puppeteer/assets/js/95ee5c6b.6aed4c7c.js

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"use strict";(self.webpackChunkwebsite=self.webpackChunkwebsite||[]).push([[8978],{11385:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>c,contentTitle:()=>o,default:()=>d,frontMatter:()=>i,metadata:()=>s,toc:()=>p});var r=t(85893),a=t(11151);const i={sidebar_label:"Page.waitForFunction"},o="Page.waitForFunction() method",s={id:"api/puppeteer.page.waitforfunction",title:"Page.waitForFunction() method",description:"Waits for the provided function, pageFunction, to return a truthy value when evaluated in the page's context.",source:"@site/versioned_docs/version-22.0.0/api/puppeteer.page.waitforfunction.md",sourceDirName:"api",slug:"/api/puppeteer.page.waitforfunction",permalink:"/api/puppeteer.page.waitforfunction",draft:!1,unlisted:!1,tags:[],version:"22.0.0",frontMatter:{sidebar_label:"Page.waitForFunction"},sidebar:"api",previous:{title:"Page.waitForFrame",permalink:"/api/puppeteer.page.waitforframe"},next:{title:"Page.waitForNavigation",permalink:"/api/puppeteer.page.waitfornavigation"}},c={},p=[{value:"Signature:",id:"signature",level:4},{value:"Parameters",id:"parameters",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 l(e){const n={a:"a",code:"code",em:"em",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)(n.h1,{id:"pagewaitforfunction-method",children:"Page.waitForFunction() method"}),"\n",(0,r.jsxs)(n.p,{children:["Waits for the provided function, ",(0,r.jsx)(n.code,{children:"pageFunction"}),", to return a truthy value when evaluated in the page's context."]}),"\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  waitForFunction<\n    Params extends unknown[],\n    Func extends EvaluateFunc<Params> = EvaluateFunc<Params>,\n  >(\n    pageFunction: Func | string,\n    options?: FrameWaitForFunctionOptions,\n    ...args: Params\n  ): Promise<HandleFor<Awaited<ReturnType<Func>>>>;\n}\n"})}),"\n",(0,r.jsx)(n.h2,{id:"parameters",children:"Parameters"}),"\n",(0,r.jsxs)(n.table,{children:[(0,r.jsx)(n.thead,{children:(0,r.jsxs)(n.tr,{children:[(0,r.jsx)(n.th,{children:"Parameter"}),(0,r.jsx)(n.th,{children:"Type"}),(0,r.jsx)(n.th,{children:"Description"})]})}),(0,r.jsxs)(n.tbody,{children:[(0,r.jsxs)(n.tr,{children:[(0,r.jsx)(n.td,{children:"pageFunction"}),(0,r.jsx)(n.td,{children:"Func | string"}),(0,r.jsx)(n.td,{children:"Function to be evaluated in browser context until it returns a truthy value."})]}),(0,r.jsxs)(n.tr,{children:[(0,r.jsx)(n.td,{children:"options"}),(0,r.jsx)(n.td,{children:(0,r.jsx)(n.a,{href:"/api/puppeteer.framewaitforfunctionoptions",children:"FrameWaitForFunctionOptions"})}),(0,r.jsxs)(n.td,{children:[(0,r.jsx)(n.em,{children:"(Optional)"})," Options for configuring waiting behavior."]})]}),(0,r.jsxs)(n.tr,{children:[(0,r.jsx)(n.td,{children:"args"}),(0,r.jsx)(n.td,{children:"Params"}),(0,r.jsx)(n.td,{})]})]})]}),"\n",(0,r.jsx)(n.p,{children:(0,r.jsx)(n.strong,{children:"Returns:"})}),"\n",(0,r.jsxs)(n.p,{children:["Promise<",(0,r.jsx)(n.a,{href:"/api/puppeteer.handlefor",children:"HandleFor"}),"<Awaited<ReturnType<Func>>>>"]}),"\n",(0,r.jsx)(n.h2,{id:"example-1",children:"Example 1"}),"\n",(0,r.jsxs)(n.p,{children:[(0,r.jsx)(n.a,{href:"/api/puppeteer.page.waitforfunction",children:"Page.waitForFunction()"})," can be used to observe a viewport size change:"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"import puppeteer from 'puppeteer';\n(async () => {\n  const browser = await puppeteer.launch();\n  const page = await browser.newPage();\n  const watchDog = page.waitForFunction('window.innerWidth < 100');\n  await page.setViewport({width: 50, height: 50});\n  await watchDog;\n  await browser.close();\n})();\n"})}),"\n",(0,r.jsx)(n.h2,{id:"example-2",children:"Example 2"}),"\n",(0,r.jsxs)(n.p,{children:["Arguments can be passed from Node.js to ",(0,r.jsx)(n.code,{children:"pageFunction"}),":"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"const selector = '.foo';\nawait page.waitForFunction(\n  selector => !!document.querySelector(selector),\n  {},\n  selector\n);\n"})}),"\n",(0,r.jsx)(n.h2,{id:"example-3",children:"Example 3"}),"\n",(0,r.jsxs)(n.p,{children:["The provided ",(0,r.jsx)(n.code,{children:"pageFunction"})," can be asynchronous:"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{className:"language-ts",children:"const username = 'github-username';\nawait page.waitForFunction(\n  async username => {\n    const githubResponse = await fetch(\n      `https://api.github.com/users/${username}`\n    );\n    const githubUser = await githubResponse.json();\n    // show the avatar\n    const img = document.createElement('img');\n    img.src = githubUser.avatar_url;\n    // wait 3 seconds\n    await new Promise((resolve, reject) => setTimeout(resolve, 3000));\n    img.remove();\n  },\n  {},\n  username\n);\n"})})]})}function d(e={}){const{wrapper:n}={...(0,a.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(l,{...e})}):l(e)}},75251:(e,n,t)=>{var r=t(67294),a=Symbol.for("react.element"),i=Symbol.for("react.fragment"),o=Object.prototype.hasOwnProperty,s=r.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentOwner,c={key:!0,ref:!0,__self:!0,__source:!0};function p(e,n,t){var r,i={},p=null,l=null;for(r in void 0!==t&&(p=""+t),void 0!==n.key&&(p=""+n.key),void 0!==n.ref&&(l=n.ref),n)o.call(n,r)&&!c.hasOwnProperty(r)&&(i[r]=n[r]);if(e&&e.defaultProps)for(r in n=e.defaultProps)void 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