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efficient-indigoE
Apify & Crawlee•4y ago•
3 replies
efficient-indigo

How can I add dynamically JS string function into `preNavigationHooks`?

I would like to dynamically add a string (which describes a JS function) to
preNavigationHooks
preNavigationHooks
array in CheerioCrawlerOptions [1]

const crawlerOptions = {
...  preNavigationHooks: [],
});
const jsFunction = "async ({ page, request }) => { log.info(`preNavigationHook ${request.url}`); }";
crawlerOptions.preNavigationHooks.push( ??? WHAT ???) 
const myCrawler = new CheerioCrawler(crawlerOptions);
const crawlerOptions = {
...  preNavigationHooks: [],
});
const jsFunction = "async ({ page, request }) => { log.info(`preNavigationHook ${request.url}`); }";
crawlerOptions.preNavigationHooks.push( ??? WHAT ???) 
const myCrawler = new CheerioCrawler(crawlerOptions);


If I do
crawlerOptions.preNavigationHooks.push(jsFunction);
crawlerOptions.preNavigationHooks.push(jsFunction);
, when I run crawler, I got error:
WARN CheerioCrawler: Reclaiming failed request back to the list or queue. TypeError: hook is not a function
at CheerioCrawler._executeHooks (D:\Developpement\NodeJS\Nowis_Scraper\node_modules@crawlee\basic\internals\basic-crawler.js:834:23)
at CheerioCrawler._handleNavigation (D:\Developpement\NodeJS\Nowis_Scraper\node_modules@crawlee\http\internals\http-crawler.js:326:20)
at CheerioCrawler._runRequestHandler (D:\Developpement\NodeJS\Nowis_Scraper\node_modules@crawlee\http\internals\http-crawler.js:286:24)

[1] https://crawlee.dev/api/cheerio-crawler/interface/CheerioCrawlerOptions#preNavigationHooks
CheerioCrawlerOptions | API | Crawlee
CheerioCrawlerOptions | API | Crawlee
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**Update to Store Publishing Terms and Acceptable Use Policy** Due to an influx of fraudulent reviews recently, Apify's Legal team has taken some actions to protect developers, customers, and Apify, by updating the Store Publishing Terms and Acceptable Use Policy. Please pay special attention to the updated terms in section 4 of the Store Publishing Terms here: https://docs.apify.com/legal/store-publishing-terms-and-conditions Additionally, please review the changes to section 2 of the Acceptable Use Policy here: https://docs.apify.com/legal/acceptable-use-policy If you have any questions, please ask them in <#1206131794261315594> so everyone can see the discussion. Thanks!

ellativity · 3w ago

ellativity

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ellativity · 4w ago

ellativity

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