[英]javascript variable is undefined even defined?
var markers;
function initListMarkers() {
var markers;
var mpMarkers = [
['place 1', 13.784420, 100.684456, 1],
['', 13.744571, 100.436233, 7],
['', 13.807593, 100.510734, 8],
['', 13.783086, 100.493740, 9],
['', 13.806426, 100.578541, 10],
['', 13.660516, 100.605148, 11],
['', 13.761079, 100.710033, 12],
['', 13.691707, 100.750974, 13],
['', 13.680032, 100.476874, 14],
['', 13.678364, 100.747069, 15],
['swb', 13.676029, 100.734709, 16],
];
var infoWindowContent = [
['<div class="myplace-info-content"><h3>place 1</h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3></h3><p></p></div>'],
['<div class="myplace-info-content"><h3>swb</h3><p>suwarnnabhumi airport</p></div>'],
];
var infoWindow = new google.maps.InfoWindow(), marker, i;
for( i = 0; i < mpMarkers.length; i++ ) {
var position = new google.maps.LatLng(mpMarkers[i][1], mpMarkers[i][2]);
bounds.extend(position);
marker = new google.maps.Marker({
position: position,
map: map,
title: mpMarkers[i][0]
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infoWindow.setContent(infoWindowContent[i][0]);
infoWindow.open(map, marker);
}
})(marker, i));
var mp_id = mpMarkers[i][3];
markers[mp_id] = marker;
map.fitBounds(bounds);
}
var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function(event) {
this.setZoom(12);
google.maps.event.removeListener(boundsListener);
});
}
在螢火蟲說
TypeError:標記未定義
markers [mp_id] =標記;
但標記已定義。 首先是外部功能。 函數內部的第二位ID。
下面的功能工作正常。
function addMarkerDraggable(group_id) {
// get current view center location
var current_view = map.getCenter();
var current_lat = current_view.lat();
var current_lng = current_view.lng();
/**
* set variable from ajax fixed by http://stackoverflow.com/questions/14220321/how-to-return-the-response-from-an-ajax-call
*/
var mp_id = get_from_ajax_as_json();
mp_id = mp_id.responseJSON;
mp_id = mp_id.mp_id;
if (mp_id != 'undefined' && mp_id != '') {
// myplace id was set, set marker.
marker = new google.maps.Marker({
draggable: true,
position: current_view,
icon: default_marker_icon,
map: map,
title: '',
animation: google.maps.Animation.DROP
});
// set markers array for easy to remove.
markers[mp_id] = marker;
}
}// addMarkerDraggable
為什么它的工作方式不同而應該相同?
如何從函數initListMarkers()設置標記數組?
您已經聲明了markers
但尚未為其分配任何值。 如果要使其成為數組,只需將其值初始化為一個新數組,如下所示:
var markers = [];
當您具有按特定順序排列的元素序列(索引編號為0… n)時,數組是理想的選擇。 但是,從粗略地看代碼的情況來看,似乎更像是將其用作關聯數組或映射,其中您有許多項目(無特定順序)由字符串索引。 在這種情況下,通常更適合使用對象:
var markers = {};
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