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< script > ! function ( ) { function t ( t ) { document . documentElement . setAttribute ( "data-theme" , t ) } var e = function ( ) { try { return new URLSearchParams ( window . location . search ) . get ( "docusaurus-theme" ) } catch ( t ) { } } ( ) || function ( ) { try { return localStorage . getItem ( "theme" ) } catch ( t ) { } } ( ) ; t ( null !== e ? e : "light" ) } ( ) , function ( ) { try { const c = new URLSearchParams ( window . location . search ) . entries ( ) ; for ( var [ t , e ] of c ) if ( t . startsWith ( "docusaurus-data-" ) ) { var a = t . replace ( "docusaurus-data-" , "data-" ) ; document . documentElement . setAttribute ( a , e ) } } catch ( t ) { } } ( ) < / script > < div id = "__docusaurus" > < div role = "region" aria-label = "Skip to main content" > < a class = "skipToContent_fXgn" href = "#__docusaurus_skipToContent_fallback" > Skip to main content< / a > < / div > < nav aria-label = "Main" class = "navbar navbar--fixed-top" > < div class = "navbar__inner" > < div class = "navbar__items" > < button aria-label = "Toggle navigation bar" aria-expanded = "false" class = "navbar__toggle clean-btn" type = "button" > < svg width = "30" height = "30" viewBox = "0 0 30 30" aria-hidden = "true" > < path stroke = "currentColor" stroke-linecap = "round" stroke-miterlimit = "10" stroke-width = "2" d = "M4 7h22M4 15h22M4 23h22" > < / path > < / svg > < / button > < a class = "navbar__brand" href = "/" > < div class = "navbar__logo" > < img src = "https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt = "Puppeteer Logo" class = "themedComponent_mlkZ themedComponent--light_NVdE" > < img src = "https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt = "Puppeteer Logo" class = "themedComponent_mlkZ themedComponent--dark_xIcU" > < / div > < b class = "navbar__title text--truncate" > Puppeteer< / b > < / a > < a class = "navbar__item navbar__link" href = "/next/" > Docs< / a > < a aria-current = "page" class = "navbar__item navbar__link navbar__link--active" href = "/next/api/puppeteer.puppeteernode" > Puppeteer API< / a > < a class = "navbar__item navbar__link" href = "/next/browsers-api/" > @puppeteer/browsers API< / a > < / div > < div class = "navbar__items navbar__items--right" > < div class = "navbar__item dropdown dropdown--hoverable dropdown--right" > < a class = "navbar__link" aria-haspopup = "true" aria-expanded = "false" role = "button" href = "/next/" > Next< / a > < ul class = "dropdown__menu" > < li > < a aria-current = "page" class = "dropdown__link dropdown__link--active" href = "/next/api/puppeteer.page.evaluateonnewdocument" > Next< / a > < / li > < li > < a class = "dropdown__link" href = "/api/puppeteer.page.evaluateonnewdocument" > 21.6.1< / a > < / li > < li > < hr class = "dropdown-separator" > < / li > < li class = "dropdown-archived-versions" > < b > Archived versions< / b > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v21.6.0/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 21.6.0< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v21.5.2/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 21.5.2< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v21.5.1/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 21.5.1< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v21.5.0/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 21.5.0< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21
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< p > Adds a function which would be invoked in one of the following scenarios:< / p >
< ul >
< li >
< p > whenever the page is navigated< / p >
< / li >
< li >
< p > whenever the child frame is attached or navigated. In this case, the function is invoked in the context of the newly attached frame.< / p >
< / li >
< / ul >
< p > The function is invoked after the document was created but before any of its scripts were run. This is useful to amend the JavaScript environment, e.g. to seed < code > Math.random< / code > .< / p >
< h4 class = "anchor anchorWithStickyNavbar_LWe7" id = "signature" > Signature:< a href = "#signature" class = "hash-link" aria-label = "Direct link to Signature:" title = "Direct link to Signature:" > < / a > < / h4 >
< div class = "language-typescript codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-typescript codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token keyword" style = "color:#00009f" > class< / span > < span class = "token plain" > < / span > < span class = "token class-name" > Page< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > abstract< / span > < span class = "token plain" > evaluateOnNewDocument< / span > < span class = "token operator" style = "color:#393A34" > < < / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > Params < / span > < span class = "token keyword" style = "color:#00009f" > extends< / span > < span class = "token plain" > < / span > < span class = "token class-name builtin" > unknown< / span > < span class = "token punctuation" style = "color:#393A34" > [< / span > < span class = "token punctuation" style = "color:#393A34" > ]< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > Func < / span > < span class = "token keyword" style = "color:#00009f" > extends< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token operator" style = "color:#393A34" > ...< / span > < span class = "token plain" > args< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Params< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token function-variable function" style = "color:#d73a49" > unknown< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token operator" style = "color:#393A34" > ...< / span > < span class = "token plain" > args< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Params< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token builtin" > unknown< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > pageFunction< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Func < / span > < span class = "token operator" style = "color:#393A34" > |< / span > < span class = "token plain" > < / span > < span class = "token builtin" > string< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > ...< / span > < span class = "token plain" > args< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > Params< / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token pla
< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "parameters" > Parameters< a href = "#parameters" class = "hash-link" aria-label = "Direct link to Parameters" title = "Direct link to Parameters" > < / a > < / h2 >
< table > < thead > < tr > < th > Parameter< / th > < th > Type< / th > < th > Description< / th > < / tr > < / thead > < tbody > < tr > < td > pageFunction< / td > < td > Func | string< / td > < td > Function to be evaluated in browser context< / td > < / tr > < tr > < td > args< / td > < td > Params< / td > < td > Arguments to pass to < code > pageFunction< / code > < / td > < / tr > < / tbody > < / table >
< p > < strong > Returns:< / strong > < / p >
< p > Promise< < a href = "/next/api/puppeteer.newdocumentscriptevaluation" > NewDocumentScriptEvaluation< / a > > < / p >
< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "example" > Example< a href = "#example" class = "hash-link" aria-label = "Direct link to Example" title = "Direct link to Example" > < / a > < / h2 >
< p > An example of overriding the navigator.languages property before the page loads:< / p >
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< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token comment" style = "color:#999988;font-style:italic" > // preload.js< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" style = "display:inline-block" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // overwrite the `languages` property to use a custom getter< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > Object< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > defineProperty< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > navigator< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < span class = "token string" style = "color:#e3116c" > ' languages' < / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token function-variable function" style = "color:#d73a49" > get< / span > < span class = "token operator" style = "color:#393A34" > :< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > function< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > return< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > [< / span > < span class = "token string" style = "color:#e3116c" > ' en-US' < / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < span class = "token string" style = "color:#e3116c" > ' en' < / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < span class = "token string" style = "color:#e3116c" > ' bn' < / span > < span class = "token punctuation" style = "color:#393A34" > ]< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > }< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > }< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" style = "display:inline-block" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // In your puppeteer script, assuming the preload.js file is< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:it
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< / body >
< / html >
