我想要做的是确定用户的位置,然后根据他的位置向Yelp API发出请求。
function getLocation()
{
if (navigator.geolocation)
{
var y = navigator.geolocation.getCurrentPosition(showPosition);
return y;
}
else{x.innerHTML="Geolocation is not supported by this browser.";}
}
function showPosition(position)
{
var y = position.coords.latitude +
"," + position.coords.longitude;
return y;
}
function doRequest(){
var terms = 'turkish';
var near = 'San+Francisco';
var ll = getLocation();
... }
我测试了变量y,它给出了真实的纬度和经度,如果我在ll中写一个坐标,请求代码就可以了。
问题是,在这种情况下,我的ll参数似乎在请求中“未定义”,我无法从API接收任何响应。我不明白问题是什么。任何的想法?
答案 0 :(得分:2)
Geolocation API是异步的,因此您必须等待返回数据
function getLocation(callback) {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
callback({
success : true,
result : position.coords.latitude + "," + position.coords.longitude
});
});
} else {
callback({
success : false,
result : "Geolocation is not supported by this browser."
});
}
}
function doRequest() {
var terms = 'turkish';
var near = 'San+Francisco';
getLocation(function(result) {
if (result.success) {
var y = result.result;
// do something with y here
}else{
x.innerHTML = result.result;
}
});
}