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HTML

            
              <!DOCTYPE html>
<html>
	<body>
		<script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>
	</body>
</html>
            
          
!

CSS

            
              * {
	box-sizing: border-box;
	font-family: helvetica;
}

html, body {
	margin: 0;
	width: 100vw;
	height: 100vh;
	display: grid;
	place-items: center;	
	background-color: hsl(0, 0%, 30%);
	color: hsl(0, 0%, 10%);
}

#svg-container {
	background-color: hsl(0, 0%, 100%);
	margin: 1rem;
	border-radius: .1rem;
}

.tooltips  {		
    font-size: 20px;		
}
            
          
!

JS

            
              //This is the main ajax call to start the app
//takes a url and mehtodtype and returns a promise
window.onload = () => {
	function ajaxCall(url, methodType) {
		let promObj = new Promise((res, rej) => {
			const xhr = new XMLHttpRequest();
			xhr.open(methodType, url, true);
			xhr.send();
			xhr.onload = () => {
				if(xhr.readyState === 4) {
					if(xhr.status === 200) {
						let resp = xhr.responseText;
						let respJson = JSON.parse(resp);
						res(respJson);
					} else {
						rej(xhr.status);
					}
				}
			}
		});
			return promObj;
	}

	let URL = 'https://raw.githubusercontent.com/freeCodeCamp/ProjectReferenceData/master/GDP-data.json';


	//calls the makeSVG function after it get the data from the url
	ajaxCall(URL, 'GET').then(makeSVG);

	function makeSVG(dataset) {
		//map over gdp numbers 
		const gdps = dataset.data.map((arr) => {
						return arr[1];
					});

		//vars for the SVG elements
		const svgWidth = 900,
					svgHeight = 500,
					padding = 20,
					dataMin = d3.min(gdps),
					dataMax = d3.max(gdps),
					dataLength = dataset.data.length,
					dates = dataset.data.map((x) => {
						return new Date(x[0] + 'T00:00:00');
					}),
					minDate = d3.min(dates),
					maxDate = d3.max(dates);
		//yScale for the GDP
		const yScale = d3.scaleLinear()
											.domain([0, dataMax])
											.range([svgHeight, 50]);
		const yAxis = d3.axisLeft(yScale).tickSizeOuter(0);
		

		//xScale for the year timeScale
		const xScale = d3.scaleTime()
											// input data
											.domain([minDate, maxDate])
											// output data
											.range([50, svgWidth - 50]);
		
		const xAxis = d3.axisBottom(xScale).tickSizeOuter(0);
		
		//This is the main SVG container stored in an const named svg on the 'body' element
		const svg = d3.select('body')
		.append('svg')
		.attr('id', 'svg-container')
		.attr('width', svgWidth)
		.attr('height', svgHeight)
		.style('filter', 'drop-shadow( 0 5px 5px black)');

		//This is the text at the top of the svg to show what the data is for
		//A text element is appended to the SVG element
		svg.append('text')
			.attr('x', 250)
			.attr('y', 50)
			.attr('id', 'title')
			.style('font-size', "40px")
			.style("text-decoration", "underline") 
			.text('United States - GDP');
		
			//Create the toolTip
		let toolTipDate = svg.append('text')
				.attr('class', 'tooltips')
				.attr('id', 'tooltip')
				.attr('x', 250)
				.attr('y', 300)
				.style('opacity', 0);
		
		let toolTipGDP = svg.append('text')
				.attr('class', 'tooltips')
				.attr('x', 250)
				.attr('y', 320)
				.style('opacity', 0);

		//all rect elements
		svg.selectAll('rect')
			.data(dataset.data)
			.enter()
			.append('rect')
			.attr('data-date', (d, i) => {
			return d[0];
		})
			.attr('data-gdp', (d, i) => {
			return d[1];
		})
			.attr('x', (d, i) => {
			return xScale(new Date(d[0] + 'T00:00:00'));
		})
			.attr('y', (d, i) => {
			return yScale(d[1]) - 35;
		})
			.attr('width', (svgWidth - 100) / dataLength)
			.attr('height', (d, i) => {
			return (svgHeight) - yScale(d[1]);
		})
			.attr('fill', '#333333')
			.attr('class', 'bar')
			.on('mouseover', handleMouseOver)
			.on('mouseout', handleMouseOut);
	
	// Format date yyyy-mm-dd -> dd/mm/yyyy
		function formatDate(date) {
				let d = new Date(date),
						day = d.getUTCDate(),
						month = d.getUTCMonth() + 1,
						year = d.getUTCFullYear();
				return `Date: ${day}-${month}-${year}`;
				
			}

		//Make rect color white when mouse hovers
		function handleMouseOver(d, i) {
			d3.select(this).style('fill', '#ffce21');


			toolTipDate.attr('data-date', d[0])
			.text(formatDate(d[0]))
			.style('opacity', 1);;
						 		// .text(formatDate(d[0]));
			toolTipGDP.text(`$${d[1]} Billion`)
			.style('opacity', 1);;
			
		}

		//change rect back to blue color when mouse leaves
		//and remove #tooltip 
		function handleMouseOut(d, i) {
			d3.select(this).style('fill', '#333333');
			toolTipDate.style('opacity', 0);
			toolTipGDP.style('opacity', 0);
		}
		//add the yAxis to a 'g' element
		svg.append('g')
			.attr('id', 'y-axis')
			.attr('transform', 'translate(' +
						50 + ',' + -35 +')')
			.call(yAxis);

		//add the xAxis to a 'g' element
		svg.append('g')
			.attr('id', 'x-axis')
			.attr('transform', 'translate(' +
						0 + ',' + 465 +')')
			.call(xAxis);

	}
}







            
          
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