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freecodecamp-projects/4-data-visualization/1-bar-chart/index.js

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2022-10-23 14:09:09 +00:00
const w = 800
const h = 400
d3.json('https://raw.githubusercontent.com/FreeCodeCamp/ProjectReferenceData/master/GDP-data.json')
.then(data => {
const dataset = data.data
d3.select('#chart')
.append('svg')
.attr('height', h)
.attr('width', w)
function getDate(d) {
console.log(d, new Date(d[0]))
return new Date(d[0]);
}
const xScale = d3.scaleTime()
.domain([getDate(dataset[0]), getDate(dataset[dataset.length - 1])])
.range([0, w])
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h, 0])
const xAxis = d3.axisBottom().scale(xScale);
const yAxis = d3.axisLeft().scale(yScale);
d3.select('svg')
.append('g')
.call(xAxis)
.attr('id', 'x-axis')
.attr('transform', 'translate(40, 360)')
d3.select('svg')
.append('g')
.call(yAxis)
.attr('id', 'y-axis')
.attr('transform', 'translate(40, -40)')
d3.select('svg')
.selectAll('rect')
.data(dataset)
.enter()
.append('rect')
.attr('class', 'bar')
.attr('x', (d) => xScale(getDate(d)) + 40)
.attr("y", (d) => yScale(d[1]) - 40)
.attr('width', () => w / 275)
.attr("height", (d) => h - yScale(d[1]))
.attr('data-date', (d) => d[0])
.attr('data-gdp', (d) => d[1])
.style('fill', '#74dbf1')
.on('mouseover', (e) => {
const date = e.target.__data__[0]
const value = e.target.__data__[1]
d3.select('#tooltip')
.attr('data-date', date)
.style('display', 'initial')
.text(() => 'Date: ' + date + " GDP: " + value)
})
.on('mouseout', () => {
d3.select('#tooltip')
.style('display', 'none')
})
}
)