91 lines
3.6 KiB
Markdown
91 lines
3.6 KiB
Markdown
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---
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id: 587d7fa8367417b2b2512bc9
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title: Update the Height of an Element Dynamically
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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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videoUrl: ''
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localeTitle: 动态更新元素的高度
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---
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## Description
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<section id="description">之前的挑战包括如何显示数组中的数据以及如何添加CSS类。您可以结合这些课程来创建简单的条形图。这有两个步骤：1）为数组中的每个数据点创建一个<code>div</code> 2）使用<code>style()</code>方法中的回调函数给每个<code>div</code>一个动态高度，该函数将高度设置为等于数据值。回想一下格式为使用回调函数设置样式： <code>selection.style("cssProperty", (d) => d)</code> </section>
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## Instructions
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<section id="instructions">将<code>style()</code>方法添加到编辑器中的代码中，以设置每个元素的<code>height</code>属性。使用回调函数返回数据点的值，并添加字符串“px”。 </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: 第一个<code>div</code>的<code>height</code>应为12像素。
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testString: 'assert($("div").eq(0).css("height") == "12px", "The first <code>div</code> should have a <code>height</code> of 12 pixels.");'
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- text: 第二个<code>div</code>的<code>height</code>应为31像素。
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testString: 'assert($("div").eq(1).css("height") == "31px", "The second <code>div</code> should have a <code>height</code> of 31 pixels.");'
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- text: 第三个<code>div</code>的<code>height</code>应为22像素。
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testString: 'assert($("div").eq(2).css("height") == "22px", "The third <code>div</code> should have a <code>height</code> of 22 pixels.");'
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- text: 第四个<code>div</code>的<code>height</code>应为17像素。
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testString: 'assert($("div").eq(3).css("height") == "17px", "The fourth <code>div</code> should have a <code>height</code> of 17 pixels.");'
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- text: 第五个<code>div</code>的<code>height</code>应为25像素。
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testString: 'assert($("div").eq(4).css("height") == "25px", "The fifth <code>div</code> should have a <code>height</code> of 25 pixels.");'
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- text: 第六个<code>div</code>的<code>height</code>应为18像素。
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testString: 'assert($("div").eq(5).css("height") == "18px", "The sixth <code>div</code> should have a <code>height</code> of 18 pixels.");'
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- text: 第七个<code>div</code>的<code>height</code>应为29像素。
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testString: 'assert($("div").eq(6).css("height") == "29px", "The seventh <code>div</code> should have a <code>height</code> of 29 pixels.");'
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- text: 第八个<code>div</code>的<code>height</code>应为14像素。
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testString: 'assert($("div").eq(7).css("height") == "14px", "The eighth <code>div</code> should have a <code>height</code> of 14 pixels.");'
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- text: 第九个<code>div</code>的<code>height</code>应为9像素。
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testString: 'assert($("div").eq(8).css("height") == "9px", "The ninth <code>div</code> should have a <code>height</code> of 9 pixels.");'
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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 {
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width: 25px;
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height: 100px;
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display: inline-block;
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background-color: blue;
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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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d3.select("body").selectAll("div")
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.data(dataset)
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.enter()
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.append("div")
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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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</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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