Selenium – How to handle WAIT

最新推荐文章于 2025-04-16 18:43:30 发布

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本文详细介绍了在使用Selenium进行自动化测试时遇到元素查找超时问题时，如何采用Sleep、WebDriverWait、AjaxWait和自定义等待方法等策略来解决这一常见难题，确保测试流程的稳定性和高效性。

if selenium script run faster than code which we want to test, it could happen that can’t find element. there are some ways to handle this problem depends on different cases

Sleep

This is the easiest but inefficient way. It mean wait fixed time , then try again. Usually we don’t use this way since it depends on the load time and it is not efficient.

public static void Wait(int miniseconds)
        {
            Thread.Sleep(miniseconds);
        }

WebDriverWait

This Method can resolve most of cases if there is no ajax load. Code wait until one element is present.

private static void WaitElement(By by, double seconds)
        {
            try
            {
               var wait = new WebDriverWait(Driver, TimeSpan.FromSeconds(seconds))
                {
                    Message = @by.ToString() + " is not exist"
                };
                wait.Until((d) => d.FindElement(@by));
            }
            catch(Exception e)
            {
                GetScreenShot(e);
            }
        }

AjaxWait

Below method is generally assert that if ajax call finished.

        public static void WaitForAjaxCallFinish()
        {
            WaitForConditions("return window.jQuery.active == 0");
        }
        
        public static void WaitForConditions(string script)
        {
            var wait = new DefaultWait<bool>(((bool)((IJavaScriptExecutor)Driver).ExecuteScript(script) == true))
            {
                Timeout = TimeSpan.FromSeconds(_stepTimeout)
            };
        }

But no jquery connection doesn’t mean expected element is present. so the below method is the way to finnaly resolve wait problem.

// try to find element every 5 seconds, until element is exist or it's time out.
        public static IWebElement GetElementUntilPresent(By by)
        {
            for (int i = 0; i < _stepTimeout; i = i + 5)
            {
                try
                {
                   return Driver.FindElement(by);
                }
                catch (Exception e)
                {
                        Wait(5000);
                }
            }
            return null;
        }

Sometimes we get test case fail with below message

The HTTP request to the remote WebDriver server for URL http://localhost:13915/session/01ab4ef8075bba3d64e8fc3062aa79b5/element timed out after 60 seconds.

I try : 1. set page time out

private static void OpenBrowser(string pageTitle)
{
Driver.Manage().Timeouts().SetPageLoadTimeout(TimeSpan.FromMinutes(_pagetimeout));
Driver.Manage().Timeouts().SetScriptTimeout(TimeSpan.FromMinutes(_pagetimeout));
Driver.Navigate().GoToUrl(WebsiteUrl);
}