我正在尝试使用D3.js绘制图形。 file.json是我的JSON文件。日期时间应该在X轴中，销售应该在Y轴中。
这是我的JSON结构，
[
{
Date : "2017-12-17 18:30:01",
Sales : "50"
},
{ Date : "2017-12-17 17:30:00",
Sales : "20"
},
{
Date : "2017-12-17 16:30:00",
Sales : "10"
}
]
我想绘制图表日期与销售数量。这是我的JS： -
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.line {
fill: none;
stroke: steelblue;
stroke-width: 2px;
}
</style>
<body>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
d3.json("file.json", function(data) {
var canvas = d3.select("body").append("svg")
.attr("width", 500)
.attr("height", 500)
.attr("border", "black")
var group = canvas.append("g")
.attr("transform", "translate(100,10)")
var line = d3.line()
.x(function(d, i) {
return d.Date;
})
.y(function(d, i) {
return d.Sales;
});
group.selectAll("path")
.data(data).enter()
.append("path")
.attr("d", function(d){ return line(d) })
.attr("fill", "none")
.attr("stroke", "green")
.attr("stroke-width", 3);
});
</script>
它显示错误： - Uncaught TypeError: Cannot read property 'line' of undefined。我从d3.svg.line()改为d3.line()，但它现在显示空白页面。
以下是您可能需要的示例（摘自：https://bl.ocks.org/mbostock/3883245）
var data = [
{
Date : "2017-12-17 18:30:01",
Sales : "50"
},
{ Date : "2017-12-17 17:30:00",
Sales : "20"
},
{
Date : "2017-12-17 16:30:00",
Sales : "10"
}
].map(function(entry) {
return {
Date: d3.timeParse("%Y-%m-%d %H:%M:%S")(entry.Date),
Sales: +entry.Sales
}
});
var svg = d3.select("svg"),
margin = {top: 20, right: 20, bottom: 30, left: 50},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom,
g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var x = d3.scaleTime()
.rangeRound([0, width]);
var y = d3.scaleLinear()
.rangeRound([height, 0]);
var line = d3.line()
.x(function(d) { return x(d.Date); })
.y(function(d) { return y(d.Sales); });
x.domain(d3.extent(data, function(d) { return d.Date; }));
y.domain(d3.extent(data, function(d) { return d.Sales; }));
g.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
g.append("g")
.call(d3.axisLeft(y))
g.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", "steelblue")
.attr("stroke-linejoin", "round")
.attr("stroke-linecap", "round")
.attr("stroke-width", 1.5)
.attr("d", line);<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.12.0/d3.min.js"></script>'
<svg width="600" height="180"></svg>