Google Maps API v3标记问题

Question

I'm trying to code a map where you can search for an address, it shows a list with auto-completed items and when you click it takes the marker to the address. If you want to, you can simply drag the marker and don't use the address search.
I was using v2 and was successful with it - I could get the lat and lng values and insert them into hidden inputs, so later I could insert them into a DB.
With V3, the best thing I could do was to show a map and make the search work, but I can insert the lat and lng to the hidden input and I can't make the ONLY marker change place.
If I create a marker to start with the document, when you search and click it'll create another mark.

Here's my code:

function initialize() {

    var myLatlng = new google.maps.LatLng(-1.456688, -48.477586);
  var mapOptions = {
    zoom: 14,
    center: myLatlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };




  var markers = [];
  var map = new google.maps.Map(document.getElementById('map'), mapOptions);

  var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      draggable: true,
      title: 'Hello World!'
  });


  // Create the search box and link it to the UI element.
  var input = /** @type {HTMLInputElement} */(
      document.getElementById('pac-input'));


  var searchBox = new google.maps.places.SearchBox(
    /** @type {HTMLInputElement} */(input));

  // Listen for the event fired when the user selects an item from the
  // pick list. Retrieve the matching places for that item.
  google.maps.event.addListener(searchBox, 'places_changed', function() {
    var places = searchBox.getPlaces();

    if (places.length == 0) {
      return;
    }
    for (var i = 0, marker; marker = markers[i]; i++) {
      marker.setMap(null);
    }

    // For each place, get the icon, place name, and location.
    markers = [];
    var bounds = new google.maps.LatLngBounds();
    for (var i = 0, place; place = places[i]; i++) {
        var image = {
          url: place.icon,
          size: new google.maps.Size(71, 71),
          origin: new google.maps.Point(0, 0),
          anchor: new google.maps.Point(17, 34),
          scaledSize: new google.maps.Size(25, 25)
        };




      // Create a marker for each place.
      var marker = new google.maps.Marker({
        map: map,
        title: place.name,
        position: place.geometry.location,
        draggable: true
      });

      markers.push(marker);

      bounds.extend(place.geometry.location);
    }

    map.fitBounds(bounds);
  });

  // Bias the SearchBox results towards places that are within the bounds of the
  // current map's viewport.
  google.maps.event.addListener(map, 'bounds_changed', function() {
    var bounds = map.getBounds();
    searchBox.setBounds(bounds);
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

I'm sorry for asking that much, but I really spent all my day on the API documentatation and couldn't get it any better.

Answer 1

the SearchBox is not suitable when you search for an address, you better use an Places-Autocomplete.

To change the position of the ONLY marker you only have to set the position-property of the marker.

 function initialize() { var myLatlng = new google.maps.LatLng(-1.456688, -48.477586); var mapOptions = { zoom: 14, center: myLatlng, mapTypeId: google.maps.MapTypeId.ROADMAP }; var map = new google.maps.Map(document.getElementById('map'), mapOptions); var marker = new google.maps.Marker({ position: myLatlng, map: map, draggable: true, title: 'Hello World!' }); //set the value of the hidden inputs when the position changes google.maps.event.addListener(marker, 'position_changed', function() { document.getElementById('latitude').value = this.getPosition().lat(); document.getElementById('longitude').value = this.getPosition().lng(); }); // Create an Autocomplete and link it to the UI element. var input = /** @type {HTMLInputElement} */ ( document.getElementById('pac-input')); map.controls[google.maps.ControlPosition.TOP_CENTER].push(input); var searchBox = new google.maps.places.Autocomplete( /** @type {HTMLInputElement} */ (input), { types: ['geocode'] }); // Listen for the event fired when the user selects an item from the // pick list. Retrieve the matching places for that item. google.maps.event.addListener(searchBox, 'place_changed', function() { var place = this.getPlace(); //when place has been found if (place.geometry) { marker.setOptions({ title: place.name, position: place.geometry.location }); if (place.geometry.viewport) { marker.getMap().fitBounds(place.geometry.viewport); } else { marker.getMap().setCenter(place.geometry.location); } } //otherwise else { marker.setOptions({ title: null }); alert('place not found'); } }); // Bias the SearchBox results towards places that are within the bounds of the // current map's viewport. google.maps.event.addListener(map, 'bounds_changed', function() { var bounds = map.getBounds(); searchBox.setBounds(bounds); }); } google.maps.event.addDomListener(window, 'load', initialize); 

 html, body, #map { height: 100%; margin: 0; padding: 0 } 

 <script src="//maps.googleapis.com/maps/api/js?v=3&libraries=places"></script> <input id="pac-input"/> <input type="hidden" id="latitude"/> <input type="hidden" id="longitude"/> <div id="map"></div>