Detect value of selected value when inserting a new item

[caldera500]

Is there a way to detect when the value of a dropdown gets changed when inserting a new item. I want to disable some of the other inputs depending on the value that is detected.

{insertTemplate: function(value, item){
  if(item.value == 'A'){
   $("#grid").jsGrid("fieldOption", "Size", "inserting", false);
},
 name: 'category', title: 'Category', type: 'select', 
      items:['', A ', 'B', 'C, 'D']},

I can detect the value of the dropdown like this:

$(document).on('change','#grid .jsgrid-insert-row select',function(){
  console.log("change detected", this.value);
});

However setting the field option after the grid is created is not possible using
$("#grid").jsGrid("fieldOption", "Size", "inserting", false);