Question

我在谷歌地图标记方面遇到了一些麻烦。我有一个包含7个位置的数组。当页面加载时，“for”循环遍历数组并将前四个位置作为标记放在地图上。我当时想要发生的是能够单击“删除并添加标记”按钮，该按钮将运行一个函数（称为addMarker2）以删除原始的4个位置标记，并将最后3个位置标记添加到地图中。

我已经测试了这个功能，只添加了最后3个标记，它运行正常。但是当我添加代码以在添加最后3个标记之前删除前4个标记时，它不再起作用。我一直在寻找答案，几乎所有我发现的东西似乎都表明我正确地做到了，尽管显然我不是。

var mapCanvas = document.getElementById('map-canvas');
var mapOptions = {
  center: new google.maps.LatLng(40, -95),
  zoom: 4,
  mapTypeId: google.maps.MapTypeId.ROADMAP
}

// create the map
var map = new google.maps.Map(mapCanvas, mapOptions);

// array of locations
var pins = [
         ['Cleveland',41.499321,-81.694359],
         ['Florence',34.195435,-79.762566],
         ['Knoxville',35.960638,-83.920739],
         ['Memphis',35.149532,-90.048981],
         ['Nashville',36.162664,-86.781602],
         ['Phoenix',33.448376,-112.074036],
         ['Toronto',43.653225,-79.383186]
    ];


// Loop through the array of locations & place each one on the map  
for( i = 0; i < 4; i++ ) {
    var position = new google.maps.LatLng(pins[i][1], pins[i][2]);
    var marker = new google.maps.Marker({
        position: position,
        map: map,
        icon: 'http://i.imgur.com/FPiUErC.png',
        title: pins[i]['0']
    });
} // end of the for loop


function addmarker2() {
    // remove the first four markers
    for( i = 0; i < 4; i++ ) {
       pins[i].setMap(null); 
    }

    // add the last three markers
    for( i = 4; i < 7; i++ ) {
        var myPosition = new google.maps.LatLng(pins[i][1], pins[i][2]);
        var marker = new google.maps.Marker({
            position: myPosition,
            map: map,
            icon: 'http://i.imgur.com/FPiUErC.png',
            title: pins[i][0]
        });
    } // end of for loop
} // end of addmarker2 function


$("#mysubmit").click(addmarker2);

我使用setMap（null）的方式有些不对劲。 I have a jsfiddle of the code.它一开始不起作用，但是如果你注释掉试图删除前4个标记的“for”循环，那么它将成功添加最后的3个标记。我只需要它来做两个。

Answer 1

如果其他人遇到同样的问题并发现这个问题，正如光线所述，我需要创建一个数组来将标记推入，然后将setMap（null）应用于markers数组，而不是应用它到包含我的位置信息的原始数组（pins []）。

var mapCanvas = document.getElementById('map-canvas');
var mapOptions = {
  center: new google.maps.LatLng(40, -95),
  zoom: 4,
  mapTypeId: google.maps.MapTypeId.ROADMAP
}

// create the map
var map = new google.maps.Map(mapCanvas, mapOptions);

// array of locations
var pins = [
         ['Cleveland',41.499321,-81.694359],
         ['Florence',34.195435,-79.762566],
         ['Knoxville',35.960638,-83.920739],
         ['Memphis',35.149532,-90.048981],
         ['Nashville',36.162664,-86.781602],
         ['Phoenix',33.448376,-112.074036],
         ['Toronto',43.653225,-79.383186]
    ];

// this array will hold the markers
var markers = [];

// Loop through the array of locations & place each one on the map  
for( i = 0; i < 4; i++ ) {
    var position = new google.maps.LatLng(pins[i][1], pins[i][2]);
    var marker = new google.maps.Marker({
        position: position,
        map: map,
        icon: 'http://i.imgur.com/FPiUErC.png',
        title: pins[i]['0']
    });
    //each marker is added to the markers array
    markers.push(marker);
} // end of the for loop


function addmarker2() {
    // remove the first four markers
    for( i = 0; i < 4; i++ ) {
       // the loop removes the first four results from the markers array
       markers[i].setMap(null); 
    }

    // add the last three markers
    for( i = 4; i < 7; i++ ) {
        var myPosition = new google.maps.LatLng(pins[i][1], pins[i][2]);
        var marker = new google.maps.Marker({
            position: myPosition,
            map: map,
            icon: 'http://i.imgur.com/FPiUErC.png',
            title: pins[i][0]
        });
    } // end of for loop
} // end of addmarker2 function


$("#mysubmit").click(addmarker2);

Answer 2

我已经通过在开发者控制台上输入来进行调试，并且我找到了一种删除所有标记的方法。（使用array.push()方法保存）

以下是代码 - 只需致电neutralize()：

function neutralize() {
    for (var i = 0; i < markers.length; i++) {
        try{
            markers[i].f.setMap(null);
         }
        catch{
            markers[i].setMap(null);
         }    
    }

    markers = [];
}

javascript - 无法删除谷歌地图标记

2 个答案: