[英]Plot a graph using D3.JS
我正在嘗試使用D3.js繪制圖形。 file.json是我的JSON文件。 日期時間應該在X軸上,而銷售應該在Y軸上。
這是我的JSON結構,
[
{
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"
}
]
我想繪制一個圖表日期與銷售數量。 這是我的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>
它顯示錯誤: Uncaught TypeError: Cannot read property 'line' of undefined
。 我從d3.svg.line()
更改為d3.line()
,但現在顯示空白頁。
這是您可能想要的示例(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>
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