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Applying Custom Formatting
In the previous guide we learned how to create custom block types that render chunks of text inside different containers. But Slate allows for more than just "blocks".
In this guide, we'll show you how to add custom formatting options, like bold, italic,
code
or strikethrough.So we start with our app from earlier:
const renderElement = props => {
switch (props.element.type) {
case 'code':
return <CodeElement {...props} />
default:
return <DefaultElement {...props} />
}
}
const initialValue = [
{
type: 'paragraph',
children: [{ text: 'A line of text in a paragraph.' }],
},
]
const App = () => {
const [editor] = useState(() => withReact(createEditor()))
return (
<Slate editor={editor} initialValue={initialValue}>
<Editable
renderElement={renderElement}
onKeyDown={event => {
if (event.key === '`' && event.ctrlKey) {
event.preventDefault()
const [match] = Editor.nodes(editor, {
match: n => n.type === 'code',
})
Transforms.setNodes(
editor,
{ type: match ? 'paragraph' : 'code' },
{ match: n => Editor.isBlock(editor, n) }
)
}
}}
/>
</Slate>
)
}
And now, we'll edit the
onKeyDown
handler to make it so that when you press control-B
, it will add a bold
format to the currently selected text:const initialValue = [
{
type: 'paragraph',
children: [{ text: 'A line of text in a paragraph.' }],
},
]
const App = () => {
const [editor] = useState(() => withReact(createEditor()))
const renderElement = useCallback(props => {
switch (props.element.type) {
case 'code':
return <CodeElement {...props} />
default:
return <DefaultElement {...props} />
}
}, [])
return (
<Slate editor={editor} initialValue={initialValue}>
<Editable
renderElement={renderElement}
onKeyDown={event => {
if (!event.ctrlKey) {
return
}
switch (event.key) {
// When "`" is pressed, keep our existing code block logic.
case '`': {
event.preventDefault()
const [match] = Editor.nodes(editor, {
match: n => n.type === 'code',
})
Transforms.setNodes(
editor,
{ type: match ? 'paragraph' : 'code' },
{ match: n => Editor.isBlock(editor, n) }
)
break
}
// When "B" is pressed, bold the text in the selection.
case 'b': {
event.preventDefault()
Editor.addMark(editor, 'bold', true)
break
}
}
}}
/>
</Slate>
)
}
Unlike the code format from the previous step, which is a block-level format, bold is a character-level format. Slate manages text contained within blocks (or any other element) using "leaves". Slate's character-level formats/styles are called "marks". Adjacent text with the same marks (styles) applied will be grouped within the same "leaf". When we use
addMark
to add our bold mark to the selected text, Slate will automatically break up the "leaves" using the selection boundaries and produce a new "leaf" with the bold mark added.Okay, so we've got the hotkey handler setup... but! If you happen to now try selecting text and hitting
Ctrl-B
, you won't notice any change. That's because we haven't told Slate how to render a "bold" mark.For every format you add, you need to tell Slate how to render it, just like for elements. So let's define a
Leaf
component:// Define a React component to render leaves with bold text.
const Leaf = props => {
return (
<span
{...props.attributes}
style={{ fontWeight: props.leaf.bold ? 'bold' : 'normal' }}
>
{props.children}
</span>
)
}
Pretty familiar, right? Note that it is described with a
span
- This is because all leaves must be an inline element. You can learn more about leaves in the Rendering section.And now, let's tell Slate about that leaf. To do that, we'll pass in the
renderLeaf
prop to our editor.const initialValue = [
{
type: 'paragraph',
children: [{ text: 'A line of text in a paragraph.' }],
},
]
const App = () => {
const [editor] = useState(() => withReact(createEditor()))
const renderElement = useCallback(props => {
switch (props.element.type) {
case 'code':
return <CodeElement {...props} />
default:
return <DefaultElement {...props} />
}
}, [])
// Define a leaf rendering function that is memoized with `useCallback`.
const renderLeaf = useCallback(props => {
return <Leaf {...props} />
}, [])