多个选择器上的 Puppeteer waitForSelector [英] Puppeteer waitForSelector on multiple selectors

问题描述

我让 Puppeteer 使用查找表单控制网站，该表单可以返回结果或未找到记录"消息.我怎么知道哪个被退回了?waitForSelector 似乎一次只等待一个，而 waitForNavigation 似乎不起作用，因为它是使用 Ajax 返回的.我正在使用 try catch，但很难做到正确并且会减慢一切.

I have Puppeteer controlling a website with a lookup form that can either return a result or a "No records found" message. How can I tell which was returned? waitForSelector seems to wait for only one at a time, while waitForNavigation doesn't seem to work because it is returned using Ajax. I am using a try catch, but it is tricky to get right and slows everything way down.

try {
    await page.waitForSelector(SELECTOR1,{timeout:1000}); 
}
catch(err) { 
    await page.waitForSelector(SELECTOR2);
}

推荐答案

使用 Md. Abu Taher 的建议，我得到了这个:

Using Md. Abu Taher's suggestion, I ended up with this:

// One of these SELECTORs should appear, we don't know which
await page.waitForFunction((sel) => { 
    return document.querySelectorAll(sel).length;
},{timeout:10000},SELECTOR1 + ", " + SELECTOR2); 

// Now see which one appeared:
try {
    await page.waitForSelector(SELECTOR1,{timeout:10});
}
catch(err) {
    //check for "not found" 
    let ErrMsg = await page.evaluate((sel) => {
        let element = document.querySelector(sel);
        return element? element.innerHTML: null;
    },SELECTOR2);
    if(ErrMsg){
        //SELECTOR2 found
    }else{
        //Neither found, try adjusting timeouts until you never get this...
    }
};
//SELECTOR1 found

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