Table: Requiring Subsequent Columns

//For loop to constantly check on the Table
for ( var i=0; i < Column_1.value.length; i++) {

  //if there is something entered in the first column, then the following columns are required
  if (Column_1[i].value !== ""){
    Column_2[i].required = true;
    Column_3[i].required = true;
    Column_4[i].required = true; 

  } else { 
    Column_1[i].required = false; 
    Column_1l[i].value = null;

    Column_2[i].required = false;
    Column_2[i].value = null; 

    Column_3[i].required = false;
    Column_3[i].value = null;

    Column_4[i].required = false;
    Column_4[i].value = null; 
  }
}