javascript - Jquery change function error checking form for input type=number -

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i'm implementing timer, , trying figure out how error check input boxes in form random strings or characters aren't numbers. putting in character or string doesn't seem trigger change() function, , i'm guessing it's because have type="number" in html. i'm hesitant change type = "text" because spinner , down arrows come type="number" input boxes.

is there easy way check 4 input boxes @ once instead of having "else" statement 4 boxes? i'm thinking there has elegant way this. i'm starting out javascript, appreciated. :)

js:

$(function(){     $("#sec").change(function(){         secs = parseint( $("#sec").val() || -1);         mins = parseint( $("#min").val() || -1);         hours = parseint( $("#hour").val() || -1);         days = parseint( $("#day").val() || -1);          console.log("secs " + secs);         if($("#sec").val() >= 60){             var newsecs = secs % 60;             var newmins =  mins + math.floor(secs/60);//can > 60             var newhours = hours + math.floor(mins/60);             var newdays = days + math.floor(hours/24);              $("#sec").val(newsecs);             $("#min").val(newmins);             $("#hour").val(newhours);             $("#day").val(newdays);         }          else if(secs < 0 || !(typeof $("#sec").val() === 'number' && (secs % 1) === 0)){             alert("please enter valid time interval");             $(this).val("");             return;         }     }); });  //minutes changed $(function(){     $("#min").change(function(){         mins = parseint( $("#min").val() || -1);         hours = parseint( $("#hour").val() || -1);         days = parseint( $("#day").val() || -1);           console.log("mins " + mins);         if($("#min").val() >= 60){             var newmins = mins % 60//can > 60             var newhours = hours + math.floor(mins/60);             var newdays = days + math.floor(hours/24);              $("#min").val(newmins);             $("#hour").val(newhours);             $("#day").val(newdays);         }          else if(mins < 0 || !(typeof $("#min").val() === 'number' && (mins % 1) === 0)){             alert("please enter valid time interval");             $(this).val("");             return;         }     }); });  //hours changed $(function(){     $("#hour").change(function(){         hours = parseint( $("#hour").val() || -1);         days = parseint( $("#day").val() || -1);          console.log("hours " + hours);         if($("#hour").val() >= 24){             var newhours = hours % 24;             var newdays = days + math.floor(hours/24);              $("#hour").val(newhours);             $("#day").val(newdays);         }          else if(hours < 0 || !(typeof $("#hour").val() === 'number' && (hours % 1) === 0)){             alert("please enter valid time interval");             $(this).val("");             return;         }     }); });

html:

<form class="form-inline" id="input">          <div class="form-group col-xs-2">             <input id="day" class="form-control input-sm input" type="number" value="" placeholder="days">         </div>         <div class="form-group col-xs-2">             <input id="hour" class="form-control input-sm input" type="number" value=""  placeholder="hours">         </div>         <div class="form-group col-xs-2">             <input id="min" class="form-control input-sm input" type="number" value=""  placeholder="minutes">         </div>         <div class="form-group col-xs-2">             <input id="sec" class="form-control input-sm input" type="number" value="" placeholder="seconds">         </div>     </form>


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