How do I execute JavaScript code in Selenium WebDriver Java?

Using JavaScript with Selenium WebDriver Java

Question:

You mentioned running the command ./go webdriverjs in your guide. From which folder/location should this command be run?

Answer:

The ./go webdriverjs command is unrelated to using JavaScript with Selenium WebDriver Java. It is used for a different WebDriver language binding, namely JavaScript.

Using JavaScript with Java WebDriver

To run JavaScript code in Java WebDriver, you need to use the JavascriptExecutor class. Here's how to do it:

<code class="java">WebDriver driver = new AnyDriverYouWant();
if (driver instanceof JavascriptExecutor) {
    ((JavascriptExecutor)driver).executeScript("yourScript();");
} else {
    throw new IllegalStateException("This driver does not support JavaScript!");
}</code>

This executeScript() method takes function calls and raw JS, allowing you to perform various actions on the web page. Here are some examples:

• Return a specific WebElement:

  <code class="java">WebElement element = (WebElement) ((JavascriptExecutor) driver).executeScript("return document.getElementById('someId');");</code>

• Draw a border around an element:

  <code class="java">WebElement element = driver.findElement(By.id("someId"));
  ((JavascriptExecutor) driver).executeScript("arguments[0].style.border='3px solid red'", element);</code>

• Change all input elements to radio buttons:

  <code class="java">((JavascriptExecutor) driver).executeScript(
         "var inputs = document.getElementsByTagName('input');" +
         "for(var i = 0; i < inputs.length; i++) { " +
         "    inputs[i].type = 'radio';" +
         "}" );</code>

This demonstrates how to use JavaScript code in Java WebDriver for interacting with the web page and performing advanced actions.

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