我怎么能从使用PoPPETER的谷歌地图地方得到所有的评论/评论?(我没有全部得到,因为页面是可滚动的)

我正试图从我用木偶师搜索的地方收集评论。我有两个问题:

1. 我只从当前页面得到16条评论/评论,而实际上我想要所有的评论/评论(在本例中是62条评论,甚至更多,这取决于我的搜索),但我认为问题来自页面的可滚动性。

2. 当我抓取谷歌地图上没有评论的评论时,我得到了一个错误:

   "(node:13184) UnhandledPromiseRejectionWarning: Error: Evaluation failed: TypeError: Cannot read property 'innerText' of null
   at __puppeteer_evaluation_script__:9:38"
   

   ,并且我不确定如何在每次出现带有空注释的评论时消除这种情况(我有一些代码几乎在最后试图解决空注释,但不起作用,我尝试了其他一些也不起作用的方法)。

以下是我的代码:

const puppeteer = require('puppeteer'); // Require the Package we need...

let scrape = async () => { // Prepare scrape...

    const browser = await puppeteer.launch({args: ['--no-sandbox', '--disabled-setuid-sandbox']}); // Prevent non-needed issues for *NIX
    const page = await browser.newPage(); // Create request for the new page to obtain...

    const busqueda = 'Alitas+del+Cadillac+Tumbaco';
    const Url = `https://www.google.com/maps/search/${busqueda}`;

    const buscar = '.section-result';
    const click1 = '.widget-pane-link';
    const cajaTexto = '#searchboxinput';

    const comentarioLength = 'section-review-text';
    const comentarios = 'div.section-review:nth-child(Index) > div:nth-child(1) > div:nth-child(3) > div:nth-child(2) > div:nth-child(1) > span:nth-child(4)';

    console.log(comentarioLength);

    //const comentario = 'div.section-review:nth-child(INDEX) > div:nth-child(1) > div:nth-child(3) > div:nth-child(2) > div:nth-child(1) > span:nth-child(4)';

    // Replace with your Google Maps URL... Or Test the Microsoft one...
    //await page.goto('https://www.google.com/maps/place/Microsoft/@36.1275216,-115.1728651,17z/data=!3m1!5s0x80c8c416a26be787:0x4392ab27a0ae83e0!4m7!3m6!1s0x80c8c4141f4642c5:0x764c3f951cfc6355!8m2!3d36.1275216!4d-115.1706764!9m1!1b1');

    await page.goto(Url); // Define the Maps URL to Scrape...
    await page.waitFor(2*1000); // In case Server has JS needed to be loaded...

    await page.click(buscar); //busco caja de texto*/

    await page.waitForNavigation();
    await page.waitFor(2*1000);

    await page.click(click1);

    await page.waitForNavigation();
    await page.waitFor(2*1000);

    console.log(page.url());

    console.log("3");

    await page.evaluate(_ => { // This is just a test, don't really need this!

    });

    await page.waitFor(2*1000);

    console.log('how many?', (await page.$$('.section-review-text')).length);

    //div.section-result:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(2) > h3:nth-child(1) > span:nth-child(1)

    let listLength = await page.evaluate((sel) => {
        window.scrollBy(0, window.innerHeight);
        return document.getElementsByClassName(sel).length;
    }, comentarioLength);

    console.log(listLength);

    for (let i = 1; i <= listLength; i++) {

        let selectorComentarios = comentarios.replace("Index", i);

        const result = await page.evaluate((sel) => { // Let's create variables and store values...

            return document.querySelector(sel).innerText;

        }, selectorComentarios);

        if(!result){
            continue;
        }

        console.log(i+result);

    }

    /*await page.evaluate(_ => {
        window.scrollBy(0, window.innerHeight)
    })*/

    browser.close(); // Close the Browser...
    return result; // Return the results with the Review...
};

scrape().then((value) => { // Scrape and output the results...


console.log(value); // Yay, output the Results...
});