Javascript-从嵌套函数返回值
我正在尝试从地址的lat和long值反向编码地址,并在引导模式中显示,因此我想用反向编码函数的结果更新变量“startAddress”,但我一直无法更新 这是模态函数:Javascript-从嵌套函数返回值,javascript,google-maps,geocode,Javascript,Google Maps,Geocode,我正在尝试从地址的lat和long值反向编码地址,并在引导模式中显示,因此我想用反向编码函数的结果更新变量“startAddress”,但我一直无法更新 这是模态函数: $(document).on("click", ".modal-editRoute", function () { var getCoord = $(this).attr("data"); var splitCoord = getCoord.split(
$(document).on("click", ".modal-editRoute", function () {
var getCoord = $(this).attr("data");
var splitCoord = getCoord.split(",");
var startAddress = getReverseGeocodingData(splitCoord[0], splitCoord[1]);
console.log("1: "+ startAddress); // This is undefined
$(".modal-body #startRoute").val(startAddress);
$(".modal-body #endRoute").val('coming soon');
});
function getReverseGeocodingData(lat, lng) {
var latlng = new google.maps.LatLng(lat, lng);
var geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'latLng': latlng }, function (results, status) {
if (status !== google.maps.GeocoderStatus.OK) {
alert(status);
}
if (status == google.maps.GeocoderStatus.OK) {
var result = (results[0].formatted_address);
}
console.log("2: "+result);
return result;
});
}
这是getReverseGeocodingData函数:
$(document).on("click", ".modal-editRoute", function () {
var getCoord = $(this).attr("data");
var splitCoord = getCoord.split(",");
var startAddress = getReverseGeocodingData(splitCoord[0], splitCoord[1]);
console.log("1: "+ startAddress); // This is undefined
$(".modal-body #startRoute").val(startAddress);
$(".modal-body #endRoute").val('coming soon');
});
function getReverseGeocodingData(lat, lng) {
var latlng = new google.maps.LatLng(lat, lng);
var geocoder = new google.maps.Geocoder();
geocoder.geocode({ 'latLng': latlng }, function (results, status) {
if (status !== google.maps.GeocoderStatus.OK) {
alert(status);
}
if (status == google.maps.GeocoderStatus.OK) {
var result = (results[0].formatted_address);
}
console.log("2: "+result);
return result;
});
}
以下是它在控制台日志中的显示方式:
你可以使用承诺:
function getReverseGeocodingData(lat, lng) {
var latlng = new google.maps.LatLng(lat, lng);
var geocoder = new google.maps.Geocoder();
return new Promise((resolve, reject) => {
geocoder.geocode({ 'latLng': latlng }, function (results, status) {
if (status !== google.maps.GeocoderStatus.OK) {
alert(status);
}
if (status == google.maps.GeocoderStatus.OK) {
var result = (results[0].formatted_address);
startAddress = result;
}
console.log("2: "+startAddress); // This has the proper value
resolve(startAddress);
});
});
}
$(document).on("click", ".modal-editRoute", function () {
var getCoord = $(this).attr("data");
var splitCoord = getCoord.split(",");
getReverseGeocodingData(splitCoord[0], splitCoord[1])
.then((startAddress) => {
console.log("1: "+ startAddress); // This is empty
$(".modal-body #startRoute").val(startAddress);
$(".modal-body #endRoute").val('coming soon');
});
});
要了解更多关于承诺的信息,您可以阅读以下帖子: