javascript - Updating Selectbox options -

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i have 2 selectbox

  1. countrynames
  2. airports

and select countryname in first selectbox ajax request sent , returns list of airposts options 

" <option value='1'>abc <option value='3'>lmn <option value='2'>xyz "

now have replace options of select tag. trying like

var country_select = document.getelementbyid("country_select"); country_select.options.length = 0; country_select.options = response.responsetext

but assignment not working how may done!

try

var country_select = document.getelementbyid("country_select"); country_select.innerhtml = response.responsetext;

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