Selnium checks three conditions when it cannot locate an element

When the element cannot be located , Generally, 99% of the problems can be solved by checking three situations ：

1. Check whether the parent of the positioned element exists frame, If there is , First swith_to.frame() cut-in .
 ( Check the method ： Search directly in the element frame keyword )

2. Check the writing correctness of the positioning , If you use ID、NAME When unable to locate , Please use XPATH Positioning method of positioning elements .
 (XPATH Sometimes a single label cannot be located , Please use double positioning , example ：//*[@id="Province"]/a/span[@id="searchBtn"])

3. Suppose that neither of the above two methods solves the positioning problem , Please add a forced wait before positioning time.sleep(3)
  ( After trying the above methods, the problem has not been solved , Please return to 1、2 review )

Be careful ： If using js Written , Please use js Location method to locate

js = 'document.getElementByID("su").click();'
driver.excute_script(js)

Here is a summary of 5 Kind of js Positioning method

except id It's located in a single element Element object , Everything else is elements The return is list object

1. adopt id obtain

document.getElementById(“id”)

2. adopt name obtain

 document.getElementsByName(“Name”)

The return is list

3. Select elements by tag name

document.getElementsByTagName(“tag”)

4. adopt CLASS Class selection element

document.getElementsByClassName(“class”)

Compatibility ：IE8 Browsers below are not implemented getElementsByClassName Method

5. adopt CSS Selectors select elements

document.querySelectorAll(“css selector")