How to Execute JavaScript Code with WebDriver in Java?

Executing JavaScript with WebDriver in Java

Integrating JavaScript with WebDriver (Selenium 2) using Java offers enhanced testing capabilities. Following guidelines provided on the Getting Started page, it's important to understand from which location the "./go webdriverjs" command should be executed.

Answer:

The execution of the "./go webdriverjs" command does not require running from a specific folder. This command is typically used when you want to run JavaScript tests using WebDriverJs, an additional language binding for WebDriver that allows writing tests in JavaScript.

However, if your goal is to execute JavaScript code from within Java's WebDriver, the approach differs. To run JavaScript snippets in your Java WebDriver code, utilize the following:

<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>

Alternatively, you can assign the JavascriptExecutor to a variable for later use:

<code class="java">WebDriver driver = new AnyDriverYouWant();
JavascriptExecutor js;
if (driver instanceof JavascriptExecutor) {
    js = (JavascriptExecutor)driver;
}

// later on...
js.executeScript("return document.getElementById('someId');");</code>

The executeScript() method accepts function calls and raw JS, enabling you to manipulate web elements and interact with the page. For example:

• Find an element by ID:

  <code class="java">js.executeScript("return document.getElementById('someId');");</code>

• Add a border to an element:

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

• Change all input elements to radio buttons:

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

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