te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>jquery - Google Maps JavaScript API v3 remove markers - Stack Overflow

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    I have looked at a large number of "similar" questions and none of the solutions/answers seem to work for me so here we go: I am generating a simple Google Map with a single marker "onload" I then have a menu list a bit like this

    <ul>
<li class="toggle" id="beaches">Item</li>
<li class="toggle" id="towns">Item</li>
<ul>

    that on click uses these arrays to marker-populate the map

    jQuery - 

    $(".toggle").click(function(){
setMarkers(map,$(this).attr('id'));
});

var beaches = [
['Beach 1',38.285827, 20.611038, 4],
['Beach 2', 38.304958,20.604515, 5],
['Beach 3',38.301691,20.597649, 3]
];

var towns = [
['Town 1',38.343003, 20.535679, 4],
['Town 2',38.339334,20.545807, 5]
];

    My population function looks like this:

    function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
}

    But what I need/want to do is clear all markers first before adding the new ones. Suggestions please Thanks

    I have looked at a large number of "similar" questions and none of the solutions/answers seem to work for me so here we go: I am generating a simple Google Map with a single marker "onload" I then have a menu list a bit like this

    <ul>
<li class="toggle" id="beaches">Item</li>
<li class="toggle" id="towns">Item</li>
<ul>

    that on click uses these arrays to marker-populate the map

    jQuery - 

    $(".toggle").click(function(){
setMarkers(map,$(this).attr('id'));
});

var beaches = [
['Beach 1',38.285827, 20.611038, 4],
['Beach 2', 38.304958,20.604515, 5],
['Beach 3',38.301691,20.597649, 3]
];

var towns = [
['Town 1',38.343003, 20.535679, 4],
['Town 2',38.339334,20.545807, 5]
];

    My population function looks like this:

    function setMarkers(map, locations) {
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];
var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
}

    But what I need/want to do is clear all markers first before adding the new ones. Suggestions please Thanks

    • javascript
    • jquery
    • google-maps
    • google-maps-api-3
    • google-maps-markers
    Share Improve this question edited May 17, 2012 at 7:07 Engineer 48.8k12 gold badges90 silver badges92 bronze badges asked May 17, 2012 at 6:56 Russell ParrottRussell Parrott 9037 gold badges19 silver badges39 bronze badges
    Add a ment  | 

    4 Answers 4

    Reset to default 9

    You need to store markers, and call setMap(null) for every marker to remove from map.

    You could try something like this:

    var setMarkers = (function() {
    var oldMarkers = null;
    return function(map, locations){
        //Clearing markers, if they exist
        if(oldMarkers && oldMarkers.length !== 0){
            for(var i = 0; i < oldMarkers.length; ++i){
                oldMarkers[i].setMap(null);
            }
        }
        //Adding new markers
        oldMarkers = [];
        for (var i = 0; i < locations.length; i++) {
            var newmarker = locations[i];
            var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
            var marker = new google.maps.Marker({
               position: myLatLng,
               map: map,
               title: newmarker[0],
               zIndex: newmarker[3]
            });
            oldMarkers.push( marker );
        }
   };
})();

    Maybe you could use one function that empty array that contains markers:

    function clear(){
   if(locations){
        for(var i=0;i<location.length;i++){
            locations[i].setMap(null);
        }
        locations.length=0;
    }
}

    You need to make sure your markers are stored in a array and then to remove do some thing like 

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

      }

    So your code would now be 

    var markers [];

function setMarkers(map, locations) {
// remove all markers first 
removeMarkers();
for (var i = 0; i < locations.length; i++) {
var newmarker = locations[i];

var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: newmarker[0],
zIndex: newmarker[3]
});
//add to marker array 
markers.push(marker);
}

    You could define a global array of markers and clearing those by calling setMap(null) before you re-populate the map:

    var markers = [];

function setMarkers(map, locations) {
    for (var i = 0; i < locations.length; i++) {
        var newmarker = locations[i];
        var myLatLng = new google.maps.LatLng(newmarker[1], newmarker[2]);

        if (markers[i]) {
            markers[i].setMap(null);
        }

        markers[i] = new google.maps.Marker({
            position: myLatLng,
            map: map,
            title: newmarker[0],
            zIndex: newmarker[3]
        });
    }
}

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