79 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			79 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | |||
|  | id: 587d7fa8367417b2b2512bcd | |||
|  | title: Create a Bar for Each Data Point in the Set | |||
|  | challengeType: 6 | |||
|  | videoUrl: '' | |||
|  | localeTitle: 为集合中的每个数据点创建一个条 | |||
|  | --- | |||
|  | 
 | |||
|  | ## Description
 | |||
|  | <section id="description">最后一个挑战只在<code>svg</code>元素中添加了一个矩形来表示一个条形。在这里,您将结合您迄今为止学习的有关<code>data()</code> , <code>enter()</code>和SVG形状的内容,为数据<code>dataset</code>每个数据点创建和附加一个矩形。之前的挑战显示了如何为<code>dataset</code>每个项目创建和附加<code>div</code>的格式: <blockquote> d3.select( “身体”)。全选( “分区”) <br> 。数据(数据集) <br> 。输入() <br> .append( “分区”) </blockquote>使用<code>rect</code>元素而不是<code>divs</code>有一些差异。 <code>rects</code>必须附加到<code>svg</code>元素,而不是直接附加到<code>body</code> 。此外,您需要告诉D3在<code>svg</code>区域内放置每个<code>rect</code>位置。酒吧安置将在下一个挑战中涵盖。 </section> | |||
|  | 
 | |||
|  | ## Instructions
 | |||
|  | <section id="instructions">使用<code>data()</code> , <code>enter()</code>和<code>append()</code>方法为<code>dataset</code>每个项创建和附加<code>rect</code> 。条形图应该全部显示在一起,这将在下一个挑战中修复。 </section> | |||
|  | 
 | |||
|  | ## Tests
 | |||
|  | <section id='tests'> | |||
|  | 
 | |||
|  | ```yml | |||
|  | tests: | |||
|  |   - text: 您的文档应该有9个<code>rect</code>元素。 | |||
|  |     testString: 'assert($("rect").length == 9, "Your document should have 9 <code>rect</code> elements.");' | |||
|  |   - text: 您的代码应该使用<code>data()</code>方法。 | |||
|  |     testString: 'assert(code.match(/\.data/g), "Your code should use the <code>data()</code> method.");' | |||
|  |   - text: 您的代码应使用<code>enter()</code>方法。 | |||
|  |     testString: 'assert(code.match(/\.enter/g), "Your code should use the <code>enter()</code> method.");' | |||
|  |   - text: 您的代码应使用<code>append()</code>方法。 | |||
|  |     testString: 'assert(code.match(/\.append/g), "Your code should use the <code>append()</code> method.");' | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Challenge Seed
 | |||
|  | <section id='challengeSeed'> | |||
|  | 
 | |||
|  | <div id='html-seed'> | |||
|  | 
 | |||
|  | ```html | |||
|  | <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") | |||
|  |        // Add your code below this line | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  |        // Add your code above this line | |||
|  |        .attr("x", 0) | |||
|  |        .attr("y", 0) | |||
|  |        .attr("width", 25) | |||
|  |        .attr("height", 100); | |||
|  |   </script> | |||
|  | </body> | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </div> | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Solution
 | |||
|  | <section id='solution'> | |||
|  | 
 | |||
|  | ```js | |||
|  | // solution required | |||
|  | ``` | |||
|  | </section> |