Selenium CSS selector throwing OpenQA.Selenium.InvalidSelectorException - what's wrong?

Question

I am attempting to find a table cell using a CSS selector in Selenium. This is my selector:

//table[@id='prepaymentItemsDataGrid']//tr[@class='tablerowlight']/td[3] 

The exception being thrown is:

Driver.FindElementByCssSelector("//table[@id='prepaymentItemsDataGrid']//tr[@class='tablerowlight']/td[3]") threw an exception of type 'OpenQA.Selenium.InvalidSelectorException' 

What is wrong with my selector? How do I know what Selenium is complaining about?

I have tried simplifying it to:

//table[@id='prepaymentItemsDataGrid'] 

which has no effect.

Does Selenium have a different method of executing CSS selectors and how can I check that the selector is valid before trying to run it?

Answer 1

Though you have tried to use FindElementByCssSelector() but the values were of XPath. You can use either of the following Locator Strategies :

• CssSelector :

  Driver.FindElementByCssSelector("table#prepaymentItemsDataGrid tr.tablerowlight > td:nth-of-type(3)"); 

• XPath :

  Driver.FindElementXPath("//table[@id='prepaymentItemsDataGrid']//tr[@class='tablerowlight']/td[3]");