java - 显式等待 X 元素可见

Question

我想等待一定数量的元素在页面上可见。

为此，我使用:

wait = new WebDriverWait(driver, timeout.getValueInSec());  
wait.until(ExpectedConditions.visibilityOfAllElementsLocatedBy(locator));

虽然超时时间足够长，但此方法返回的元素比我看到和预期的要少(在本具体示例中为 6 个中的 2 个)。它可能会在找到 2 个元素后立即返回，然后其他元素才出现。

有没有办法告诉 Selenium 驱动程序等待 X 元素？ 像这样的东西:

wait.until(ExpectedConditions.visibilityOfNElementsLocatedBy(6, locator));

Answer 1

定制并不难 Expected Condition 满足您的具体要求:

public static ExpectedCondition<List<WebElement>> visibilityOfNElementsLocatedBy(
      final By locator, final int elementsCount) {
    return new ExpectedCondition<List<WebElement>>() {
      @Override
      public List<WebElement> apply(WebDriver driver) {
        List<WebElement> elements = findElements(locator, driver);

        // KEY is here - we are "failing" the expected condition 
        // if there are less than elementsCount elements
        if (elements.size() < elementsCount) {
          return null;
        }

        for(WebElement element : elements){
          if(!element.isDisplayed()){
            return null;
          }
        }
        return elements;
      }

      @Override
      public String toString() {
        return "visibility of N elements located by " + locator;
      }
    };
  }

用法:

wait.until(visibilityOfNElementsLocatedBy(locator, 6));