javascript - How do I disable input field when certain select list value is picked -


how disable , make input field text hidden when value selected select list? in code, need disable , make input text hidden when "united states" selected drop down.

my html: jsfiddle link

my javascript:

document.getelementbyid('billingcountrycode').onchange = function () {     if(this.value != '840') {         document.getelementbyid("billingstateprovince").disabled = true;         document.getelementbyid("billingstateprovince").style.display="none"     } else {         document.getelementbyid("billingstateprovince").disabled = false;         document.getelementbyid("billingstateprovince").style.display="block"     } }

the problem fiddle have 2 elements same id. can there, change id on either state dropdown or text input. updated code might this, if name text input same 2:

document.getelementbyid('billingcountrycode').onchange = function () {     if(this.value != '840') {         document.getelementbyid("billingstateprovince").disabled = true;         document.getelementbyid("billingstateprovince").style.display="none";         document.getelementbyid("billingstateprovince2").disabled = false;         document.getelementbyid("billingstateprovince2").style.display="block";     }      else {         document.getelementbyid("billingstateprovince").disabled = false;         document.getelementbyid("billingstateprovince").style.display="block";         document.getelementbyid("billingstateprovince2").disabled = true;         document.getelementbyid("billingstateprovince2").style.display="none";     } }

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