loops - How to show if date is invalid in javascript -

this tried far still nothing changed. don't start maybe professional can me through this. validation purposes.

code:

$(function(){ var len = $('#groupcontainer > div').length; var arr = []; for(var i=0; < len; i++){      var number = $('#number_' + [i + 1]);     var date = $('#date_' + [i + 1]);     var count = + 1;     var message ="";     console.log(number)      var = number.map(function(){         return this.value;     });      var b = date.map(function(){         return this.value;     });      var newobj = {number: a[0], date: b[0]}     arr.push(newobj);  }  var messages={}; var message=""; for(var c = 0; c < arr.length; c++) {              var groupmessage=false;     for(var d in arr[c])     {          if(arr[c].hasownproperty(d))         {                   if(arr[c][d] == "")             {                 if(messages[d]==undefined) {                     messages[d]={groups:[]};                 }                 messages[d].groups.push(c+1);             }          }                 }   }  var lastgroup=""  for(i in messages){     m = messages[i];           var date = $('#date_' + i);     console.log(date)     if(m.groups.join(",")==lastgroup) {         message = message.replace("group "+m.groups.join(",")+" ","group "+m.groups.join(",")+":\n");         if(m == "date" && date.length != 8)         { message += + ' invalid!\n';         }         message+=i+" required!\n";      }else {         message+="group "+m.groups.join(",")+" "+i+" required!\n";     }     lastgroup = m.groups.join(","); } if(message) {     alert(message); } }); 

fiddle

if field not filled show:

   group 1, 2 number required!    group 1, 2 date required! 

valid date must mm/dd/yy

and if date not date:

  group 1, 2 date invalid. 

and if 1 of inputs invalid.

  group 2 date invalid. 

if field filled nothing.

i recommend categorize objects class, example: .txtnumber number .txtdate date

you can use regexpallow keypress event , regexpmatch submit validation.

keypress validation

$(document).on('keyup','.txtdate', function() {     var regexpallow = new regexp('[^0-9/]', 'g');     $(this).val($(this).val().replace(regexpallow,'')); });  $(document).on('keyup','.txtnumber', function() {     var regexpallow = new regexp('[^0-9.]', 'g');     $(this).val($(this).val().replace(regexpallow,'')); }); 

submit validation

$(document).on('click','#btnsubmit', function() {     var regexpmatch = new regexp('^[0-3][0-9]/[0-1][0-9]/[1-2][0-9]{3}$');     $('.txtdate').each(function() {         if ($(this).val().match(regexpmatch) != null) {             alert('valid date:'+$(this).val());         } else {             alert('invalid date:'+$(this).val());         }     });      regexpmatch = new regexp('^[0-9].[0-9]{3}$');     $('.txtnumber').each(function() {         if ($(this).val().match(regexpmatch) != null) {             alert('valid number:'+$(this).val());         } else {             alert('invalid number:'+$(this).val());         }     });        }); 

jsfiddle example: http://jsfiddle.net/bernardobj/o5dbnt51/4/

with can validate characters can entered , how final result (you can validate same way regular expression of numbers if want).

implements logic in code.

note: gets value validate dates , numbers format.