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使用D3.JS繪制圖形

[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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