3.5 KiB
3.5 KiB
id | title | challengeType | isRequired |
---|---|---|---|
5a24c314108439a4d4036181 | Introducing Inline Styles | 6 | false |
Description
className
attribute, and apply styles to the class in your stylesheet. Another option is to apply inline styles, which are very common in ReactJS development.
You apply inline styles to JSX elements similar to how you do it in HTML, but with a few JSX differences. Here's an example of an inline style in HTML:
<div style="color: yellow; font-size: 16px">Mellow Yellow</div>
JSX elements use the style
attribute, but because of the way JSX is transpiled, you can't set the value to a string
. Instead, you set it equal to a JavaScript object
. Here's an example:
<div style={{color: "yellow", fontSize: 16}}>Mellow Yellow</div>
Notice how we camelCase the "fontSize" property? This is because React will not accept kebab-case keys in the style object. React will apply the correct property name for us in the HTML.
Instructions
style
attribute to the div
in the code editor to give the text a color of red and font size of 72px.
Note that you can optionally set the font size to be a number, omitting the units "px", or write it as "72px".
Tests
tests:
- text: The component should render a <code>div</code> element.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().type() === 'div'; })(), 'The component should render a <code>div</code> element.');
- text: The <code>div</code> element should have a color of <code>red</code>.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return mockedComponent.children().props().style.color === 'red'; })(), 'The <code>div</code> element should have a color of <code>red</code>.');
- text: The <code>div</code> element should have a font size of <code>72px</code>.
testString: assert((function() { const mockedComponent = Enzyme.mount(React.createElement(Colorful)); return (mockedComponent.children().props().style.fontSize === 72 || mockedComponent.children().props().style.fontSize === '72' || mockedComponent.children().props().style.fontSize === '72px'); })(), 'The <code>div</code> element should have a font size of <code>72px</code>.');
Challenge Seed
class Colorful extends React.Component {
render() {
return (
<div>Big Red</div>
);
}
};
After Test
ReactDOM.render(<Colorful />, document.getElementById('root'))
Solution
class Colorful extends React.Component {
render() {
return (
<div style={{color: "red", fontSize: 72}}>Big Red</div>
);
}
};