"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[63706],{3905:(e,t,n)=>{n.d(t,{Zo:()=>s,kt:()=>c});var r=n(67294);function a(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}function l(e,t){var n=Object.keys(e);if(Object.getOwnPropertySymbols){var r=Object.getOwnPropertySymbols(e);t&&(r=r.filter((function(t){return Object.getOwnPropertyDescriptor(e,t).enumerable}))),n.push.apply(n,r)}return n}function p(e){for(var t=1;t<arguments.length;t++){var n=null!=arguments[t]?arguments[t]:{};t%2?l(Object(n),!0).forEach((function(t){a(e,t,n[t])})):Object.getOwnPropertyDescriptors?Object.defineProperties(e,Object.getOwnPropertyDescriptors(n)):l(Object(n)).forEach((function(t){Object.defineProperty(e,t,Object.getOwnPropertyDescriptor(n,t))}))}return e}function i(e,t){if(null==e)return{};var n,r,a=function(e,t){if(null==e)return{};var n,r,a={},l=Object.keys(e);for(r=0;r<l.length;r++)n=l[r],t.indexOf(n)>=0||(a[n]=e[n]);return a}(e,t);if(Object.getOwnPropertySymbols){var l=Object.getOwnPropertySymbols(e);for(r=0;r<l.length;r++)n=l[r],t.indexOf(n)>=0||Object.prototype.propertyIsEnumerable.call(e,n)&&(a[n]=e[n])}return a}var o=r.createContext({}),m=function(e){var t=r.useContext(o),n=t;return e&&(n="function"==typeof e?e(t):p(p({},t),e)),n},s=function(e){var t=m(e.components);return r.createElement(o.Provider,{value:t},e.children)},u={inlineCode:"code",wrapper:function(e){var t=e.children;return r.createElement(r.Fragment,{},t)}},d=r.forwardRef((function(e,t){var n=e.components,a=e.mdxType,l=e.originalType,o=e.parentName,s=i(e,["components","mdxType","originalType","parentName"]),d=m(n),c=a,v=d["".concat(o,".").concat(c)]||d[c]||u[c]||l;return n?r.createElement(v,p(p({ref:t},s),{},{components:n})):r.createElement(v,p({ref:t},s))}));function c(e,t){var n=arguments,a=t&&t.mdxType;if("string"==typeof e||a){var l=n.length,p=new Array(l);p[0]=d;var i={};for(var o in t)hasOwnProperty.call(t,o)&&(i[o]=t[o]);i.originalType=e,i.mdxType="string"==typeof e?e:a,p[1]=i;for(var m=2;m<l;m++)p[m]=n[m];return r.createElement.apply(null,p)}return r.createElement.apply(null,n)}d.displayName="MDXCreateElement"},11633:(e,t,n)=>{n.r(t),n.d(t,{assets:()=>o,contentTitle:()=>p,default:()=>u,frontMatter:()=>l,metadata:()=>i,toc:()=>m});var r=n(87462),a=(n(67294),n(3905));const l={sidebar_label:"EventEmitter"},p="EventEmitter class",i={unversionedId:"api/puppeteer.eventemitter",id:"api/puppeteer.eventemitter",title:"EventEmitter class",description:"The EventEmitter class that many Puppeteer classes extend.",source:"@site/../docs/api/puppeteer.eventemitter.md",sourceDirName:"api",slug:"/api/puppeteer.eventemitter",permalink:"/next/api/puppeteer.eventemitter",draft:!1,tags:[],version:"current",frontMatter:{sidebar_label:"EventEmitter"},sidebar:"sidebar",previous:{title:"EvaluateFunc",permalink:"/next/api/puppeteer.evaluatefunc"},next:{title:"EventEmitter.addListener",permalink:"/next/api/puppeteer.eventemitter.addlistener"}},o={},m=[{value:"Remarks",id:"remarks",level:2},{value:"Methods",id:"methods",level:2}],s={toc:m};function u(e){let{components:t,...n}=e;return(0,a.kt)("wrapper",(0,r.Z)({},s,n,{components:t,mdxType:"MDXLayout"}),(0,a.kt)("h1",{id:"eventemitter-class"},"EventEmitter class"),(0,a.kt)("p",null,"The EventEmitter class that many Puppeteer classes extend."),(0,a.kt)("p",null,(0,a.kt)("strong",{parentName:"p"},"Signature:")),(0,a.kt)("pre",null,(0,a.kt)("code",{parentName:"pre",className:"language-typescript"},"export declare class EventEmitter implements CommonEventEmitter \n")),(0,a.kt)("p",null,(0,a.kt)("strong",{parentName:"p"},"Implements:")," ",(0,a.kt)("a",{parentName:"p",href:"/next/api/puppeteer.commoneventemitter"},"CommonEventEmitter")),(0,a.kt)("h2",{id:"remarks"},"Remarks"),(0,a.kt)("p",null,"This allows you to listen to events that Puppeteer classes fire and act accordingly. Therefore you'll mostly use ",(0,a.kt)("a",{parentName:"p",href:"/next/api/puppeteer.eventemitter.on"},"on")," and ",(0,a.kt)("a",{parentName:"p",href:"/next/api/puppeteer.eventemitter.off"},"off")," to bind and unbind to event listeners."),(0,a.kt)("p",null,"The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the ",(0,a.kt)("inlineCode",{parentName:"p"},"EventEmitter")," class."),(0,a.kt)("h2",{id:"methods"},"Methods"),(0,a.kt)("table",null,(0,a.kt)("thead",{parentName:"table"},(0,a.kt)("tr",{parentName:"thead"},(0,a.kt)("th",{parentName:"tr",align:null},"Method"),(0,a.kt)("th",{parentName:"tr",align:null},"Modifiers"),(0,a.kt)("th",{parentName:"tr",align:null},"Description"))),(0,a.kt)("tbody",{parentName:"table"},(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.addlistener"},"addListener(event, handler)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Add an event listener.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.emit"},"emit(event, eventData)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Emit an event and call any associated listeners.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.listenercount"},"listenerCount(event)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Gets the number of listeners for a given event.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.off"},"off(event, handler)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Remove an event listener from firing.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.on"},"on(event, handler)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Bind an event listener to fire when an event occurs.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.once"},"once(event, handler)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Like ",(0,a.kt)("code",null,"on")," but the listener will only be fired once and then it will be removed.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.removealllisteners"},"removeAllListeners(event)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Removes all listeners. If given an event argument, it will remove only listeners for that event.")),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},(0,a.kt)("a",{parentName:"td",href:"/next/api/puppeteer.eventemitter.removelistener"},"removeListener(event, handler)")),(0,a.kt)("td",{parentName:"tr",align:null}),(0,a.kt)("td",{parentName:"tr",align:null},"Remove an event listener.")))))}u.isMDXComponent=!0}}]);