Can you explain the concept of JavaScript Executor in Selenium WebDriver?
How is it utilized and what are some practical applications within Selenium WebDriver?
Please provide an illustrative example for better understanding.
Can you explain the concept of JavaScript Executor in Selenium WebDriver?
How is it utilized and what are some practical applications within Selenium WebDriver?
Please provide an illustrative example for better understanding.
JavascriptExecutor is a crucial interface in the world of Selenium, which is implemented by various classes including:
FirefoxDriverChromeDriverInternetExplorerDriverEdgeDriverOperaDriverSafariDriverRemoteWebDriverEventFiringWebDriverHtmlUnitDriverSometimes, when executing your Selenium script, browsers may enforce cross-domain policies leading to unexpected failures without proper error logging. This becomes particularly problematic when attempting XHR requests or accessing other frames.
To delve deeper into this issue, check out the discussion on Uncaught DOMException: Blocked a frame with origin “http://localhost:8080” from accessing a cross-origin frame while listing the iframes in the page
The JavascriptExecutor interface offers two essential methods:
executeScript(): Executes JavaScript within the current frame or window context. Remember that local variables won't persist once the script finishes whereas global variables will.
executeAsyncScript(): Executes asynchronous JavaScript in the current frame or window context. Such scripts must explicitly signal their completion by invoking the provided callback.
Here are a few examples:
Using JS to enter text
String js = "arguments[0].setAttribute('value','"+inputText+"')"
((JavascriptExecutor) webDriver).executeScript(js, element);
Double click through JavaScript
new Actions(driver).moveToElement(myElem, posX, posY).perform();
((JavascriptExecutor)driver).executeScript(jsDoubleClick, myElem, posX, posY);
Sending variable character strings through executeScript()
String myValue = "80120804076";
WebElement pesel = driver.findElement(fldPesel);
jse.executeScript("arguments[0].value='" + myValue + "';", pesel);
You can also explore detailed discussions about the use of arguments in:
In a nutshell:
Utilizing Selenium, you can directly engage with the HTML DOM of a webpage through its interface. This is achieved by running JavaScript expressions using this syntax:
(JavascriptExecutor) driver.executeScript("JavaScript_EXPRESSION_HERE", ADDITIONAL_ARGUMENTS);JavascriptExecutor facilitates automating user actions even in situations where the page hasn't fully loaded or elements obstruct direct interaction.
Conversely, this approach may not replicate a genuine user experience when automating webpages. Therefore, it's advisable to avoid using JavaScript Executor unless there isn't a conventional Selenium method available for accomplishing the task.
JavaScriptExecutor serves as a valuable Interface for executing JavaScript within Selenium Webdriver, offering solutions to various challenges encountered when interacting with web elements. It requires importing the package:
import org.openqa.selenium.JavascriptExecutor;
The Interface provides the following methods:
executeAsyncScript:
executeAsyncScript(java.lang.String script, java.lang.Object… args)
This method executes asynchronous JavaScript within the current frame or window.
executeScript:
executeScript(java.lang.String script, java.lang.Object… args)
Execution of JavaScript can be done using the following syntax:
JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript(Script,Arguments);
For more detailed information and examples on utilizing this interface in different scenarios, please visit the provided link.
Discover more details about the JavascriptExecutor Interface by exploring it:
It signifies that a driver has the ability to execute JavaScript, granting access to the functionality to do so. Due to cross-domain policies enforced by browsers, your script execution might fail unexpectedly and without clear error messages. This becomes crucial especially when creating your own XHR request or attempting to access another frame. In case of troubleshooting failures, it's advisable to check the browser's console after executing the WebDriver request.
In essence, the JavaScript Executor empowers you to run JavaScript code using Selenium WebDriver.
For instance: Scrolling to an element with JavaScript.
element = driver.findElement(By.id("test"));
(JavascriptExecutor) driver.executeScript("arguments[0].scrollIntoView(true);", element);
JavaScriptExecutor is a valuable tool for running JavaScript within Selenium WebDriver. This interface offers two key methods: "executescript" and "executeAsyncScript".
With JavascriptExecutor, you can easily incorporate JavaScript into your automation scripts like so:
JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("window.scrollBy(0,1200);");
Here's my approach using Selenium 3:
driver.execute_script("window.open()")
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