Selenium JavascriptExecutor doesnt return anything

Question

I initialized a JavascriptExecutor but it doesn't return me what I want. Object is always null.

SeleniumDriver driver = new SeleniumDriver(DriverType.ChromeDriver);
    driver.get("https://www.xxxxxx.info/");
    driver.waitForPageToBeLoaded();
        
    JavascriptExecutor js = (JavascriptExecutor) driver.getWebDriver();
    Object ob = js.executeScript("___grecaptcha_cfg.clients[0]");

Here what it gives me in console:

Why am I not able to get it via JavascriptExecutor?

Have you double checked ___grecaptcha_cfg.clients[0] to make sure it returns not null? — elMeroMero
– elMeroMero, Commented Sep 1, 2020 at 11:32

Mohamed Sulaimaan Sheriff · Accepted Answer · 2020-09-01 13:53:50Z

1

Your js script should return it.try the below changes

Object ob = js.executeScript("return ___grecaptcha_cfg.clients[0]");

so that your code will be like

SeleniumDriver driver = new SeleniumDriver(DriverType.ChromeDriver);
driver.get("https://www.xxxxxx.info/");
driver.waitForPageToBeLoaded();
    
JavascriptExecutor js = (JavascriptExecutor) driver.getWebDriver();
Object ob = js.executeScript("return ___grecaptcha_cfg.clients[0]");

Since it is the JS object json it throws circular reference exception

You can convert to json using below js code

const getCircularReplacer = () => {
  const seen = new WeakSet();
  return (key, value) => {
    if (typeof value === "object" && value !== null) {
      if (seen.has(value)) {
        return;
      }
      seen.add(value);
    }
    return value;
  };
};
JSON.stringify(___grecaptcha_cfg.clients[0], getCircularReplacer());

Since it is cross origin iframe you can use it as chrome blocks it as shown in image below

edited Sep 1, 2020 at 13:53

answered Sep 1, 2020 at 12:03

Mohamed Sulaimaan Sheriff

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6 Comments

user8210794 Over a year ago

gives me Exception in thread "main" org.openqa.selenium.JavascriptException: javascript error: circular reference

Mohamed Sulaimaan Sheriff Over a year ago

Could you please provide me the URL?

user8210794 Over a year ago

vermittlerregister.info/…

Mohamed Sulaimaan Sheriff Over a year ago

@AhmetAzizBeşli It is HTML Dom circular reference and its not a valid json.You should get the required value from javascript and then you should return it to java

user8210794 Over a year ago

is it possible to convert that circular reference to JSON object ?

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