puppeteer/assets/js/d9ec275b.7522f2a7.js
release-please[bot] c7ae9c5b6a deploy: 50bcff2ec2
2022-08-09 11:30:38 +00:00

1 line
6.1 KiB
JavaScript

"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[45357],{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 o(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):p(p({},t),e)),n},s=function(e){var t=m(e.components);return r.createElement(i.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,i=e.parentName,s=o(e,["components","mdxType","originalType","parentName"]),d=m(n),c=a,v=d["".concat(i,".").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 o={};for(var i in t)hasOwnProperty.call(t,i)&&(o[i]=t[i]);o.originalType=e,o.mdxType="string"==typeof e?e:a,p[1]=o;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"},34746:(e,t,n)=>{n.r(t),n.d(t,{assets:()=>i,contentTitle:()=>p,default:()=>u,frontMatter:()=>l,metadata:()=>o,toc:()=>m});var r=n(87462),a=(n(67294),n(3905));const l={sidebar_label:"ElementHandle.$$eval"},p="ElementHandle.$$eval() method",o={unversionedId:"api/puppeteer.elementhandle.__eval",id:"version-16.1.0/api/puppeteer.elementhandle.__eval",title:"ElementHandle.$$eval() method",description:"This method runs document.querySelectorAll within the element and passes it as the first argument to pageFunction. If there's no element matching selector, the method throws an error.",source:"@site/versioned_docs/version-16.1.0/api/puppeteer.elementhandle.__eval.md",sourceDirName:"api",slug:"/api/puppeteer.elementhandle.__eval",permalink:"/api/puppeteer.elementhandle.__eval",draft:!1,tags:[],version:"16.1.0",frontMatter:{sidebar_label:"ElementHandle.$$eval"},sidebar:"sidebar",previous:{title:"ElementHandle.$$",permalink:"/api/puppeteer.elementhandle.__"},next:{title:"ElementHandle.$eval",permalink:"/api/puppeteer.elementhandle._eval"}},i={},m=[{value:"Parameters",id:"parameters",level:2},{value:"Example 1",id:"example-1",level:2},{value:"Example 2",id:"example-2",level:2}],s={toc:m};function u(e){let{components:t,...n}=e;return(0,a.kt)("wrapper",(0,r.Z)({},s,n,{components:t,mdxType:"MDXLayout"}),(0,a.kt)("h1",{id:"elementhandleeval-method"},"ElementHandle.$$eval() method"),(0,a.kt)("p",null,"This method runs ",(0,a.kt)("inlineCode",{parentName:"p"},"document.querySelectorAll")," 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 [Array<NodeFor<Selector>>, ...Params]\n > = EvaluateFunc<[Array<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-1"},"Example 1"),(0,a.kt)("pre",null,(0,a.kt)("code",{parentName:"pre",className:"language-html"},'<div class="feed">\n <div class="tweet">Hello!</div>\n <div class="tweet">Hi!</div>\n</div>\n')),(0,a.kt)("h2",{id:"example-2"},"Example 2"),(0,a.kt)("pre",null,(0,a.kt)("code",{parentName:"pre",className:"language-ts"},"const feedHandle = await page.$('.feed');\nexpect(\n await feedHandle.$$eval('.tweet', nodes => nodes.map(n => n.innerText))\n).toEqual(['Hello!', 'Hi!']);\n")))}u.isMDXComponent=!0}}]);