b36cdbafd1
* chore: rename part to step * chore: update metas * chore: more renaming * chore: update tooling * chore: update frontmatter * chore(tools): title testing
351 lines
9.0 KiB
Markdown
351 lines
9.0 KiB
Markdown
---
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id: 5d8a4cfbe6b6180ed9a1ca3d
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title: Step 96
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challengeType: 0
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dashedName: step-96
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---
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# --description--
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Add the `enter` function to the current selection. Just like before, the initial selection here has a length of zero and the data has a length of three. So when you append elements in the next step, three will be created; one for each slice of the pie.
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# --hints--
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test-text
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```js
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assert(
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/\.data\(pie\(d3\.entries\(data\[8\]\.followers\)\)\)\s*\.\s*enter\s*\(\s*\)/g.test(
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code
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)
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);
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```
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# --seed--
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## --before-user-code--
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<title>D3 Dashboard</title>
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<style>
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body {
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background-color: #ccc;
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padding: 100px 10px;
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}
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.dashboard {
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width: 980px;
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height: 500px;
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background-color: white;
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box-shadow: 5px 5px 5px 5px #888;
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margin: auto;
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display: flex;
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align-items: center;
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}
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</style>
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</head>
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<body>
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<div class="dashboard"></div>
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</body>
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</html>
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```
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## --seed-contents--
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```html
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<script>
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const data = [
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{ year: 2012, followers: { twitter: 2594, tumblr: 401, instagram: 83 }},
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{ year: 2013, followers: { twitter: 3049, tumblr: 440, instagram: 192 }},
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{ year: 2014, followers: { twitter: 3511, tumblr: 415, instagram: 511 }},
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{ year: 2015, followers: { twitter: 3619, tumblr: 492, instagram: 1014 }},
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{ year: 2016, followers: { twitter: 4046, tumblr: 543, instagram: 2066 }},
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{ year: 2017, followers: { twitter: 3991, tumblr: 701, instagram: 3032 }},
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{ year: 2018, followers: { twitter: 3512, tumblr: 1522, instagram: 4512 }},
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{ year: 2019, followers: { twitter: 3274, tumblr: 1989, instagram: 4715 }},
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{ year: 2020, followers: { twitter: 2845, tumblr: 2040, instagram: 4801 }}
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];
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</script>
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<script>
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const svgMargin = 70,
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svgWidth = 700,
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svgHeight = 500,
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twitterColor = '#7cd9d1',
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tumblrColor = '#f6dd71',
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instagramColor = '#fd9b98';
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const lineGraph = d3.select('.dashboard')
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.append('svg')
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.attr('width', svgWidth)
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.attr('height', svgHeight);
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const yScale = d3.scaleLinear()
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.domain([0, 5000])
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.range([svgHeight - svgMargin, svgMargin]);
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const xScale = d3.scaleLinear()
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.domain([2012, 2020])
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.range([svgMargin, svgWidth - svgMargin]);
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const yAxis = d3.axisLeft(yScale)
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.ticks(6, '~s');
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const xAxis = d3.axisBottom(xScale)
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.tickFormat(d3.format(''))
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.tickPadding(10);
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lineGraph.append('g')
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.call(yAxis)
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.attr('transform', `translate(${svgMargin}, 0)`)
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.style('font', '10px verdana');
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lineGraph.append('g')
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.call(xAxis)
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.attr('transform', `translate(0, ${svgHeight - svgMargin})`)
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.selectAll('text')
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.style('transform', 'translate(-12px, 0) rotate(-50deg)')
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.style('text-anchor', 'end')
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.style('cursor', 'pointer')
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.style('font', '10px verdana')
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const twitterLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.twitter));
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lineGraph.append('path')
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.attr('d', twitterLine(data))
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.attr('stroke', twitterColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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const tumblrLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.tumblr));
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lineGraph.append('path')
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.attr('d', tumblrLine(data))
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.attr('stroke', tumblrColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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const instagramLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.instagram));
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lineGraph.append('path')
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.attr('d', instagramLine(data))
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.attr('stroke', instagramColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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lineGraph.selectAll('twitter-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.twitter))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', twitterColor)
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.style('cursor', 'pointer')
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lineGraph.selectAll('tumblr-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.tumblr))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', tumblrColor)
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.style('cursor', 'pointer')
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lineGraph.selectAll('instagram-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.instagram))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', instagramColor)
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.style('cursor', 'pointer')
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const rightDashboard = d3.select('.dashboard')
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.append('div');
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const pieGraph = rightDashboard.append('svg')
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.attr('width', 200)
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.attr('height', 200)
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const pieArc = d3.arc()
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.outerRadius(100)
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.innerRadius(0);
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const pieColors = d3.scaleOrdinal()
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.domain(data[8].followers)
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.range([twitterColor, tumblrColor, instagramColor]);
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const pie = d3.pie()
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.value(d => d.value);
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const pieGraphData = pieGraph.selectAll('pieSlices')
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.data(pie(d3.entries(data[8].followers)))
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</script>
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```
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# --solutions--
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```html
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<script>
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const data = [
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{ year: 2012, followers: { twitter: 2594, tumblr: 401, instagram: 83 }},
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{ year: 2013, followers: { twitter: 3049, tumblr: 440, instagram: 192 }},
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{ year: 2014, followers: { twitter: 3511, tumblr: 415, instagram: 511 }},
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{ year: 2015, followers: { twitter: 3619, tumblr: 492, instagram: 1014 }},
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{ year: 2016, followers: { twitter: 4046, tumblr: 543, instagram: 2066 }},
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{ year: 2017, followers: { twitter: 3991, tumblr: 701, instagram: 3032 }},
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{ year: 2018, followers: { twitter: 3512, tumblr: 1522, instagram: 4512 }},
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{ year: 2019, followers: { twitter: 3274, tumblr: 1989, instagram: 4715 }},
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{ year: 2020, followers: { twitter: 2845, tumblr: 2040, instagram: 4801 }}
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];
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</script>
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<script>
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const svgMargin = 70,
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svgWidth = 700,
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svgHeight = 500,
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twitterColor = '#7cd9d1',
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tumblrColor = '#f6dd71',
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instagramColor = '#fd9b98';
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const lineGraph = d3.select('.dashboard')
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.append('svg')
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.attr('width', svgWidth)
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.attr('height', svgHeight);
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const yScale = d3.scaleLinear()
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.domain([0, 5000])
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.range([svgHeight - svgMargin, svgMargin]);
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const xScale = d3.scaleLinear()
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.domain([2012, 2020])
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.range([svgMargin, svgWidth - svgMargin]);
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const yAxis = d3.axisLeft(yScale)
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.ticks(6, '~s');
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const xAxis = d3.axisBottom(xScale)
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.tickFormat(d3.format(''))
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.tickPadding(10);
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lineGraph.append('g')
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.call(yAxis)
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.attr('transform', `translate(${svgMargin}, 0)`)
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.style('font', '10px verdana');
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lineGraph.append('g')
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.call(xAxis)
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.attr('transform', `translate(0, ${svgHeight - svgMargin})`)
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.selectAll('text')
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.style('transform', 'translate(-12px, 0) rotate(-50deg)')
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.style('text-anchor', 'end')
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.style('cursor', 'pointer')
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.style('font', '10px verdana')
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const twitterLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.twitter));
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lineGraph.append('path')
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.attr('d', twitterLine(data))
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.attr('stroke', twitterColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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const tumblrLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.tumblr));
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lineGraph.append('path')
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.attr('d', tumblrLine(data))
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.attr('stroke', tumblrColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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const instagramLine = d3.line()
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.x(d => xScale(d.year))
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.y(d => yScale(d.followers.instagram));
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lineGraph.append('path')
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.attr('d', instagramLine(data))
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.attr('stroke', instagramColor)
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.attr('stroke-width', 3)
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.attr('fill', 'transparent');
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lineGraph.selectAll('twitter-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.twitter))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', twitterColor)
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.style('cursor', 'pointer')
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lineGraph.selectAll('tumblr-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.tumblr))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', tumblrColor)
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.style('cursor', 'pointer')
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lineGraph.selectAll('instagram-circles')
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.data(data)
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.enter()
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.append('circle')
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.attr('cx', d => xScale(d.year))
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.attr('cy', d => yScale(d.followers.instagram))
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.attr('r', 6)
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.attr('fill', 'white')
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.attr('stroke', instagramColor)
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.style('cursor', 'pointer')
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const rightDashboard = d3.select('.dashboard')
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.append('div');
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const pieGraph = rightDashboard.append('svg')
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.attr('width', 200)
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.attr('height', 200)
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const pieArc = d3.arc()
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.outerRadius(100)
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.innerRadius(0);
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const pieColors = d3.scaleOrdinal()
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.domain(data[8].followers)
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.range([twitterColor, tumblrColor, instagramColor]);
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const pie = d3.pie()
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.value(d => d.value);
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const pieGraphData = pieGraph.selectAll('pieSlices')
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.data(pie(d3.entries(data[8].followers)))
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.enter()
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</script>
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```
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