this。
进行修剪以识别关注区域。修剪后的代码是
var margin = top: 10, right: 10, bottom: 100, left: 40 ,
margin2 = top: 430, right: 10, bottom: 20, left: 40 ,
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom,
height2 = 500 - margin2.top - margin2.bottom;
var parseDate = d3.timeParse("%b %Y");
var x = d3.scaleTime().range([0, width]),
x2 = d3.scaleTime().range([0, width]),
y = d3.scaleLinear().range([height, 0]),
y2 = d3.scaleLinear().range([height2, 0]);
var xAxis = d3.axisBottom(x),
xAxis2 = d3.axisBottom(x2),
yAxis = d3.axisLeft(y);
var brush = d3.brushX(x2)
.on("brush end", brushed);
var area1 = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) return x(d.date); )
.y0(height)
.y1(function(d) return y(d.price); );
var area2 = d3.area()
.curve(d3.curveMonotoneX)
.x(function(d) return x2(d.date); )
.y0(height2)
.y1(function(d) return y2(d.price); );
// make some buttons to drive our zoom
d3.select("body").append("div")
.attr("id","btnDiv")
.style('font-size','75%')
.style("width","250px")
.style("position","absolute")
.style("left","5%")
.style("top","200px")
var btns = d3.select("#btnDiv").selectAll("button").data([2001, 2002, 2003, 2004])
btns = btns.enter().append("button").style("display","inline-block")
// fill the buttons with the year from the data assigned to them
btns.each(function (d)
this.innerText = d;
)
btns.on("click", drawBrush);
function drawBrush()
// define our brush extent to be begin and end of the year
brush.extent([new Date(this.innerText + '-01-01'), new Date(this.innerText + '-12-31')])
// now draw the brush to match our extent
// use transition to slow it down so we can see what is happening
// remove transition so just d3.select(".brush") to just draw
brush(d3.select(".brush").transition());
// now fire the brushstart, brushmove, and brushend events
// remove transition so just d3.select(".brush") to just draw
brush.event(d3.select(".brush").transition().delay(1000))
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom);
svg.append("defs").append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
var focus = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var context = svg.append("g")
.attr("class", "context")
.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
d3.csv("sp500.csv", type, function(error, data)
if (error) throw error;
x.domain(d3.extent(data, function(d) return d.date; ));
y.domain([0, d3.max(data, function(d) return d.price; )]);
x2.domain(x.domain());
y2.domain(y.domain());
context.append("g")
.attr("class", "x brush")
.call(brush)
.selectAll("rect")
.attr("y", -6)
.attr("height", height2 + 7);
);
function brushed()
x.domain(brush.empty() ? x2.domain() : brush.extent());
function type(d)
d.date = parseDate(d.date);
d.price = +d.price;
return d;
svg
font: 10px sans-serif;
.area
fill: steelblue;
clip-path: url(#clip);
.axis path,
.axis line
fill: none;
stroke: #000;
shape-rendering: crispEdges;
.brush .extent
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg
font: 10px sans-serif;
.area
fill: steelblue;
clip-path: url(#clip);
.axis path,
.axis line
fill: none;
stroke: #000;
shape-rendering: crispEdges;
.brush .extent
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
</style>
<body>
<script src="http://d3js.org/d3.v4.js"></script>
</body>
请参考fiddle 以获取更正错误。附在sn-p中的时候报错是不一样的
任何帮助都是非常值得赞赏的。
更新: 错误是
d3.v4.js:12632 Uncaught TypeError: group.property is not a function
有没有人预感什么是新的 API 来解决单击此 fiddle 中的按钮时出现的错误如果有人可以为它更新小提琴,那就太棒了。或者至少让我知道修改后的 API,因为这些示例适用于 v3。
【问题讨论】:
投反对票???如果我问错了问题,或者问错了平台,请告诉我? 我看到了同样的错误信息,也许你同时找到了解决方案? 【参考方案1】:我在上述示例之后遇到了同样的错误,并找到了您的问题。由于您的小提琴无法正常工作(无法访问 CSV),因此我无法确认我的答案是否适合您。但它在本地对我有用。
在 v4 上它变得非常简单。只需调用brush.move(group, selection) 以编程方式移动画笔选择。但是selection
这个参数好像是基于画笔范围的相对坐标,所以如果你的坐标轴是日期/时间,你可能需要把日期转换成坐标数。
例如,我在定义画笔时传入了一个范围参数。
let width = 200;
let height = 80;
let x = d3.scaleTime().range([0, width]);
let brush = d3.brushX()
.extent([[0, 0], [width, height]])
.on("brush end", brushed);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, x.range());
然后我修改drawBrush()函数只使用brush.move():
function drawBrush()
// Convert your dates to pixels along the brush's width.
let start = x(new Date(this.innerText + '-01-01'));
let end = x(new Date(this.innerText + '-12-31'));
// Alternatively, let's say the coordinates of your year is from 20% to 40% of your graph.
// let start = 0.2 * width;
// let end = 0.4 * width;
brush.move(context.select("g.brush").transition().delay(1000).duration(500), [start, end]);
不幸的是,这个解决方案会打破drawBrush()函数的两步过渡,将其组合成一个动画。您必须自己进行其他修改。
【讨论】:
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