如何等待直到下拉选择的选项使用硒更改?

问题描述：

有时，基于页面上的其他操作，下拉菜单中选择的项目会自动更改，而无需重新加载页面(此下拉菜单每次都具有相同数量的选项). 我们如何才能等到使用Selenium Webdriver C#下拉选择的项目进行更改?

Sometimes, based on some other actions on page, a dropdown selected item changes automatically without page reload (this dropdown has same no. of options everytime). How can we wait until dropdown selected item changes using selenium webdriver C#?

<select name="ddlFruit_N" id="ddlFruit_N" class="Searchddl" style="text-decoration: none; width: 152px; height: 22px;">
    <option value="">Select</option>
    <option value="447">Grapes</option>
    <option value="448">Mango</option>
    <option selected="selected" value="449">Apple</option>
</select>

答

请尝试下面的代码来等待下拉选项的更改.

Please try below code to wait for changed dropdown option.

public static SelectElement FindSelectElementWhenPopulated(IWebDriver driver, By by, int delayInSeconds, string optionText)
    {
        WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(delayInSeconds));
        return wait.Until<SelectElement>(drv => 
        {
            SelectElement element = new SelectElement(drv.FindElement(by));
            if (element.SelectedOption.ToString().Contains(optionText))
            {
                return element;
            }

            return null;
        }
        );
    }

我这样称呼它，以等待更改的下拉选项橙色"

and I call it like this to wait for changed drop down option "Orange"

Myclass.FindSelectElementWhenPopulated(driver, By.CssSelector("#ddlFruit_N"), 20, "Orange");

如何等待直到下拉选择的选项使用硒更改?

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