Javascript to update text box when radio button are automatically checked -


i creating set of radio buttons, when checked, update text box of options checked. however, if select 1 of 4 options remaining part of text box populate 'undefined' each remaining button isn't clicked, in case three.

to try , avoid getting 'undefined' , show options in text field @ once created script automatically check radio buttons after time has passed. but, doesn't update text field if had clicked on button. ideas?

here's code checks them, , code puts them in text field..

var allelems = document.getelementsbytagname('input');   settimeout(function() {    (i = 0; < allelems.length; i++) {     if (allelems[i].type == 'radio') {         allelems[i].checked = true;         }     }    }, 5000);    $('input[name="o1"]').on('change', function() {      $('input[id="text-yui_3_17_2_1_1502294158679_90364-field"]').val($('input[name="o1"]:checked').val()+$('input[name="o2"]:checked').val()+$('input[name="o3"]:checked').val()+$('input[name="o4"]:checked').val()); });  


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