html - Javascript calculation returns NaN, when only first 2 sum inserted - 


function kanded_arvutus()    {   var deebet1 = document.getelementbyid("deebet1").value;   var kreedit1 = document.getelementbyid("kreedit1").value;   var deebet2 = document.getelementbyid("deebet2").value;   var kreedit2 = document.getelementbyid("kreedit2").value;     var kokku_deebet = parsefloat(deebet1)+parsefloat(deebet2);   document.getelementbyid("kokku_deebet").value = kokku_deebet.tofixed(2);      var kokku_kreedit = parsefloat(kreedit1)+parsefloat(kreedit2);   document.getelementbyid("kokku_kreedit").value = kokku_kreedit.tofixed(2);        }

and html

<input onclick="kanded_arvutus();" onchange="kanded_arvutus();" type="text" class="form-control" name="deebet'.$i.'" id="deebet'.$i.'"  placeholder="0" value="">               <input value="" onclick="kanded_arvutus();" onchange="kanded_arvutus();" type="text" class="form-control" name="kreedit'.$i.'" id="kreedit'.$i.'"  placeholder="0">   <input type="text" class="form-control field" name="kokku_deebet" value="" id="kokku_deebet" placeholder="0">  <input type="text" class="form-control field" name="kokku_kreedit" value="" placeholder="0" id="kokku_kreedit">

and if insert kreedit1 , deebet1 values, jquery returns nan , if insert deebet2 , kreedit2 also, working.

someone maybe see, wrong here ?

thanks in advance, aimar.

please check variables not null or notdefined below, before addition,

if (typeof(deebet1) != 'undefined' && deebet1 != null && typeof(deebet2) != 'undefined' && deebet2 != null) {     var kokku_deebet = parsefloat(deebet1)+parsefloat(deebet2);     document.getelementbyid("kokku_deebet").value = kokku_deebet.tofixed(2); }  if (typeof(kreedit1) != 'undefined' && kreedit1 != null && typeof(kreedit2) != 'undefined' && deebet2 != null) {     var kokku_deebet = parsefloat(kreedit1)+parsefloat(kreedit2);     document.getelementbyid("kokku_kreedit").value = kokku_deebet.tofixed(2); }

as john suggested can use following, check whether variables has real values.

if (deebet1 && deebet2)     {         var kokku_deebet = parsefloat(deebet1)+parsefloat(deebet2);         document.getelementbyid("kokku_deebet").value = kokku_deebet.tofixed(2);     }      if (kreedit1 && kreedit2)     {         var kokku_deebet = parsefloat(kreedit1)+parsefloat(kreedit2);         document.getelementbyid("kokku_kreedit").value = kokku_deebet.tofixed(2);     }

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