93 lines
2.1 KiB
Markdown
93 lines
2.1 KiB
Markdown
---
|
||
id: 587d7faa367417b2b2512bd4
|
||
title: Add a Hover Effect to a D3 Element
|
||
required:
|
||
- src: 'https://cdnjs.cloudflare.com/ajax/libs/d3/4.3.0/d3.min.js'
|
||
challengeType: 6
|
||
videoUrl: ''
|
||
localeTitle: 将悬停效果添加到D3元素
|
||
---
|
||
|
||
## Description
|
||
<section id="description">当用户用鼠标悬停在其上时，可以添加突出显示条形的效果。到目前为止，矩形的样式使用内置的D3和SVG方法，但您也可以使用CSS。使用<code>attr()</code>方法在SVG元素上设置CSS类。然后，新类的<code>:hover</code>伪类保存任何悬停效果的样式规则。 </section>
|
||
|
||
## Instructions
|
||
<section id="instructions">使用<code>attr()</code>方法向所有<code>rect</code>元素添加一个<code>bar</code>类。将鼠标悬停在其上时，会将条形的<code>fill</code>颜色更改为棕色。 </section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: 你的<code>rect</code>元素应该有一类<code>bar</code> 。
|
||
testString: 'assert($("rect").attr("class") == "bar", "Your <code>rect</code> elements should have a class of <code>bar</code>.");'
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='html-seed'>
|
||
|
||
```html
|
||
<style>
|
||
.bar:hover {
|
||
fill: brown;
|
||
}
|
||
</style>
|
||
<body>
|
||
<script>
|
||
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
|
||
|
||
const w = 500;
|
||
const h = 100;
|
||
|
||
const svg = d3.select("body")
|
||
.append("svg")
|
||
.attr("width", w)
|
||
.attr("height", h);
|
||
|
||
svg.selectAll("rect")
|
||
.data(dataset)
|
||
.enter()
|
||
.append("rect")
|
||
.attr("x", (d, i) => i * 30)
|
||
.attr("y", (d, i) => h - 3 * d)
|
||
.attr("width", 25)
|
||
.attr("height", (d, i) => 3 * d)
|
||
.attr("fill", "navy")
|
||
// Add your code below this line
|
||
|
||
|
||
|
||
// Add your code above this line
|
||
|
||
svg.selectAll("text")
|
||
.data(dataset)
|
||
.enter()
|
||
.append("text")
|
||
.text((d) => d)
|
||
.attr("x", (d, i) => i * 30)
|
||
.attr("y", (d, i) => h - (3 * d) - 3);
|
||
|
||
</script>
|
||
</body>
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
</section>
|