問題描述
我為 iPhone 創(chuàng)建了一個 PhoneGap 應(yīng)用，它通過 webview 中的 JavaScript 使用地理定位.
I created a PhoneGap app for iPhone that uses geolocation via JavaScript inside webview.
當(dāng)我第一次運(yùn)行該應(yīng)用程序時(shí)，它會提示我允許此應(yīng)用程序的地理定位.
When I run the app the first time, it'll prompt me to allow geolocation for this app.
當(dāng)我點(diǎn)擊ok"時(shí)，它會再次提示我同樣的問題，但這次它指出index.html"需要使用地理位置的權(quán)限.
When I hit "ok", it'll prompt me again with the same question but this time it states that "index.html" wants permission to use geolocation.
這是有道理的，因?yàn)?iOS 可能第一次需要允許應(yīng)用程序本身的地理定位權(quán)限，而瀏覽器第二次需要權(quán)限.
That makes sense because iOS probably wants permission to allow geolocation for the app itself for the first time and the 2nd time the browser wants permission.
但是，因?yàn)椴粫沓錾挠脩趔w驗(yàn):
However, since doesn't lead to a great user experience:
如何防止這種雙重提示?(如果可以防止第二個提示就足夠了)
How can I prevent this double prompt? (I'd be enough if the 2nd prompt could be prevented)
推薦答案
我找到了問題的原因.
對 navigator.geolocation.getCurrentPosition(onsuccess, onerror) 的調(diào)用發(fā)生在 Phonegap 完全加載之前.
The call to navigator.geolocation.getCurrentPosition(onsuccess, onerror) happens before Phonegap was fully loaded.
這意味著 webview 的地理定位調(diào)用(而不是通過 PhoneGap 的本地調(diào)用)被觸發(fā)，這將再次請求許可(這確實(shí)有意義).將其與智能手機(jī)上的普通 Safari 瀏覽器進(jìn)行比較.它會要求每個新網(wǎng)站的地理位置許可.應(yīng)用啟動時(shí)通過PhoneGap加載index.html也是一樣.
This means that the geolocation call of webview (and not a native call via PhoneGap) is being triggered which will again ask for permission (which does make sense). Compare it to the normal Safari browser on your Smartphone. It'll ask for geolocation permission for every new website. It's the same when loading index.html via PhoneGap on application startup.
但是，解決方案是等待在 PhoneGap 完全加載時(shí)觸發(fā)的 deviceready 事件:
However, the solution is to wait for the deviceready event which gets fired when PhoneGap has fully loaded:
document.addEventListener("deviceready", function(){
navigator.geolocation.getCurrentPosition(onsuccess, onerror, params);
}, false);
這將使 PhoneGap API 可用，它會覆蓋瀏覽器的默認(rèn) HTML5 地理定位調(diào)用，并通過本機(jī)調(diào)用(您已在第一個提示中接受)獲取設(shè)備的地理位置.
This will make the PhoneGap API available which overwrites the default HTML5 gelocation call of the browser and get the device's geo location via a native call (which you already accepted in the first prompt).
這會起作用，因?yàn)?PhoneGap 的 API 調(diào)用與 HTML5 的標(biāo)準(zhǔn) W3C 調(diào)用相同:http://docs.phonegap.com/en/2.2.0/cordova_geolocation_geolocation.md.html#Geolocation
This will work because PhoneGap's API calls are identical to the standard W3C call for HTML5: http://docs.phonegap.com/en/2.2.0/cordova_geolocation_geolocation.md.html#Geolocation
這篇關(guān)于如何防止 Phonegap 應(yīng)用程序中的地理定位雙重提示?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！