javascript - Convert datalist option to json -

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i have form , have variables include in json object. created function 1 of form fields datalist variable , can't find way covert json. function: 

$('#mybtn2').click(function() {     var form_server = {             "id": json.parse($('#id').val()),             "type": "service",             "name": $("#name").val(),             "msg_types": [6,7,8,9],             "billing_id": json.parse($('#billing_id').val()),             "billing_name": $("#partner").val(),             "ips": [$('#ips').val()],             "url": $('#callbackurl').val(),         };      var json_server = json.stringify(form_server, null, 2);      $('#mybtn2').after('<pre>' + json_server + '</pre>');  });

the html form looks this: 

<label for="id">id: </label> <input id="id" name="id" type= "number"/><br> <label for="name">service name: </label> <input id="name" name="name" type="text" /><br> <br><label for="billing_id">billing id (partner id/guid): </label> <input id="billing_id" name="billing_id" type= "number"/><br>  <label for="ips">ip addresses: </label> <input id="ips" name="ips" type="text" /><br>  <label for="url">callback url: </label> <input id="callbackurl" name="callbackurl" type="url" /><br>  <input name="mybtn2" id="mybtn2" type="button" value="submit data" />  <label>partner name</label><br>please add partner if not on list bellow<br> <input list="partner" name="partner" type="text"> <datalist id="partner">     <option value="42">42</option>     <option value="sms">sms</option>     <option value="online">online</option> </datalist><br>

when choose option list , press submit button receive correct json billing name empty: " ".

try using selector $("input[list=partner]") , removing trailing comma , following $('#callbackurl').val()

$('#mybtn2').click(function() {    var form_server = {      "id": json.parse($('#id').val()),      "type": "service",      "name": $("#name").val(),      "msg_types": [6, 7, 8, 9],      "billing_id": json.parse($('#billing_id').val()),      "billing_name": $("input[list=partner]").val(),      "ips": [$('#ips').val()],      "url": $('#callbackurl').val()    };      var json_server = json.stringify(form_server, null, 2);      $('#mybtn2').after('<pre>' + json_server + '</pre>');    });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <label for="id">id:</label>  <input id="id" name="id" type="number" />  <br>  <label for="name">service name:</label>  <input id="name" name="name" type="text" />  <br>  <br>  <label for="billing_id">billing id (partner id/guid):</label>  <input id="billing_id" name="billing_id" type="number" />  <br>    <label for="ips">ip addresses:</label>  <input id="ips" name="ips" type="text" />  <br>    <label for="url">callback url:</label>  <input id="callbackurl" name="callbackurl" type="url" />  <br>    <input name="mybtn2" id="mybtn2" type="button" value="submit data" />    <label>partner name</label>  <br>please add partner if not on list bellow  <br>  <input list="partner" name="partner" type="text">  <datalist id="partner">    <option value="42">42</option>    <option value="sms">sms</option>    <option value="online">online</option>  </datalist>  <br>


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