在JavaScript中通过地理编码Google-Api将地址添加到表中
在JavaScript中通过地理编码Google-Api将地址添加到表中
提问于 2019-05-14 06:34:57
我正在尝试制作家长控制系统，允许家长在WebService中跟踪其孩子的位置历史记录。
我有移动应用程序，发送位置到实时数据库在谷歌Firebase。这些位置(纬度和经度)从Firebase发送到我的Javascript代码，在那里我想将它们放到HTML中的一个表中。我不想把经度和纬度放到表中，但是我想保存基于这个位置的地址。这就是我使用Google地理定位API的原因。问题是，当我在想要放入表中的变量中设置此地址时，此变量似乎是未定义的。我认为这个变量的作用域可能有问题，但我不能处理这个问题。提前感谢您的帮助。我把我的JS代码放在下面：
var longitude;
var latitude;
var address;
//GETING DATA FROM FIREBASE
$(document).ready(function(){
var rootRef = firebase.database().ref().child("locations");
rootRef.on("child_added", snap => {
time = snap.child("time").val();
longitude = snap.child("longitude").val();
latitude = snap.child("latitude").val();
latitude = parseFloat(latitude);
longitude = parseFloat(longitude);
//CONVERTING LATITUDE AND LONGITUDE INTO ADDRESS
var geocoder = new google.maps.Geocoder();
var location = new google.maps.LatLng(latitude, longitude);
geocoder.geocode({'latLng': location}, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
address = results[0].formatted_address;
//HERE ADDRESS IS DISPLAYING GOOD
}
});
//PUT ADDRESS INTO TABLE (THERE IS PROBLEM - ADDRESS IS Undefined)
$("#table_body").append("<tr><td>" + time + "</td><td>" + address + "</td><td>");
})
})回答 2
Stack Overflow用户
发布于 2019-05-14 07:02:13
尝试将jQuery.append()移动到条件表达式中：
coder.geocode({'latLng': location}, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var tempAddress = results[0].formatted_address;
$("#table_body").append("<tr><td>" + time + "</td><td>" + tempAddress + "</td><td>");
}
});Stack Overflow用户
发布于 2019-05-15 02:29:56
地理编码器是异步的。当数据可用时，需要在回调函数中使用数据。如果你想在回调例程中使用循环变量，你需要用函数闭包来捕获它们：
var longitude;
var latitude;
var address;
//GETING DATA FROM FIREBASE
$(document).ready(function(){
var rootRef = firebase.database().ref().child("locations");
rootRef.on("child_added", snap => {
time = item.time;
longitude = item.longitude;
latitude = item.latitude;
latitude = parseFloat(latitude);
longitude = parseFloat(longitude);
//CONVERTING LATITUDE AND LONGITUDE INTO ADDRESS
var geocoder = new google.maps.Geocoder();
var location = new google.maps.LatLng(latitude, longitude);
geocoder.geocode({
'latLng': location
}, (function(time) { // function closure on the "time" variable
return function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
address = results[0].formatted_address;
//HERE ADDRESS IS DISPLAYING GOOD
//PUT ADDRESS INTO TABLE (THERE IS PROBLEM - ADDRESS IS Undefined)
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
bounds.extend(marker.getPosition());
map.fitBounds(bounds);
$("#table_body").append("<tr><td>" + time + "</td><td>" + address + "</td><td>");
}
}}(time)));
})
})
}
代码片段：
var testData = [{
time: "2019-01-01 12:00:00",
latitude: 40.7484405,
longitude: -73.9856644
},
{
time: "2019-01-01 12:10:00",
latitude: 40.6892494,
longitude: -74.0445004
}
]
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 8,
center: {
lat: -34.397,
lng: 150.644
}
});
var geocoder = new google.maps.Geocoder();
var longitude;
var latitude;
var address;
//GETING DATA FROM FIREBASE
$(document).ready(function() {
var bounds = new google.maps.LatLngBounds();
testData.forEach(function(item, i) {
time = item.time;
longitude = item.longitude;
latitude = item.latitude;
latitude = parseFloat(latitude);
longitude = parseFloat(longitude);
//CONVERTING LATITUDE AND LONGITUDE INTO ADDRESS
var geocoder = new google.maps.Geocoder();
var location = new google.maps.LatLng(latitude, longitude);
geocoder.geocode({
'latLng': location
}, (function(time) {
return function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
address = results[0].formatted_address;
//HERE ADDRESS IS DISPLAYING GOOD
//PUT ADDRESS INTO TABLE (THERE IS PROBLEM - ADDRESS IS Undefined)
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
bounds.extend(marker.getPosition());
map.fitBounds(bounds);
$("#table_body").append("<tr><td>" + time + "</td><td>" + address + "</td><td>");
}
}}(time)));
})
})
}
function geocodeAddress(geocoder, resultsMap) {
var address = document.getElementById('address').value;
geocoder.geocode({
'address': address
}, function(results, status) {
if (status === 'OK') {
resultsMap.setCenter(results[0].geometry.location);
var marker = new google.maps.Marker({
map: resultsMap,
position: results[0].geometry.location
});
} else {
alert('Geocode was not successful for the following reason: ' + status);
}
});
}#map {
height: 80%;
}
html,
body {
height: 100%;
margin: 0;
padding: 0;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="map"></div>
<div id="table">
<table id="table_body">
</table>
</div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"></script>
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56120680
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