Question

我有散点d3.js库的javascript：

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
font: 10px sans-serif;
}

.axis path, .axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}

.point {
fill: steelblue;
stroke: #000;
}

</style>
<body>
<script src="http://d3js.org/d3.v2.js?2.9.6"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
.range([0, width]);

var y = d3.scale.linear()
.range([height, 0]);

var svg = d3.select("body").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 + ")");

d3.csv("data.csv", function(data) {

 // Coerce the strings to numbers.
data.forEach(function(d) {
d.x = +d.x;
d.y = +d.y;
});

// Compute the scales’ domains.
x.domain(d3.extent(data, function(d) { return d.x; })).nice();
y.domain(d3.extent(data, function(d) { return d.y; })).nice();

// Add the x-axis.
 svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(d3.svg.axis().scale(x).orient("bottom"));

 // Add the y-axis.
svg.append("g")
  .attr("class", "y axis")
  .call(d3.svg.axis().scale(y).orient("left"));

// Add the points!
svg.selectAll(".point")
  .data(data)
  .enter().append("path")
  .attr("class", "point")
  .attr("d", d3.svg.symbol().type("triangle-up"))
  .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; });
});

</script>

文件：data.cvs

x,y
5,90
25,30
45,50
65,55
85,25

我没有从cvs文件中读取数据，而是在javascript中添加了一个数组，并试图直接从这个数组中提取x和y值：

var rows = new array(
 array(0,0),
 array(90,90),
 array(59,70),
 array(65,77),
 array(85,66)
  );

如何使用数组行以获得相同的结果??

Answer 1

您可以使用哈希数组：

var data = [{"x":"5","y":"90"},{"x":"25","y":"30"},{"x":"45","y":"50"},
{"x":"65","y":"55"},{"x":"85","y":"25"}];

或编写一个函数将数组数组转换为这个哈希数组。

var rows = new Array(
  Array(0,0),
  Array(90,90),
  Array(59,70),
  Array(65,77),
  Array(85,66)
);

for (var i = 0; i < rows.length; i++) {
  data.push({x: rows[i][0], y: rows[i][1]});
}

// Coerce the strings to numbers.
data.forEach(function(d) {
  d.x = +d.x;
  d.y = +d.y;
});

这是实时代码：

http://vida.io/documents/THpmgQDARSWPJqGG5

在d3.js分散文件中使用数据数组而不是外部数据文件

1 个答案: