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page.screenshot() screenshot leta hai, lekin yeh khud nahin jaan sakta ki aapki website ka dynamic content kab taiyar hua. Sabse bharosemand tareeqa hai page ke actual ready state—jaise visible results container ya loading indicator ka hatna—ka wait karna, phir screenshot lena. Network idle tabhi chunein jab aapke page par network traffic ka shaant hona taiyari ka sahi signal ho.
Screenshot se pehle kis cheez ka wait karein?
page.goto() ka waitUntil: 'load' navigation lifecycle ke ek point ka intezar karta hai. Uske baad bhi client-side JavaScript data la sakti hai, components render kar sakti hai ya page ko update kar sakti hai. Isliye “page load ho gaya” aur “capture karne layak content taiyar hai” zaroori nahin ki ek hi baat hon.
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Target page par jo cheez aapko capture karni hai uska observable signal chunein: ready results element ka dikhna, loading message ka hatna, ya cards ki ginti expected minimum tak pahunchna. Puppeteer screenshot lene ke liye page.screenshot() deta hai; readiness condition aapko alag se batani hoti hai. Puppeteer ki screenshot guide mein navigation ke saath networkidle2 ka example bhi hai, lekin yeh har application ke liye app-level readiness ka badal nahin.
Kaunsa wait method chunna chahiye?
| Method | Kab use karein | Kya wait karta hai | Dhyan rahe |
|---|---|---|---|
waitForSelector(selector, {visible: true}) |
Jab content aane par koi bharosemand element dikhai deta ho. | Selector ka DOM mein hona aur visible hona. | Agar selector jaldi dikh jata hai, to yeh baaki content ke liye taiyari ka galat signal ho sakta hai. Documented default timeout 30,000 ms hai; ise badla ja sakta hai. API reference. |
waitForFunction() |
Jab readiness ek se zyada DOM conditions par nirbhar ho. | Aapke function ka page context mein truthy return hona. | Condition ko sachmuch us state ko dikhana chahiye jise aap capture karna chahte hain. API reference. |
waitForNetworkIdle() |
Jab is page ke liye network traffic ka rukna kaafi readiness signal ho. | Network idle state; documented default idleTime 500 ms aur concurrency 0 hai. |
Shaant network yeh sabit nahin karta ki zaroori UI state sahi hai. API reference. |
| Locator wait | Jab element dhoondhna ya usse interact karna ho. | Locator ki presence aur interaction ki preconditions. | Locator wait apne aap screenshot content ke liye universal ready signal nahin hai. Page interactions guide. |
Selector dikhne par wait karke screenshot lein
Yeh pattern tab istemal karein jab .results-ready us content ke taiyar hone ka bharosemand marker ho jise aap capture karna chahte hain:
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const url = 'https://example.com/results';
await page.goto(url, { waitUntil: 'domcontentloaded' });
await page.waitForSelector('.results-ready', {
visible: true,
timeout: 15_000,
});
await page.screenshot({ path: 'results.png', fullPage: true });example.com aur .results-ready ko apne target URL aur page ke sahi selector se badlein. Agar marker sirf shell ya placeholder ke render hote hi aa jata hai, to iske bajay final results ko represent karne wala selector chunein. Selector na milne par wait timeout ke saath fail hoga; default timeout 30 seconds hai agar aap timeout set na karein.
Jab readiness mein kai DOM conditions hon
waitForFunction() ka istemal karke loading state aur content dono check karein. Misal mein screenshot tab tak nahin liya jayega jab tak loading element hat na jaye aur kam se kam teen result cards na hon:
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await page.goto(url, { waitUntil: 'domcontentloaded' });
await page.waitForFunction(() => {
const loading = document.querySelector('.loading');
const cards = document.querySelectorAll('.result-card');
return !loading && cards.length >= 3;
}, { timeout: 15_000 });
await page.screenshot({ path: 'results.png' });.loading, .result-card aur 3 ko apne page ke actual loading behavior, selectors aur expected count ke mutabik set karein. Yeh generic template hai, kisi khaas website par test ka daawa nahin.
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Agar page ki zaroori activity network requests ke settle hone ke baad poori hoti hai aur background requests idle state ko lagatar rok nahin rahi hain, to yeh option kaam aa sakta hai:
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await page.goto(url, { waitUntil: 'domcontentloaded' });
await page.waitForNetworkIdle({ idleTime: 500 });
await page.screenshot({ path: 'page.png' });Puppeteer API reference mein idleTime ka default 500 ms aur concurrency ka default 0 hai. Apne capture ke liye idle threshold ya concurrent requests ki shart badalni ho to options reference dekhein. Agar page polling, analytics ya doosri background requests karta hai, ya UI request khatam hone ke baad render hota hai, to network idle galat ya der se signal de sakta hai; aise mein app-specific selector ya function condition zyada seedha signal hai.
Timeout aur galat screenshot ki troubleshooting
- Selector timeout ho raha hai: DevTools mein selector ko target page par verify karein, aur jaanchein ki element iframe ke andar to nahin. Agar woh iframe mein hai, to us frame par wait karein; page ke main document ka selector usse nahin milega.
- Screenshot placeholder ya adhura content dikhata hai: Ready marker shayad bahut jaldi aa raha hai. Loading indicator ke hatne, expected cards ki ginti, ya final content ke kisi aur app-specific signal ko condition mein jodein.
waitForNetworkIdle()bahut der leta hai: Background polling ya lagatar requests idle state ko rok sakti hain. Network-idle wait hata kar actual UI state par selector/function wait lagayein.- Wait safal hai par screenshot phir bhi khaali hai: Condition ko dobara dekhein—khaali container bhi selector match kar sakta hai. Aisi condition chunein jo visible, meaningful content ko verify kare, phir capture ko dobara chalayein.
- Timeout badhana hai: Sirf tab badhayein jab content ko aane mein waqai zyada samay lag sakta ho. Badhaya hua timeout galat selector ya galat readiness signal ko theek nahin karta.
Delay ke bajay condition-based wait kyun?
page.waitForTimeout() jaisa fixed delay har run mein ek hi samay rukta hai, chahe content pehle aa gaya ho ya abhi bhi load ho raha ho. Condition-based wait content taiyar hote hi aage badhta hai aur condition poori na hone par timeout ko saaf failure banata hai. Agar aapke page ke liye fixed delay hi ekmatra upalabdh signal hai, to use jaan-boojhkar chun sakte hain; use readiness ka pramaan na samjhein.
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Frequently Asked Questions
Kya waitUntil: 'load' dynamic content ke liye kaafi hai?
Aksar nahin. Yeh navigation lifecycle ka ek stage hai; client-side app uske baad bhi content update kar sakti hai.
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Selector wait ka default timeout kitna hai?
Puppeteer ke waitForSelector() ka documented default 30,000 ms hai. Zaroorat par timeout option se ise badal sakte hain.
Quick Recap
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