114 lines
3.9 KiB
Markdown
114 lines
3.9 KiB
Markdown
---
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id: 587d7faa367417b2b2512bd6
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title: Add a Tooltip to a D3 Element
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required:
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- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
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challengeType: 6
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---
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## Description
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<section id='description'>
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A tooltip shows more information about an item on a page when the user hovers over that item. There are several ways to add a tooltip to a visualization, this challenge uses the SVG <code>title</code> element.
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<code>title</code> pairs with the <code>text()</code> method to dynamically add data to the bars.
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</section>
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## Instructions
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<section id='instructions'>
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Append a <code>title</code> element under each <code>rect</code> node. Then call the <code>text()</code> method with a callback function so the text displays the data value.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: Your code should have 9 <code>title</code> elements.
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testString: 'assert($("title").length == 9, "Your code should have 9 <code>title</code> elements.");'
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- text: The first <code>title</code> element should have tooltip text of 12.
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testString: 'assert($("title").eq(0).text() == "12", "The first <code>title</code> element should have tooltip text of 12.");'
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- text: The second <code>title</code> element should have tooltip text of 31.
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testString: 'assert($("title").eq(1).text() == "31", "The second <code>title</code> element should have tooltip text of 31.");'
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- text: The third <code>title</code> element should have tooltip text of 22.
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testString: 'assert($("title").eq(2).text() == "22", "The third <code>title</code> element should have tooltip text of 22.");'
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- text: The fourth <code>title</code> element should have tooltip text of 17.
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testString: 'assert($("title").eq(3).text() == "17", "The fourth <code>title</code> element should have tooltip text of 17.");'
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- text: The fifth <code>title</code> element should have tooltip text of 25.
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testString: 'assert($("title").eq(4).text() == "25", "The fifth <code>title</code> element should have tooltip text of 25.");'
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- text: The sixth <code>title</code> element should have tooltip text of 18.
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testString: 'assert($("title").eq(5).text() == "18", "The sixth <code>title</code> element should have tooltip text of 18.");'
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- text: The seventh <code>title</code> element should have tooltip text of 29.
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testString: 'assert($("title").eq(6).text() == "29", "The seventh <code>title</code> element should have tooltip text of 29.");'
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- text: The eighth <code>title</code> element should have tooltip text of 14.
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testString: 'assert($("title").eq(7).text() == "14", "The eighth <code>title</code> element should have tooltip text of 14.");'
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- text: The ninth <code>title</code> element should have tooltip text of 9.
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testString: 'assert($("title").eq(8).text() == "9", "The ninth <code>title</code> element should have tooltip text of 9.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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.bar:hover {
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fill: brown;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - 3 * d)
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.attr("width", 25)
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.attr("height", (d, i) => d * 3)
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.attr("fill", "navy")
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.attr("class", "bar")
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// Add your code below this line
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// Add your code above this line
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.text((d) => d)
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - (d * 3 + 3))
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</script>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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