D3条形图示例不在本地工作

本文介绍了D3条形图示例不在本地工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是D3的新手，想了解一个例子在本地如何工作。我将条形图代码复制并粘贴到名为index.html的本地文件，并且还复制了data.tsv。出于某种原因，当我在浏览器上打开文件时，绝对没有显示任何内容！我试图将脚本src更改为d3 / d3.v3.min.js，因为这是我下载的d3文件夹。但是，这也不工作。对于我试过的每个例子，我还没有成功地查看D3示例。

I am very new to D3, and wanted to see how an example would work locally. I copied and pasted the bar graph code to a local file called index.html, and also copied over the data.tsv. For some reason, absolutely nothing is showing up when I open the file on a browser! I tried changing the script src to "d3/d3.v3.min.js" because that is the folder the d3 I downloaded is in. However, this does not work either. For every example I have tried I have yet to successfully view a D3 example. Help would be appreciated!

index.html代码如下：

The index.html code is as follows:

<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

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

.bar {
fill: steelblue;
}

.x.axis path {
 display: none;
}

</style>
<body>
<script src="d3/d3.v3.min.js"></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 formatPercent = d3.format(".0%");

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

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

var xAxis = d3.svg.axis()
   .scale(x)
   .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(formatPercent);

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.tsv("data.tsv", type, function(error, data) {
 x.domain(data.map(function(d) { return d.letter; }));
 y.domain([0, d3.max(data, function(d) { return d.frequency; })]);

  svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis);

  svg.append("g")
  .attr("class", "y axis")
  .call(yAxis)
  .append("text")
  .attr("transform", "rotate(-90)")
  .attr("y", 6)
  .attr("dy", ".71em")
  .style("text-anchor", "end")
  .text("Frequency");

  svg.selectAll(".bar")
  .data(data)
  .enter().append("rect")
  .attr("class", "bar")
  .attr("x", function(d) { return x(d.letter); })
  .attr("width", x.rangeBand())
  .attr("y", function(d) { return y(d.frequency); })
  .attr("height", function(d) { return height - y(d.frequency); });

});

function type(d) {
d.frequency = +d.frequency;
 return d;
}

</script>

，data.tsv格式如下：
字母频率
A .08167
B .01492
C .02780
D .04253
E .12702
F .02288
G .02022
H .06094
I .06973

and the data.tsv is in the following format:letter frequencyA .08167B .01492C .02780D .04253E .12702F .02288G .02022H .06094I .06973

推荐答案

d3.tsv 方法对数据进行AJAX请求。在大多数浏览器上，由于，此类广告不会在本地发挥作用禁止对 file：/// urls的AJAX请求。

The d3.tsv method makes an AJAX request for data. On most browsers, this won't work locally due to the Same Origin Policy, which generally prohibits AJAX requests to file:/// urls.

要获取使用本地运行AJAX的示例，需要一个本地Web服务器。如果你有Python，运行

To get an example that uses AJAX running locally, you'll need a local webserver. If you have Python, running

> python -m SimpleHTTPServer

从目录中的命令行与您的文件将做它。如果您偏好node.js，请尝试。

from the command line in the directory with your files will do it. If you prefer node.js, try http-server.

这篇关于D3条形图示例不在本地工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！