blocks|key|1249471|text|我会用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249472|waitForElementPresent(locator)|code-block|syntax|javascript|1249473|这将一直等到元素出现在DOM中。|1249474|如果需要检查元素是否可见，最好使用|1249475|waitForElementHeight(locator)|1249476|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I would use

<pre><code>waitForElementPresent(locator)
</code></pre>

This will wait until the element is present in the DOM.

If you need to check the element is visible, you may be better using

<pre><code>waitForElementHeight(locator)
</code></pre>

blocks|key|1034406|text|与等待元素相比，更一般的解决方案是等待与服务器的所有连接关闭。这将允许您等待所有ajax调用完成，即使它们没有任何回调，因此不会影响页面。更多细节可以在here上找到。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1034407|使用C#和jQuery，我创建了以下方法来等待所有AJax调用完成(如果有人有更直接的方法从C#访问JS变量，请评论)：|1034408|internal+void+WaitForAjax(int+timeOut+=+15)
{
++++var+value+=+"";
++++RepeatUntil(
++++++++()+=>+value+=+GetJavascriptValue("jQuery.active"),+
++++++++()+=>+value+==+"0",+
++++++++"Ajax+calls+did+not+complete+before+timeout"
++++);
}

internal+void+RepeatUntil(Action+repeat,+Func<bool>+until,+string+errorMessage,+int+timeout+=+15)
{
++++var+end+=+DateTime.Now+%2B+TimeSpan.FromSeconds(timeout);
++++var+complete+=+false;

++++while+(DateTime.Now+<+end)
++++{
++++++++repeat();
++++++++try
++++++++{
++++++++++++if+(until())
++++++++++++{
++++++++++++++++complete+=+true;
++++++++++++++++break;
++++++++++++}
++++++++}
++++++++catch+(Exception)
++++++++{+}
++++++++Thread.Sleep(500);
++++}
++++if+(!complete)
++++++++throw+new+TimeoutException(errorMessage);
}

internal+string+GetJavascriptValue(string+variableName)
{
++++var+id+=+Guid.NewGuid().ToString();
++++_selenium.RunScript(String.Format(@"window.$('body').append(""<input+type='text'+value='""%2B{0}%2B""'+id='{1}'/>"");",+variableName,+id));
++++return+_selenium.GetValue(id);
}|code-block|syntax|javascript|1034409|entityMap|0|LINK|mutability|MUTABLE|url|http://agilesoftwaretesting.com/?p=111^0|24|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

A more general solution than waiting for an element would be to wait for all the connections to the server to close. This will allow you to wait for all ajax calls to finish, even if they don't have any callback and thus don't affect the page. More details can be found <a href="http://agilesoftwaretesting.com/?p=111">here</a>.

Using C# and jQuery, I have created the following method to wait for all AJax calls to complete (if anyone have more direct ways of accessing JS variables from C#, please comment):

<pre><code>internal void WaitForAjax(int timeOut = 15)
{
 var value = "";
 RepeatUntil(
 () =&gt; value = GetJavascriptValue("jQuery.active"), 
 () =&gt; value == "0", 
 "Ajax calls did not complete before timeout"
 );
}

internal void RepeatUntil(Action repeat, Func&lt;bool&gt; until, string errorMessage, int timeout = 15)
{
 var end = DateTime.Now + TimeSpan.FromSeconds(timeout);
 var complete = false;

 while (DateTime.Now &lt; end)
 {
 repeat();
 try
 {
 if (until())
 {
 complete = true;
 break;
 }
 }
 catch (Exception)
 { }
 Thread.Sleep(500);
 }
 if (!complete)
 throw new TimeoutException(errorMessage);
}

internal string GetJavascriptValue(string variableName)
{
 var id = Guid.NewGuid().ToString();
 _selenium.RunScript(String.Format(@"window.$('body').append(""&lt;input type='text' value='""+{0}+""' id='{1}'/&gt;"");", variableName, id));
 return _selenium.GetValue(id);
}
</code></pre>

blocks|key|1249588|text|对于那些使用primefaces的用户，只需执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249589|selenium.waitForCondition("selenium.browserbot.getCurrentWindow().$.active==0",+defaultWaitingPeriod);|code-block|syntax|javascript|1249590|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For those who is using primefaces, just do:

<pre><code>selenium.waitForCondition("selenium.browserbot.getCurrentWindow().$.active==0", defaultWaitingPeriod);
</code></pre>

blocks|key|1034554|text|使用webdriver，也就是selenium2，您可以使用https://www.selenium.dev/documentation/en/webdriver/waits/#implicit-wait上提到的隐式等待配置|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1034555|使用Java：|1034556|WebDriver+driver+=+new+FirefoxDriver();
driver.manage().timeouts().implicitlyWait(10,+TimeUnit.SECONDS);
driver.get("http://somedomain/url_that_delays_loading");
WebElement+myDynamicElement+=+driver.findElement(By.id("myDynamicElement"));|code-block|syntax|javascript|1034557|或者使用python：|1034558|from+selenium+import+webdriver

ff+=+webdriver.Firefox()
ff.implicitly_wait(10)+#+seconds
ff.get("http://somedomain/url_that_delays_loading")
myDynamicElement+=+ff.find_element_by_id("myDynamicElement")|1034559|entityMap|0|LINK|mutability|MUTABLE|url|https://www.selenium.dev/documentation/en/webdriver/waits/#implicit-wait^0|U|20|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

With webdriver aka selenium2 you can use implicit wait configuration as mentionned on
<a href="https://www.selenium.dev/documentation/en/webdriver/waits/#implicit-wait" rel="nofollow noreferrer">https://www.selenium.dev/documentation/en/webdriver/waits/#implicit-wait</a>
Using Java:
<pre class="lang-java prettyprint-override"><code>WebDriver driver = new FirefoxDriver();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.get(&quot;http://somedomain/url_that_delays_loading&quot;);
WebElement myDynamicElement = driver.findElement(By.id(&quot;myDynamicElement&quot;));
</code></pre>
Or using python:
<pre class="lang-python prettyprint-override"><code>from selenium import webdriver

ff = webdriver.Firefox()
ff.implicitly_wait(10) # seconds
ff.get(&quot;http://somedomain/url_that_delays_loading&quot;)
myDynamicElement = ff.find_element_by_id(&quot;myDynamicElement&quot;)
</code></pre>

blocks|key|1034629|text|如果使用python，您可以使用此函数，该函数单击按钮并等待DOM更改：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034630|def+click_n_wait(driver,+button,+timeout=5):
++++source+=+driver.page_source
++++button.click()
++++def+compare_source(driver):
++++++++try:
++++++++++++return+source+!=+driver.page_source
++++++++except+WebDriverException:
++++++++++++pass
++++WebDriverWait(driver,+timeout).until(compare_source)|code-block|syntax|javascript|1034631|(来源:基于this+stack+overflow+answer)|offset|length|1034632|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/8089040/977116^0|0|0|6|Q|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If using python, you may use this function, which clicks the button and waits for the DOM change:

<pre><code>def click_n_wait(driver, button, timeout=5):
 source = driver.page_source
 button.click()
 def compare_source(driver):
 try:
 return source != driver.page_source
 except WebDriverException:
 pass
 WebDriverWait(driver, timeout).until(compare_source)
</code></pre>

(CREDIT: based on <a href="https://stackoverflow.com/a/8089040/977116">this stack overflow answer</a>)

blocks|key|1034717|text|如上所述，您可以等待活动连接关闭：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034718|private+static+void+WaitForReady()+{
++++WebDriverWait+wait+=+new+WebDriverWait(webDriver,+waitForElement);
++++wait.Until(driver+=>+(bool)((IJavaScriptExecutor)driver).ExecuteScript("return+jQuery.active+==+0"));
}|code-block|syntax|javascript|1034719|我的观察是这是不可靠的，因为数据传输发生得非常快。在页面上的数据处理和呈现上消耗了更多的时间，甚至jQuery.active+==+0数据可能还没有出现在页面上。|offset|length|style|CODE|1034720|更明智的做法是使用explicit+wait来显示页面上的元素，请参阅与此相关的一些答案。|1034721|最好的情况是，如果您的web应用程序有一些自定义的加载器或数据正在处理的指示。在这种情况下，您可以等待此指示隐藏。|1034722|entityMap|0|LINK|mutability|MUTABLE|url|http://toolsqa.com/selenium-webdriver/implicit-explicit-n-fluent-wait/^0|0|0|1D|I|0|9|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$I|14|J|15|1|16]]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

As mentioned above you can wait for active connections to get closed:

<pre><code>private static void WaitForReady() {
 WebDriverWait wait = new WebDriverWait(webDriver, waitForElement);
 wait.Until(driver =&gt; (bool)((IJavaScriptExecutor)driver).ExecuteScript("return jQuery.active == 0"));
}
</code></pre>

My observation is this is not reliable as data transfer happens very quickly. Much more time is consumed on data processing and rendering on the page and even <code>jQuery.active == 0</code> data might not be yet on the page.

Much wiser is to use an <a href="http://toolsqa.com/selenium-webdriver/implicit-explicit-n-fluent-wait/" rel="nofollow noreferrer">explicit wait</a> for element to be shown on the page, see some of the answers related to this.

The best situation is if your web application have some custom loader or indication that data is being processed. In this case you can just wait for this indication to hide.

blocks|key|1034781|text|我编写了next方法作为我的解决方案(我没有任何加载指示器)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034782|public+static+void+waitForAjax(WebDriver+driver,+String+action)+{
+++++++driver.manage().timeouts().setScriptTimeout(5,+TimeUnit.SECONDS);
+++++++((JavascriptExecutor)+driver).executeAsyncScript(
+++++++++++++++"var+callback+=+arguments[arguments.length+-+1];"+%2B
+++++++++++++++++++++++"var+xhr+=+new+XMLHttpRequest();"+%2B
+++++++++++++++++++++++"xhr.open('POST',+'/"+%2B+action+%2B+"',+true);"+%2B
+++++++++++++++++++++++"xhr.onreadystatechange+=+function()+{"+%2B
+++++++++++++++++++++++"++if+(xhr.readyState+==+4)+{"+%2B
+++++++++++++++++++++++"++++callback(xhr.responseText);"+%2B
+++++++++++++++++++++++"++}"+%2B
+++++++++++++++++++++++"};"+%2B
+++++++++++++++++++++++"xhr.send();");
}|code-block|syntax|javascript|1034783|然后我用实际的驱动程序调用了这个方法。在此post中有更多说明。|offset|length|1034784|entityMap|0|LINK|mutability|MUTABLE|url|http://hrabosch.com/2016/05/12/35/^0|0|0|L|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I wrote next method as my solution (I hadn't any load indicator):

<pre><code>public static void waitForAjax(WebDriver driver, String action) {
 driver.manage().timeouts().setScriptTimeout(5, TimeUnit.SECONDS);
 ((JavascriptExecutor) driver).executeAsyncScript(
 "var callback = arguments[arguments.length - 1];" +
 "var xhr = new XMLHttpRequest();" +
 "xhr.open('POST', '/" + action + "', true);" +
 "xhr.onreadystatechange = function() {" +
 " if (xhr.readyState == 4) {" +
 " callback(xhr.responseText);" +
 " }" +
 "};" +
 "xhr.send();");
}
</code></pre>

Then I jsut called this method with actual driver.
More description in this <a href="http://hrabosch.com/2016/05/12/35/" rel="nofollow noreferrer">post</a>.

blocks|key|1034858|text|下面的代码(C#)确保显示目标元素：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034859|++++++++internal+static+bool+ElementIsDisplayed()
++++++++{
++++++++++IWebDriver+driver+=+new+ChromeDriver();
++++++++++driver.Url+=+"http://www.seleniumhq.org/docs/04_webdriver_advanced.jsp";
++++++++++WebDriverWait+wait+=+new+WebDriverWait(driver,+TimeSpan.FromSeconds(10));
++++++++++By+locator+=+By.CssSelector("input[value='csharp']:first-child");
++++++++++IWebElement+myDynamicElement+=+wait.Until<IWebElement>((d)+=>
++++++++++{
++++++++++++return+d.FindElement(locator);
++++++++++});
++++++++++return+myDynamicElement.Displayed;
++++++++}|code-block|syntax|javascript|1034860|如果页面支持jQuery，则可以使用jQuery.active+function来确保在所有ajax调用完成后检索目标元素：|offset|length|1034861|+public+static+bool+ElementIsDisplayed()
++++{
++++++++IWebDriver+driver+=+new+ChromeDriver();
++++++++driver.Url+=+"http://www.seleniumhq.org/docs/04_webdriver_advanced.jsp";
++++++++WebDriverWait+wait+=+new+WebDriverWait(driver,+TimeSpan.FromSeconds(10));
++++++++By+locator+=+By.CssSelector("input[value='csharp']:first-child");
++++++++return+wait.Until(d+=>+ElementIsDisplayed(d,+locator));
++++}

++++public+static+bool+ElementIsDisplayed(IWebDriver+driver,+By+by)
++++{
++++++++try
++++++++{
++++++++++++if+(driver.FindElement(by).Displayed)
++++++++++++{
++++++++++++++++//jQuery+is+supported.
++++++++++++++++if+((bool)((IJavaScriptExecutor)driver).ExecuteScript("return+window.$+!=+undefined"))
++++++++++++++++{
++++++++++++++++++++return+(bool)((IJavaScriptExecutor)driver).ExecuteScript("return+$.active+==+0");
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++return+true;
++++++++++++++++}
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++return+false;
++++++++++++}
++++++++}
++++++++catch+(Exception)
++++++++{
++++++++++++return+false;
++++++++}
++++}|1034862|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3148225/jquery-active-function^0|0|0|I|M|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

The code (C#) bellow ensures that the target element is displayed:

<pre><code> internal static bool ElementIsDisplayed()
 {
 IWebDriver driver = new ChromeDriver();
 driver.Url = "http://www.seleniumhq.org/docs/04_webdriver_advanced.jsp";
 WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
 By locator = By.CssSelector("input[value='csharp']:first-child");
 IWebElement myDynamicElement = wait.Until&lt;IWebElement&gt;((d) =&gt;
 {
 return d.FindElement(locator);
 });
 return myDynamicElement.Displayed;
 }
</code></pre>

If the page supports jQuery it can be used the <a href="https://stackoverflow.com/questions/3148225/jquery-active-function">jQuery.active function</a> to ensure that the target element is retrieved after all the ajax calls are finished:

<pre><code> public static bool ElementIsDisplayed()
 {
 IWebDriver driver = new ChromeDriver();
 driver.Url = "http://www.seleniumhq.org/docs/04_webdriver_advanced.jsp";
 WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
 By locator = By.CssSelector("input[value='csharp']:first-child");
 return wait.Until(d =&gt; ElementIsDisplayed(d, locator));
 }

 public static bool ElementIsDisplayed(IWebDriver driver, By by)
 {
 try
 {
 if (driver.FindElement(by).Displayed)
 {
 //jQuery is supported.
 if ((bool)((IJavaScriptExecutor)driver).ExecuteScript("return window.$ != undefined"))
 {
 return (bool)((IJavaScriptExecutor)driver).ExecuteScript("return $.active == 0");
 }
 else
 {
 return true;
 }
 }
 else
 {
 return false;
 }
 }
 catch (Exception)
 {
 return false;
 }
 }
</code></pre>

blocks|key|1034887|text|这是一个基于Morten+Christiansen的答案的很棒的版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034888|void+waitForAjaxCallsToComplete()+{
++++repeatUntil(
++++++++++++{+return+getJavaScriptFunction(driver,+"return+(window.jQuery+%7C%7C+{active+:+false}).active")+},
++++++++++++"Ajax+calls+did+not+complete+before+timeout."
++++)
}

static+void+repeatUntil(Closure+runUntilTrue,+String+errorMessage,+int+pollFrequencyMS+=+250,+int+timeOutSeconds+=+10)+{
++++def+today+=+new+Date()
++++def+end+=+today.time+%2B+timeOutSeconds
++++def+complete+=+false;

++++while+(today.time+<+end)+{
++++++++if+(runUntilTrue())+{
++++++++++++complete+=+true;
++++++++++++break;
++++++++}

++++++++sleep(pollFrequencyMS);
++++}
++++if+(!complete)
++++++++throw+new+TimeoutException(errorMessage);
}

static+String+getJavaScriptFunction(WebDriver+driver,+String+jsFunction)+{
++++def+jsDriver+=+driver+as+JavascriptExecutor
++++jsDriver.executeScript(jsFunction)
}|code-block|syntax|javascript|1034889|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a groovy version based on Morten Christiansen's answer.

<pre><code>void waitForAjaxCallsToComplete() {
 repeatUntil(
 { return getJavaScriptFunction(driver, "return (window.jQuery || {active : false}).active") },
 "Ajax calls did not complete before timeout."
 )
}

static void repeatUntil(Closure runUntilTrue, String errorMessage, int pollFrequencyMS = 250, int timeOutSeconds = 10) {
 def today = new Date()
 def end = today.time + timeOutSeconds
 def complete = false;

 while (today.time &lt; end) {
 if (runUntilTrue()) {
 complete = true;
 break;
 }

 sleep(pollFrequencyMS);
 }
 if (!complete)
 throw new TimeoutException(errorMessage);
}

static String getJavaScriptFunction(WebDriver driver, String jsFunction) {
 def jsDriver = driver as JavascriptExecutor
 jsDriver.executeScript(jsFunction)
}
</code></pre>

blocks|key|1249994|text|如果你等待的控件是一个"+Ajax“web元素，下面的代码将等待它，或者等待任何其他的Ajax+web元素完成加载或执行它需要做的任何事情，这样你就可以更安全地继续你的步骤。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1249995|++++public+static+void+waitForAjaxToFinish()+{

++++WebDriverWait+wait+=+new+WebDriverWait(driver,+10);

++++wait.until(new+ExpectedCondition<Boolean>()+{+
++++++++public+Boolean+apply(WebDriver+wdriver)+{+
++++++++++++return+((JavascriptExecutor)+driver).executeScript(
++++++++++++++++++++"return+jQuery.active+==+0").equals(true);
++++++++}
++++});+

}|code-block|syntax|javascript|1249996|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If the control you are waiting for is an "Ajax" web element, the following code will wait for it, or any other Ajax web element to finish loading or performing whatever it needs to do so that you can more-safely continue with your steps.

<pre><code> public static void waitForAjaxToFinish() {

 WebDriverWait wait = new WebDriverWait(driver, 10);

 wait.until(new ExpectedCondition&lt;Boolean&gt;() { 
 public Boolean apply(WebDriver wdriver) { 
 return ((JavascriptExecutor) driver).executeScript(
 "return jQuery.active == 0").equals(true);
 }
 }); 

}
</code></pre>

blocks|key|1250025|text|这对我来说就像是一种魔力：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250026|public+void+waitForAjax()+{

++++try+{
++++++++WebDriverWait+driverWait+=+new+WebDriverWait(driver,+10);

++++++++ExpectedCondition<Boolean>+expectation;+++
++++++++expectation+=+new+ExpectedCondition<Boolean>()+{

++++++++++++public+Boolean+apply(WebDriver+driverjs)+{

++++++++++++++++JavascriptExecutor+js+=+(JavascriptExecutor)+driverjs;
++++++++++++++++return+js.executeScript("return((window.jQuery+!=+null)+&&+(jQuery.active+===+0))").equals("true");
++++++++++++}
++++++++};
++++++++driverWait.until(expectation);
++++}+++++++
++++catch+(TimeoutException+exTimeout)+{

+++++++//+fail+code
++++}
++++catch+(WebDriverException+exWebDriverException)+{

+++++++//+fail+code
++++}
++++return+this;
}|code-block|syntax|javascript|1250027|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This works like a charm for me :

<pre><code>public void waitForAjax() {

 try {
 WebDriverWait driverWait = new WebDriverWait(driver, 10);

 ExpectedCondition&lt;Boolean&gt; expectation; 
 expectation = new ExpectedCondition&lt;Boolean&gt;() {

 public Boolean apply(WebDriver driverjs) {

 JavascriptExecutor js = (JavascriptExecutor) driverjs;
 return js.executeScript("return((window.jQuery != null) &amp;&amp; (jQuery.active === 0))").equals("true");
 }
 };
 driverWait.until(expectation);
 } 
 catch (TimeoutException exTimeout) {

 // fail code
 }
 catch (WebDriverException exWebDriverException) {

 // fail code
 }
 return this;
}
</code></pre>

blocks|key|1034992|text|这对我来说很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1034993|public++void+waitForAjax(WebDriver+driver)+{
++++new+WebDriverWait(driver,+180).until(new+ExpectedCondition<Boolean>(){
++++++++public+Boolean+apply(WebDriver+driver)+{
++++++++++++JavascriptExecutor+js+=+(JavascriptExecutor)+driver;
++++++++++++return+(Boolean)+js.executeScript("return+jQuery.active+==+0");
++++++++}
++++});
}|code-block|syntax|javascript|1034994|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This work for me 

<pre><code>public void waitForAjax(WebDriver driver) {
 new WebDriverWait(driver, 180).until(new ExpectedCondition&lt;Boolean&gt;(){
 public Boolean apply(WebDriver driver) {
 JavascriptExecutor js = (JavascriptExecutor) driver;
 return (Boolean) js.executeScript("return jQuery.active == 0");
 }
 });
}
</code></pre>

blocks|key|1035028|text|下面是我的fetch代码。因为jQuery.active不能与fetch一起工作，所以我在研究的时候带了我。这是帮助我代理抓取的答案，但它只适用于ajax而不是mock+for+selenium|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1035029|public+static+void+customPatchXMLHttpRequest(WebDriver+driver)+{
++++try+{
++++++++if+(driver+instanceof+JavascriptExecutor)+{
++++++++++++JavascriptExecutor+jsDriver+=+(JavascriptExecutor)+driver;
++++++++++++Object+numberOfAjaxConnections+=+jsDriver.executeScript("return+window.openHTTPs");
++++++++++++if+(numberOfAjaxConnections+instanceof+Long)+{
++++++++++++++++return;
++++++++++++}
++++++++++++String+script+=+"++(function()+{"+%2B+"var+oldFetch+=+fetch;"
++++++++++++++++++++%2B+"window.openHTTPs+=+0;+console.log('starting+xhttps');"+%2B+"fetch+=+function(input,init+){+"
++++++++++++++++++++%2B+"window.openHTTPs%2B%2B;+"

++++++++++++++++++++%2B+"return+oldFetch(input,init).then(+function+(response)+{"
++++++++++++++++++++%2B+"++++++if+(response.status+>=+200+&&+response.status+<+300)+{"
++++++++++++++++++++%2B+"++++++++++window.openHTTPs--;++console.log('Call+completed.+Remaining+active+calls:+'%2B+window.openHTTPs);+return+response;"
++++++++++++++++++++%2B+"++++++}+else+{"
++++++++++++++++++++%2B+"++++++++++window.openHTTPs--;+console.log('Call+fails.+Remaining+active+calls:+'+%2B+window.openHTTPs);++return+response;"
++++++++++++++++++++%2B+"++++++};})"+%2B+"};"+%2B+"var+oldOpen+=+XMLHttpRequest.prototype.open;"
++++++++++++++++++++%2B+"XMLHttpRequest.prototype.open+=+function(method,+url,+async,+user,+pass)+{"
++++++++++++++++++++%2B+"window.openHTTPs%2B%2B;+console.log('xml+ajax+called');"
++++++++++++++++++++%2B+"this.addEventListener('readystatechange',+function()+{"+%2B+"if(this.readyState+==+4)+{"
++++++++++++++++++++%2B+"window.openHTTPs--;+console.log('xml+ajax+complete');"+%2B+"}"+%2B+"},+false);"
++++++++++++++++++++%2B+"oldOpen.call(this,+method,+url,+async,+user,+pass);"+%2B+"}"+%2B

++++++++++++++++++++"})();";
++++++++++++jsDriver.executeScript(script);
++++++++}+else+{
++++++++++++System.out.println("Web+driver:+"+%2B+driver+%2B+"+cannot+execute+javascript");
++++++++}
++++}+catch+(Exception+e)+{
++++++++System.out.println(e);
++++}
}|code-block|syntax|javascript|1035030|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/12575572/monkey-patch-xmlhttprequest-onreadystatechange^0|28|H|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Below is my code for fetch. Took me while researching because jQuery.active doesn't work with fetch. Here is the answer helped me proxy fetch, but its only for ajax not fetch <a href="https://stackoverflow.com/questions/12575572/monkey-patch-xmlhttprequest-onreadystatechange">mock for selenium</a>

<pre><code>public static void customPatchXMLHttpRequest(WebDriver driver) {
 try {
 if (driver instanceof JavascriptExecutor) {
 JavascriptExecutor jsDriver = (JavascriptExecutor) driver;
 Object numberOfAjaxConnections = jsDriver.executeScript("return window.openHTTPs");
 if (numberOfAjaxConnections instanceof Long) {
 return;
 }
 String script = " (function() {" + "var oldFetch = fetch;"
 + "window.openHTTPs = 0; console.log('starting xhttps');" + "fetch = function(input,init ){ "
 + "window.openHTTPs++; "

 + "return oldFetch(input,init).then( function (response) {"
 + " if (response.status &gt;= 200 &amp;&amp; response.status &lt; 300) {"
 + " window.openHTTPs--; console.log('Call completed. Remaining active calls: '+ window.openHTTPs); return response;"
 + " } else {"
 + " window.openHTTPs--; console.log('Call fails. Remaining active calls: ' + window.openHTTPs); return response;"
 + " };})" + "};" + "var oldOpen = XMLHttpRequest.prototype.open;"
 + "XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {"
 + "window.openHTTPs++; console.log('xml ajax called');"
 + "this.addEventListener('readystatechange', function() {" + "if(this.readyState == 4) {"
 + "window.openHTTPs--; console.log('xml ajax complete');" + "}" + "}, false);"
 + "oldOpen.call(this, method, url, async, user, pass);" + "}" +

 "})();";
 jsDriver.executeScript(script);
 } else {
 System.out.println("Web driver: " + driver + " cannot execute javascript");
 }
 } catch (Exception e) {
 System.out.println(e);
 }
}
</code></pre>

blocks|key|1250098|text|在我的例子中，这个问题似乎是由于ajax延迟造成的，但它与主页内部的iframe有关。在seleminum中，可以使用以下命令切换到内部框架：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250099|++++driver.switchTo().frame("body");
++++driver.switchTo().frame("bodytab");|code-block|syntax|javascript|1250100|我使用java。在那之后，我找到了这个元素|1250101|++++driver.findElement(By.id("e_46")).click();|1250102|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case the issue seemed due to ajax delays but was related to internal iframes inside the main page.
In seleminum it is possible to switch to internal frames with:
<pre><code> driver.switchTo().frame(&quot;body&quot;);
 driver.switchTo().frame(&quot;bodytab&quot;);
</code></pre>
I use java. After that I was able to locate the element
<pre><code> driver.findElement(By.id(&quot;e_46&quot;)).click();
</code></pre>

How can I get selenium to wait for something like a calendar widget to load? Right now I am just doing a <code>Thread.sleep(2500)</code> after exporting the testcase to a junit program.

How to get selenium to wait for ajax response?

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