puppeteer/assets/js/8d61a3b0.36fecfb3.js

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1",id:"example-1",level:2},{value:"Example 2",id:"example-2",level:2},{value:"Example 3",id:"example-3",level:2}],c={toc:s};function d(e){var{components:t}=e,a=l(e,["components"]);return(0,n.kt)("wrapper",r({},c,a,{components:t,mdxType:"MDXLayout"}),(0,n.kt)("h1",r({},{id:"pageevaluatehandle-method"}),"Page.evaluateHandle() method"),(0,n.kt)("h4",r({},{id:"signature"}),"Signature:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-typescript"}),"class Page {\n  evaluateHandle<\n    Params extends unknown[],\n    Func extends EvaluateFunc<Params> = EvaluateFunc<Params>\n  >(\n    pageFunction: Func | string,\n    ...args: Params\n  ): Promise<HandleFor<Awaited<ReturnType<Func>>>>;\n}\n")),(0,n.kt)("h2",r({},{id:"parameters"}),"Parameters"),(0,n.kt)("table",null,(0,n.kt)("thead",{parentName:"table"},(0,n.kt)("tr",{parentName:"thead"},(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Parameter"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Type"),(0,n.kt)("th",r({parentName:"tr"},{align:null}),"Description"))),(0,n.kt)("tbody",{parentName:"table"},(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"pageFunction"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Func ","|"," string"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"a function that is run within the page")),(0,n.kt)("tr",{parentName:"tbody"},(0,n.kt)("td",r({parentName:"tr"},{align:null}),"args"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"Params"),(0,n.kt)("td",r({parentName:"tr"},{align:null}),"arguments to be passed to the pageFunction")))),(0,n.kt)("p",null,(0,n.kt)("strong",{parentName:"p"},"Returns:")),(0,n.kt)("p",null,"Promise","<",(0,n.kt)("a",r({parentName:"p"},{href:"/next/api/puppeteer.handlefor"}),"HandleFor"),"<","Awaited","<","ReturnType","<","Func",">",">",">",">"),(0,n.kt)("h2",r({},{id:"remarks"}),"Remarks"),(0,n.kt)("p",null,"The only difference between ",(0,n.kt)("a",r({parentName:"p"},{href:"/next/api/puppeteer.page.evaluate"}),"page.evaluate")," and ",(0,n.kt)("inlineCode",{parentName:"p"},"page.evaluateHandle")," is that ",(0,n.kt)("inlineCode",{parentName:"p"},"evaluateHandle")," will return the value wrapped in an in-page object."),(0,n.kt)("p",null,"If the function passed to ",(0,n.kt)("inlineCode",{parentName:"p"},"page.evaluateHandle")," returns a Promise, the function will wait for the promise to resolve and return its value."),(0,n.kt)("p",null,"You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript):"),(0,n.kt)("h2",r({},{id:"example-1"}),"Example 1"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"const aHandle = await page.evaluateHandle('document');\n")),(0,n.kt)("h2",r({},{id:"example-2"}),"Example 2"),(0,n.kt)("p",null,(0,n.kt)("a",r({parentName:"p"},{href:"/next/api/puppeteer.jshandle"}),"JSHandle")," instances can be passed as arguments to the ",(0,n.kt)("inlineCode",{parentName:"p"},"pageFunction"),":"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"const aHandle = await page.evaluateHandle(() => document.body);\nconst resultHandle = await page.evaluateHandle(body => body.innerHTML, aHandle);\nconsole.log(await resultHandle.jsonValue());\nawait resultHandle.dispose();\n")),(0,n.kt)("p",null,"Most of the time this function returns a ",(0,n.kt)("a",r({parentName:"p"},{href:"/next/api/puppeteer.jshandle"}),"JSHandle"),", but if ",(0,n.kt)("inlineCode",{parentName:"p"},"pageFunction")," returns a reference to an element, you instead get an ",(0,n.kt)("a",r({parentName:"p"},{href:"/next/api/puppeteer.elementhandle"}),"ElementHandle")," back:"),(0,n.kt)("h2",r({},{id:"example-3"}),"Example 3"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"const button = await page.evaluateHandle(() =>\n  document.querySelector('button')\n);\n// can call `click` because `button` is an `ElementHandle`\nawait button.click();\n")),(0,n.kt)("p",null,"The TypeScript definitions assume that ",(0,n.kt)("inlineCode",{parentName:"p"},"evaluateHandle")," returns a ",(0,n.kt)("inlineCode",{parentName:"p"},"JSHandle"),", but if you know it's going to return an ",(0,n.kt)("inlineCode",{parentName:"p"},"ElementHandle"),", pass it as the generic argument:"),(0,n.kt)("pre",null,(0,n.kt)("code",r({parentName:"pre"},{className:"language-ts"}),"const button = await page.evaluateHandle<ElementHandle>(...);\n")))}d.isMDXComponent=!0}}]);