我正在尝试获取用户的当前城市以及点击时通过getCity函数传递的任何参数,但我对'x'变量未定义。这是代码..
<button onclick="getCity('burger')">burger</button>
<button onclick="getCity('steak')">steak</button>
<button onclick="getCity('taco')">taco</button>
<script type="text/javascript">
//get city
function getCity(x) {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPos);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
//get lat and long
function showPos(position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
//get address
var geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(lat, lng);
geocoder.geocode({
'location': latlng
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
//get city
if (results[0]) {
var city = results[0]['address_components'][2].long_name;
var x = x;
alert(x +" "+ city); // i'm getting undefined + currentcity
}
}
});
}
</script>
我得到了undefined + currentcity。如果我点击汉堡按钮,我怎么做到这样我得到汉堡+当前城市?
答案 0 :(得分:1)
你最后一句话
var x = x;
将未定义的x分配给x。两个“x”都是未定义的。
答案 1 :(得分:0)
要使脚本正常工作,您必须声明一个全局变量
<button onclick="getCity('burger')">burger</button>
<button onclick="getCity('steak')">steak</button>
<button onclick="getCity('taco')">taco</button>
<script type="text/javascript">
var food;
//get city
function getCity(x) {
if (navigator.geolocation) {
food = x;
navigator.geolocation.getCurrentPosition(showPos);
} else {
//x.innerHTML does not work because x is a string not an element
this.innerHTML = "Geolocation is not supported by this browser.";
}
}
//get lat and long
function showPos(position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
//get address
var geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(lat, lng);
geocoder.geocode({
'location': latlng
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
//get city
if (results[0]) {
var city = results[0]['address_components'][2].long_name;
var x = food;
alert(x +" "+ city);
}
}
});
}
</script>
另一种可能的解决方案是传递它以将x
传递给showPos
函数。
<button onclick="getCity('burger')">burger</button>
<button onclick="getCity('steak')">steak</button>
<button onclick="getCity('taco')">taco</button>
<script type="text/javascript">
//get city
function getCity(x) {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position){
showPos(position, x);
});
} else {
//x.innerHTML does not work because x is a string not an element
this.innerHTML = "Geolocation is not supported by this browser.";
}
}
//get lat and long
function showPos(position, x) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
//get address
var geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(lat, lng);
geocoder.geocode({
'location': latlng
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
//get city
if (results[0]) {
var city = results[0]['address_components'][2].long_name;
//var x = food; x is already a parameter of this function so don't declare it again
alert(x +" "+ city);
}
}
});
}
</script>