JavaScriptExecutor is an Interface that helps to execute JavaScript through Selenium Webdriver. JavaScriptExecutor provides two methods 'executescript' & 'executeAsyncScript' to run javascript on the selected window or current page.
What is JavaScriptExecutor?
Generated by dossier. Mar 08, 2018 Running tests asynchronously across various browsers will save a lot of time, and Selenium WebDriver provides this functionality. Selenium handles asynchronous testing by using JavaScript promises. Now, let’s write the first code and create one simple test that checks if Selenium works stand alone, without using Mocha. Selenium WebDriver fits in the same role as RC did, and has incorporated the original 1.x bindings. It refers to both the language bindings and the implementations of the individual browser controlling code. This is commonly referred to as just 'WebDriver' or sometimes as Selenium 2. Selenium 1.0 + WebDriver = Selenium 2.0.
In this tutorial, you will learn -
Why do we need JavaScriptExecutor?Javascript Selenium Example
In Selenium Webdriver, locators like XPath, CSS, etc. are used to identify and perform operations on a web page.
In case, these locators do not work you can use JavaScriptExecutor. You can use JavaScriptExecutor to perform an desired operation on a web element.
Selenium supports javaScriptExecutor. There is no need for an extra plugin or add-on. You just need to import (org.openqa.selenium.JavascriptExecutor) in the script as to use JavaScriptExecutor.
JavaScriptExecutor Methods
With Asynchronous script, your page renders more quickly. Instead of forcing users to wait for a script to download before the page renders. This function will execute an asynchronous piece of JavaScript in the context of the currently selected frame or window in Selenium. The JS so executed is single-threaded with a various callback function which runs synchronously.
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This method executes JavaScript in the context of the currently selected frame or window in Selenium. The script used in this method runs in the body of an anonymous function (a function without a name). We can also pass complicated arguments to it.
The script can return values. Data types returned are
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The basic syntax for JavascriptExecutor is given below:
Syntax:
Example of executeAsyncScript
Using the executeAsyncScript, helps to improve the performance of your test. It allows writing test more like a normal coding.
The execSync blocks further actions being performed by the Selenium browser but execAsync does not block action. It will send a callback to the server-side Testing suite once the script is done. It means everything inside the script will be executed by the browser and not the server.
Example 1: Performing a sleep in the browser under test.
In this scenario, we will use 'Guru99' demo site to illustrate executeAsyncScript. In this example, you will
Step 1) Capture the start time before waiting for 5 seconds ( 5000 milliseconds) by using executeAsyncScript() method.
Step 2) Then, use executeAsyncScript() to wait 5 seconds.
Step 3) Then, get the current time.
Step 4) Subtract (current time – start time) = passed time.
Step 5) Verify the output it should display more than 5000 milliseconds Best free screen recording software.
Output: Successfully displayed the passed time more than 5 seconds(5000 miliseconds) as shown below:
Example of executeScript
For executeScript, we will see three different example one by one.
1) Example: Click a button to login and generate Alert window using JavaScriptExecutor.
In this scenario, we will use 'Guru99' demo site to illustrate JavaScriptExecutor. In this example,
Selenium Webdriver Tutorial
Output: When the code is executed successfully. You will observe
2) Example: Capture Scrape Data and Navigate to different pages using JavaScriptExecutor.
Execute the below selenium script. In this example,
Output: When above code is executed successfully, it will it will fetch the details of the site and navigate to different page as shown below.
3) Example: Scroll Downusing JavaScriptExecutor.
Execute the below selenium script. In this example,
Output: When above code is executed, it will scroll down by 600 pixels (see image below).
Summary:
JavaScriptExecutor is used when Selenium Webdriver fails to click on any element due to some issue.
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