puppeteer/assets/js/97f6a35b.8f5b83ef.js

/*! For license information please see 97f6a35b.8f5b83ef.js.LICENSE.txt */
"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[17155],{1167:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>o,contentTitle:()=>l,default:()=>p,frontMatter:()=>a,metadata:()=>i,toc:()=>c});var r=t(85893),s=t(11151);const a={sidebar_label:"Page.$$eval"},l="Page.$$eval() method",i={id:"api/puppeteer.page.__eval",title:"Page.$$eval() method",description:"This method runs Array.from(document.querySelectorAll(selector)) within the page and passes the result as the first argument to the pageFunction.",source:"@site/../docs/api/puppeteer.page.__eval.md",sourceDirName:"api",slug:"/api/puppeteer.page.__eval",permalink:"/next/api/puppeteer.page.__eval",draft:!1,unlisted:!1,tags:[],version:"current",frontMatter:{sidebar_label:"Page.$$eval"},sidebar:"api",previous:{title:"Page.$$",permalink:"/next/api/puppeteer.page.__"},next:{title:"Page.$eval",permalink:"/next/api/puppeteer.page._eval"}},o={},c=[{value:"Signature:",id:"signature",level:4},{value:"Parameters",id:"parameters",level:2},{value:"Remarks",id:"remarks",level:2},{value:"Example 1",id:"example-1",level:2},{value:"Example 2",id:"example-2",level:2},{value:"Example 3",id:"example-3",level:2}];function d(e){const n={a:"a",code:"code",h1:"h1",h2:"h2",h4:"h4",p:"p",pre:"pre",strong:"strong",...(0,s.a)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(n.h1,{id:"pageeval-method",children:"Page.$$eval() method"}),"\n",(0,r.jsxs)(n.p,{children:["This method runs ",(0,r.jsx)(n.code,{children:"Array.from(document.querySelectorAll(selector))"})," within the page and passes the result as the first argument to the ",(0,r.jsx)(n.code,{children:"pageFunction"}),"."]}),"\n",(0,r.jsx)(n.h4,{id:"signature",children:"Signature:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-typescript",children:"class Page {\n  $$eval<\n    Selector extends string,\n    Params extends unknown[],\n    Func extends EvaluateFuncWith<\n      Array<NodeFor<Selector>>,\n      Params\n    > = EvaluateFuncWith<Array<NodeFor<Selector>>, Params>,\n  >(\n    selector: Selector,\n    pageFunction: Func | string,\n    ...args: Params\n  ): Promise<Awaited<ReturnType<Func>>>;\n}\n"})}),"\n",(0,r.jsx)(n.h2,{id:"parameters",children:"Parameters"}),"\n",(0,r.jsxs)("table",{children:[(0,r.jsx)("thead",{children:(0,r.jsxs)("tr",{children:[(0,r.jsx)("th",{children:(0,r.jsx)(n.p,{children:"Parameter"})}),(0,r.jsx)("th",{children:(0,r.jsx)(n.p,{children:"Type"})}),(0,r.jsx)("th",{children:(0,r.jsx)(n.p,{children:"Description"})})]})}),(0,r.jsxs)("tbody",{children:[(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"selector"})}),(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"Selector"})}),(0,r.jsx)("td",{children:(0,r.jsxs)(n.p,{children:["the ",(0,r.jsx)(n.a,{href:"https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors",children:"selector"})," to query for"]})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"pageFunction"})}),(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"Func | string"})}),(0,r.jsx)("td",{children:(0,r.jsxs)(n.p,{children:["the function to be evaluated in the page context. Will be passed the result of ",(0,r.jsx)(n.code,{children:"Array.from(document.querySelectorAll(selector))"})," as its first argument."]})})]}),(0,r.jsxs)("tr",{children:[(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"args"})}),(0,r.jsx)("td",{children:(0,r.jsx)(n.p,{children:"Params"})}),(0,r.jsx)("td",{children:(0,r.jsxs)(n.p,{children:["any additional arguments to pass through to ",(0,r.jsx)(n.code,{children:"pageFunction"}),"."]})})]})]})]}),"\n",(0,r.jsx)(n.p,{children:(0,r.jsx)(n.strong,{children:"Returns:"})}),"\n",(0,r.jsx)(n.p,{children:"Promise<Awaited<ReturnType<Func>>>"}),"\n",(0,r.jsxs)(n.p,{children:["The result of calling ",(0,r.jsx)(n.code,{children:"pageFunction"}),". If it returns an element it is wrapped in an ",(0,r.jsx)(n.a,{href:"/next/api/puppeteer.elementhandle",children:"ElementHandle"}),", else the raw value itself is returned."]}),"\n",(0,r.jsx)(n.h2,{id:"remarks",children:"Remarks"}),"\n",(0,r.jsxs)(n.p,{children:["If ",(0,r.jsx)(n.code,{children:"pageFunction"})," returns a promise ",(0,r.jsx)(n.code,{children:"$$eval"})," will wait for the promise to resolve and then return its value."]}),"\n",(0,r.jsx)(n.h2,{id:"example-1",children:"Example 1"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"// get the amount of divs on the page\nconst divCount = await page.$$eval('div', divs => divs.length);\n\n// get the text content of all the `.options` elements:\nconst options = await page.$$eval('div > span.options', options => {\n  return options.map(option => option.textContent);\n});\n"})}),"\n",(0,r.jsxs)(n.p,{children:["If you are using TypeScript, you may have to provide an explicit type to the first argument of the ",(0,r.jsx)(n.code,{children:"pageFunction"}),". By default it is typed as ",(0,r.jsx)(n.code,{children:"Element[]"}),", but you may need to provide a more specific sub-type:"]}),"\n",(0,r.jsx)(n.h2,{id:"example-2",children:"Example 2"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"await page.$$eval('input', elements => {\n  return elements.map(e => e.value);\n});\n"})}),"\n",(0,r.jsxs)(n.p,{children:["The compiler should be able to infer the return type from the ",(0,r.jsx)(n.code,{children:"pageFunction"})," you provide. If it is unable to, you can use the generic type to tell the compiler what return type you expect from ",(0,r.jsx)(n.code,{children:"$$eval"}),":"]}),"\n",(0,r.jsx)(n.h2,{id:"example-3",children:"Example 3"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"const allInputValues = await page.$$eval('input', elements =>\n  elements.map(e => e.textContent)\n);\n"})})]})}function p(e={}){const{wrapper:n}={...(0,s.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(d,{...e})}):d(e)}},75251:(e,n,t)=>{var r=t(67294),s=Symbol.for("react.element"),a=Symbol.for("react.fragment"),l=Object.prototype.hasOwnProperty,i=r.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentOwner,o={key:!0,ref:!0,__self:!0,__source:!0};function c(e,n,t){var r,a={},c=null,d=null;for(r in void 0!==t&&(c=""+t),void 0!==n.key&&(c=""+n.key),void 0!==n.ref&&(d=n.ref),n)l.call(n,r)&&!o.hasOwnProperty(r)&&(a[r]=n[r]);if(e&&e.defaultProps)for(r in n=e.defaultProps)void 0===a[r]&&(a[r]=n[r]);return{$$typeof:s,type:e,key:c,ref:d,props:a,_owner:i.current}}n.Fragment=a,n.jsx=c,n.jsxs=c},85893:(e,n,t)=>{e.exports=t(75251)},11151:(e,n,t)=>{t.d(n,{Z:()=>i,a:()=>l});var r=t(67294);const s={},a=r.createContext(s);function l(e){const n=r.useContext(a);return r.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function i(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(s):e.components||s:l(e.components),r.createElement(a.Provider,{value:n},e.children)}}}]);