我正在使用 d3.js v4 来制作条形图。我只想要最高和最低值作为条形图中的刻度
上图显示了给定数据的几个刻度。它应该只打印在 yaxis 上的 0 和 7，删除其他值。
我们如何维护每个柱上的数据值。
下面是正在使用的 d3.js 代码
var margin = {top: 20, right: 20, bottom: 70, left: 40}
var data =[
{
"Type_Miss":"High",
"Value_Miss":"5"
},
{
"Type_Miss":"Medium",
"Value_Miss":"1"
},
{
"Type_Miss":"Ignore",
"Value_Miss":"2"
},
{
"Type_Miss":"High",
"Value_Miss":"4"
},
{
"Type_Miss":"High",
"Value_Miss":"7"
},
{
"Type_Miss":"High",
"Value_Miss":"1"
},
{
"Type_Miss":"High",
"Value_Miss":"3"
}];
var width = 650 - margin.left - margin.right
var height = 300 - margin.top - margin.bottom;
var height1 = 400-margin.top - margin.bottom;
var svg = d3.select("#bardiv").append("svg")
.attr("width", width + margin.left + margin.right+60)
.attr("height", height1 + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")")
.data([data]) ;
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain(data.map(function(d) { return d.Type_Miss; }));
y.domain([0, d3.max(data, function(d) { return d.Value_Miss; })]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", "-.55em")
.attr("transform", "rotate(-90)" );
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("dx","0.81em")
.attr("text-anchor", "end");
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.Type_Miss); })
.attr("y", function(d) { return y(d.Value_Miss); })
.attr("width", x.bandwidth())
.attr("height", function(d) { return height - y(d.Value_Miss); });
最佳答案
由于您只想显示最小和最大刻度，因此您可以简单地使用域作为 getter...
y.domain()
...在 tickValues 函数中设置刻度。检查这个演示:
var margin = {
top: 20,
right: 20,
bottom: 70,
left: 40
};
var data = [{
"Type_Miss": "High",
"Value_Miss": "5"
}, {
"Type_Miss": "Medium",
"Value_Miss": "1"
}, {
"Type_Miss": "Ignore",
"Value_Miss": "2"
}, {
"Type_Miss": "High",
"Value_Miss": "4"
}, {
"Type_Miss": "High",
"Value_Miss": "7"
}, {
"Type_Miss": "High",
"Value_Miss": "1"
}, {
"Type_Miss": "High",
"Value_Miss": "3"
}];
var width = 650 - margin.left - margin.right
var height = 300 - margin.top - margin.bottom;
var height1 = 400 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right + 60)
.attr("height", height1 + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")")
.data([data]);
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain(data.map(function(d) {
return d.Type_Miss;
}));
y.domain([0, d3.max(data, function(d) {
return d.Value_Miss;
})]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", "-.55em")
.attr("transform", "rotate(-90)");
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y).tickValues(y.domain()))
.append("text")
.attr("transform", "rotate(90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("dx", "0.81em")
.attr("text-anchor", "end");
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) {
return x(d.Type_Miss);
})
.attr("y", function(d) {
return y(d.Value_Miss);
})
.attr("width", x.bandwidth())
.attr("height", function(d) {
return height - y(d.Value_Miss);
});<script src="//d3js.org/d3.v4.min.js"></script>作为附加信息，如果您想显示数据中的最小值和最大值(不包括零基线)，只需使用 d3.min 和 d3.max:
.tickValues([d3.min(data, d => d.Value_Miss), d3.max(data, d => d.Value_Miss)])
这是演示:
var margin = {
top: 20,
right: 20,
bottom: 70,
left: 40
};
var data = [{
"Type_Miss": "High",
"Value_Miss": "5"
}, {
"Type_Miss": "Medium",
"Value_Miss": "1"
}, {
"Type_Miss": "Ignore",
"Value_Miss": "2"
}, {
"Type_Miss": "High",
"Value_Miss": "4"
}, {
"Type_Miss": "High",
"Value_Miss": "7"
}, {
"Type_Miss": "High",
"Value_Miss": "1"
}, {
"Type_Miss": "High",
"Value_Miss": "3"
}];
var width = 650 - margin.left - margin.right
var height = 300 - margin.top - margin.bottom;
var height1 = 400 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right + 60)
.attr("height", height1 + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")")
.data([data]);
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
y = d3.scaleLinear().rangeRound([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain(data.map(function(d) {
return d.Type_Miss;
}));
y.domain([0, d3.max(data, function(d) {
return d.Value_Miss;
})]);
g.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", "-.55em")
.attr("transform", "rotate(-90)");
g.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y).tickValues([d3.min(data, d=>d.Value_Miss),d3.max(data, d=>d.Value_Miss)]))
.append("text")
.attr("transform", "rotate(90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("dx", "0.81em")
.attr("text-anchor", "end");
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) {
return x(d.Type_Miss);
})
.attr("y", function(d) {
return y(d.Value_Miss);
})
.attr("width", x.bandwidth())
.attr("height", function(d) {
return height - y(d.Value_Miss);
});<script src="//d3js.org/d3.v4.min.js"></script>关于javascript - 仅在 d3.js 条形图的 Y 轴上维护最高和最低值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42878585/