Function in JS library
  /*
   * Checks the length of a string in a grid
   * @param componentElemens - componentDom passed directly from the field
   * @param minLength - The minimum length of the field
   * @param maxLength - The maxium length of the field
   */
  validateGridFieldLength: function(componentElemens, minLength, maxLength){
	var isLengthOk = [];
	var fieldValue = null;
	if(componentElemens.length > 1){
		for(var i = 0; i < componentElemens.length; i++){
			fieldValue = componentElemens[i].firstChild.value;
			if((fieldValue.length >= minLength) && (fieldValue.length <= maxLength)){
				isLengthOk[i] = true;
			
			}
			else{
				isLengthOk[i] = false;
			}
		}
		for ( var i = 0; i < isLengthOk.length; i++) {
			if (!(isLengthOk[i])){
				return false;
			}
		}
		return true;
	}
	else{
		fieldValue = componentElemens[0].firstChild.value;
		if((fieldValue.length >= minLength) && (fieldValue.length <= maxLength)){
			return true;
		}
		else{
			return false;
		}
	}
  },


Validation call on the column in the grid

return ptLibrary.validateGridFieldLength(componentDom, 0, 2000);