Selenium等待特定的XHR请求完成

huangapple
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英文:

Selenium wait for specific XHR request to be complete

问题

你好，我正在进行一个Selenium项目，我所遇到的主要困难是等待XHR请求完成。我目前正在使用以下预期条件等待请求被发出，

  1. public ExpectedCondition<Boolean> jQueryExpect(int expectedActive) {
  2.     ExpectedCondition<Boolean> jQLoad = new ExpectedCondition<Boolean>() {
  3.         @Override
  4.         public Boolean apply(WebDriver dr) {
  5.             try {
  6.                 logger.log(Level.INFO, "Checking number of jQueries Active");
  8.                 Long active = (Long) ((JavascriptExecutor) driver).executeScript("return jQuery.active");
  10.                 logger.log(Level.INFO, "jQuery's active: {0}", active);
  11.                 return (active >= expectedActive);
  12.             } catch (Exception e) {
  14.                 logger.log(Level.WARNING, "Error executing script in jQueryLoad method");
  15.                 // no jQuery present
  16.                 return true;
  17.             }
  18.         }
  19.     };
  20.     return jQLoad;
  21. }

然后，我使用以下预期条件等待jQuery加载完成：

  1. public ExpectedCondition<Boolean> jQueryLoad(int expectedActive) {
  2.     ExpectedCondition<Boolean> jQLoad = new ExpectedCondition<Boolean>() {
  3.         @Override
  4.         public Boolean apply(WebDriver dr) {
  5.             try {
  6.                 logger.log(Level.INFO, "Checking number of jQueries Active");
  8.                 Long active = (Long) ((JavascriptExecutor) driver).executeScript("return jQuery.active");
  10.                 logger.log(Level.INFO, "jQuery's active: {0}", active);
  11.                 return (active <= expectedActive);
  12.             } catch (Exception e) {
  14.                 logger.log(Level.WARNING, "Error executing script in jQueryLoad method");
  15.                 // no jQuery present
  16.                 return true;
  17.             }
  18.         }
  19.     };
  20.     return jQLoad;
  21. }

这个方法目前效果还不错，因为我知道有多少个请求要等待。但正如您已经注意到的，由于某些原因请求的数量发生变化，这个方法未来很容易失效。

我一直在查阅Cypress文档，发现了这个。根据Cypress文档，它等待指定的请求被发出。

  1. cy.wait(['@getUsers', '@getActivities', '@getComments']).then((xhrs) => {
  3.   // xhrs现在将是匹配的XHR数组
  4.   // xhrs[0] <-- getUsers
  5.   // xhrs[1] <-- getActivities
  6.   // xhrs[2] <-- getComments
  7. })

Selenium中是否有类似的方法？或者是否有实现这个的方法？到目前为止，根据我的搜索，我什么都没有找到。所以，任何帮助将不胜感激。

英文:

Hi i am working on a selenium project and the top difficulty that i am having was waiting for XHR request to be completed. What i am currently doing is i wait for a request to be made using following expected condition,

  1. public ExpectedCondition&lt;Boolean&gt; jQueryExpect (int expectedActive) {
  2.     ExpectedCondition&lt;Boolean&gt; jQLoad = new ExpectedCondition&lt;Boolean&gt;() {
  3.         @Override
  4.         public Boolean apply(WebDriver dr) {
  5.             try {
  6.                 logger.log(Level.INFO,&quot;Checking number of jQueries Active&quot;);
  8.                 Long active = (Long) ((JavascriptExecutor) driver).executeScript(&quot;return jQuery.active&quot;);
  10.                 logger.log(Level.INFO,&quot;jQuery&#39;&#39;s active: {0}&quot;,active);
  11.                 return (active &gt;= expectedActive);
  12.             }
  13.             catch (Exception e) {
  15.                 logger.log(Level.WARNING,&quot;Error executing script in jQueryLoad method&quot;);
  16.                 // no jQuery present
  17.                 return true;
  18.             }
  19.         }
  20.     };
  21.     return  jQLoad;
  22. }

And then i wait for the jQuery to load using this expected condition

  1. public ExpectedCondition&lt;Boolean&gt; jQueryLoad (int expectedActive) {
  2.     ExpectedCondition&lt;Boolean&gt; jQLoad = new ExpectedCondition&lt;Boolean&gt;() {
  3.         @Override
  4.         public Boolean apply(WebDriver dr) {
  5.             try {
  6.                 logger.log(Level.INFO,&quot;Checking number of jQueries Active&quot;);
  8.                 Long active = (Long) ((JavascriptExecutor) driver).executeScript(&quot;return jQuery.active&quot;);
  10.                 logger.log(Level.INFO,&quot;jQuery&#39;&#39;s active: {0}&quot;,active);
  11.                 return (active &lt;= expectedActive);
  12.             }
  13.             catch (Exception e) {
  15.                 logger.log(Level.WARNING,&quot;Error executing script in jQueryLoad method&quot;);
  16.                 // no jQuery present
  17.                 return true;
  18.             }
  19.         }
  20.     };
  21.     return  jQLoad;
  22. }

This method is working pretty solid for now since i know how many requests to expect. But as you have already noticed it can easily break in future as number of requests made are changed for some reason.

I been looking at cypress documentation and found this. According to cypress documentation this waits for the specified requests to be made.

  1. cy.wait([&#39;@getUsers&#39;, &#39;@getActivities&#39;, &#39;@getComments&#39;]).then((xhrs) =&gt; {
  3. // xhrs will now be an array of matching XHR&#39;s
  4.   // xhrs[0] &lt;-- getUsers
  5.   // xhrs[1] &lt;-- getActivities
  6.   // xhrs[2] &lt;-- getComments
  7. })

Is there any such method available in Selenium? or Is there any way this can be implemented? So far from what i have googled i got nothing. So any help will be appreciated.

答案1

得分: 1

你可以定位元素并等待元素。在Selenium中有隐式等待和显式等待。

你可以使用以下任一方法：

  1. WebDriverWait wait = new WebDriverWait(webDriver, timeoutInSeconds);
  2. wait.until(ExpectedConditions.visibilityOfElementLocated(By.id&lt;locator&gt;));

或者

  1. wait.until(ExpectedConditions.elementToBeClickable(By.id&lt;locator&gt;));

更多信息请参见：此答案链接

英文:

You can locate Element and wait for element
There are Implicit and Explicit waits in selenium.

You can use either

  1. WebDriverWait wait = new WebDriverWait(webDriver, timeoutInSeconds);
  2. wait.until(ExpectedConditions.visibilityOfElementLocated(By.id&lt;locator&gt;));

or

  1. wait.until(ExpectedConditions.elementToBeClickable(By.id&lt;locator&gt;));

More information: on this answer

huangapple
  • 本文由 发表于 2020年9月17日 14:59:51
  • 转载请务必保留本文链接：https://go.coder-hub.com/63932825.html
  • java
  • selenium
  • webdriverwait
  • xmlhttprequest
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