TypeError: ' Stepup ' called on a object that does not implement interface htmlinputelement.

The problem I encountered when I wrote the program today, I did not realize when I started to complete the function. When the program updates again, out of error, the FIREBUG discovery hint is typeerror: ' Stepup ' called on a object that does not implement interface Htmlinputelement .

      var sort=$ ("#add input[name= ' sort ']"). Val ();      var pid=$ ("#add select[name= ' pid ')". Val (PID);      var remark=$ ("#add textarea[name= ' remark ']"). Val ();

Note that this is my error code and I want to get those values for the specified tag. The correct code is

      var sort=$ ("#add input[name= ' sort ']"). Val ();      var pid=$ ("#add select[name= ' pid ')". Val ();      var remark=$ ("#add textarea[name= ' remark ']"). Val ();

Discover the differences between the two fragments. is one more thing in the second row, Val (). Just get rid of it.

TypeError: ' Stepup ' called on a object that does not implement interface htmlinputelement.