我有一个包含 11 个不同变量的数据集(包含 12 列的 csv 文件)。我希望能够为我的散点图选择某一列,但我遇到了一些困难。请耐心等待,因为 JavaScript 不是我的强项(显然)。这是我尝试过的:
<div class="variables" id="fixedacidity" onclick="drawPlot('fixedacidity');">
<h1>fixed acidity</h1>
</div>
<div class="variables" id="volatileacidity" onclick="drawPlot('volatileacidity');">
<h1>volatile acidity</h1>
</div>
<div class="variables" id="citricacid" onclick="drawPlot('citricacid');">
<h1>citric acid</h1>
</div>
<div class="variables" id="residualsugar" onclick="drawPlot('residualsugar');">
<h1>residual sugar</h1>
</div>
etc ...
我制作了一个调用drawPlot
函数的简单菜单,但我在尝试正确传递变量时遇到了麻烦。
相关 d3/javascript:
function drawPlot(selectedVar){
$(".visarea").html("");
var wineVar = selectedVar;
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 860 - margin.left - margin.right,
height = 350 - margin.top - margin.bottom;
var x = d3.scale.linear()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0])
.domain([0,10]);
var color = d3.scale.category10();
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left").ticks(10);
var chart1 = d3.select(".visarea").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("red.csv", function(error, data) {
if (error) throw error;
data.forEach(function(d) {
d.wineVar = +d.wineVar;
d.quality = +d.quality;
});
x.domain(d3.extent(data, function(d) { return d.wineVar; })).nice();
y.domain([0,10]).nice();
chart1.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.append("text")
.attr("class", "label")
.attr("x", width)
.attr("y", -6)
.style("text-anchor", "end")
.text(wineVar);
chart1.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("class", "label")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Rated Quality")
chart1.selectAll(".red.dot")
.data(data)
.enter().append("circle")
.attr("class", "red dot")
.attr("r", 3)
.attr("cx", function(d) { return x(d.wineVar); })
.attr("cy", function(d) { return y(d.quality); })
.style("fill", "red");
});
}
虽然变量被传递给函数,但 d.wineVar
正如预期的那样,不会返回所需的值,因此图表不会绘制正确的值。谁能推荐一个解决方法?这看起来很简单,但我花了几个小时试图弄清楚这一点。
red.csv 示例:
fixedacidity,volatileacidity,citricacid,residualsugar,chlorides,freesulfurdioxide,totalsulfurdioxide,density,pH,sulphates,alcohol,quality
7.4,0.7,0,1.9,0.076,11,34,0.9978,3.51,0.56,9.4,5
7.8,0.88,0,2.6,0.098,25,67,0.9968,3.2,0.68,9.8,5
7.8,0.76,0.04,2.3,0.092,15,54,0.997,3.26,0.65,9.8,5
我正在努力实现的目标的图像。第一个数据集,fixedacidity,绘制得很好。我在尝试让菜单正确显示其各自的数据集时遇到困难。 “额定质量”始终是 Y 轴的数据。
最佳答案
您的变量引用错误,此处:
data.forEach(function(d) {
d.wineVar = +d.wineVar; // <---------Here
d.quality = +d.quality;
});
更改方式:
data.forEach(function(d) {
d.wineVar = +d[wineVar]; // <----------Here
d.quality = +d.quality;
});
关于javascript - D3.js——如何通过 Javascript 更新数据集?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37630640/