<input name="location" type="text" id="location">

$(document).ready(function() {
    ...
    var autocomplete = new google.maps.places.Autocomplete($('#location')[0]);
    addLocationChangeListener(autocomplete);
   ...
   $("form").submit(function(e){
        doValidations(e, autocomplete);
    });

});

// When user changes location, update map coordinates
function addLocationChangeListener(autocomplete) {
    autocomplete.addListener('place_changed', function() {
        console.log("PLACE CHANGED");
        var place = autocomplete.getPlace();
        console.log("PLACE: ", place);
        console.log("---------------------");
        if(place && place.geometry) {
            ... // save stuff
        }
        ...
    }); // End Add Listener
}

$("#location").on("blur", function() {
      if(autocomplete.getPlace() === undefined) {
          //display error, prevent form submission
     }
});