How do I Execute JavaScript code from Java WebDriver?

Executing WebDriver JavaScript from Java: An Enhanced Guide

The command mentioned in the question, ./go webdriverjs, is a shell command designed to set up and initialize the WebDriverJs environment in a specific folder. However, it's important to note that WebDriverJs is a language binding that enables JavaScript tests rather than running JavaScript snippets from Java.

To run JavaScript code within Java WebDriver, utilize the following approach:

<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, consider:

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

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

The JavascriptExecutor offers extensive documentation and capabilities. In its executeScript() method, you can execute function calls, raw JS, return values, and pass complex arguments.

Examples:

1. Fetching a WebElement as in driver.findElement(By.id("someId")):

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

2. Visualizing a WebElement's border:

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

3. Modifying page inputs 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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