在Google地圖上獲取標記的座標

Question

我想要將我的谷歌地圖上的兩個標記的經度和緯度都取得一些文本框。我一直在遵循這一建議使用一些指南：

google.maps.event.addListener(marker, 'dragend', function (event) { 
document.getElementById("latbox").value = this.getPosition().lat(); 
document.getElementById("lngbox").value = this.getPosition().lng(); 
}); 

和

var lat = marker.getPosition().lat(); 
var lng = marker.getPosition().lng(); 

但是，我的文本框沒有得到任何東西填充。

谷歌地圖代碼（模糊了關鍵，但它工作得很好，因爲我可以訪問地圖）：

<div class="content"> 
<div class="map" id="map"></div> 
<script> 
function initMap() { 
var cpe = {lat: -20.269401 , lng: 57.497840}; 
var pl = {lat: -20.187042 , lng: 57.498377}; 
var map = new google.maps.Map(document.getElementById('map'), { 
zoom: 11, 
center: cpe 
}); 
var marker = new google.maps.Marker({ 
position: cpe, 
map:map, 
draggable:true, 
label: "P" 


}); 

ar infowindow = new google.maps.InfoWindow({ 
content: "Pickup Point" 
}); 

marker.addListener('mouseover', function() { 
infowindow.open(map, marker); 
}); 

var marker2 = new google.maps.Marker({ 
position: pl, 
map:map, 
draggable:true, 
icon: 'http://maps.google.com/mapfiles/ms/icons/green-dot.png' 

}); 


var infowindow2 = new google.maps.InfoWindow({ 
content: "Drop-Off Point" 
}); 



marker2.addListener('mouseover', function() { 
infowindow2.open(map, marker2); 
}); 
} 

google.maps.event.addListener(marker, 'dragend', function (event) { 
document.getElementById("fromlat").value = this.getPosition().lat(); 
document.getElementById("fromlng").value = this.getPosition().lng(); 
}); 

google.maps.event.addListener(marker2, 'dragend', function (event) { 
document.getElementById("tolat").value = this.getPosition().lat(); 
document.getElementById("tolng").value = this.getPosition().lng(); 
}); 
</script> 
<script async defer 
src="https://maps.googleapis.com/maps/api/js?key=*****&callback=initMap"> 
</script> 

</div> 

文本框：

enter code here 
<div class="row"> 
<div class="col-sm-3"> 
<fieldset> 
<input type="text" id="fromlat" name="fromlat" placeholder="Pickup Latitutde(Auto)"/> 
</fieldset> 
<fieldset> 
<input type="text" id="fromlng" name="fromlng" placeholder="Pickup Longitude(Auto)"/> 
</fieldset> 
</div> 
<div class="col-sm-3"> 
<fieldset> 
<input type="text" id="tolat" name="tolat" placeholder="Destination Latitude(Auto)"/> 
</fieldset> 
<fieldset> 
<input type="text" id="tolng" name="tolng" placeholder="Destination Longitude(Auto)"/> 
</fieldset> 
</div> 

Answer 1

你僅僅只需要定義您的活動功能在initMap（）函數下 這裏是腳本代碼。 請仔細閱讀

<script> 
var map; 
function initMap() { 
var cpe = {lat: -20.269401 , lng: 57.497840}; 
var pl = {lat: -20.187042 , lng: 57.498377}; 
map = new google.maps.Map(document.getElementById('map'), { 
zoom: 11, 
center: cpe 
}); 
var marker = new google.maps.Marker({ 
position: cpe, 
map:map, 
draggable:true, 
label: "P" 


}); 
var infowindow = new google.maps.InfoWindow({ 
content: "Pickup Point" 
}); 

marker.addListener('mouseover', function() { 
infowindow.open(map, marker); 
}); 

var marker2 = new google.maps.Marker({ 
position: pl, 
map:map, 
draggable:true, 
icon: 'http://maps.google.com/mapfiles/ms/icons/green-dot.png' 

}); 


var infowindow2 = new google.maps.InfoWindow({ 
content: "Drop-Off Point" 
}); 



marker2.addListener('mouseover', function() { 
infowindow2.open(map, marker2); 
}); 

google.maps.event.addDomListener(marker, 'dragend', function (event) { 
document.getElementById("fromlat").value = this.getPosition().lat(); 
document.getElementById("fromlng").value = this.getPosition().lng(); 
}); 

google.maps.event.addDomListener(marker2, 'drag', function (event) { 
document.getElementById("tolat").value = this.getPosition().lat(); 
document.getElementById("tolng").value = this.getPosition().lng(); 
}); 


} 
</script>