De- Select blank value from combo and Sorting when no value in column

Webix JS
1

I have this example http://webix.com/snippet/cc80eafd
Q) How can I put bank or no value in to cell when cell is filled with value? If I try to remove any value then after blur cell will be populate with older value again. Where actual result would be no record.
Q) If i populate some blank value in cell then Sorting record in ascending order show bank value first where I want to completely neglect the blank value.

2

1 . The blank option should be added to the options collection:

gradesCollection.push({ id:"", value:""});

2 . You can write a custom sorting function instead of a built-in algorithm.

3

  1. Thanks for you replay work!

  2. Ok If I want to write custom algorithm I suppose to extend the sort right?