如何通过Selenium和C＃从子节点获取属性

Question

Below mentioned is a node in a webpage and the objective is to get the data inside the attribute "onclick". I am aware that i can use GetAttribute("onclick") to get the data.

But for a reason I am only locating the td inside which this input node is present. Can someone tell if there is a way to get the attribute data "onclick" of the child 'input' node from parent 'td' node.

 <td align="center">
    <input type="button" class="button" value="View Pdf" onclick="showFilePreView('98374');">
    </td>

Answer 1

If you use selenium-webdriver, then you could find the parent element first, then use childElement = parentElemnent.FindElement(By.) to find the child.

In your case, you could try the code below:

IWebElement parentElement = YourWebDriver.FindElement(By.TagName("td"));
// those codes above assume that there is only one "td" node in your case.    

IWebElement childElement = parentElement.FindElement(By.Name("button"));
String theStringYouWant = childElement.GetAttribute("onclick");

Hope those code could solve your case.

Answer 2

The desired element is an dynamic element so to get the value of the attribute onclick ie showFilePreView('98374') you have to induce WebDriverWait for the element to be visible and you can use either of the following solutions:

• CssSelector :

   new WebDriverWait(driver, TimeSpan.FromSeconds(20)).Until(ExpectedConditions.ElementIsVisible(By.CssSelector("td[align='center']>input.button[value='View Pdf']"))).GetAttribute("onclick") 

• XPath :

   new WebDriverWait(driver, TimeSpan.FromSeconds(20)).Until(ExpectedConditions.ElementIsVisible(By.XPath("//td[@align='center']/input[@class='button' and @value='View Pdf']"))).GetAttribute("onclick"); 

Note : Here the assumption is the <td> node is unique within the HTML DOM