有没有办法检查地理位置是否已被 Javascript 拒绝？
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Is there a way to check if geolocation has been DECLINED with Javascript?
提问by craigmoliver
I need JavaScript to display a manual entry if geolocation is declined.
如果地理位置被拒绝，我需要 JavaScript 来显示手动输入。
What I have tried:
我尝试过的：
Modernizr.geolocation
navigator.geolocation
Neither describes if user has previously declined access to geolocation.
两者都没有描述用户之前是否拒绝访问地理位置。
回答by Cristian Sanchez
watchPositionand getCurrentPositionboth accept a second callback which is invoked when there is an error. The error callback provides an argument for an error object. For permission denied, error.codewould be error.PERMISSION_DENIED(numeric value 1).
watchPosition并且getCurrentPosition都接受在出现错误时调用的第二个回调。错误回调为错误对象提供了一个参数。对于被拒绝的权限，error.code将是error.PERMISSION_DENIED（数值1）。
Read more here: https://developer.mozilla.org/en/Using_geolocation
在此处阅读更多信息：https: //developer.mozilla.org/en/Using_geolocation
Example:
例子：
navigator.geolocation.watchPosition(function(position) {
console.log("i'm tracking you!");
},
function(error) {
if (error.code == error.PERMISSION_DENIED)
console.log("you denied me :-(");
});EDIT: As @Ian Devlin pointed out, it doesn't seem Firefox (4.0.1 at the time of this post) supports this behavior. It works as expected in Chrome and probablySafari etc.
编辑：正如@Ian Devlin 所指出的，Firefox（本文发布时为 4.0.1）似乎不支持这种行为。它将按预期在Chrome和可能Safari浏览器等。
回答by Endless
With the new permission api this is available as such:
使用新的权限 api，可以这样使用：
navigator.permissions.query({ name: 'geolocation' })
.then(console.log)(only works for Blink & Firefox)
（仅适用于 Blink 和 Firefox）
回答by Josh Leitzel
According to the W3C geolocation specification, your getCurrentPositioncall can return a callback for success and a callback for failure. However, your failure callback will be invoked for anyerror that occurred, which is one of: (0) unknown; (1) permission denied; (2) position unavailable; or (3) timeout. [Source: Mozilla]
根据 W3C地理定位规范，您的getCurrentPosition调用可以返回成功回调和失败回调。但是，您的失败回调将针对发生的任何错误调用，这是以下之一：(0) 未知；(1) 许可被拒绝；(2) 职位不可用；或 (3) 超时。[来源：Mozilla]
In your case you want to do something specific if the user has explictly denied access. You can check the error.codevalue in your failure callback, like so:
在您的情况下，如果用户明确拒绝访问，您想要做一些特定的事情。您可以检查error.code失败回调中的值，如下所示：
navigator.geolocation.getCurrentPosition(successCallback,
errorCallback,
{
maximumAge: Infinity,
timeout:0
}
);
function errorCallback(error) {
if (error.code == error.PERMISSION_DENIED) {
// pop up dialog asking for location
}
}
回答by Kamae
To fix the Firefox problem is really easy. In my case I save the geolocation in a global variable on Javascript called geolocation. Before use this variable, I just check if is not undefined, if so I just get the geolocation from the IP.
修复 Firefox 问题真的很容易。在我的例子中，我将地理位置保存在 Javascript 上一个名为 geolocation 的全局变量中。在使用这个变量之前，我只检查是否未定义，如果是，我只是从 IP 获取地理位置。
In my website I don't have any problem getting the location the first time, but I saw in my short example that never has time to get the geolocation on the first time because is too quick.
在我的网站上，我第一次获取位置没有任何问题，但我在我的简短示例中看到，第一次获取地理位置的时间太快了。
Anyway this is just an example, you should adapt it in each case.
无论如何，这只是一个示例，您应该在每种情况下对其进行调整。
var geolocation = {};
getLocation();
$(document).ready(function(){
printLocation(); // First time, hasn't time to get the location
});
function printLocation(){
if(typeof geolocation.lat === "undefined" || typeof geolocation.long === "undefined"){
console.log("We cannot get the geolocation (too fast? user/browser blocked it?)");
// Get location by IP or simply do nothing
}
else{
console.log("LATITUDE => "+geolocation.lat);
console.log("LONGITUDE => "+geolocation.long);
}
}
function getLocation() {
// If the user allow us to get the location from the browser
if(window.location.protocol == "https:" && navigator.geolocation)
navigator.geolocation.getCurrentPosition(function(position){
geolocation["lat"] = position.coords.latitude;
geolocation["long"] = position.coords.longitude;
printLocation(); // Second time, will be return the location correctly
});
else{
// We cannot access to the geolocation
}
}
PS: I don't have enough reputation to comment the above answers so I had to create a new answer. Sorry about that.
PS：我没有足够的声誉来评论上述答案，所以我不得不创建一个新答案。对于那个很抱歉。
