Call a Vuejs component method from outside the component

Interacting with Vue.js parts is important for gathering dynamic and responsive internet purposes. Frequently, you’ll demand to set off actions inside a constituent from an outer origin, specified arsenic a genitor constituent, a abstracted module, oregon equal a 3rd-organization room. Mastering the creation of calling a Vue.js constituent technique externally unlocks a fresh flat of power and flexibility successful your improvement workflow. This permits for seamless connection betwixt antithetic components of your exertion and empowers you to make much analyzable and interactive person experiences. This article delves into assorted methods for reaching this, offering applicable examples and champion practices to guarantee cleanable and businesslike codification.

Knowing Constituent Connection

Successful Vue.js, parts are designed to beryllium modular and reusable. Effectual connection betwixt these parts is indispensable for gathering analyzable purposes. Piece props and occasions are generally utilized for genitor-kid connection, typically you demand to call a constituent’s methodology straight from extracurricular its contiguous hierarchy. This is wherever methods similar refs, case buses, and supply/inject travel into drama. Knowing these strategies is cardinal to gathering strong and maintainable Vue.js purposes.

For illustration, ideate a script wherever you person a modal constituent and you privation to unfastened it from a wholly antithetic portion of your exertion. Straight calling the modal’s unfastened methodology from an outer origin supplies a concise and easy resolution.

Utilizing Refs to Call Constituent Strategies

Refs supply a nonstop manner to entree a constituent case and its strategies. By assigning a ref to a constituent successful your template, you tin past entree this ref successful your JavaScript codification and call immoderate of the constituent’s strategies. This is peculiarly utile once you demand exact power complete a circumstantial constituent’s behaviour from extracurricular its average range.

Present’s however it plant: Successful your template, adhd a ref property to the constituent: <my-constituent ref="myComponent"></my-constituent>. Past, successful your JavaScript codification, you tin entree the constituent case through this.$refs.myComponent. You tin past call immoderate methodology outlined inside your constituent: this.$refs.myComponent.myMethod(); This nonstop attack is almighty however ought to beryllium utilized judiciously to debar choky coupling betwixt parts.

Champion Practices for Utilizing Refs

Usage refs sparingly and lone once perfectly essential.
Debar utilizing refs for elemental genitor-kid connection; like props and occasions.
Beryllium conscious of the constituent lifecycle; guarantee the ref is disposable earlier making an attempt to entree it.

Leveraging Case Buses for Decoupled Connection

Case buses supply a much decoupled attack to calling constituent strategies. By creating a cardinal case autobus, elements tin emit occasions that another parts tin perceive for, triggering circumstantial actions. This technique promotes free coupling and makes your codification much maintainable, particularly successful bigger functions. It’s akin to the print-subscribe form, wherever 1 constituent publishes an case and different subscribes to it.

Make a fresh Vue case to service arsenic your case autobus: const eventBus = fresh Vue();. Successful the constituent emitting the case: eventBus.$emit('my-case', information);. Successful the constituent receiving the case: eventBus.$connected('my-case', (information) => { this.myMethod(information); }); This attack is peculiarly adjuvant for connection betwixt elements that aren’t straight associated successful the constituent hierarchy.

Supply/Inject for Precocious Dependency Injection

The supply/inject form is a almighty manner to stock information and strategies crossed a constituent hierarchy with out prop drilling. A genitor constituent tin “supply” information oregon strategies, and immoderate descendant constituent tin “inject” them. This is peculiarly utile for offering entree to utilities oregon providers from a cardinal component successful your exertion. This attack is much precocious however gives a cleaner resolution for analyzable situations.

Successful the genitor constituent: supply: { myMethod: this.myMethod }. Successful the kid constituent: inject: ['myMethod']. This permits the kid constituent to straight call the supplied methodology. Piece almighty, usage this form judiciously, arsenic overuse tin brand constituent relationships little broad.

Selecting the Correct Attack

Choosing the due methodology relies upon connected your circumstantial wants. For elemental genitor-kid interactions, implement to props and occasions. For nonstop entree to a constituent’s strategies, refs tin beryllium utile. For decoupled connection, case buses are perfect. And for analyzable dependency injection situations, see supply/inject. Knowing the strengths and weaknesses of all attack is important for gathering fine-structured and maintainable Vue.js purposes. Larn much astir constituent connection present.

Analyse your constituent relation.
See the complexity of the action.
Take the methodology that champion fits your wants.

Infographic Placeholder: Ocular examination of constituent connection strategies.

Often Requested Questions

Q: What is the champion manner to call a methodology successful a kid constituent from a genitor constituent?

A: For basal genitor-kid connection, emitting an case from the genitor and listening for it successful the kid is mostly the champion attack. This retains elements loosely coupled and simpler to negociate.

Mastering these methods volition importantly heighten your Vue.js improvement abilities, permitting you to physique much analyzable and interactive functions. Retrieve to take the technique that champion fits your circumstantial wants, prioritizing maintainability and codification readability. Research these antithetic methods successful your initiatives to deepen your knowing and physique much strong purposes. Dive deeper into Vue.js documentation and assemblage sources to unlock equal much precocious strategies for constituent action and connection.

Prioritize utilizing props and customized occasions for modular genitor-kid connection.
Leverage refs for nonstop entree to constituent cases and strategies, however usage them sparingly.

Question & Answer :
Fto’s opportunity I person a chief Vue case that has kid elements. Is location a manner of calling a methodology belonging to 1 of these parts from extracurricular the Vue case wholly?

Present is an illustration:

``` var vm = fresh Vue({ el: '#app', parts: { 'my-constituent': { template: '#my-template', information: relation() { instrument { number: 1, }; }, strategies: { increaseCount: relation() { this.number++; } } }, } }); $('#outer-fastener').click on(relation() { vm['my-constituent'].increaseCount(); // This doesn't activity }); ```

<book src="http://vuejs.org/js/vue.js"></book> <book src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></book> <div id="app"> <my-constituent></my-constituent> <br> <fastener id="outer-fastener">Outer Fastener</fastener> </div> <template id="my-template"> <div kind="borderline: 1px coagulated; padding: 5px;"> <p>A antagonistic: {{ number }}</p> <fastener @click on="increaseCount">Inner Fastener</fastener> </div> </template>

Truthful once I click on the inner fastener, the `increaseCount()` technique is certain to its click on case truthful it will get referred to as. Location is nary manner to hindrance the case to the outer fastener, whose click on case I americium listening for with jQuery, truthful I'll demand any another manner to call `increaseCount`.

EDIT

It appears this plant:

vm.$kids[zero].increaseCount();

Nevertheless, this is not a bully resolution due to the fact that I americium referencing the constituent by its scale successful the kids array, and with galore elements this is improbable to act changeless and the codification is little readable.

Successful the extremity I opted for utilizing Vue’s ref directive. This permits a constituent to beryllium referenced from the genitor for nonstop entree.

E.g.

Person a constituent registered connected my genitor case:

const vm = fresh Vue({ el: '#app', parts: { 'my-constituent': myComponent } });

Render the constituent successful template/html with a mention:

<my-constituent ref="foo"></my-constituent>

Present, elsewhere I tin entree the constituent externally

<book> vm.$refs.foo.doSomething(); //assuming my constituent has a doSomething() technique </book>

Seat this fiddle for an illustration: https://jsfiddle.nett/0zefx8o6/

(aged illustration utilizing Vue 1: https://jsfiddle.nett/6v7y6msr/)

Edit for Vue3 - Creation API

The kid-constituent has to instrument the relation successful setup you privation to usage successful the genitor-constituent other the relation is not disposable to the genitor.

Line: <book setup> doc is not affacted, due to the fact that it supplies each the capabilities and variables to the template by default.