使用d3.js从.csv导入数据

Importing data from .csv using d3.js

本文关键字：导入 数据 csv d3 js 使用      更新时间：2023-09-26

我正在尝试使用d3.js从.csv导入一些数据。我在做这件事时遇到了麻烦，不知道是否有人能帮上忙。我的。csv文件的格式如下:

max_i,min_i,max_f,min_f
-122.1430195,-122.1430195,-122.415278,37.778643
-122.1430195,-122.1430195,-122.40815,37.785034
-122.4194155,-122.4194155,-122.4330827,37.7851673
-122.4194155,-122.4194155,-122.4330827,37.7851673
-118.4911912,-118.4911912,-118.3672828,33.9164666
-121.8374777,-121.8374777,-121.8498415,39.7241178
-115.172816,-115.172816,-115.078011,36.1586877
-82.5618186,-82.5618186,-79.2274115,37.9308282
-79.9958864,-79.9958864,-80.260396,40.1787544
-74.1243063,-74.1243063,-74.040948,40.729688
-106.609991,-106.609991,-106.015897,35.640949

我正在尝试使用以下代码加载数据:

var dataset = []
d3.csv("data.csv", function(data) {
   dataset = data.map(function(d) { return [ +d["max_i"], +d["min_i"] ]; });
});
console.log(dataset)

然而，我在控制台中只得到一个空的[]。有人能指出我的错误吗?

改为:

var dataset = []
d3.csv("data.csv", function(data) {
   dataset = data.map(function(d) { return [ +d["max_i"], +d["min_i"] ]; });
   console.log(dataset)
});

你需要在回调中检查数据集，一旦你的数据返回。

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