What scenarios call for the utilization of setScriptTimeout?

When using Selenium WebDriver, there is a method called setScriptTimeout(time, unit). The description of this method states that it

Specifies the time allowed for an asynchronous script to finish executing before an error is thrown. If the timeout is set to negative, the script can run indefinitely.

I have two questions regarding this method -

  1. I am unclear on when exactly this method should be used. It would be greatly appreciated if someone could provide an example for better understanding
  2. If a specific time is set for setScriptTimeout, does each Selenium command (such as locating elements or clicking) wait for all page JavaScripts to finish execution within the specified timeframe?
javascriptseleniumselenium-webdriver

Answer №1

When using setScriptTimeout in Selenium, it is important to understand its specific purpose. This method is used to adjust the amount of time Selenium waits for calls to the executeAsyncScript function to return a response.

If you are utilizing executeAsyncScript and need to set a limit on how long the script can run before declaring it dead if the callback is not called, then setScriptTimeout can be beneficial. For example, you can specify that if an XMLHttpRequest takes more than 10 seconds, the test should fail by using the following code snippet:

driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS);

Object response = ((JavascriptExecutor) driver).executeAsyncScript(
   "var callback = arguments[arguments.length - 1];" +
   "var xhr = new XMLHttpRequest();" +
   "xhr.open('GET', '/resource/data.json', true);" +
   "xhr.onreadystatechange = function() {" +
   "  if (xhr.readyState == 4) {" +
   "    callback(xhr.responseText);" +
   "  }" +
   "}" +
   "xhr.send();");

If the callback is not invoked within the specified time frame, Selenium will raise a timeout error.

It's essential to note that setScriptTimeout does not impact the loading time of pages or any asynchronous operations conducted by the webpage itself.

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