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4.4 KiB
4.4 KiB
title, impact, impactDescription, type, tags
| title | impact | impactDescription | type | tags | ||||
|---|---|---|---|---|---|---|---|---|
| Use withDirectives for Custom Directives in Render Functions | LOW | Custom directives require special handling with withDirectives helper | best-practice |
|
Use withDirectives for Custom Directives in Render Functions
Impact: LOW - To apply custom directives to vnodes in render functions, use the withDirectives helper. Attempting to apply directives through props or other means will not work.
The withDirectives function wraps a vnode and applies directives with their values, arguments, and modifiers.
Task Checklist
- Import
withDirectivesfrom 'vue' when using custom directives - Import or define the directive object
- Pass directive as array:
[directive, value, argument, modifiers] - Multiple directives can be applied at once
Incorrect:
import { h } from 'vue'
const vFocus = { mounted: (el) => el.focus() }
export default {
setup() {
return () => {
// WRONG: Directives don't work as props
return h('input', {
'v-focus': true // This doesn't work
})
}
}
}
Correct:
import { h, withDirectives } from 'vue'
// Custom directive
const vFocus = {
mounted: (el) => el.focus()
}
export default {
setup() {
return () => {
// CORRECT: Use withDirectives
return withDirectives(
h('input'),
[[vFocus]] // Array of directive tuples
)
}
}
}
Directive with Value, Argument, and Modifiers
The directive tuple format: [directive, value, argument, modifiers]
import { h, withDirectives, resolveDirective } from 'vue'
// Directive definition
// Usage in template: <div v-pin:top.animate="200">
const vPin = {
mounted(el, binding) {
console.log(binding.value) // 200
console.log(binding.arg) // 'top'
console.log(binding.modifiers) // { animate: true }
el.style.position = 'fixed'
el.style[binding.arg] = binding.value + 'px'
}
}
export default {
setup() {
return () => withDirectives(
h('div', 'Pinned content'),
[
// [directive, value, argument, modifiers]
[vPin, 200, 'top', { animate: true }]
]
)
}
}
Multiple Directives
import { h, withDirectives } from 'vue'
const vFocus = { mounted: (el) => el.focus() }
const vTooltip = {
mounted(el, { value }) {
el.title = value
}
}
export default {
setup() {
return () => withDirectives(
h('input', { placeholder: 'Enter text' }),
[
[vFocus],
[vTooltip, 'This is a tooltip']
]
)
}
}
Using Registered Directives
For globally or locally registered directives, use resolveDirective:
import { h, withDirectives, resolveDirective } from 'vue'
// Assuming v-focus and v-tooltip are registered globally
export default {
setup() {
return () => {
const focus = resolveDirective('focus')
const tooltip = resolveDirective('tooltip')
return withDirectives(
h('input'),
[
[focus],
[tooltip, 'Helpful tip']
]
)
}
}
}
Practical Example: Click Outside Directive
import { h, withDirectives, ref } from 'vue'
const vClickOutside = {
mounted(el, binding) {
el._clickOutside = (event) => {
if (!el.contains(event.target)) {
binding.value(event)
}
}
document.addEventListener('click', el._clickOutside)
},
unmounted(el) {
document.removeEventListener('click', el._clickOutside)
}
}
export default {
setup() {
const isOpen = ref(true)
const closeDropdown = () => { isOpen.value = false }
return () => isOpen.value
? withDirectives(
h('div', { class: 'dropdown' }, 'Dropdown content'),
[[vClickOutside, closeDropdown]]
)
: null
}
}
JSX with Directives
Directives in JSX also require withDirectives:
import { withDirectives } from 'vue'
const vFocus = { mounted: (el) => el.focus() }
export default {
setup() {
return () => withDirectives(
<input placeholder="Search..." />,
[[vFocus]]
)
}
}