puppeteer/assets/js/d91d4d98.2a28af6a.js
release-please[bot] be6f724ac3 deploy: ec8c750383
2022-07-06 07:50:41 +00:00

1 line
5.9 KiB
JavaScript

"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[70052],{3905:(e,t,n)=>{n.d(t,{Zo:()=>u,kt:()=>d});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 o(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 p(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 i=r.createContext({}),m=function(e){var t=r.useContext(i),n=t;return e&&(n="function"==typeof e?e(t):o(o({},t),e)),n},u=function(e){var t=m(e.components);return r.createElement(i.Provider,{value:t},e.children)},s={inlineCode:"code",wrapper:function(e){var t=e.children;return r.createElement(r.Fragment,{},t)}},c=r.forwardRef((function(e,t){var n=e.components,a=e.mdxType,l=e.originalType,i=e.parentName,u=p(e,["components","mdxType","originalType","parentName"]),c=m(n),d=a,g=c["".concat(i,".").concat(d)]||c[d]||s[d]||l;return n?r.createElement(g,o(o({ref:t},u),{},{components:n})):r.createElement(g,o({ref:t},u))}));function d(e,t){var n=arguments,a=t&&t.mdxType;if("string"==typeof e||a){var l=n.length,o=new Array(l);o[0]=c;var p={};for(var i in t)hasOwnProperty.call(t,i)&&(p[i]=t[i]);p.originalType=e,p.mdxType="string"==typeof e?e:a,o[1]=p;for(var m=2;m<l;m++)o[m]=n[m];return r.createElement.apply(null,o)}return r.createElement.apply(null,n)}c.displayName="MDXCreateElement"},22558:(e,t,n)=>{n.r(t),n.d(t,{assets:()=>i,contentTitle:()=>o,default:()=>s,frontMatter:()=>l,metadata:()=>p,toc:()=>m});var r=n(87462),a=(n(67294),n(3905));const l={sidebar_label:"ElementHandle.$eval"},o="ElementHandle.$eval() method",p={unversionedId:"api/puppeteer.elementhandle._eval",id:"version-15.3.1/api/puppeteer.elementhandle._eval",title:"ElementHandle.$eval() method",description:"This method runs document.querySelector within the element and passes it as the first argument to pageFunction. If there's no element matching selector, the method throws an error.",source:"@site/versioned_docs/version-15.3.1/api/puppeteer.elementhandle._eval.md",sourceDirName:"api",slug:"/api/puppeteer.elementhandle._eval",permalink:"/api/puppeteer.elementhandle._eval",draft:!1,tags:[],version:"15.3.1",frontMatter:{sidebar_label:"ElementHandle.$eval"},sidebar:"sidebar",previous:{title:"ElementHandle.$$eval",permalink:"/api/puppeteer.elementhandle.__eval"},next:{title:"ElementHandle.$x",permalink:"/api/puppeteer.elementhandle._x"}},i={},m=[{value:"Parameters",id:"parameters",level:2},{value:"Example",id:"example",level:2}],u={toc:m};function s(e){let{components:t,...n}=e;return(0,a.kt)("wrapper",(0,r.Z)({},u,n,{components:t,mdxType:"MDXLayout"}),(0,a.kt)("h1",{id:"elementhandleeval-method"},"ElementHandle.$eval() method"),(0,a.kt)("p",null,"This method runs ",(0,a.kt)("inlineCode",{parentName:"p"},"document.querySelector")," within the element and passes it as the first argument to ",(0,a.kt)("inlineCode",{parentName:"p"},"pageFunction"),". If there's no element matching ",(0,a.kt)("inlineCode",{parentName:"p"},"selector"),", the method throws an error."),(0,a.kt)("p",null,"If ",(0,a.kt)("inlineCode",{parentName:"p"},"pageFunction")," returns a Promise, then ",(0,a.kt)("inlineCode",{parentName:"p"},"frame.$eval")," would wait for the promise to resolve and return its value."),(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"},"class ElementHandle {\n $eval<\n Selector extends string,\n Params extends unknown[],\n Func extends EvaluateFunc<\n [ElementHandle<NodeFor<Selector>>, ...Params]\n > = EvaluateFunc<[ElementHandle<NodeFor<Selector>>, ...Params]>\n >(\n selector: Selector,\n pageFunction: Func | string,\n ...args: Params\n ): Promise<Awaited<ReturnType<Func>>>;\n}\n")),(0,a.kt)("h2",{id:"parameters"},"Parameters"),(0,a.kt)("table",null,(0,a.kt)("thead",{parentName:"table"},(0,a.kt)("tr",{parentName:"thead"},(0,a.kt)("th",{parentName:"tr",align:null},"Parameter"),(0,a.kt)("th",{parentName:"tr",align:null},"Type"),(0,a.kt)("th",{parentName:"tr",align:null},"Description"))),(0,a.kt)("tbody",{parentName:"table"},(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},"selector"),(0,a.kt)("td",{parentName:"tr",align:null},"Selector"),(0,a.kt)("td",{parentName:"tr",align:null})),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},"pageFunction"),(0,a.kt)("td",{parentName:"tr",align:null},"Func ","|"," string"),(0,a.kt)("td",{parentName:"tr",align:null})),(0,a.kt)("tr",{parentName:"tbody"},(0,a.kt)("td",{parentName:"tr",align:null},"args"),(0,a.kt)("td",{parentName:"tr",align:null},"Params"),(0,a.kt)("td",{parentName:"tr",align:null})))),(0,a.kt)("p",null,(0,a.kt)("strong",{parentName:"p"},"Returns:")),(0,a.kt)("p",null,"Promise","<","Awaited","<","ReturnType","<","Func",">",">",">"),(0,a.kt)("h2",{id:"example"},"Example"),(0,a.kt)("pre",null,(0,a.kt)("code",{parentName:"pre",className:"language-ts"},"const tweetHandle = await page.$('.tweet');\nexpect(await tweetHandle.$eval('.like', node => node.innerText)).toBe('100');\nexpect(await tweetHandle.$eval('.retweets', node => node.innerText)).toBe('10');\n")))}s.isMDXComponent=!0}}]);