2018-10-10 18:03:03 -04:00
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---
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id: 587d7faa367417b2b2512bd6
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title: Add a Tooltip to a D3 Element
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challengeType: 6
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videoUrl: ''
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localeTitle: 将工具提示添加到D3元素
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---
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## Description
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<section id="description">当用户将鼠标悬停在该项目上时，工具提示会显示有关页面上项目的更多信息。有几种方法可以向可视化添加工具提示，此挑战使用SVG <code>title</code>元素。 <code>title</code>对与<code>text()</code>方法一起动态地向条形图添加数据。 </section>
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## Instructions
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<section id="instructions">在每个<code>rect</code>节点下附加<code>title</code>元素。然后使用回调函数调用<code>text()</code>方法，以便文本显示数据值。 </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: 您的代码应该有9个<code>title</code>元素。
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testString: assert($('title').length == 9);
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- text: 第一个<code>title</code>元素的工具提示文本应为12。
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testString: assert($('title').eq(0).text() == '12');
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- text: 第二个<code>title</code>元素的工具提示文本应为31。
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testString: assert($('title').eq(1).text() == '31');
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- text: 第三个<code>title</code>元素的工具提示文本应为22。
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testString: assert($('title').eq(2).text() == '22');
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- text: 第四个<code>title</code>元素的工具提示文本应为17。
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testString: assert($('title').eq(3).text() == '17');
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- text: 第五个<code>title</code>元素的工具提示文本应为25。
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testString: assert($('title').eq(4).text() == '25');
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- text: 第六个<code>title</code>元素的工具提示文本应为18。
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testString: assert($('title').eq(5).text() == '18');
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- text: 第七个<code>title</code>元素的工具提示文本应为29。
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testString: assert($('title').eq(6).text() == '29');
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- text: 第八个<code>title</code>元素的工具提示文本应为14。
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testString: assert($('title').eq(7).text() == '14');
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- text: 第九个<code>title</code>元素的工具提示文本应为9。
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testString: assert($('title').eq(8).text() == '9');
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2018-10-10 18:03:03 -04:00
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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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