|
|
|
|
"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[96365],{30892:(e,t,n)=>{n.r(t),n.d(t,{assets:()=>o,contentTitle:()=>l,default:()=>p,frontMatter:()=>s,metadata:()=>i,toc:()=>c});var r=n(85893),a=n(11151);const s={sidebar_label:"Page.$eval"},l="Page.$eval() method",i={id:"api/puppeteer.page._eval",title:"Page.$eval() method",description:"This method runs document.querySelector within the page and passes the result as the first argument to the pageFunction.",source:"@site/versioned_docs/version-21.6.0/api/puppeteer.page._eval.md",sourceDirName:"api",slug:"/api/puppeteer.page._eval",permalink:"/api/puppeteer.page._eval",draft:!1,unlisted:!1,tags:[],version:"21.6.0",frontMatter:{sidebar_label:"Page.$eval"},sidebar:"api",previous:{title:"Page.$$eval",permalink:"/api/puppeteer.page.__eval"},next:{title:"Page.$x",permalink:"/api/puppeteer.page._x"}},o={},c=[{value:"Signature:",id:"signature",level:4},{value:"Parameters",id:"parameters",level:2},{value:"Remarks",id:"remarks",level:2},{value:"Example 1",id:"example-1",level:2},{value:"Example 2",id:"example-2",level:2},{value:"Example 3",id:"example-3",level:2}];function d(e){const t={a:"a",code:"code",h1:"h1",h2:"h2",h4:"h4",p:"p",pre:"pre",strong:"strong",table:"table",tbody:"tbody",td:"td",th:"th",thead:"thead",tr:"tr",...(0,a.a)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(t.h1,{id:"pageeval-method",children:"Page.$eval() method"}),"\n",(0,r.jsxs)(t.p,{children:["This method runs ",(0,r.jsx)(t.code,{children:"document.querySelector"})," within the page and passes the result as the first argument to the ",(0,r.jsx)(t.code,{children:"pageFunction"}),"."]}),"\n",(0,r.jsx)(t.h4,{id:"signature",children:"Signature:"}),"\n",(0,r.jsx)(t.pre,{children:(0,r.jsx)(t.code,{className:"language-typescript",children:"class Page {\n $eval<\n Selector extends string,\n Params extends unknown[],\n Func extends EvaluateFuncWith<NodeFor<Selector>, Params> = EvaluateFuncWith<\n NodeFor<Selector>,\n Params\n >,\n >(\n selector: Selector,\n pageFunction: Func | string,\n ...args: Params\n ): Promise<Awaited<ReturnType<Func>>>;\n}\n"})}),"\n",(0,r.jsx)(t.h2,{id:"parameters",children:"Parameters"}),"\n",(0,r.jsxs)(t.table,{children:[(0,r.jsx)(t.thead,{children:(0,r.jsxs)(t.tr,{children:[(0,r.jsx)(t.th,{children:"Parameter"}),(0,r.jsx)(t.th,{children:"Type"}),(0,r.jsx)(t.th,{children:"Description"})]})}),(0,r.jsxs)(t.tbody,{children:[(0,r.jsxs)(t.tr,{children:[(0,r.jsx)(t.td,{children:"selector"}),(0,r.jsx)(t.td,{children:"Selector"}),(0,r.jsxs)(t.td,{children:["the ",(0,r.jsx)(t.a,{href:"https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors",children:"selector"})," to query for"]})]}),(0,r.jsxs)(t.tr,{children:[(0,r.jsx)(t.td,{children:"pageFunction"}),(0,r.jsx)(t.td,{children:"Func | string"}),(0,r.jsxs)(t.td,{children:["the function to be evaluated in the page context. Will be passed the result of ",(0,r.jsx)("code",{children:"document.querySelector(selector)"})," as its first argument."]})]}),(0,r.jsxs)(t.tr,{children:[(0,r.jsx)(t.td,{children:"args"}),(0,r.jsx)(t.td,{children:"Params"}),(0,r.jsxs)(t.td,{children:["any additional arguments to pass through to ",(0,r.jsx)("code",{children:"pageFunction"}),"."]})]})]})]}),"\n",(0,r.jsx)(t.p,{children:(0,r.jsx)(t.strong,{children:"Returns:"})}),"\n",(0,r.jsx)(t.p,{children:"Promise<Awaited<ReturnType<Func>>>"}),"\n",(0,r.jsxs)(t.p,{children:["The result of calling ",(0,r.jsx)(t.code,{children:"pageFunction"}),". If it returns an element it is wrapped in an ",(0,r.jsx)(t.a,{href:"/api/puppeteer.elementhandle",children:"ElementHandle"}),", else the raw value itself is returned."]}),"\n",(0,r.jsx)(t.h2,{id:"remarks",children:"Remarks"}),"\n",(0,r.jsxs)(t.p,{children:["If no element is found matching ",(0,r.jsx)(t.code,{children:"selector"}),", the method will throw an error."]}),"\n",(0,r.jsxs)(t.p,{children:["If ",(0,r.jsx)(t.code,{children:"pageFunction"})," returns a promise ",(0,r.jsx)(t.code,{children:"$eval"})," will wait for the promise to resolve and the
|
