javascript - Restore HTML form state for cascade controls when hitting F5 -

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in page http://carmen-rails-demo.herokuapp.com/ there example country / state selection common in web forms.

let's suppose select united states , colorado , after hit f5. in scenario country code remembered, not state code, because it's loaded ajax.

how can save state , restore after page refresh f5?

you can use localstorage save country , code, this:

$('.country').change(function() {    var country = $(this).val();    localstorage.setitem('country', country);    $.get('states', {country: country}, function(data) {       localstorage.setitem('states', json.stringify(data));       var $states = $('.states');       data.foreach(function(state) {          $states.append('<option value="'+state.value+'">' +                         state.value + '</option>');       });    }); }); $('.states').change(function() {    localstorage.setitem('state', $(this).val()); }); var country = localstorage.getitem('country'); if (country) {     $('.country').val(country); } var states = localstorage.getitem('states'); if (states) {      states = json.parse(states);      var $states = $('.states');      states.foreach(function(state) {          $states.append('<option value="'+state.value+'">' +                         state.value + '</option>');     });     var state = localstorage.getitem('state');     if (state) {         $states.val(state);     } }

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