Display Data After Submit, but ....

we still are working on grid.js right?. So if my column is called rut (the id) and I don't want to show me all the records, if I said don't show me data when rut is empty, could be some like this?

if(ds=rut|"")return;

I'm trying some alternatives but don't work. I'm starting to desesperate.

I have one column filtered only, the column rut, bue don't work

if(ds="rut|")return;

the submit button don't work even if i put a correct rut id, don't show me anything, but I delet the code and come back to work again.

What can be happening?

I don't change any other line of code, only the mentioned in this post.

Hi, another day, I'm trying another things...

alert(ds); give me this results...

with ==
if(ds=="rut|")return;
if I put an incorrect Id don't show me any results, it's ok
if I put a correct id, it show me the data asociated to the id, it's ok
but... if the search box is empty still show me all the data...
the alert alert(ds); show me rut%7C%7C when empty search box
and when I put a correct id for example 12345678-9 it show me rut%712345678-9C%7C

with =
if(ds="rut|")return;
don't work anything, the submit button don't give any result, neither if I put a correct id, nothing happen.

with === the same thing, don't work.

What it supposed the alert(ds) has to show me?