javascript - How to get validation to work properly on my input fields -


this question has answer here:

i have managed fields calculate trying add validation them proving difficult. aim make sure fields have contain numbers , have filled in.

function audience_details() if(fields.length === 0) {      var aud1, aud2, total;      var aud1 = parseint(document.getelementbyid("audience_1_field").value);      var aud2 = parseint(document.getelementbyid("audience_2_field").value);      var reach = parseint(document.getelementbyid("reach_field").value);      var total = (aud1 + aud2 - reach ) / aud1 * 100 ;      total_field.value =  parsefloat(total).tofixed(2) + '%';      estimate.value =  parsefloat(total).tofixed(2) + '%'; } else {      //alert fields must complete / contain numbers only! }

any lovely here form http://jsfiddle.net/pjf2v7b8/

please try answer : 

function audience_details(){      var aud1, aud2, total;      if(document.getelementbyid("audience_1_field").value == "" || !onlynos(document.getelementbyid("audience_1_field"))){             alert("please enter valid number in audience 1");      }      else if(document.getelementbyid("audience_2_field").value == "" || !onlynos(document.getelementbyid("audience_2_field"))){              alert("please enter valid number in audience 2");      }      else if(document.getelementbyid("reach_field").value == "" || !onlynos(document.getelementbyid("reach_field"))){             alert("please enter valid number in reache field");      }      else{         var aud1 = parseint(document.getelementbyid("audience_1_field").value);         var aud2 = parseint(document.getelementbyid("audience_2_field").value);         var reach = parseint(document.getelementbyid("reach_field").value);         var total = (aud1 + aud2 - reach ) / aud1 * 100 ;         total_field.value =  parsefloat(total).tofixed(2) + '%';      }  }      function onlynos(e) {         try {             if (e) {                 var charcode = e.value;                  if (charcode.charcodeat() > 31 && (charcode.charcodeat() < 48 || charcode.charcodeat() > 57))                      return false;                 else { return true; }             }             else{return false;}         }         catch (err) {             alert(err.description);         }     }

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