javascript - Google Maps API v3 - Set destination but leave origin blank? -


i'm setting gmaps api current project, , map load direction map destination set (dynamically populated address), origin blank user can quickly/easily put in own address. examples i've seen require origin put in well. there way around this?

probably looking this:

function initmap() {      var directionsservice = new google.maps.directionsservice;      var directionsdisplay = new google.maps.directionsrenderer;      var map = new google.maps.map(document.getelementbyid('map'), {          zoom: 7,          center: { lat: 41.85, lng: -87.65 }      });      directionsdisplay.setmap(map);        var onchangehandler = function () {          calculateanddisplayroute(directionsservice, directionsdisplay);      };      document.getelementbyid('btngo').addeventlistener('click', onchangehandler);  }    function calculateanddisplayroute(directionsservice, directionsdisplay) {      directionsservice.route({          origin: document.getelementbyid('start').value,          destination: document.getelementbyid('end').value,          travelmode: google.maps.travelmode.driving      }, function (response, status) {          if (status === google.maps.directionsstatus.ok) {              directionsdisplay.setdirections(response);          } else {              window.alert('directions request failed due ' + status);          }      });  }
 html, body {              height: 100%;              margin: 0;              padding: 0;          }            #map {              height: 100%;          }            #floating-panel {              position: absolute;              top: 10px;              left: 25%;              z-index: 5;              background-color: #fff;              padding: 5px;              border: 1px solid #999;              text-align: center;              font-family: 'roboto','sans-serif';              line-height: 30px;              padding-left: 10px;          }
  <div id="floating-panel">          <b>start: </b>          <input id="start"/>          <b>end: </b>          <select id="end">              <option value="chicago, il">chicago</option>              <option value="st louis, mo">st louis</option>              <option value="joplin, mo">joplin, mo</option>              <option value="oklahoma city, ok">oklahoma city</option>              <option value="amarillo, tx">amarillo</option>              <option value="gallup, nm">gallup, nm</option>              <option value="flagstaff, az">flagstaff, az</option>              <option value="winona, az">winona</option>              <option value="kingman, az">kingman</option>              <option value="barstow, ca">barstow</option>              <option value="san bernardino, ca">san bernardino</option>              <option value="los angeles, ca">los angeles</option>          </select>          <button id="btngo">get directions</button>      </div>      <div id="map"></div>      <script src="https://maps.googleapis.com/maps/api/js?callback=initmap"              async defer></script>

basically it's customized version of directions service sample

example: start: san francisco


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