When we focus on a row, this row loads all editor params of all editable columns, is there a way to only load the editor params only when we focus on that editable column?
Yes you can pass a callback function into the editorParams column definition option that will be called when the editor is loaded. this function will need to return the params object:
{title:"Name", field:"name", editor:"select", editorParams:function(cell){
return {values:["bob", "steve", "jim"]};
}
full details can be found in the Editor Documentation