jquery - Enable button until select fields will chosen -

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i try make button enabled/disabled status until user choose 4 select boxes. based on solution: link here link in case can't make working. here fiddle: http://jsfiddle.net/ http://jsfiddle.net/marekandrzejak/nycz6/, wrong?

html:

<form action="classes/script.php" method="post" name="pricelist" style="float:left;"> <div class="price_list option">     <label for="choose_currency">wybierz walutę</label>     <select id="choose_currency" name="choose_currency">         <option value="" selected="selected">wybierz...</option>         <option value="1">pln</option>         <option value="<? echo $obj->getgbprate() ?>">gbp</option>         <option value="<? echo $obj->geteurrate() ?>">eur</option>         <option value="<? echo $obj->getusdrate() ?>">usd</option>     </select> </div> <div class="price_list option">     <label for="vat">podatek vat</label>     <select id="vat" name="vat">         <option value="" selected="selected">wybierz...</option>         <option value="23">23%</option>         <option value="0">0% wdt</option>     </select> </div> <div class="price_list option">     <label for="discount">rabat</label>     <select id="discount" name="discount">         <option value="" selected="selected">wybierz...</option>         <option value="0">0%</option>         <option value="5">5%</option>         <option value="10">10%</option>         <option value="15">15%</option>         <option value="20">20%</option>     </select> </div> <div class="price_list option">     <label for="language">język</label>     <select id="language" name="language">         <option value="" selected="selected">wybierz...</option>         <option value="7">polski</option>         <option value="1">angielski</option>     </select> </div> <button class="button minibutton" id="pricelistbtn" type="submit" name="submit" value="pobierz"><span class="mini_icon mini_icon_zapisz"></span>pobierz</button>

script (in head):

$('#pricelistbtn').attr('disabled', 'disabled');      $(document).ready(      function updateformenabled(){     if (verifyadsettings()) {         $('#pricelistbtn').attr('disabled', '');     } else {         $('#pricelistbtn').attr('disabled', 'disabled');     }   function verifyadsettings() {     if ($('#choose_currency').val() != '' && $('#vat').val() != '' && $('#discount').val() != '' && $('#language').val() != '') {         return true;     } else {         return false;     } } $('#choose_currency').change(updateformenabled); $('#vat').change(updateformenabled); $('#discount').change(updateformenabled); $('#language').change(updateformenabled); } );

please have @ http://jsfiddle.net/89pyb/

$('#pricelistbtn').attr('disabled', 'disabled'); function updateformenabled(){     if (verifyadsettings()) {         $('#pricelistbtn').removeattr("disabled");     } else {         $('#pricelistbtn').attr('disabled', 'disabled');     } }  function verifyadsettings() {     if ($("#choose_currency option:selected").val() != '' && $("#vat option:selected").val() != '' && $('#discount option:selected').val() != '' && $('#language option:selected').val() != '') {         return true;     } else {         return false;     } } $(document).ready(function(){  $('#choose_currency').change(updateformenabled); $('#vat').change(updateformenabled); $('#discount').change(updateformenabled); $('#language').change(updateformenabled); });

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