98 lines
2.9 KiB
Markdown
98 lines
2.9 KiB
Markdown
---
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id: 587d7fa8367417b2b2512bcb
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title: Learn About SVG in D3
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challengeType: 6
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forumTopicId: 301489
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---
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## Description
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<section id='description'>
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<dfn>SVG</dfn> stands for <dfn>Scalable Vector Graphics</dfn>.
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Here "scalable" means that, if you zoom in or out on an object, it would not appear pixelated. It scales with the display system, whether it's on a small mobile screen or a large TV monitor.
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SVG is used to make common geometric shapes. Since D3 maps data into a visual representation, it uses SVG to create the shapes for the visualization. SVG shapes for a web page must go within an HTML <code>svg</code> tag.
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CSS can be scalable when styles use relative units (such as <code>vh</code>, <code>vw</code>, or percentages), but using SVG is more flexible to build data visualizations.
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</section>
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## Instructions
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<section id='instructions'>
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Add an <code>svg</code> node to the <code>body</code> using <code>append()</code>. Give it a <code>width</code> attribute set to the provided <code>w</code> constant and a <code>height</code> attribute set to the provided <code>h</code> constant using the <code>attr()</code> or <code>style()</code> methods for each. You'll see it in the output because there's a <code>background-color</code> of pink applied to it in the <code>style</code> tag.
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<strong>Note</strong><br>When using <code>attr()</code> width and height attributes do not have units. This is the building block of scaling - the element will always have a 5:1 width to height ratio, no matter what the zoom level is.
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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 document should have 1 <code>svg</code> element.
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testString: assert($('svg').length == 1);
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- text: The <code>svg</code> element should have a <code>width</code> attribute set to 500 or styled to have a width of 500px.
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testString: assert($('svg').attr('width') == '500'||$('svg').css('width') == '500px');
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- text: The <code>svg</code> element should have a <code>height</code> attribute set to 100 or styled to have a height of 100px.
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testString: assert($('svg').attr('height') == '100'||$('svg').css('height') == '100px');
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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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svg {
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background-color: pink;
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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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// 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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```html
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<style>
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svg {
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background-color: pink;
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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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</script>
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</body>
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```
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</section>
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