Question

嗨，我是angular和type脚本的新手。我需要检查表是否为空，并根据需要隐藏或显示div。我尝试过，

var rows = document.getElementById('associatedEmailsTable'))rows;和
var rows =(<HTMLInputElement>document.getElementById('associatedEmailsTable')).rows;

但是两者给出的结果相同，请帮助我。

请建议我如何使用JavaScript查找表tr是否具有任何值。

我的HTML代码是

   <table class="table table-sm table-hover" id="associatedEmailsTable" style="display:none">
       <tr>
            <th>
              Email
            </th>
            <th>
              Action
            </th>
          </tr>
          <tr *ngFor="let oEmailAddress of this.associatedEmailAddresses">
            <td>{{oEmailAddress.email}}</td>

          </tr>
        </table>

Answer 1

问题恰恰是错误所说的，“ HTMLInputElemet类型不存在属性行”。

假设您拥有page.evaluate，那么您拥有的是page.$eval。所以：

const puppeteer  = require ('puppeteer');
(async () => {
    const browser = await puppeteer.launch({ headless : false });
    const page = await browser.newPage();
    await page.goto('https://www.handelsregister.de/rp_web/mask.do?Typ=e');

    await Promise.all([
        page.click('input#landNW'), // set a filter
        page.click('input[type=submit]'), // submit the form
        page.waitForNavigation(), // wait for the page to load
    ]).catch(e => console.log(e));

    // Print the number of allowed results (must be 200)
    console.log(await page.$eval('#inhalt p', el => el.textContent.match(/\d+ hits/)[0]));

    await Promise.all([
         // Manual clicking of the link
         page.$eval('p a', el => el.click()),
         page.waitForNavigation()
    ]).catch(e => console.log(e));

    // Print the number of allowed results (must be 400 now)
    console.log(await page.$eval('#inhalt p', el => el.textContent.match(/\d+ hits/)[0]));

    await browser.close();
})();

（TS）属性行在类型HTMLInputElemet上不存在

1 个答案: