javascript - How can I fix my JS and jQuery to properly validate input? -


i brand new js , jquery. have written basic html form calculate values , wanting validate each input , test see if contains non-zero value can't figure out. have spent time searching before posting this. remember new take easy on me, please. here script test inputs.

$('#ppm_pt').on('change', function () {     var input = $(this);     var is_num = input.val();     if (is_num)      {          $('#calculate').prop("disabled", false)      }     else     {          $('#calculate').prop("disabled", true)      } });

i can work check if there input ppm_pt, instead wanting check inputs of type number in html form , instead of checking value want test against nulls , 0 values. know there way. have tried using each() method unsuccessful. please help. thanks.

you doing id selection on element if form like:

$('#ppm_pt').on('change', 'input', function () {     var input = $(this);     var is_num = input.val();     if (is_num !== '')      {          $('#calculate').prop("disabled", true);      }     else     {          $('#calculate').prop("disabled", false);      } });

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