我試圖設置一個簡單的條形圖使用D3版本4.x.x但是,我相信我正在做的一切正確,但似乎無法得到rects顯示。我附上了一個codepen來看看這個。D3 Rect元素不顯示
非常感謝您提前解決這個問題,因爲我是D3的新手。 http://codepen.io/PizzaPokerGuy/pen/XpoJxG?editors=0111
enter code here//Width of svg, will be used again down the road
const width = 1000;
//Height of svg, will be used again down the road
const height = 800;
//Padding so things have room to be displayed within svg
const padding = 60;
//Create our SVG container
var svg = d3.select("body")
.append('svg')
.attr("width", width)
.attr("height", height);
//JSON Enter data
var data = d3.json('https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/mast er/GDP-data.json',
(error, data) => {
var chartData = data.data;
//Stores barWidth variable, math.ciel rounds up, used to set an equal width for each rect
var barWidth = Math.ceil((width - padding)/chartData.length);
//Define xScale
const xScale = d3.scaleLinear()
.domain([0, d3.max(chartData, (d) => d[0])])
.range([padding, width - padding]);
//Define yScale
const yScale = d3.scaleLinear()
.domain([0, d3.max(chartData, (d) => d[1])])
.range([height - padding, padding]);
//Selects SVG elements and selects all rect elements within it
svg.selectAll("rect")
//Adds data to use later
.data(chartData)
//Allows us to add items to the dom if data is larger than ammoutn of rect elements selected
.enter()
//Adds rect element
.append("rect")
//Adds x attribute to x based off of d(chartData), need to create a date as a string is not enough
.attr("x", (d) => xScale(new Date(d[0])))
//Sets y attribute of rectangle
.attr("y", (d) => yScale(d[1]))
//Sets height, we minus the value from height to invert the bars
.attr("height", (d) => height - yScale(d[1]))
//sets width of rect elements
.attr("width", barWidth)
//fill in color of rects
.attr("fill", "black");
});
非常感謝。這解決了我的問題。這很有道理。 – user2872518