Navigate to url, enter Text or click on webelement with Javascript using JavascriptExecutor Interface in selenium and understanding its arguments

JavaScriptExecutor is an Interface implemented by RemoteWebDriver class that helps to execute JavaScript through Selenium Webdriver. It has two methods which help in executing javascript on a webpage.

We will use its executeScript() method to execute javascript.

1) Object executeScript(String javascript, Object... args) - It takes first parameter as the JavaScript to execute, and second parameter is any arguments to the script and may be empty. This method returns Object which may be Boolean, Long, Double, String, List, Map or WebElement or null.

Lets explain how we can execute javascript on a webpage with this method.

Snippet-1  This uses javascipt to navigate to an URL
WebDriver driver = new FirefoxDriver();
JavascriptExecutor executor =(JavascriptExecutor)driver;
executor.executeScript("window.location.href = '';");  
Snippet-2  Click on a web element using javascript only having element id "login-email"
Snippet-3 Click on a webelement using javascript and sending first argument as WebElement
WebElement emailTextField = driver.findElement("login-email"));
Snippet-4 Sending text to webelement using javascript and sending first argument as WebElement and second argument as String


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