html - Based on selection, "mailto:" link changes to "mailto: variable" using javascript -


i'm trying make form. way work user chooses option drop-down list. click confirm location button. click send email link. when click confirm location button, changes mailto link in send email link, based on selection in drop-down list. however, cannot figure how change mailto link mailto variable t holds value of email address (based on selection.) (see 3rd last line in code) please help! 

<form>select place:     <select id="myselect">         <option value="email@domain.com">location 1</option>         <option value="email2@domain.com">location 2</option>         <option value="email3@domain.com">location 3</option>         <option value="email4@domain.com">location 4</option>     </select> </form> <button type="button" onclick="displayresult()">confirm location</button> <a id="myemaillist" href="mailto:">send email</a> <script type="text/javascript"> function displayresult() {     var x = document.getelementbyid("myselect");     t = x.value     document.getelementbyid("myemaillist").href = "mailto:"t; } </script>

um, concatenate values?

document.getelementbyid("myemaillist").href = "mailto:"+t;

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