javascript - show options in select tag when a specific option is selected in other select tag from json -

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i have 3 select tags in html document , , when select 1st option 1st select tag, want show other options in second select tag hidden, need load options external file json. how can ?

for e.x have object

var object = {     usa: {         californina: ['san fransisco',                        'san diego'         ],nevada: ['las vegas',                      'reno']      } }

when select usa option in 1st select tag, want show states (california,nevada) in second select box, , when choose nevada option want show city(las vegas, reno) in 3d select tag!

i want options kept in external json file! how can load json file?

having json this: {"resource":"a","literals":["b","c","d"]} , taking account want read external json file, can follow different answers post: how read external local json file in javascript.

after read information need, can or append options your(s) select(s) (what best way add options select array jquery?) or replace option , append again(how remove , replace select options using jquery?)

probably, want add events after user select option. that, use post jquery select change event selected option

i hope you, best regards


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