javascript - check if field value has changed with jquery -

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i want conastantly check if value changes.. if user selects new value in input form want run js code..

<div class="select2-container country_to_state country_select" id="s2id_billing_country" style="width: 100%;">     <a href="javascript:void(0)" class="select2-choice" tabindex="-1">         <span class="select2-chosen" id="select2-chosen-1">schweiz</span>         <abbr class="select2-search-choice-close" />         <span class="select2-arrow" role="presentation">     <b role="presentation"/>     </span>     </a>     <label for="s2id_autogen1" class="select2-offscreen">land *</label>     <input class="select2-focusser select2-offscreen" type="text" aria-haspopup="true" role="button" aria-labelledby="select2-chosen-1" id="s2id_autogen1" /> </div> <select name="billing_country" id="billing_country" class="country_to_state country_select " tabindex="-1" title="land *" style="display: none;">     <option value="">land auswählen…</option>     <option value="de" selected="selected">deutschland</option>     <option value="ch">schweiz</option>     <option value="at">Österreich</option> </select>

i've tried far (doesn't work)

$('#select2-chosen-1').change(function() {     alert("change"); });

first off should never have 2 elements same id on page. use classes instead

<span class="select2-chosen">value 1</span> <span class="select2-chosen">value 2</span>  $('input').on('change', '.select2-chosen', (function()  {      alert("change");  });

here have had implement delegated event listener input's dynamically generated select2 after page instantiation. listen it's change event , alert.

alternatively, give <input class="select2-focusser select2-offscreen" , <select name="billing_country".. class of someclass , listen change

$('.someclass').change(function()  {     alert("change"); });

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