puppeteer/assets/js/87788213.9299413b.js

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method",description:"Signature:",source:"@site/../docs/api/puppeteer.executioncontext.evaluatehandle.md",sourceDirName:"api",slug:"/api/puppeteer.executioncontext.evaluatehandle",permalink:"/api/puppeteer.executioncontext.evaluatehandle",draft:!1,tags:[],version:"current",frontMatter:{},sidebar:"sidebar",previous:{title:"ExecutionContext.evaluate() method",permalink:"/api/puppeteer.executioncontext.evaluate"},next:{title:"ExecutionContext.frame() method",permalink:"/api/puppeteer.executioncontext.frame"}},i={},u=[{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}],c={toc:u};function s(e){let{components:t,...n}=e;return(0,r.kt)("wrapper",(0,a.Z)({},c,n,{components:t,mdxType:"MDXLayout"}),(0,r.kt)("h1",{id:"executioncontextevaluatehandle-method"},"ExecutionContext.evaluateHandle() method"),(0,r.kt)("b",null,"Signature:"),(0,r.kt)("pre",null,(0,r.kt)("code",{parentName:"pre",className:"language-typescript"},"evaluateHandle<Params extends unknown[], Func extends EvaluateFunc<Params> = EvaluateFunc<Params>>(pageFunction: Func | string, ...args: Params): Promise<HandleFor<Awaited<ReturnType<Func>>>>;\n")),(0,r.kt)("h2",{id:"parameters"},"Parameters"),(0,r.kt)("table",null,(0,r.kt)("thead",{parentName:"table"},(0,r.kt)("tr",{parentName:"thead"},(0,r.kt)("th",{parentName:"tr",align:null},"Parameter"),(0,r.kt)("th",{parentName:"tr",align:null},"Type"),(0,r.kt)("th",{parentName:"tr",align:null},"Description"))),(0,r.kt)("tbody",{parentName:"table"},(0,r.kt)("tr",{parentName:"tbody"},(0,r.kt)("td",{parentName:"tr",align:null},"pageFunction"),(0,r.kt)("td",{parentName:"tr",align:null},"Func ","|"," string"),(0,r.kt)("td",{parentName:"tr",align:null},"a function to be evaluated in the ",(0,r.kt)("code",null,"executionContext"))),(0,r.kt)("tr",{parentName:"tbody"},(0,r.kt)("td",{parentName:"tr",align:null},"args"),(0,r.kt)("td",{parentName:"tr",align:null},"Params"),(0,r.kt)("td",{parentName:"tr",align:null},"argument to pass to the page function")))),(0,r.kt)("b",null,"Returns:"),(0,r.kt)("p",null,"Promise","<",(0,r.kt)("a",{parentName:"p",href:"/api/puppeteer.handlefor"},"HandleFor"),"<","Awaited","<","ReturnType","<","Func",">",">",">",">"),(0,r.kt)("p",null,"A promise that resolves to the return value of the given function as an in-page object (a ",(0,r.kt)("a",{parentName:"p",href:"/api/puppeteer.jshandle"},"JSHandle"),")."),(0,r.kt)("h2",{id:"remarks"},"Remarks"),(0,r.kt)("p",null,"The only difference between ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.evaluate")," and ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.evaluateHandle")," is that ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.evaluateHandle")," returns an in-page object (a ",(0,r.kt)("a",{parentName:"p",href:"/api/puppeteer.jshandle"},"JSHandle"),"). If the function passed to the ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.evaluateHandle")," returns a Promise, then ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.evaluateHandle")," would wait for the promise to resolve and return its value."),(0,r.kt)("h2",{id:"example-1"},"Example 1"),(0,r.kt)("pre",null,(0,r.kt)("code",{parentName:"pre",className:"language-js"},"const context = await page.mainFrame().executionContext();\nconst aHandle = await context.evaluateHandle(() => Promise.resolve(self));\naHandle; // Handle for the global object.\n")),(0,r.kt)("h2",{id:"example-2"},"Example 2"),(0,r.kt)("p",null,"A string can also be passed in instead of a function."),(0,r.kt)("pre",null,(0,r.kt)("code",{parentName:"pre",className:"language-js"},"// Handle for the '3' * object.\nconst aHandle = await context.evaluateHandle('1 + 2');\n")),(0,r.kt)("h2",{id:"example-3"},"Example 3"),(0,r.kt)("p",null,"JSHandle instances can be passed as arguments to the ",(0,r.kt)("inlineCode",{parentName:"p"},"executionContext.* evaluateHandle"),":"),(0,r.kt)("pre",null,(0,r.kt)("code",{parentName:"pre",className:"language-js"},"const aHandle = await context.evaluateHandle(() => document.body);\nconst resultHandle = await context.evaluateHandle(body => body.innerHTML, * aHandle);\nconsole.log(await resultHandle.jsonValue()); // prints body's innerHTML\nawait aHandle.dispose();\nawait resultHandle.dispose();\n")))}s.isMDXComponent=!0}}]);