如何用selenium WebDriver找到文本字段的元素？

Question

I have already an example with google. Explain me please, what means .findElement(By.name("q")); how do WD understand that it's text field?

 WebDriver driver = new HtmlUnitDriver();

        // And now use this to visit Google
        driver.get("http://www.google.com");

        // Find the text input element by its name
        WebElement element = driver.findElement(By.name("q"));

Answer 1

It is selecting an element with the value q for its name attribute. It does not know that the element is an input it is only assigning it to the type WebElement .

If you want to determine if it is an input you can call WebElement#getTagName and get its type via WebElement#getAttribute()

Example

WebDriver driver = new FirefoxDriver();

// And now use this to visit Google
driver.get("http://www.google.com");

// Find the text input element by its name
WebElement element = driver.findElement(By.name("q"));

if (element.getTagName().equalsIgnoreCase("input") 
        && element.getAttribute("type").equalsIgnoreCase("text")) {
    System.out.println("its a textbox");
}