Puppeteer pass function to evaluate I just get this error: Sep 18, 2021 · puppeteer give arguments evaluate pass args to evaluate puppeteer puppeteer evaluate parameter pass variable down to page. The function is invoked after the document was created but before any of its scripts were run. Dec 17, 2019 · I'm getting multiple errors with page. Jul 11, 2018 · Serializable|JSHandle> Arguments to pass to pageFunction returns: < Promise < Serializable >> Promise which resolves to the return value of pageFunction This method runs Array. I want to pass the existing logger object that I already have instantiated. My algorithm: Login Open URL Get ul Loop over each li and cli Nov 24, 2019 · I had this exact issue relating to puppeteer and pkg. Here's a contrived example: Here's a contrived example: const obj = { thing: 'thing1', }; const myfunction = () => { return `great ${stuff}`; }; await page. e. How do I scrape the page after entering await page. evaluate, Puppeteer serializes them to JSON. 0; What steps will reproduce the problem? I am using react-chat-widget and want to run one of it's functions addUserMessage through puppeteer on the accessed page. In Puppeteer, the page. evaluate() 10. This applies to all instances of puppeteer functions operating within the context of browser. In the latest version args has been replaced with _args. Puppeteer page. — this can be mitigated a bit by using Function. Puppeteer allows evaluating JavaScript functions in the context of the page driven by Puppeteer: // Close browser. As moment is a function and a function cannot be serialized you cannot use it that easy. evaluate() method in Pyppeteer takes a string of JavaScript. Although, it… Aug 18, 2020 · By reading the puppeteer's documentation, you can see where we can insert parameters. Those could be the same Mar 28, 2019 · When you pass puppeteer a string, we try to evaluate it as an expression not a function definition. $(". Puppeteer: use function inside page. json'); ? Page. open(url, function() { var foo = 42; page. I have an array containing the variables i need to use but lets say i wanna check the second table manually using a variable, here's how i approached the problem Dec 18, 2019 · While learning and practicing with puppeteer I run into a problem that I thought was difficult to solve. evaluate() function allows you to execute custom JavaScript on a web page within the browser. evaluate, call the md5 function to hash a string and log the result to the console. I need that until the javascript function is executed and finished it does not pass to another instruction, but I do not know the syntax to use. You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript): Example 1 Unfortunately, page. Ask Question Asked 2 years, 8 months ago. js script scope. I was using something that looks like this below async function start() { let item = {cin: "1234567" page. evaluate puppeteer. I am trying to convert a function that is used in puppeteer to puppeteerSharp and i am wondering how to do it. evaluate(async => { // await some promise }); Is there an equivalent in PuppeteerSharp? Using EvaluateFunctionAsync, the task completes before the promise resolves: await page. evaluate was once capable of taking parameters to use inside the browser. js version: v12. evaluate() method. Apr 8, 2018 · I obviously don't want to have a bunch of functions with the selectors hard coded I want to pass it in to the page evaluate. evaluate(): await myFunc(); return true; Page. Puppeteer: page. evaluate ( '(' + myFunction . wait for setTImeout in page. js and returns a Promise which resolves to the return value of puppeteerFunction. How to pass a function in Puppeteers . Puppeteer - How to evaluate XPath which returns text? 1. com' with the URL of the webpage you want to interact with. evaluate((a, b) => { return a + b; }, 1, 2); console. Pass a function to evaluate() in puppeteer. evaluate() or page. We can pass a function as an argument to the evaluate function that will be executed within the page's context. evaluate() function, you need to ensure that the variable is correctly referenced within the function. 0 What steps will reproduce the problem? function inner { return 'h CSS selectors can be passed as-is and a Puppeteer-specific selector syntax allows querying by text, a11y role and name, and xpath and combining these queries across shadow roots. Try this: Puppeteer: pass variable in . Signature The evaluate function in Puppeteer allows us to run JavaScript code within the context of a web page. querySelector('. querySelector('input[name="q"]'). May 16, 2019 · UPDATE I am running in docker and using puppeteer version 1. evaluate cannot exposeFunction with args. Nov 7, 2018 · Is it possible to pass a function to Puppeteer's page. How to await an async function evaluation in Nov 13, 2019 · The anonymous function which is the first argument to the page. another-element") awai Jun 2, 2019 · You can only pass serializable data to the page. It is returning undefined - which according to the docs I think is for a good reason (non-serializable). On the host page a listener works like: Sep 11, 2019 · Hi I am working on a web scraping script, and I have a function that currently returns to me a string. The way to do this is the following: Set up a file with your evaluate function: // evaluate. I have a function called getContent() which I need to pass parameters to from a foreach loop in evaluate() but if I try to pass the function using that syntax ex: page. evaluate() Puppeteer evaluate function; allow to pass a parameterized funciton as a string to page. May 7, 2025 · Is it possible to pass a function to Puppeteer's page. exposeFunction() Pass a function to evaluate() in puppeteer. This method allows you to compute MD5 hashes directly within the page context, leveraging Puppeteer's page. Return types . The solution that worked for me was to pass a string to evaluate rather than a function: ¥Although the function is defined in your script context, it actually gets converted to a string by Puppeteer, sent to the target page and evaluated there. Jun 13, 2020 · Pass a function to evaluate() in puppeteer. – Jul 23, 2018 · The Puppeteer function page. It's signature looks like this: Dec 23, 2018 · Puppeteer evaluate function. eval is not a function. 0 Platform / OS version: MacOS 10. js context and the browser context. js 库，提供了丰富的 API 接口，能够帮助开发者高效地处理动态网页数据。本文将重点讲解 Puppeteer 的 evaluate 函数，结合代理 IP 技术，演示如何采集目标网站（如界面新闻）上的文章标题和摘要。 Sep 20, 2020 · A page function is a function that Puppeteer (through NodeJS) turns into a string, sends to the browser, and then runs inside the Chromium instance. 14. evaluate() method is a powerful feature in Puppeteer that allows you to run JavaScript inside the context of the browser. toString()); Dec 5, 2019 · How can I pass variable into an evaluate function that evaluates an async function using Puppeteer? Hot Network Questions How does the taste of a burrata made of buffalo milk differ from the taste of a burrata made of cow milk? Apr 5, 2020 · From the docs:. The evaluate function does not run when called. Make sure to replace 'https://example. calls because they thought they had to. 你可以传递字符串而不是函数（尽管建议使用函数，因为它们更容易调试并与 TypeScript 一起使用）： If the function passed to page. exposeFunction but that seems to be for an anonymous function that is created inline. evaluate() when you are seeking to interact with the page directly in the page DOM environment by passing a function and returning a <Promise<Serializable>> which resolves to the return value of the passed function. evaluate ( '1 + 2' ) ; Apr 13, 2019 · I've seen a good number of Puppeteer scripts in a state of confusion as the author tried to translate their working console code to page. Feb 5, 2024 · On the other hand, Puppeteer uses object for passing options to methods. height]; }, createHdpiCanvas. ¥Evaluates a function in the page's context and returns the result. Close Browser: Finally, close the browser with browser. Oct 28, 2019 · To execute JavaScript code on your puppeteer instance, you can use the provided evaluate method. We can see that the parameters are a spreaded array (args) that is received in last. How to pass array and function to Page May 8, 2022 · Some of these functions are used by the main program (outside of puppeteer) too, since they are utility functions. Could you help me? what do I have to put in order to get the content of the div resultDIV? Part of my code: Adds a function which would be invoked in one of the following scenarios: whenever the page is navigated. Nov 29, 2024 · In Puppeteer, when you're passing a variable into the page. headline'). Dec 13, 2022 · Puppeteer：在 . Easy fix: const result = await browser . Dec 12, 2020 · Take a a look at the Puppeteer documentation for page. If the function passed to page. We can create a simple wrapper or use browserify to overcome this problem for now. Jul 23, 2023 · page. evaluate ( '1 + 2' ) ; Nov 13, 2018 · Steps to reproduce Tell us about your environment: Puppeteer version: 1. The functions you evaluate can return values. innerText) to avoid having to pass it as a second parameter. It signals to the web browser a string called a "fragment" that targets an anchor on a web page. evaluate(), but when I run the script it throws a following error: Error: Evaluation failed: TypeError: Cannot read property 'p1' of undefined. evaluate() method? How can I dynamically inject functions to evaluate using Puppeteer? If the function passed to page. CSS selectors can be passed as-is and a Puppeteer-specific selector syntax allows querying by text, a11y role and name, and xpath and combining these queries across shadow roots. evaluate returns a non-[Serializable] value, then page. Everything works fine unless I define the necessary variable before I call the . close(). launch({args: ['--no-sandbox Dec 27, 2024 · Passing Variables into Puppeteer's page. – ggorlen. Here is a working snippet, don't hesitate to pass {headless: false} to puppeteer. The function to be evaluated in the element's page's context. evaluate((obj, function)=>{ const thing = myfunction; },(obj Jan 11, 2018 · Puppeteer: pass variable in . Additional arguments to pass to pageFunction. evaluate cannot directly reference variables from the Node. goto('blahblahblah. log(sum); // Outputs: 3 Returning Complex Objects. It means that the function cannot access scope variables or call other functions defined in your Puppeteer script, and you need to define the entire function logic within the function body. exposeFunction. textContent, // 1. You signed in with another tab or window. The thing is, that entry page in question doesn’t render a title meta element: Evaluating the title meta element. Puppeteer: How to evaluate xpath with document. page. I'm trying to scrape a bunch of tables on a page with Puppeteer but the amount of tables varies each time and therefore i need to pass a variable into the page. How can I pass an existing object into Puppeteer's page. querySelectorAll(selector)) within the page and passes it as the first argument to pageFunction . 11. Mar 9, 2025 · The evaluateHandle method in Puppeteer is a powerful tool for evaluating functions within the context of a page and obtaining a handle to the result. js version: v11. exposeFunction makes it easier to pass data back to Node from your MutationObserver or trigger a callback than console. Returns: Promise<Awaited<ReturnType<Func>>> The result of func. evaluate() function is a versatile tool for executing JavaScript within a page's execution context. 1. execute block. Apr 26, 2025 · You can pass arguments to the function executed by page. Dec 29, 2024 · I wouldn't call resorting to evaluate a hack, since Puppeteer doesn't pretend to offer helpers for everything, but you're right that abusing console. evaluae((getContent()) => it does not work. Oct 28, 2019 · A better puppeteer evaluate For that reason I published a little library(my first) that lets me do just that: Aptly named puppeteer-evaluate2, it allows me to write my puppeteer callback code like any other JavaScript code, where closures/imports are available. It provides a powerful way to interact with the page's DOM and extract information. exposeFunction is limited to serialized data as the other answer already points out. evaluate(`async() => { return Promise. evaluate function as argument. I explored page. evaluate would wait for the promise to resolve and return its value. However, this might Mar 23, 2012 · My problem is that the code I pass to the webkit page is sandboxed, and so has no access to the variables of my main phantom script. evaluate(), you should include it as an additional parameter. I am using the evaluate function to return links within a drop down in our application. most classes), then evaluate will _likely_ return some truncated value (or {}). Try this way. Mar 20, 2022 · For instance, if i needed to do document. evaluate() method Evaluates a function in the page's context and returns the result. Jan 13, 2023 · You signed in with another tab or window. Anyway, it turns out that Puppeteer’s website has an entry page, which immediately redirects us to the well-known website’s index page. evaluate() method in Puppeteer takes JavaScript raw function (or string of JavaScript expression). evaluate; Functions bound with page. 10. trim() to execute in node/puppeteer context as exposeFunction allows. alljobs is an array I'm trying to push objects to. prototype. evaluate() call where it expects a string. The code inside page. evaluate isn't a part of you code, and you can't call a function of your code from it. evaluate((createHdpiCanvasCode) => { const createHdpiCanvas = new Function(`return ${createHdpiCanvasCode}`)(); const canvas = createHdpiCanvas(); return [canvas. When navigating to Puppeteer’s website, the title element is evaluated as an empty Mar 31, 2021 · Puppeteer: use function inside page. Wherever he has his await page. Dec 8, 2018 · You could pass createHdpiCanvas as a parameter, however a function is not serialisable so you would have to do it yourself: page. evaluate. When returning complex objects from page. This handle can be a JSHandle or an ElementHandle, depending on the return value of the function. Aug 31, 2021 · puppeteer evaluate functional with callback. evaluateHandle(pageFunction, args) Remarks: The only difference between page. This is useful for parameterizing your scripts: const sum = await page. 1 (18B75) URLs (if applicable): Node. evaluate((s) => { let dom = document. Nov 30, 2023 · The Puppeteer page. js window. evaluate ( '1 + 2' ) ; You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript): Example 2 const aHandle = await page . Here is the puppeteer function(th Mar 2, 2018 · In Pupeteer, I'd like to pass an arbitrary number of ElementHandle to the method evaluate in an array: const element1=await page. – Kevin. I want to implement a functionality where if a certain value is found on page it should play a music. resolve(42); }`); (puppeteer will call . evaluate() can only transfer serializable values (roughly, the values JSON can handle). Because of that, if you want to use an outside variable (a selector, for example) inside the function, you have to pass that variable as an argument to evaluate: Jan 16, 2018 · Puppeteer: pass variable in . Oct 9, 2017 · All I want is to be able to pass a parameterised function as a string to the page. Jun 25, 2020 · Puppeteer version: 4. Then, inside the page. Right not, it it not taking any arguments. js environment; you need to explicitly pass them as arguments. Puppeteer version: 1. await page. Jan 8, 2018 · Puppeteer has changed the way evaluate works, the safest way to retrieve DOM elements is by creating a JSHandle, and passing that handle to the evaluate function: Jun 8, 2020 · I can think of two dubious and inconvenient solutions. To expose a function to the page from your Node. However, as soon as I build the source with pkg - page. I imported the function in my test file and passed it as a variable through Is it possible to pass a function to Puppeteer's page. log('hello') in your page function, it will log it to the console in the browser. async function browser(){ const browser = await puppeteer. Dec 10, 2022 · This code can pass a variable inside evaluate(). evaluate a table into an array. When working with Puppeteer for web automation, it's crucial to grasp the distinction between the Node. 1 Nov 5, 2019 · I have some URL parameters that I need to pass to Puppeteer via query strings. Aug 26, 2019 · The function you pass to evaluate is not a closure. But I think I see what you are getting at. How c Mar 21, 2025 · Page Context Explained. evaluate()? You can call evaluate on the handle directly: someHandle. As it has previously been said, it's a pain not being able to select an element based on its text content (which often a lot), or to select nodes based on ancestors predicates ( for instant //*[@Class='whateverclass'][not(ancestor::div[@id='abcdef'])] ) If the function passed to the page. Aug 27, 2018 · First, it is important to understand that there are two main environments: Node. evaluate(pageFunction[, args]) As you can see you can pass arguments to the pageFunction as additional paramateters when calling page. Jul 1, 2022 · I am using puppeteer and the script works fine when executing directly with node. Nov 19, 2021 · This is the function signature of puppeteer's page. evaluate, e. How can I pass a string in and have that string be available inside of my page. evaluate((keyword) => { document. evaluate (() => document . evaluateHandle is that evaluateHandle will return the value wrapped in an in-page object. pageFunction <function|string> Function to be evaluated in the page context. This method is widely used for interacting with the web page as though a real user would, but through automated scripts. Feb 16, 2022 · The only way I know how to make this work is to pass in a path to a file that contains your function to puppeteer. – Oct 15, 2019 · Puppeteer 是一个用于控制 Chromium 或 Chrome 浏览器的 Node. puppeteer page. When running the pageFunction, it Jan 2, 2020 · I've run into a situation that I do not understand. However, it’s not. const title = await page . Description. evaluateHandle() and you want to get the console. evaluate() Function. For instance, if I +1 , I , would like too XPath selectors to be handled. I go to a URL and it is a json response. In simpler terms, running page. You switched accounts on another tab or window. 0, since this is the latest version that is supported by alpine linux. evaluate() method? How can I dynamically inject functions to evaluate using Puppeteer? Feb 10, 2019 · This function lets you run any JS function in the page context. yourCustomFunction = => { // your logic here } Add a script tag to your page and calling the function within evaluate: I am trying to pass a function as an argument to page. If you post the predicted code i can suggest you a better way. waitForFunction() method. Using page. Puppeteer's page. If you want a "tricky" solution you cant try exposeFunction but usually is not a good way. 13. Selector. Related questions. Evaluates a function in the page's context and returns the result. Evaluation failed: ReferenceError: multiplePositionsPerJob is not defined. args. toString() on your function to get the source, which might contain references to helpers used by babel, which aren't present in the page context) Aug 27, 2020 · you're not passing in a function but the result of the function, which is a boolean. Alternatively, you can specify the selector type using a prefix. You signed out in another tab or window. 0; Platform / OS version: Windows 10; URLs (if applicable): Node. evaluate() An object is OK to pass but can't seem to pass a function. . launch evaluate() Evaluates a function in the page context. Which I believe is some sort of serialization and deserialization. launch() if you want to see it working with your own eyes. The workaround I found is to save the arguments to a file, pass the file path to the browser, and then fetch it. using arrow function into the return block of page. EvaluateFunctionAsync(@"async => { // await some promise }"); Dec 18, 2020 · I need to create a puppeteer script that will be able to send requests as well. evaluate of puppeter script. These two environments are isolated, each with its own rules for running code and exchanging data. Mar 9, 2025 · Evaluate Function: Within page. Sep 16, 2020 · how do I call a function passing the page object outside async method in puppeteer. However, it's not immediately clear how to pass variables from Node to the page. evaluate(function() { // this code has no access to foo console. Puppeteer: pass variable in . Although the function is defined in your script context, it actually gets converted to a string by Puppeteer, sent to the target page and evaluated there. trim() in page. However, passing variables into this function can be tricky. Apr 26, 2025 · Learn how to use Puppeteer's evaluate function to pass objects and execute scripts in the browser context. Since you're passing usedLicenses as an argument to evaluate(), you can access it inside the evaluate function directly by referencing it within the function's scope. Type. evaluate serialize a function and send it to the puppeeter browser. Sep 11, 2019 · The issue is that # is a special character in URLs. evaluate() method? How can I dynamically inject functions to evaluate using Puppeteer? Jul 24, 2020 · I am trying to use an XPath and an external variable in Puppeteer's evaluate function, but there is a problem: if I use the evaluate function with passing in the external variable then I can't pass in the XPath, if I remove the XPath everything is fine, but I need to do it with an XPath. 0. toString()). evaluate() 中传递变量; Puppeteer 评估函数; 允许将参数化函数作为字符串传递给 page. log as a trigger here is a strange choice. Ask Question Asked 6 years, 4 months ago. evaluate? Update for version 1. 如果传递给 page. exposeFunction), which expose your function as a global function (also available in as an attribute of your page window object), so you can call it when you are inside page. evaluate throws TypeError: cannot read innerText of null. a. querySelector(s) dom. evaluate in Puppeteer with Jest? 2. Using eval() or Function() constructor inside the evaluated function and transfer the function code as a string (difficult for code writing, linting etc. We can see that the parameters are a spreaded array (args) that is received in last. js environment, you can use the page. exposeFunction() produce unhandled promise rejections; How to pass a function in Puppeteers . evaluate 的函数返回 Promise，该函数将等待 Promise 解析并返回其值。 ¥If the function passed to page. evaluate and I don't understand why. (see the docs for more information). evaluate(() => startTheShow()) means there should be a startTheShow function in the page context which I'd assume there isn't any and the page context has no idea what startTheShow is. Here's the stripped down version of the code : let currentPost = 1; await page. To pass an argument to the function you provide to page. How to implement page. 15. page . evaluate() Functions. But you can define a function inside of the page. exposeFunction capabilities. evaluate resolves to undefined. If the function passed to the page. Func | string. Params. For some reason pkg doesn't correctly interpret the contents of the callback. evaluate() 10 Typescript extending third party class error: ElementHandle only refers to a type, but is being used as a value here Dec 10, 2024 · Variables in page. Jan 3, 2019 · I am not sure if this is an issue with Puppeteer but I looked around and could not find a proper answer to my question. from(document. I pass in an variable array that I would like to use to retrieve links from these sections in a drop down. js environment, which means it does not have access to variables from your Node. I want to pass the result of that function into page. XPath is so much more powerful than CSS selectors when it comes to query the DOM. puppeteer. The variable passed doesn't work. evaluate() function for use within the evaluated code. evaluate so I can use it in there. waitForFunction functions start failing wi Oct 14, 2020 · When the function finishes, it fills a div tag on that page. Bug expectation The documentation and certainly many Stack Overflow answers seem to imply that Page. innerHTML = "change to something" }, selector); In the above example I used s as the parameter, but passed in the value stored in selector. evaluate should accept the arguments which you are passing. Modified 2 years, How to pass array and function to Page. Viewed 9k times Pass a function to evaluate() in puppeteer. A call to any function is an expression that resolves to a value. – When trying to pass in a simple object into a async function that runs puppeteer, i get this error: (node:4000) UnhandledPromiseRejectionWarning: Error: Evaluation Jun 21, 2021 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. So I am asking it here. 0 Platform / OS version: Windo I can't figure out how to pass the logger object into page. evaluate(el => el. g. Passing Puppeteer page as params in a function is not working as expected. Explore Teams Nov 6, 2023 · In this code, we define the text variable with the desired text that you want to pass to the page. evaluate() returns a DOM element that is not serializable (it contains methods and circular references), it is replaced with an empty object. evaluate-1. whenever the child frame is attached or navigated. If the returned value is of a primitive type, it gets automatically converted by Puppeteer to a primitive type in the script context like in the previous example. Parameter. toString ( ) + ')();' ) ; const selector = '#someSelector'; // 2. Below is the syntax for using the evaluate function: Sep 8, 2019 · Following the puppeteer's documentation, you can see where we can insert parameters. multiplePositionsPerJob is a function that I've referenced with require in the file. Commented You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript): Example 2 const aHandle = await page . Nov 20, 2020 · You're passing a function into the . In this case, the function is invoked in the context of the newly attached frame. width, canvas. evaluate? 2. evaluate returns a Promise, the function will wait for the promise to resolve and return its value. evaluate puppeteer pass function inside puppeteer evaluate puppeteer evaluate pass function evaluate puppeteer pass variables puppeteer evaluate pass global variable puppeteer evaluate pass element handle how to pass value Feb 16, 2018 · How to use imported function inside page. This makes it hard make the scraping code generic. Nov 5, 2017 · I am trying to evaluate a function with puppeteer but the callback is never firing (i am certain the host page is working as expected). Be aware, that functions defined there will only be present in the browser environment and not inside your Node. evaluate returns a [Promise], then page. evaluate(), but you can call another special method (page. May 18, 2021 · I'm using Puppeteer. evaluate and page. evaluate((selector) => { // 3. 签名 ¥Signature You can pass a string instead of a function (although functions are recommended as they are easier to debug and use with TypeScript): Example 2 const aHandle = await page . Reload to refresh your session. Pass it here }, selector); What's going on?. Put what puppeteer needs in puppeteer and what the main program needs in that scope. Waits for the provided function, pageFunction, to return a truthy value when evaluated in the page's context. title ); This returns the document title from the puppeteer instance back to the node process. trim() would be provided in another function efn as x=> x. I need this variable to be used inside the browser's context. So when you are using page. Aug 20, 2019 · Puppeteer page. As document. js script. : await page. Puppeteer - failed to pass variable Apr 6, 2020 · I had the same issue, Puppeteer was crashing a free-tier EC2 instance when I tried to pass ~20MB of data to evaluate(). Did you mean page. evaluate accepts two arguments,pageFunction, and the rest are serialized args. exposeFunction() 绑定的函数会产生未处理的承诺拒绝; 暴露的函数 queryseldtcor 在 puppeteer 中不起作用; 如何动态注入函数以使用 Puppeteer 进行评估？ Oct 28, 2018 · I'm working with Node. You cannot pass a function directly into page. pageFunction. type() in Nov 26, 2017 · Saved searches Use saved searches to filter your results more quickly Apr 8, 2020 · So, I have a function that returning page that needed by next function:. The evaluate() method The page. This page is a list of Puppet's built-in functions, with descriptions of what they do and how to use them. evaluate() is isolated from the Node. evaluate() 9. evaluateHandle returns a Promise, the function will wait for the promise to resolve and return its value. The most common one is. evaluate to extract any information necessary: Jan 30, 2018 · You can solve this problem by passing variables to the evaluate function. js (Puppeteer) Environment; Page DOM Environment; You should use page. If the given function returns a promise, evaluate will wait for the promise to resolve. An array of elements matching the given selector will be passed to the function as its first argument. Undefined Variables The method adds a function called name on the page's window object. Aug 19, 2022 · Puppeteer page. evaluate() method? Why can't I access 'window' in an exposeFunction() function with Oct 9, 2017 · Is it possible to pass a function to Puppeteer's page. textContent. I do not understand why this is happening. 0. In these cases, you may prefer the evaluate approach, or only partially converting the browser code to Puppeteer code on an as-needed basis for specific trusted events. – Jan 30, 2018 · I login to a site and it gives a browser cookie. 1. Functions are plugins you can call during catalog compilation. log. evaluate method. 53. x and above - Jan 2020. How would I go about this function? Sep 9, 2017 · To parse any data from a page you would rather wait for it to load completely and then use page. the function to be evaluated in the page context. Feb 27, 2021 · I found something like that works for variable, but now i need to pass a function also. evaluate() function. evaluate method to run JavaScript code in the context of the page? Jun 29, 2018 · In Puppeteer you can evaluate async functions: await page. Which is why I was thinking to have them defined in both places. selector to query the page for. evaluate; 与 page. log() calls: Apr 25, 2020 · TypeError: page. It states: pageFunction <function|string> Function to be evaluated in the page context We would like to show you a description here but the site won’t allow us. For example: const selector = '#id' await page. Remarks . evaluate to the outer scope. Aug 16, 2019 · If you're using a transpiler like babel you might need to pass the function as a string to page. 3. Try Teams for free Explore Teams Nov 29, 2023 · Also, note that the function you pass to page. As a rule of thumb, if the return value of the given function is more complicated than a JSON object (e. Aug 25, 2021 · I am new to puppeteersharp and puppeteer in general. Works quite fast compared to what Puppeteer does. evaluate, i would like the function stated in the OP do the querySelect call inside the browser, while . Quote from the docs: Sep 3, 2019 · His await function serpDesc would need to be contained in an async function. When called, the function executes puppeteerFunction in node. log(foo); }); } Mar 6, 2024 · How to use Puppeteer’s page. evaluate() this should work as well. Jan 24, 2020 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. ReferenceError: alljobs is not defined. I am also running with --no-sandbox Just for the sake of code Mar 16, 2021 · page. Mar 4, 2019 · You can pass an object with options to puppeteer. use it here document. value = keyword; }, keyword); And this code can click on the Google Search button and wait for the page to load. Page. If you use console. 5. log() text from the browser context back to node, use the following code and make sure to set the listener before any console. evaluate() is akin to opening Dev tools and writing set_calendar_date('1') there directly. 0 Puppeteer - failed to pass variable into an evaluate function. evaluate() function, you can access this text using the text parameter. evaluate querySelectorAll return empty objects You can just pass a string as the function body or a traditional function. evaluate(pageFunction[,args]). Modified 5 years ago. read the passed data const lastUpdate = await page. launch(). How to pass array and function to Page Mar 15, 2019 · I am trying to pass my custom object to page. element") const element2=await page. On the other hand, the page. Signature ¥If the function passed to page. querySelector(selector). evaluate not running console. Jan 1, 1970 · NOTE: This page was generated from the Puppet source code on 2022-02-07 10:05:45 -0800. js and Puppeteer for the first time and can't find a way to output values from page. selector. if you look at the example I showed of casperjs, you can see there is this line where you are basically executing a function on the browser scope. As a result, it doesn’t have access to variables defined in the parent scope. Conclusion Executing JavaScript within the page context while automating with Puppeteer is straightforward with the page. If you want to pass a parameter to a function via the query string of the URL, it should be URL escaped with percent encoding. and. plyxbokppjbjrlkflcbnjsacuxhpcrcbbbtmlotgnqcvjbnigyrdru