D3条形图示例不在本地工作 [英] D3 Bar Graph example not working locally
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 frequency A .08167 B .01492 C .02780 D .04253 E .12702 F .02288 G .02022 H .06094 I .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，由于同源政策，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 http-server 。
from the command line in the directory with your files will do it. If you prefer node.js, try http-server.
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