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Puppeteer with Prompt, ignoring rest of function


Puppeteer with Prompt, ignoring rest of function

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Puppeteer with Prompt, ignoring rest of function
Tag : javascript , By : BooTeK
Date : November 24 2020, 03:01 PM

I wish this helpful for you You have to resolve the promise. I re-wrote the code a little bit to show the concept in practice.
const puppeteer = require('puppeteer');
const prompt = require('prompt');

var schema = {
    properties: {
        url: {
            hidden: false
        }
    }
};

prompt.start();

(async() => {
    var result = await new Promise(function (resolve, reject) {
        prompt.get(schema, function (err, result) {
            resolve(result);
        });
    });
    const browser = await puppeteer.launch({
        headless: true
    });

    const page = await browser.newPage();
    await page.goto(result.url);
    const title = await page.title();

    console.log(`${result.url} has title: ${title}`);

    await page.close();
    await browser.close();
    /* truncated */
})();
▶ node prompt.js
prompt: url:  http://example.com
http://example.com has title: Example Domain

▶ node prompt.js
prompt: url:  http://google.com
http://google.com has title: Google

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efficient way to divide ignoring rest


Tag : cpp , By : yew tree
Date : March 29 2020, 07:55 AM
wish helps you there are 2 ways i found to get a whole number from a division in c++ , If you're dealing with integers, then the usual way is
Quotient = value1 / value2;

How to download PDF file using PUPPETEER after form submit? NodeJS | PUPPETEER


Tag : node.js , By : Sergio Rudenko
Date : March 29 2020, 07:55 AM
wish helps you I do not know exactly how the pdf is downloaded but I think you can use the following.
await page._client.send('Page.setDownloadBehavior', {behavior: 'allow', downloadPath: '/home/me/stuff'});

What's the performance difference of puppeteer.launch() versus puppeteer.connect()?


Tag : docker , By : Ivan Belov
Date : March 29 2020, 07:55 AM
seems to work fine Short Answer:
Using puppeteer.connect() / browser.disconnect() whenever possible is best from a performance standpoint and is ≈ 146 times faster than using puppeteer.launch() / browser.close() (according to my benchmark tests).
'use strict';

const puppeteer = require('puppeteer');
const { performance } = require('perf_hooks');

const iterations = 10000;

(async () => {
  let browser;

  const start_time = performance.now();

  for (let i = 0; i < iterations; i++) {
      browser = await puppeteer.launch();

      await browser.close();
  }

  const end_time = performance.now();

  const total_time = end_time - start_time;
  const average_time = total_time / iterations;

  process.stdout.write (
      'Total Time:\t' + total_time + ' ms\n'
    + 'Average Time:\t' + average_time + ' ms\n'
    + 'Iterations:\t' + iterations.toLocaleString() + '\n'
  );
})();
'use strict';

const puppeteer = require('puppeteer');
const { performance } = require('perf_hooks');

const iterations = 10000;

(async () => {
  let browser = await puppeteer.launch();
  const browserWSEndpoint = browser.wsEndpoint();

  browser.disconnect();

  const start_time = performance.now();

  for (let i = 0; i < iterations; i++) {
    browser = await puppeteer.connect({
      browserWSEndpoint,
    });

    browser.disconnect();
  }

  const end_time = performance.now();

  const total_time = end_time - start_time;
  const average_time = total_time / iterations;

  process.stdout.write (
      'Total Time:\t' + total_time + ' ms\n'
    + 'Average Time:\t' + average_time + ' ms\n'
    + 'Iterations:\t' + iterations.toLocaleString() + '\n'
  );

  process.exit();
})();

Can you input into the text field of a prompt box using Puppeteer?


Tag : javascript , By : Mikael
Date : March 29 2020, 07:55 AM
With these it helps You have to use the dialog event. Once there, you can use dialog.accept to set the text. This will input "Stack Overflow" in your example:
const browser = await puppeteer.launch({headless: false});
const page = await browser.newPage();
await page.goto("https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_prompt");
const frame = (await page.frames())[1];

page.on('dialog', dialog => {
    dialog.accept("Stack Overflow!");
});

await frame.click("BUTTON")

browser.close();

Calling puppeteer from rest api


Tag : rest , By : ziqew
Date : March 29 2020, 07:55 AM
seems to work fine Yes, it is possible to do that. I recommend to use a pool of puppeteer instances to limit the number of parallel executions. As you already noticed, otherwise you might have 10 open browsers in the case of 10 requests coming in at roughly the same time.
Check out the library puppeteer-cluster (disclaimer: I'm the author), which supports your use case.
const express = require('express');
const app = express();
const { Cluster } = require('puppeteer-cluster');

(async () => {
    const cluster = await Cluster.launch({
        concurrency: Cluster.CONCURRENCY_BROWSER,
        maxConcurrency: 4,
    });

    // setup the function to be executed for each request
    await cluster.task(async ({ page, data: url }) => {
        await page.goto('http://' + url);
        // ...
        return await page.content();
    });

    // setup server
    app.get('/', async function (req, res) { // expects URL to be given by ?url=...
        try {
            // run the task function for the URL
            const resp = await cluster.execute(req.query.url);
            // respond with the result
            res.status(200).send(resp);
        } catch (err) {
            // catch error
            res.end('Error: ' + err.message);
        }
    });

    app.listen(3000, function () {
        console.log('Server listening on port 3000.');
    });
})();
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