puppeteer/api/puppeteer.elementhandle._eval/index.html

26 lines
87 KiB
HTML
Raw Normal View History

<!doctype html>
<html lang="en" dir="ltr" class="docs-wrapper plugin-docs plugin-id-default docs-version-21.11.0 docs-doc-page docs-doc-id-api/puppeteer.elementhandle._eval" data-has-hydrated="false">
<head>
<meta charset="UTF-8">
<meta name="generator" content="Docusaurus v3.0.1">
<title data-rh="true">ElementHandle.$eval() method | Puppeteer</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://pptr.dev/api/puppeteer.elementhandle._eval"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:counter" content="2"><meta data-rh="true" property="og:title" content="ElementHandle.$eval() method | Puppeteer"><meta data-rh="true" name="description" content="Runs the given function on the first element matching the given selector in the current element."><meta data-rh="true" property="og:description" content="Runs the given function on the first element matching the given selector in the current element."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://pptr.dev/api/puppeteer.elementhandle._eval"><link data-rh="true" rel="alternate" href="https://pptr.dev/api/puppeteer.elementhandle._eval" hreflang="en"><link data-rh="true" rel="alternate" href="https://pptr.dev/api/puppeteer.elementhandle._eval" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://DVKY664LG7-dsn.algolia.net" crossorigin="anonymous"><link rel="search" type="application/opensearchdescription+xml" title="Puppeteer" href="/opensearch.xml">
<script src="/fix-location.js"></script><link rel="stylesheet" href="/assets/css/styles.10908b84.css">
<script src="/assets/js/runtime~main.108fb287.js" defer="defer"></script>
<script src="/assets/js/main.918bfd7a.js" defer="defer"></script>
</head>
<body class="navigation-with-keyboard">
<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="/">Docs</a><a aria-current="page" class="navbar__item navbar__link navbar__link--active" href="/api/puppeteer.puppeteernode">Puppeteer API</a><a class="navbar__item navbar__link" href="/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="/">21.11.0</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/next/api/puppeteer.elementhandle._eval">Next</a></li><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/api/puppeteer.elementhandle._eval">21.11.0</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-v21.10.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">21.10.0<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-v21.9.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">21.9.0<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-v21.8.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">21.8.0<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-v21.7.0/docs/api/index.md" target="_blank" rel="noopener noreferrer" class="dropdown__link">21.7.0<svg width="12" height="12" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h1
<p>Runs the given function on the first element matching the given selector in the current element.</p>
<p>If the given function returns a promise, then this method will wait till the promise resolves.</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">ElementHandle</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 generic-function function" style="color:#d73a49">$eval</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><span class="token generic-function generic class-name"> Selector </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">string</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">,</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><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"></span><br></span><span class="token-line" style="color:#393A34"><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"> EvaluateFuncWith</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">NodeFor</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Selector</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token generic-function generic class-name punctuation" style="color:#393A34">,</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"> EvaluateFuncWith</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name"></span><br></span><span class="token-line" style="color:#393A34"><span class="token generic-function generic class-name"> NodeFor</span><span class="token generic-function generic class-name operator" style="color:#393A34">&lt;</span><span class="token generic-function generic class-name">Selector</span><span class="token generic-function generic class-name operator" style="color:#393A34">&gt;</span><span class="token
<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>selector</td><td>Selector</td><td>The selector to query for.</td></tr><tr><td>pageFunction</td><td>Func | string</td><td>The function to be evaluated in this element&#x27;s page&#x27;s context. The first element matching the selector will be passed in as the first argument.</td></tr><tr><td>args</td><td>Params</td><td>Additional arguments to pass to <code>pageFunction</code>.</td></tr></tbody></table>
<p><strong>Returns:</strong></p>
<p>Promise&lt;Awaited&lt;ReturnType&lt;Func&gt;&gt;&gt;</p>
<p>A promise to the result of the function.</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>
<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 keyword" style="color:#00009f">const</span><span class="token plain"> tweetHandle </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> page</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">$</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;.tweet&#x27;</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 function" style="color:#d73a49">expect</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> tweetHandle</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">$eval</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;.like&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> node </span><span class="token operator" style="color:#393A34">=&gt;</span><span class="token plain"> node</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">innerText</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">toBe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;100&#x27;</span><span class="token punctuation" style="color:#393A34">)</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token function" style="color:#d73a49">expect</span><span class="token punctuation" style="color:#393A34">(</span><span class="token keyword" style="color:#00009f">await</span><span class="token plain"> tweetHandle</span><span class="token punctuation" style="color:#393A34">.</span><span class="token function" style="color:#d73a49">$eval</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;.retweets&#x27;</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> node </span><span class="token operator" style="color:#393A34">=&gt;</span><span class="token plain"> node</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">innerText</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 function" style="color:#d73a49">toBe</span><span class="token punctuation" style="color:#393A34">(</span><span class="token string" style="color:#e3116c">&#x27;10&#x27;</span><span class="token punctuation" style="color:#393A34">)</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-
</body>
</html>