Selenium C＃无法使用ID，Name或XPath找到Element

Question

I am trying to find an element on a page that is inside a panel(or table, I'm not sure). When using the ID or Name it cannot be located. I am now trying to find the element using the XPath but having trouble. Firebug is no longer supported and I can't locate it using Firefox Development tools (copy XPath) either. I have tried adding wait exceptions and switch frames. I have tried the following code:

web.FindElement(By.XPath("//td(@contains='FirstName'))")).SendKeys("Sarah");

This results in

"Message: OpenQA.Selenium.InvalidSelectorException : Given xpath expression "//td(@contains='FirstName'))" is invalid: SyntaxError: The expression is not a legal expression."

When I use Inspect Element on the webpage the output is this:

<tr>
  <td>First Name:</td>
  <td>
   <input id="ContentPlaceHolder1_ASPxRoundPane14_txtFirstName" name="ctl00$ContentPlaceHolder1$ASPxRoundPanel4$txtFirstName" type="text">
   <br>
   <span id="ContentPlaceHolder1_ASPxRoundPanel4_RequiredFieldValidator2" style="color:Red;visibility:hidden;">First Name must be entered</span>
  </td>
</tr>

I've searched solutions for days but am still coming up empty.

Answer 1

As I said in the comment, your expression is wrong. You can't @ a contains. @ is for attributes in the element. So you want to just grab a specific part of the ID it seems "FirstName". You will need to use "contains()" and inside the parenthesis is where you put the attribute you want to grab. Now the way you are going about it you are saying "equals" and you aren't specifying an attribute. So if you used an attribute, "equals" wouldn't of worked either as "equals" wants the "whole" attribute to equal only "FirstName", which is not the case in your "ID" attribute as it has more than just "FirstName". In order to search an attribute, you need to do the following.

//input[contains(@id, 'FirstName')]

Answer 2

You can't set the "text" of a <td> element since it's a block level element.

You need to set the text of the input.

You can find the input using this selector:

web.FindElement(By.CssSelector("td > input[id$='txtFirstName']")).SendKeys("The First Name")

This CSS Selector means (in English):

Find me a <td> , and immediately proceeding that element, find me an input, that has an id that ends with "txtFirstName"

You can see that there's not much to go on, but txtFirstName in the id attribute looks unique enough.

If you want it simpler ( remember, KISS ;) )

just use

web.FindElement(By.CssSelector("input[id$='txtFirstName']")).SendKeys("The First Name")

Answer 3

试试这个xpath：

`web.FindElement(By.XPath("//input[contains(@id,'FirstName')]")).SendKeys("Sarah");`