如何刪除谷歌地圖api標記後設置

Question

與我的代碼，每次你點擊地圖時出現幾個標記。

我想只是一個單一的標記，每次點擊刪除上一個標記，並設置新的標記的緯度/ lng到新位置。

這裏是我的代碼：

var map; 
    var markers = []; 

    function initMap() { 
     var aa = {lat: 32.3896651, lng: 48.3791718}; 

    map = new google.maps.Map(document.getElementById('map'), { 
     zoom: 12, 
     center: aa 
    }); 

    // This event listener will call addMarker() when the map is clicked. 
    map.addListener('click', function(event) { 
     addMarker(event.latLng); 
     document.getElementById("la").value = event.latLng.lat(); 
document.getElementById("lo").value = event.latLng.lng(); 
    }); 



    } 

    // Adds a marker to the map and push to the array. 
    function addMarker(location) { 
    var marker = new google.maps.Marker({ 
     position: location, 
    flat: false, 
    map: map, 
    draggable: true 
    }); 
    markers.push(marker); 
    } 

    // Sets the map on all markers in the array. 
    function setMapOnAll(map) { 
    for (var i = 0; i < markers.length; i++) { 
     markers[i].setMap(map); 
    } 
    } 

    // Removes the markers from the map, but keeps them in the array. 
    function clearMarkers() { 
    setMapOnAll(null); 
    } 

    // Shows any markers currently in the array. 
    function showMarkers() { 
    setMapOnAll(map); 
    } 

    // Deletes all markers in the array by removing references to them. 
    function deleteMarkers() { 
    clearMarkers(); 
    markers = []; 
    } 

Answer 1

通過增加每一次新的標誌物，要創建在你的網頁許多對象。 爲什麼不重新使用現有的標記？做標記全球而不是標記陣列，

var marker = null; 

，然後使用現有的標記對象的setPosition兩種到改變位置：

marker.setPosition(location); 

通過這種方式，您只使用一個標記，只是在不同的位置。

var map; 
var marker = null; 

function initMap() { 
    var aa = {lat: 32.3896651, lng: 48.3791718}; 

    map = new google.maps.Map(document.getElementById('map'), { 
     zoom: 12, 
     center: aa 
    }); 

// This event listener will call addMarker() when the map is clicked. 
    map.addListener('click', function(event) { 
     addMarker(event.latLng); 
     document.getElementById("la").value = event.latLng.lat(); 
     document.getElementById("lo").value = event.latLng.lng(); 
    }); 

    } 

// Adds a marker to the map and push to the array. 
function addMarker(location) { 
     if(marker) 
      marker.setPosition(location); 
     else 
      marker = new google.maps.Marker({ 
       position: location, 
       flat: false, 
       map: map, 
       draggable: true 
     }); 

    } 

// Sets the map on all markers in the array. 
function setMapOnAll(map) { 

     marker.setMap(map); 

    } 

    // Removes the markers from the map, but keeps them in the array. 
    function clearMarkers() { 
    marker.setMap(null); 
    } 

    // Shows any markers currently in the array. 
    function showMarkers() { 
    marker.setMap(map); 
    } 

    // Deletes all markers in the array by removing references to them. 
    function deleteMarkers() { 
    clearMarkers(); 
    } 

Answer 2

檢查這個文檔瞭解更多信息：

https://developers.google.com/maps/documentation/javascript/examples/marker-remove