RealGrid2 Guide
Cell components
place Holder

Place Holder

If there is no value in the cell, you can display a notice using the Place Holder function. Check the product number column.

var columns = [
   ...
   {
     name: "ProductId",
     fieldName: "ProductId",
     width: "130",
     header: {
       text: "Product number",
       styleName: "orange-column"
     },
     placeHolder: "Enter the product number.",
     //placeHolderStyleName: "pink-cell" //Used when specifying a separate style
   },
   ...
];
 
gridView.setColumns(columns);