puppeteer/assets/js/eecd244f.1cfb05a7.js

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method"),(0,r.kt)("h4",a({},{id:"signature"}),"Signature:"),(0,r.kt)("pre",null,(0,r.kt)("code",a({parentName:"pre"},{className:"language-typescript"}),"class Frame {\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")),(0,r.kt)("h2",a({},{id:"parameters"}),"Parameters"),(0,r.kt)("table",null,(0,r.kt)("thead",{parentName:"table"},(0,r.kt)("tr",{parentName:"thead"},(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Parameter"),(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Type"),(0,r.kt)("th",a({parentName:"tr"},{align:null}),"Description"))),(0,r.kt)("tbody",{parentName:"table"},(0,r.kt)("tr",{parentName:"tbody"},(0,r.kt)("td",a({parentName:"tr"},{align:null}),"pageFunction"),(0,r.kt)("td",a({parentName:"tr"},{align:null}),"Func ","|"," 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",(0,r.kt)("code",null,"pageFunction"),".")))),(0,r.kt)("p",null,(0,r.kt)("strong",{parentName:"p"},"Returns:")),(0,r.kt)("p",null,"Promise","<",(0,r.kt)("a",a({parentName:"p"},{href:"/api/puppeteer.handlefor"}),"HandleFor"),"<","Awaited","<","ReturnType","<","Func",">",">",">",">"),(0,r.kt)("p",null,"the promise which resolve when the ",(0,r.kt)("inlineCode",{parentName:"p"},"pageFunction")," returns a truthy value."),(0,r.kt)("h2",a({},{id:"example"}),"Example"),(0,r.kt)("p",null,"The ",(0,r.kt)("inlineCode",{parentName:"p"},"waitForFunction")," can be used to observe viewport size change:"),(0,r.kt)("pre",null,(0,r.kt)("code",a({parentName:"pre"},{className:"language-ts"}),"import puppeteer from 'puppeteer';\n\n(async () => {\n.  const browser = await puppeteer.launch();\n.  const page = await browser.newPage();\n.  const watchDog = page.mainFrame().waitForFunction('window.innerWidth < 100');\n.  page.setViewport({width: 50, height: 50});\n.  await watchDog;\n.  await browser.close();\n})();\n")),(0,r.kt)("p",null,"To pass arguments from Node.js to the predicate of ",(0,r.kt)("inlineCode",{parentName:"p"},"page.waitForFunction")," function:"),(0,r.kt)("pre",null,(0,r.kt)("code",a({parentName:"pre"},{className:"language-ts"}),"const selector = '.foo';\nawait frame.waitForFunction(\n  selector => !!document.querySelector(selector),\n  {}, // empty options object\n  selector\n);\n")))}m.isMDXComponent=!0}}]);