Selenium and asynchronous JavaScript calls

Question

i\'m quite new to Selenium and JavaScript-callback functions and i have a big issue I can\'t solve myself. I need a specified variable using JavaScript. If I open the page w

Answer 1

Though this is almost same as what @Louis said.You have to set the setScriptTimeout beforehand for the script to pass.

The default timeout for a script to be executed is 0ms. In most cases, including the examples below, one must set the script timeout WebDriver.Timeouts.setScriptTimeout(long, java.util.concurrent.TimeUnit) beforehand to a value sufficiently large enough.

Below is an example for which I'm waiting for 10 seconds to return a string

  driver.manage().timeouts().setScriptTimeout(20, TimeUnit.SECONDS);//important

    JavascriptExecutor executor = (JavascriptExecutor) driver;
    String val = (String) executor.executeAsyncScript(""
            + "var done=arguments[0]; "
            + "setTimeout(function() {"
            + "   done('tada');"
            + "  }, 10000);");

    System.out.println(val);