jquery - MVC Controller returning JSON to populate Select list but value needs to have a colon -

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we have mvc controller returns json want.
populate select list options values have colon in them. json: {result: {["valueone": "option 1: option", "valuetwo" : "option 2: other option"]}

we populating list jquery $.ajax

 $("#eventnamedropdownlist").change(function () {                    geteventdatesandtimes();                })             function geteventdatesandtimes() {                var eventname = $('#eventnamedropdownlist').val();// on eventnamedropdownlist value coming "option 1:" instead of whole value.                 var url = '@url.action("geteventdatetimebyname", "product")';                $("#eventidanddatedropdownlist").find('option').remove().end(); // clear before appending new list                $.ajax({                    url: url,                    type: "get",                    cache: false,                    datatype: "json",                    data: { eventname: eventname },                    success: function (data) {                        console.log("success");                        if (data.eventdatetimelist.length) {                            $.each(data.eventdatetimelist, function (i, event) {                                console.log("foreach: " + event.eventname);                                $("#eventidanddatedropdownlist").append("<option value=" + event.startdatetime + ">" + event.startdatetime + "</option>")                            });                        } else {                            $("#eventidanddatedropdownlist").find('option').remove().end(); // clear before appending new list                             console.log("result no data");                         }                     },                    error: function () {                        $("#eventidanddatedropdownlist").find('option').remove().end(); // clear list                        alert("an error occurred getting event names");                    }                });            }

which working populate option list fine.

example want happen:

<select>   <option value="option 1: option">option 1: option</option>   <option value="option 2: option">option 2: other option</option> </select>

but comes out

<select>   <option value="option 1:" option>option 1: option</option>   <option value="option 2:" option>option 2: other option</option> </select>

as can see in option value property string terminates after colon, whole value json string colon not surrounded quotes.

simply concatenate using ' like

'<option value="' + event.startdatetime + '">' + event.startdatetime + '</option>'

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