구글맵 - 컨트롤에 상태 추가하기 (예제 - 위치저장하기)

컨트롤에 상태 추가하기

컨트롤이 상태를 보관할 수도 있습니다. 다음 예는 위에 표시된 예와 비슷하지만, 새로운 홈 위치를 표시하도록 컨트롤을 설정하는 추가 '홈 설정' 버튼이 컨트롤에 포함됩니다. 이 작업은 컨트롤에 상태를 저장하고 해당 상태에 대한 getters 및 setters를 제공할 home_ 속성을 만들어서 수행합니다.

var map;
var chicago = new google.maps.LatLng(41.850033, -87.6500523);

/**
 * The HomeControl adds a control to the map that
 * returns the user to the control's defined home.
 */

// Define a property to hold the Home state
HomeControl.prototype.home_ = null;

// Define setters and getters for this property
HomeControl.prototype.getHome = function() {
  return this.home_;
}

HomeControl.prototype.setHome = function(home) {
  this.home_ = home;
}

function HomeControl(map, div, home) {

  // Get the control DIV. We'll attach our control UI to this DIV.
  var controlDiv = div;

  // We set up a variable for the 'this' keyword since we're adding event
  // listeners later and 'this' will be out of scope.
  var control = this;

  // Set the home property upon construction
  control.home_ = home;

  // Set CSS styles for the DIV containing the control. Setting padding to
  // 5 px will offset the control from the edge of the map
  controlDiv.style.padding = '5px';

  // Set CSS for the control border
  var goHomeUI = document.createElement('DIV');
  goHomeUI.title = 'Click to set the map to Home';
  controlDiv.appendChild(goHomeUI);

  // Set CSS for the control interior
  var goHomeText = document.createElement('DIV');
  goHomeText.innerHTML = 'Home';
  goHomeUI.appendChild(goHomeText);
  
  // Set CSS for the setHome control border
  var setHomeUI = document.createElement('DIV');
  setHomeUI.title = 'Click to set Home to the current center';
  controlDiv.appendChild(setHomeUI);

  // Set CSS for the control interior
  var setHomeText = document.createElement('DIV');
  setHomeText.innerHTML = 'Set Home';
  setHomeUI.appendChild(setHomeText);

  // Setup the click event listener for Home:
  // simply set the map to the control's current home property.
  google.maps.event.addDomListener(goHomeUI, 'click', function() {
    var currentHome = control.getHome();
    map.setCenter(currentHome);
  });

  // Setup the click event listener for Set Home:
  // Set the control's home to the current Map center.
  google.maps.event.addDomListener(setHomeUI, 'click', function() {
    var newHome = map.getCenter();
    control.setHome(newHome);
  });
}

function initialize() {
  var mapDiv = document.getElementById('map_canvas');
  var myOptions = {
    zoom: 12,
    center: chicago,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  map = new google.maps.Map(mapDiv, myOptions);

  // Create the DIV to hold the control and call the HomeControl()
  // constructor passing in this DIV.
  var homeControlDiv = document.createElement('DIV');
  var homeControl = new HomeControl(map, homeControlDiv, chicago);

  homeControlDiv.index = 1;
  map.controls[google.maps.ControlPosition.TOP_RIGHT].push(homeControlDiv);
}

예 보기(control-custom-state.html)