$("#calculate").click(function(){ var dbm = $('#dbm').val(); var ovs = $('#ovs').val(); var computation = 0; if(dbm && dbm.length > 0 && ovs && ovs.length > 0){ computation = ((dbm * 1.0)/ovs)*100; } $('#result').html(computation.toFixed(2)); }); $("input").change(function(){ var isInvalid = $('#dbmDiv').hasClass('is-invalid') || $('#ovsDiv').hasClass('is-invalid'); if(isInvalid){ $("#calculate").prop("disabled", true); }else{ $("#calculate").removeAttr('disabled'); } });

Difference Between Medians, ${DBM}$ Number required!

Overall Visible Spread, ${OVS}$ Number required!