101 lines
3.9 KiB
Markdown
101 lines
3.9 KiB
Markdown
---
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id: 5a24c314108439a4d4036182
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title: Add Inline Styles in React
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challengeType: 6
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isRequired: false
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forumTopicId: 301378
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---
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## Description
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<section id='description'>
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You may have noticed in the last challenge that there were several other syntax differences from HTML inline styles in addition to the <code>style</code> attribute set to a JavaScript object. First, the names of certain CSS style properties use camel case. For example, the last challenge set the size of the font with <code>fontSize</code> instead of <code>font-size</code>. Hyphenated words like <code>font-size</code> are invalid syntax for JavaScript object properties, so React uses camel case. As a rule, any hyphenated style properties are written using camel case in JSX.
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All property value length units (like <code>height</code>, <code>width</code>, and <code>fontSize</code>) are assumed to be in <code>px</code> unless otherwise specified. If you want to use <code>em</code>, for example, you wrap the value and the units in quotes, like <code>{fontSize: "4em"}</code>. Other than the length values that default to <code>px</code>, all other property values should be wrapped in quotes.
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</section>
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## Instructions
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<section id='instructions'>
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If you have a large set of styles, you can assign a style <code>object</code> to a constant to keep your code organized. Uncomment the <code>styles</code> constant and declare an <code>object</code> with three style properties and their values. Give the <code>div</code> a color of <code>"purple"</code>, a font-size of <code>40</code>, and a border of <code>"2px solid purple"</code>. Then set the <code>style</code> attribute equal to the <code>styles</code> constant.
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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: The <code>styles</code> variable should be an <code>object</code> with three properties.
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testString: assert(Object.keys(styles).length === 3);
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- text: The <code>styles</code> variable should have a <code>color</code> property set to a value of <code>purple</code>.
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testString: assert(styles.color === 'purple');
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- text: The <code>styles</code> variable should have a <code>fontSize</code> property set to a value of <code>40</code>.
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testString: assert(styles.fontSize === 40);
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- text: The <code>styles</code> variable should have a <code>border</code> property set to a value of <code>2px solid purple</code>.
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testString: assert(styles.border === "2px solid purple");
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- text: The component should render a <code>div</code> element.
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testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return mockedComponent.type() === 'div'; })());
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- text: The <code>div</code> element should have its styles defined by the <code>styles</code> object.
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testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return (mockedComponent.props().style.color === "purple" && mockedComponent.props().style.fontSize === 40 && mockedComponent.props().style.border === "2px solid purple"); })());
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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='jsx-seed'>
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```jsx
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// const styles =
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// change code above this line
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class Colorful extends React.Component {
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render() {
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// change code below this line
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return (
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<div style={{color: "yellow", fontSize: 24}}>Style Me!</div>
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);
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// change code above this line
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}
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};
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```
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</div>
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### After Test
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<div id='jsx-teardown'>
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```js
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ReactDOM.render(<Colorful />, document.getElementById('root'))
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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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const styles = {
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color: "purple",
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fontSize: 40,
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border: "2px solid purple"
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};
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// change code above this line
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class Colorful extends React.Component {
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render() {
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// change code below this line
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return (
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<div style={styles}>Style Me!</div>
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// change code above this line
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);
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}
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};
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```
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</section>
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