如果点击事件侦听器创建的标记，则Google Maps拖拽事件侦听器将不起作用 [英] Google Maps drag and dragend event listeners won't work if marker created by click event listener
问题描述
仅仅是菜鸟想学习，我遇到了一个问题，当我尝试使用click事件创建标记时，drag和dragend事件监听器将无法工作.而默认情况下，创建这些文件即可.
Just a noob trying to learn, I came out with a problem that when I try to create marker with click event, drag and dragend event listeners won't work. Whereas when created by default these work.
这是我到目前为止尝试过的.
Here is what I have tried so far.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"> </script>
<script type="text/javascript">
function initialize() {
var myLatlng = new google.maps.LatLng(22,79);
var myOptions = {
zoom: 5,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
}
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Default Marker',
draggable:true
});
google.maps.event.addListener(map,'click',function(event) {
marker = new google.maps.Marker({
position: event.latLng,
map: map,
title: 'Click Generated Marker',
draggable:true
});
}
);
google.maps.event.addListener(
marker,
'drag',
function(event) {
document.getElementById('lat').value = this.position.lat();
document.getElementById('lng').value = this.position.lng();
//alert('drag');
});
google.maps.event.addListener(marker,'dragend',function(event) {
document.getElementById('lat').value = this.position.lat();
document.getElementById('lng').value = this.position.lng();
alert('Drag end');
});
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:500px;height:500px;"></div>
Lat: <input type="text" id="lat"><br>
Lng: <input type="text" id="lng">
</body></html>
推荐答案
您可能想做的是将事件侦听器中的引用从 this 更改为事件本身.
What you probably want to do is change the reference in your event listeners, from this to the event itself.
然后，您需要在创建新标记的同时为其添加单独的事件侦听器.我建议仅使用一个函数来接收latlng，title和您需要的其他任何内容的输入参数.然后创建标记和所需的所有事件侦听器.
Then you need to add separate event listeners for your new marker at the same time as you create it. I'd suggest simply having one function which takes input arguments for the latlng, title, and anything else you need. And it then creates the marker and any event listeners required.
function initialize() {
var myLatlng = new google.maps.LatLng(22,79);
var myOptions = {
zoom: 5,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
addMarker(myLatlng, 'Default Marker', map);
map.addListener('click',function(event) {
addMarker(event.latLng, 'Click Generated Marker', map);
);
}
function handleEvent(event) {
document.getElementById('lat').value = event.latLng.lat();
document.getElementById('lng').value = event.latLng.lng();
}
function addMarker(latlng,title,map) {
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: title,
draggable:true
});
marker.addListener('drag', handleEvent);
marker.addListener('dragend', handleEvent);
}
这篇关于如果点击事件侦听器创建的标记，则Google Maps拖拽事件侦听器将不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
