当x轴和数据具有时间范围时，如何将数据放在折线图上

Question

我需要使用 d3 创建一个折线图，其中 x 轴将以 1 小时的间隔%H:%M:%S格式显示时间。我正在使用d3.svg.line在图形上画线。X 轴和 Y 轴都绘制正确，但线不会绘制，出现异常。

错误：属性 d：预期数量...

xLable 值未转换为行路径？

var	elementid = "#linechart";
var margin = {top: 10, right: 30, bottom: 90, left: 30};
var width = $(elementid).innerWidth()  - (margin.left + margin.right);
var height = $(elementid).innerHeight() - (margin.top + margin.bottom);
var	data = [{xLabel: "00:30:00", yLabel: 50},
{xLabel: "04:00:20", yLabel: 12},
{xLabel: "10:00:00", yLabel: 10},
{xLabel: "14:20:00", yLabel: 5},
{xLabel: "15:30:10", yLabel: 11},
{xLabel: "17:00:00", yLabel: 12},
{xLabel: "19:00:00", yLabel: 30},
{xLabel: "22:00:00", yLabel: 25}];
var x = d3.time.scale()
.nice(d3.time.day)
.range([0, width - margin.left - margin.right]);
var y = d3.scale.linear().range([height, 0]);
y.domain([0, d3.max(data, function (d) {
return d.yLabel;
})]);
var xAxis = d3.svg.axis().scale(x)
.ticks(d3.time.hours,1).tickFormat(d3.time.format("%H:%M:%S"));
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
var svg = d3.select(elementid)
.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 + ")");
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function (d) {
return "rotate(-65)"
});		
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
// Define the line
var valueline = d3.svg.line()
.x(function (d) {
return x(d.xLabel);
})
.y(function (d) {
return y(d.yLabel);
});
// Add the valueline path.
svg.append("path")
.attr("class", "line")
.attr("d", valueline(data));

html,body { width:100%; height:100%; margin:none; padding:none; }
#linechart { width:95%; height:95%; margin:none; padding:none; }
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path, .axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="linechart" />

Answer 1

因此，数据中的xLabel格式不正确。您必须将字符串解析为日期格式。

data.forEach(function(d) {
d.xLabel = d3.time.format("%H:%M:%S").parse(d.xLabel);
d.yLabel = d.yLabel;
});

我稍微改变了这一行(基于处理 d3.js 轴上的日期(

var x = d3.time.scale().domain([data[0].xLabel, data[7].xLabel]).range([0,  
width - margin.left - margin.right]);

var	elementid = "#linechart";
var margin = {top: 10, right: 30, bottom: 90, left: 30};
var width = $(elementid).innerWidth()  - (margin.left + margin.right);
var height = $(elementid).innerHeight() - (margin.top + margin.bottom);
var	data = [{xLabel: "00:30:00", yLabel: 50},
{xLabel: "04:00:20", yLabel: 12},
{xLabel: "10:00:00", yLabel: 10},
{xLabel: "14:20:00", yLabel: 5},
{xLabel: "15:30:10", yLabel: 11},
{xLabel: "17:00:00", yLabel: 12},
{xLabel: "19:00:00", yLabel: 30},
{xLabel: "22:00:00", yLabel: 25},
{xLabel: "23:30:00", yLabel: 25}];
data.forEach(function(d) {
d.xLabel = d3.time.format("%H:%M:%S").parse(d.xLabel);
d.yLabel = d.yLabel;
});

var startDate = d3.time.format("%H:%M:%S").parse("00:00:00");

var endDate = d3.time.format("%H:%M:%S").parse("23:00:00");

var x = d3.time.scale().domain([startDate, endDate]).range([0,  width - margin.left - margin.right]);
var y = d3.scale.linear().range([height, 0]);
y.domain([0, d3.max(data, function (d) {
return d.yLabel;
})]);
var xAxis = d3.svg.axis().scale(x)
.ticks(d3.time.hours,1).tickFormat(d3.time.format("%H:%M:%S"));
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
var svg = d3.select(elementid)
.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 + ")");
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.selectAll("text")
.style("text-anchor", "end")
.attr("dx", "-.8em")
.attr("dy", ".15em")
.attr("transform", function (d) {
return "rotate(-65)"
});		
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
// Define the line
var valueline = d3.svg.line()
.x(function (d) {
return x(d.xLabel);
})
.y(function (d) {
return y(d.yLabel);
});
// Add the valueline path.
svg.append("path")
.attr("class", "line")
.attr("d", valueline(data));

html,body { width:100%; height:100%; margin:none; padding:none; }
#linechart { width:95%; height:95%; margin:none; padding:none; }
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path, .axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="linechart" />