Component Instance â
INFO
āĻāĻ āĻĒā§āώā§āĻ āĻžāĻāĻŋ āĻ
āύā§āϤāϰā§āύāĻŋāϰā§āĻŽāĻŋāϤ āĻŦā§āĻļāĻŋāώā§āĻā§āϝ āĻāĻŦāĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻĒāĻžāĻŦāϞāĻŋāĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ⧠āĻāύā§āĻŽā§āĻāĻŋāϤ āĻĒāĻĻā§āϧāϤāĻŋāĻā§āϞāĻŋ āύāĻĨāĻŋāĻā§āĻā§āϤ āĻāϰā§, āϝā§āĻŽāύ this
āĨ¤
āĻāĻ āĻĒā§āώā§āĻ āĻžāϝāĻŧ āϤāĻžāϞāĻŋāĻāĻžāĻā§āĻā§āϤ āϏāĻŽāϏā§āϤ āĻŦā§āĻļāĻŋāώā§āĻā§āϝ āĻļā§āϧā§āĻŽāĻžāϤā§āϰ āĻĒāĻ āύāϝā§āĻā§āϝ ($data
-āĻ āύā§āϏā§āĻā§āĻĄ āĻŦā§āĻļāĻŋāώā§āĻā§āϝāĻā§āϞāĻŋ āĻāĻžāĻĄāĻŧāĻž)āĨ¤
$data â
āĻ
āĻŦāĻā§āĻā§āĻāĻāĻŋ data
āĻŦāĻŋāĻāϞā§āĻĒ āĻĨā§āĻā§ āĻĢāĻŋāϰ⧠āĻāϏā§āĻā§, āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻĻā§āĻŦāĻžāϰāĻž āĻĒā§āϰāϤāĻŋāĻā§āϰāĻŋāϝāĻŧāĻžāĻļā§āϞ āĻāϰāĻž āĻšāϝāĻŧā§āĻā§āĨ¤ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ āĻĒā§āϰāĻā§āϏāĻŋ āϤāĻžāϰ āĻĄā§āĻāĻž āĻ
āĻŦāĻā§āĻā§āĻā§āϰ āĻŦā§āĻļāĻŋāώā§āĻā§āϝāĻā§āϞāĻŋāϤ⧠āĻ
ā§āϝāĻžāĻā§āϏā§āϏ āĻāϰā§āĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $data: object }
$props â
āĻāĻŽā§āĻĒā§āύā§āύā§āĻāϏ āĻŦāϰā§āϤāĻŽāĻžāύ, āϏāĻŽāĻžāϧāĻžāύ āĻāϰāĻž āĻĒā§āϰāĻĒāϏ āĻĒā§āϰāϤāĻŋāύāĻŋāϧāĻŋāϤā§āĻŦāĻāĻžāϰ⧠āĻāĻāĻāĻŋ āĻ āĻŦāĻā§āĻā§āĻāĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $props: object }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
āĻļā§āϧā§āĻŽāĻžāϤā§āϰ
props
āĻŦāĻŋāĻāϞā§āĻĒā§āϰ āĻŽāĻžāϧā§āϝāĻŽā§ āĻā§āώāĻŋāϤ āĻĒā§āϰāĻĒāϏ āĻ āύā§āϤāϰā§āĻā§āĻā§āϤ āĻāϰāĻž āĻšāĻŦā§āĨ¤ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ āĻĒā§āϰāĻā§āϏāĻŋ āĻāϰ āĻĒā§āϰāĻĒāϏ āĻ āĻŦāĻā§āĻā§āĻā§āϰ āĻŦā§āĻļāĻŋāώā§āĻā§āϝāĻā§āϞāĻŋāϤ⧠āĻ ā§āϝāĻžāĻā§āϏā§āϏ āĻāϰā§āĨ¤
$el â
āϰā§āĻ DOM āύā§āĻĄ āϝāĻž āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ āĻĒāϰāĻŋāĻāĻžāϞāύāĻž āĻāϰāĻā§āĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $el: any }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻāĻŋ āĻŽāĻžāĻāύā§āĻ āĻāϰāĻž āύāĻž āĻšāĻāϝāĻŧāĻž āĻĒāϰā§āϝāύā§āϤ
$el
āĻ āϏāĻāĻā§āĻāĻžāϝāĻŧāĻŋāϤ
āĻĨāĻžāĻāĻŦā§āĨ¤- āĻāĻāĻāĻŋ āĻāĻāĻ āĻŽā§āϞ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āϏāĻš āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻā§āϞāĻŋāϰ āĻāύā§āϝ,
$el
āϏā§āĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻāĻŋāĻā§ āύāĻŋāϰā§āĻĻā§āĻļ āĻāϰāĻŦā§ā§ˇ - āĻĒāĻžāĻ ā§āϝ āϰā§āĻ āϏāĻš āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻā§āϞāĻŋāϰ āĻāύā§āϝ,
$el
āĻĒāĻžāĻ ā§āϝ āύā§āĻĄā§āϰ āĻĻāĻŋāĻā§ āύāĻŋāϰā§āĻĻā§āĻļ āĻāϰāĻŦā§āĨ¤ - āĻāĻāĻžāϧāĻŋāĻ āϰā§āĻ āύā§āĻĄ āϏāĻš āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻā§āϞāĻŋāϰ āĻāύā§āϝ,
$el
āĻšāĻŦā§ āϏā§āĻĨāĻžāύāϧāĻžāϰāĻ DOM āύā§āĻĄ āϝāĻž Vue āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰ⧠DOM-āĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻāϏ āĻ āĻŦāϏā§āĻĨāĻžāύā§āϰ āĻā§āϰā§āϝāĻžāĻ āϰāĻžāĻāϤ⧠(āĻāĻāĻāĻŋ āĻĒāĻžāĻ ā§āϝ āύā§āĻĄ, āĻŦāĻž SSR āĻšāĻžāĻāĻĄā§āϰā§āĻļāύ āĻŽā§āĻĄā§ āĻāĻāĻāĻŋ āĻŽāύā§āϤāĻŦā§āϝ āύā§āĻĄ)āĨ¤
TIP
āϏāĻžāĻŽāĻā§āĻāϏā§āϝā§āϰ āĻāύā§āϝ,
$el
āĻāϰ āĻāĻĒāϰ āύāĻŋāϰā§āĻāϰ āύāĻž āĻāϰ⧠āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻā§āϞāĻŋāϤ⧠āϏāϰāĻžāϏāϰāĻŋ āĻ ā§āϝāĻžāĻā§āϏā§āϏā§āϰ āĻāύā§āϝ āĻā§āĻŽāĻĒā§āϞā§āĻ āϰā§āĻĢāϏ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰāĻžāϰ āĻĒāϰāĻžāĻŽāϰā§āĻļ āĻĻā§āĻāϝāĻŧāĻž āĻšāϝāĻŧāĨ¤- āĻāĻāĻāĻŋ āĻāĻāĻ āĻŽā§āϞ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āϏāĻš āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻā§āϞāĻŋāϰ āĻāύā§āϝ,
$options â
āĻŦāϰā§āϤāĻŽāĻžāύ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ āĻāύāϏā§āĻā§āϝāĻžāύā§āĻ āĻāϰāĻžāϰ āĻāύā§āϝ āĻŦā§āϝāĻŦāĻšā§āϤ āϏāĻŽāĻžāϧāĻžāύāĻā§āϤ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻ āĻĒāĻļāύāĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $options: ComponentOptions }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
$options
āĻ āĻŦāĻā§āĻā§āĻ āĻŦāϰā§āϤāĻŽāĻžāύ āĻāĻŽā§āĻĒā§āύā§āύā§āĻāϏ āĻāύā§āϝ āϏāĻŽāĻžāϧāĻžāύ āĻāϰāĻž āĻŦāĻŋāĻāϞā§āĻĒāĻā§āϞāĻŋāĻā§ āĻĒā§āϰāĻāĻžāĻļ āĻāϰ⧠āĻāĻŦāĻ āĻāĻ āϏāĻŽā§āĻāĻžāĻŦā§āϝ āĻāϤā§āϏāĻā§āϞāĻŋāϰ āĻāĻāϤā§āϰāĻŋāϤ āĻĢāϞāĻžāĻĢāϞ:- Global mixins
- Component
extends
base - Component mixins
āĻāĻāĻŋ āϏāĻžāϧāĻžāϰāĻŖāϤ āĻāĻžāϏā§āĻāĻŽ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻŦāĻŋāĻāϞā§āĻĒ āϏāĻŽāϰā§āĻĨāύ āĻāϰāϤ⧠āĻŦā§āϝāĻŦāĻšā§āϤ āĻšāϝāĻŧ:
jsconst app = createApp({ customOption: 'foo', created() { console.log(this.$options.customOption) // => 'foo' } })
āĻāϰ⧠āĻĻā§āĻā§āύ
app.config.optionMergeStrategies
$parent â
āĻĒā§āϝāĻžāϰā§āύā§āĻ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ, āϝāĻĻāĻŋ āĻŦāϰā§āϤāĻŽāĻžāύ āĻāύāϏā§āĻā§āϝāĻžāύā§āϏ⧠āĻāĻāĻāĻŋ āĻĨāĻžāĻā§āĨ¤ āĻāĻāĻŋ āϰā§āĻ āĻāĻĻāĻžāĻšāϰāĻŖā§āϰ āĻāύā§āϝāĻ null
āĻšāĻŦā§āĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $parent: ComponentPublicInstance | null }
$root â
The root component instance of the current component tree. If the current instance has no parents this value will be itself.
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $root: ComponentPublicInstance }
$slots â
An object representing the slots passed by the parent component.
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $slots: { [name: string]: Slot } } type Slot = (...args: any[]) => VNode[]
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
āϏāĻžāϧāĻžāϰāĻŖāϤ āĻŽā§āϝāĻžāύā§āϝāĻŧāĻžāϞāĻŋ āϰā§āύā§āĻĄāĻžāϰ āĻĢāĻžāĻāĻļāύ āϞā§āĻāĻžāϰ āϏāĻŽāϝāĻŧ āĻŦā§āϝāĻŦāĻšā§āϤ āĻšāϝāĻŧ, āϤāĻŦā§ āϏā§āϞāĻ āĻāĻĒāϏā§āĻĨāĻŋāϤ āĻāĻā§ āĻāĻŋāύāĻž āϤāĻž āϏāύāĻžāĻā§āϤ āĻāϰāϤā§āĻ āĻŦā§āϝāĻŦāĻšāĻžāϰ āĻāϰāĻž āϝā§āϤ⧠āĻĒāĻžāϰā§āĨ¤
āĻĒā§āϰāϤāĻŋāĻāĻŋ āϏā§āϞāĻ
this.$slots
-āĻ āĻāĻāĻāĻŋ āĻĢāĻžāĻāĻļāύ āĻšāĻŋāϏā§āĻŦā§ āĻāύā§āĻŽā§āĻāĻŋāϤ āĻšāϝāĻŧ āϝāĻž āϏā§āĻ āϏā§āϞāĻā§āϰ āύāĻžāĻŽā§āϰ āϏāĻžāĻĨā§ āϏāĻŽā§āĻĒāϰā§āĻāĻŋāϤ āĻā§-āĻāϰ āĻ āϧā§āύ⧠āĻāύā§āĻĄā§āϰ āĻāĻāĻāĻŋ āĻ ā§āϝāĻžāϰ⧠āĻĒā§āϰāĻĻāĻžāύ āĻāϰā§āĨ¤ āĻĄāĻŋāĻĢāϞā§āĻ āϏā§āϞāĻāĻāĻŋthis.$slots.default
āĻšāĻŋāϏā§āĻŦā§ āĻĒā§āϰāĻāĻžāĻļ āĻāϰāĻž āĻšāϝāĻŧā§āĻā§āĨ¤āϝāĻĻāĻŋ āĻāĻāĻāĻŋ āϏā§āϞāĻ āĻāĻāĻāĻŋ āϏā§āĻā§āĻĒāĻĄ āϏā§āϞāĻ āĻšāϝāĻŧ, āϤāĻžāĻšāϞ⧠āϏā§āϞāĻ āĻĢāĻžāĻāĻļāύ⧠āĻĒāĻžāϏ āĻāϰāĻž āĻāϰā§āĻā§āĻŽā§āύā§āĻāĻā§āϞāĻŋ āϏā§āϞāĻ āĻĒā§āϰāĻĒāϏ āĻšāĻŋāϏāĻžāĻŦā§ āϏā§āϞāĻā§ āĻāĻĒāϞāĻŦā§āϧ āĻĨāĻžāĻā§āĨ¤
āĻāϰ⧠āĻĻā§āĻā§āύ Render Functions - Rendering Slots
$refs â
DOM āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāĻŦāĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻāĻĻāĻžāĻšāϰāĻŖā§āϰ āĻāĻāĻāĻŋ āĻ āĻŦāĻā§āĻā§āĻ, āĻāϰ āĻŽāĻžāϧā§āϝāĻŽā§ āύāĻŋāĻŦāύā§āϧāĻŋāϤ⧎ template refs.
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $refs: { [name: string]: Element | ComponentPublicInstance | null } }
āĻāϰ⧠āĻĻā§āĻā§āύ
$attrs â
āĻāĻāĻāĻŋ āĻ āĻŦāĻā§āĻā§āĻ āϝāĻž āĻāĻŽā§āĻĒā§āύā§āύā§āĻāϏ āĻĢāϞ-āĻĨā§āϰ⧠āĻŦā§āĻļāĻŋāώā§āĻā§āϝ āϧāĻžāϰāĻŖ āĻāϰā§āĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $attrs: object }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
Fallthrough Attributes āĻšāϞ āĻ ā§āϝāĻžāĻā§āϰāĻŋāĻŦāĻŋāĻāĻ āĻāĻŦāĻ āĻāĻā§āύā§āĻ āĻšā§āϝāĻžāύā§āĻĄāϞāĻžāϰ āϝāĻž āĻĒā§āϝāĻžāϰā§āύā§āĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻĻā§āĻŦāĻžāϰāĻž āĻĒāĻžāϏ āĻāϰāĻž āĻšāϝāĻŧ, āĻāĻŋāύā§āϤ⧠āϏāύā§āϤāĻžāύā§āϰ āĻĻā§āĻŦāĻžāϰāĻž āĻĒā§āϰāĻĒ āĻŦāĻž āύāĻŋāϰā§āĻāϤ āĻāĻā§āύā§āĻ āĻšāĻŋāϏāĻžāĻŦā§ āĻā§āώāĻŖāĻž āĻāϰāĻž āĻšāϝāĻŧ āύāĻžāĨ¤
āĻĄāĻŋāĻĢāϞā§āĻāϰā§āĻĒā§, āĻļā§āϧā§āĻŽāĻžāϤā§āϰ āĻāĻāĻāĻŋ āϰā§āĻ āĻāĻŽā§āĻĒā§āύā§āύā§āĻ āĻĨāĻžāĻāϞā§
$attrs
-āĻāϰ āϏāĻŦāĻāĻŋāĻā§ āϏā§āĻŦāϝāĻŧāĻāĻā§āϰāĻŋāϝāĻŧāĻāĻžāĻŦā§ āĻāĻŽā§āĻĒā§āύā§āύā§āĻā§āϰ āϰā§āĻ āĻāϞāĻŋāĻŽā§āύā§āĻā§ āĻāϤā§āϤāϰāĻžāϧāĻŋāĻāĻžāϰ āϏā§āϤā§āϰ⧠āĻĒā§āϰāĻžāĻĒā§āϤ āĻšāĻŦā§āĨ¤ āĻāĻ āĻāĻāϰāĻŖāĻāĻŋ āĻ āĻā§āώāĻŽ āĻāϰāĻž āĻšāϝāĻŧ āϝāĻĻāĻŋ āĻāĻŽā§āĻĒā§āύā§āύā§āĻāĻāĻŋāϰ āĻāĻāĻžāϧāĻŋāĻ āϰā§āĻ āύā§āĻĄ āĻĨāĻžāĻā§ āĻāĻŦāĻinheritAttrs
āĻŦāĻŋāĻāϞā§āĻĒā§āϰ āϏāĻžāĻĨā§ āϏā§āĻĒāώā§āĻāĻāĻžāĻŦā§ āύāĻŋāώā§āĻā§āϰāĻŋāϝāĻŧ āĻāϰāĻž āϝā§āϤ⧠āĻĒāĻžāϰā§āĨ¤āĻāϰ⧠āĻĻā§āĻā§āύ
$watch() â
āĻĒāϰā§āϝāĻŦā§āĻā§āώāĻ āϤā§āϰāĻŋāϰ āĻāύā§āϝ āĻ āĻĒāϰāĻŋāĻšāĻžāϰā§āϝ APIāĨ¤
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $watch( source: string | (() => any), callback: WatchCallback, options?: WatchOptions ): StopHandle } type WatchCallback<T> = ( value: T, oldValue: T, onCleanup: (cleanupFn: () => void) => void ) => void interface WatchOptions { immediate?: boolean // default: false deep?: boolean // default: false flush?: 'pre' | 'post' | 'sync' // default: 'pre' onTrack?: (event: DebuggerEvent) => void onTrigger?: (event: DebuggerEvent) => void } type StopHandle = () => void
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
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immediate
: trigger the callback immediately on watcher creation. Old value will beundefined
on the first call.deep
: force deep traversal of the source if it is an object, so that the callback fires on deep mutations. See Deep Watchers.flush
: adjust the callback's flush timing. See Callback Flush Timing andwatchEffect()
.onTrack / onTrigger
: debug the watcher's dependencies. See Watcher Debugging.
Example
Watch a property name:
jsthis.$watch('a', (newVal, oldVal) => {})
Watch a dot-delimited path:
jsthis.$watch('a.b', (newVal, oldVal) => {})
Using getter for more complex expressions:
jsthis.$watch( // every time the expression `this.a + this.b` yields // a different result, the handler will be called. // It's as if we were watching a computed property // without defining the computed property itself. () => this.a + this.b, (newVal, oldVal) => {} )
Stopping the watcher:
jsconst unwatch = this.$watch('a', cb) // later... unwatch()
āĻāϰ⧠āĻĻā§āĻā§āύ
$emit() â
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āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $emit(event: string, ...args: any[]): void }
Example
jsexport default { created() { // only event this.$emit('foo') // with additional arguments this.$emit('bar', 1, 2, 3) } }
āĻāϰ⧠āĻĻā§āĻā§āύ
$forceUpdate() â
Force the component instance to re-render.
āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $forceUpdate(): void }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
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$nextTick() â
āĻā§āϞā§āĻŦāĻžāϞ nextTick()
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āĻāĻžāĻāĻĒ
tsinterface ComponentPublicInstance { $nextTick(callback?: (this: ComponentPublicInstance) => void): Promise<void> }
** āĻŦāĻŋāϏā§āϤāĻžāϰāĻŋāϤ**
nextTick()
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nextTick()
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