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<title data-rh="true">Page.waitForFunction() method | Puppeteer</title><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://pptr.dev/api/puppeteer.page.waitforfunction"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Page.waitForFunction() method | Puppeteer"><meta data-rh="true" name="description" content="The waitForFunction can be used to observe viewport size change:"><meta data-rh="true" property="og:description" content="The waitForFunction can be used to observe viewport size change:"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://pptr.dev/api/puppeteer.page.waitforfunction"><link data-rh="true" rel="alternate" href="https://pptr.dev/api/puppeteer.page.waitforfunction" hreflang="en"><link data-rh="true" rel="alternate" href="https://pptr.dev/api/puppeteer.page.waitforfunction" hreflang="x-default"><link rel="stylesheet" href="/assets/css/styles.39576fb3.css">
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class="menu__link" tabindex="0" href="/api/puppeteer.page.deletecookie">deletecookie</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulate">emulate</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatecputhrottling">emulatecputhrottling</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulateidlestate">emulateidlestate</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatemediafeatures">emulatemediafeatures</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatemediatype">emulatemediatype</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatenetworkconditions">emulatenetworkconditions</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatetimezone">emulatetimezone</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.emulatevisiondeficiency">emulatevisiondeficiency</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.evaluate">evaluate</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.evaluatehandle">evaluatehandle</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.evaluateonnewdocument">evaluateonnewdocument</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.exposefunction">exposefunction</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.focus">focus</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.frames">frames</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.goback">goback</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.goforward">goforward</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.goto">goto</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.hover">hover</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.isclosed">isclosed</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.isdraginterceptionenabled">isdraginterceptionenabled</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.isjavascriptenabled">isjavascriptenabled</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.keyboard">keyboard</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.mainframe">mainframe</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.metrics">metrics</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.mouse">mouse</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.off">off</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.on">on</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.once">once</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.pdf">pdf</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.queryobjects">queryobjects</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.reload">reload</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.screenshot">screenshot</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.select">select</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setbypasscsp">setbypasscsp</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setcacheenabled">setcacheenabled</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setcontent">setcontent</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setcookie">setcookie</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setdefaultnavigationtimeout">setdefaultnavigationtimeout</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setdefaulttimeout">setdefaulttimeout</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setdraginterception">setdraginterception</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setextrahttpheaders">setextrahttpheaders</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setgeolocation">setgeolocation</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setjavascriptenabled">setjavascriptenabled</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setofflinemode">setofflinemode</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setrequestinterception">setrequestinterception</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setuseragent">setuseragent</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.setviewport">setviewport</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.tap">tap</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.target">target</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.title">title</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.touchscreen">touchscreen</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.tracing">tracing</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.type">type</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.url">url</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.viewport">viewport</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforfilechooser">waitforfilechooser</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforframe">waitforframe</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" tabindex="0" href="/api/puppeteer.page.waitforfunction">waitforfunction</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitfornavigation">waitfornavigation</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitfornetworkidle">waitfornetworkidle</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforrequest">waitforrequest</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforresponse">waitforresponse</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforselector">waitforselector</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforselector_1">waitforselector_1</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitfortimeout">waitfortimeout</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.waitforxpath">waitforxpath</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.page.workers">workers</a></li></ul></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.pageemittedevents">pageemittedevents</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.pageeventobject">pageeventobject</a><button aria-label="Toggle the collapsible sidebar category &#x27;pageeventobject&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.paperformat">paperformat</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.pdfmargin">pdfmargin</a><button aria-label="Toggle the collapsible sidebar category &#x27;pdfmargin&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.pdfoptions">pdfoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;pdfoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.permission">permission</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.platform">platform</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.point">point</a><button aria-label="Toggle the collapsible sidebar category &#x27;point&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.pressoptions">pressoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;pressoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.product">product</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.productlauncher">productlauncher</a><button aria-label="Toggle the collapsible sidebar category &#x27;productlauncher&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.protocolerror">protocolerror</a><button aria-label="Toggle the collapsible sidebar category &#x27;protocolerror&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.protocollifecycleevent">protocollifecycleevent</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.puppeteer">puppeteer</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteer&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.puppeteererrors">puppeteererrors</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteererrors&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.puppeteerlaunchoptions">puppeteerlaunchoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteerlaunchoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.puppeteerlifecycleevent">puppeteerlifecycleevent</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.puppeteernode">puppeteernode</a><button aria-label="Toggle the collapsible sidebar category &#x27;puppeteernode&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.puppeteernodelaunchoptions">puppeteernodelaunchoptions</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.registercustomqueryhandler">registercustomqueryhandler</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.remoteaddress">remoteaddress</a><button aria-label="Toggle the collapsible sidebar category &#x27;remoteaddress&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.resourcetype">resourcetype</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.responseforrequest">responseforrequest</a><button aria-label="Toggle the collapsible sidebar category &#x27;responseforrequest&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.screenshotclip">screenshotclip</a><button aria-label="Toggle the collapsible sidebar category &#x27;screenshotclip&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.screenshotoptions">screenshotoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;screenshotoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" 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href="/api/puppeteer.snapshotoptions">snapshotoptions</a><button aria-label="Toggle the collapsible sidebar category &#x27;snapshotoptions&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-2 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" tabindex="0" href="/api/puppeteer.target">target</a><button aria-label="Toggle the collapsible sidebar category &#x27;target&#x27;" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" href="/api/puppeteer.targetfiltercallback">targetfiltercallback</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-2 menu__list-item"><a class="menu__link" tabindex="0" 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0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/api/"><span itemprop="name">API</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/api/puppeteer.page"><span itemprop="name">page</span></a><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">waitforfunction</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_aoJ5"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Page.waitForFunction() method</h1><p>The <code>waitForFunction</code> can be used to observe viewport size change:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">const puppeteer = require(&#x27;puppeteer&#x27;);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">(async () =&gt; {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const browser = await puppeteer.launch();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const page = await browser.newPage();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const watchDog = page.waitForFunction(&#x27;window.innerWidth &lt; 100&#x27;);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await page.setViewport({ width: 50, height: 50 });</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await watchDog;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await browser.close();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">})();</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>To pass arguments from node.js to the predicate of <code>page.waitForFunction</code> function:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">const selector = &#x27;.foo&#x27;;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await page.waitForFunction(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">(selector) =&gt; !!document.querySelector(selector),</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">{},</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">selector</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">);</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>The predicate of <code>page.waitForFunction</code> can be asynchronous too:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token plain">const username = &#x27;github-username&#x27;;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await page.waitForFunction(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">async (username) =&gt; {</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const githubResponse = await fetch(</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> `https://api.github.com/users/${username}`</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const githubUser = await githubResponse.json();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// show the avatar</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">const img = document.createElement(&#x27;img&#x27;);</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">img.src = githubUser.avatar_url;</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">// wait 3 seconds</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">await new Promise((resolve, reject) =&gt; setTimeout(resolve, 3000));</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">img.remove();</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">},</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">{},</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">username</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">);</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><strong>Signature:</strong></p><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"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token generic-function function" style="color:#d73a49">waitForFunction</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Params </span><span class="token generic-function generic class-name keyword" style="color:#00009f">extends</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name builtin">unknown</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">[</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">]</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">,</span><span class="token generic-function generic class-name"> Func </span><span class="token generic-function generic class-name keyword" style="color:#00009f">extends</span><span class="token generic-function generic class-name"> EvaluateFunc</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Params</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token generic-function generic class-name"> </span><span class="token generic-function generic class-name operator" style="color:#393A34">=</span><span class="token generic-function generic class-name"> EvaluateFunc</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Params</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;&gt;</span><span class="token punctuation" style="color:#393A34">(</span><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"> options</span><span class="token operator" style="color:#393A34">?</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 plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> timeout</span><span class="token operator" style="color:#393A34">?</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">number</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"> polling</span><span class="token operator" style="color:#393A34">?</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">string</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">|</span><span class="token plain"> </span><span class="token builtin">number</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><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 operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token builtin">Promise</span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">HandleFor</span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">Awaited</span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">ReturnType</span><span class="token operator" style="color:#393A34">&lt;</span><span class="token plain">Func</span><span class="token operator" style="color:#393A34">&gt;&gt;&gt;</span><span class="token operator" style="color:#393A34">&gt;</span><span class="token punctuation" style="color:#393A34">;</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="parameters">Parameters<a class="hash-link" href="#parameters" title="Direct link to heading">​</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>options</td><td>{ timeout?: number; polling?: string <!-- -->|<!-- --> number; }</td><td><i>(Optional)</i> Optional waiting parameters</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<!-- -->&lt;<a href="/api/puppeteer.handlefor">HandleFor</a>&lt;<!-- -->Awaited<!-- -->&lt;<!-- -->ReturnType<!-- -->&lt;<!-- -->Func<!-- -->&gt;<!-- -->&gt;<!-- -->&gt;<!-- -->&gt;</p><p>Promise which resolves when the <code>pageFunction</code> returns a truthy value. It resolves to a JSHandle of the truthy value.</p><p>The optional waiting parameter can be:</p><ul><li><p><code>Polling</code>: An interval at which the <code>pageFunction</code> is executed, defaults to <code>raf</code>. If <code>polling</code> is a number, then it is treated as an interval in milliseconds at which the function would be executed. If polling is a string, then it can be one of the following values:<br> - <code>raf</code>: to constantly execute <code>pageFunction</code> in <code>requestAnimationFrame</code> callback. This is the tightest polling mode which is suitable to observe styling changes.<br> - <code>mutation</code>: to execute pageFunction on every DOM mutation.</p></li><li><p><code>timeout</code>: maximum time to wait for in milliseconds. Defaults to <code>30000</code> (30 seconds). Pass <code>0</code> to disable timeout. The default value can be changed by using the <a href="/api/puppeteer.page.setdefaulttimeout">page.setDefaultTimeout(timeout)</a> method.</p></li></ul></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/api/puppeteer.page.waitforframe"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Page.waitForFrame() method</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/api/puppeteer.page.waitfornavigation"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Page.waitForNavigation() method</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#parameters" class="table-of-contents__link toc-highlight">Parameters</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Community</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/puppeteer" target="_blank" rel="noopener noreferrer" class="footer__link-item">Stack Overflow<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><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 class="footer__item"><a href="https://twitter.com/chromedevtools" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><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 class="footer__item"><a href="https://goo.gle/devtools-youtube" target="_blank" rel="noopener noreferrer" class="footer__link-item">YouTube<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_lCJq"><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></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2022 Google, Inc.</div></div></div></footer></div>
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