select box posting to jquery ajax appends [] to the field name -

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i have select box on page post jquery using .ajax , works great when select box can select 1 value, when change "multiple" appends [] end of field name. example listid without multiple fine, "multiple" attribute changes name listid[]. idea what's happening?

<select multiple size="5" name="frmrecipientlist" id="listid">  $.ajax({             url: '/app/components/mailingsreport.cfc',             //post method used             type: "post",             complete: function(){                 $("#loader").hide();             },             //pass data              data: {                 method: "createemailing",                 title: $('#title').val(),                 campaignid: $('#campaignid').val(),                 brandid: $('#brandid').val(),                 listid: $('#listid').val(),                 maxrecipients: $('#maxrecipients').val(),                 subject: $('#subject').val(),                 fromname: $('#viewfrom').val(),                 testtoemail: $('#testtoemail').val(),                 htmlcode:  $('#htmlcode').val()                  },             datatype: "html",

listid <select multiple>. means there can multiple values. [] makes array, on server, can read values.


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