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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:43:23 -0500 |
commit | 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 (patch) | |
tree | a9ef8ac1e1b8fe4207b6d64d3841bfb8990b6fd0 /files/zh-tw/web/api/navigatoronline | |
parent | 074785cea106179cb3305637055ab0a009ca74f2 (diff) | |
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-rw-r--r-- | files/zh-tw/web/api/navigatoronline/online_and_offline_events/index.html | 101 |
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diff --git a/files/zh-tw/web/api/navigatoronline/index.html b/files/zh-tw/web/api/navigatoronline/index.html new file mode 100644 index 0000000000..6e6eafaa48 --- /dev/null +++ b/files/zh-tw/web/api/navigatoronline/index.html @@ -0,0 +1,129 @@ +--- +title: NavigatorOnLine +slug: Web/API/NavigatorOnLine +translation_of: Web/API/NavigatorOnLine +--- +<p>{{APIRef("HTML DOM")}}</p> + +<p>In progress The <code><strong>NavigatorOnLine</strong></code> interface contains methods and properties related to the connectivity status of the browser.</p> + +<p>There is no object of type <code>NavigatorOnLine</code>, but other interfaces, like {{domxref("Navigator")}} or {{domxref("WorkerNavigator")}}, implement it.</p> + +<h2 id="Properties">Properties</h2> + +<p><em>The <code>NavigatorOnLine</code></em><em> interface doesn't inherit any property.</em></p> + +<dl> + <dt>{{domxref("NavigatorOnLine.onLine")}} {{readonlyInline}}</dt> + <dd>Returns a {{domxref("Boolean")}} indicating whether the browser is working online.</dd> +</dl> + +<h2 id="Methods">Methods</h2> + +<p><em>The </em><em><code>NavigatorOnLine</code></em><em> interface neither implements, nor inherit any method.</em></p> + +<h2 id="Specifications">Specifications</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('HTML WHATWG', '#navigatoronline', 'NavigatorOnLine')}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td>No change from the latest snapshot, {{SpecName('HTML5 W3C')}}</td> + </tr> + <tr> + <td>{{SpecName('HTML5 W3C', '#navigatoronline', 'NavigatorOnLine')}}</td> + <td>{{Spec2('HTML5 W3C')}}</td> + <td>Snapshot of {{SpecName('HTML WHATWG')}} with its initial specification.</td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p>{{ CompatibilityTable() }}</p> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Edge</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + <tr> + <td>on {{domxref("WorkerNavigator")}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatGeckoDesktop(29)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Chrome for Android</th> + <th>Edge</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + <tr> + <td>on {{domxref("WorkerNavigator")}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatGeckoMobile(29)}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + <td>{{CompatUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<h2 id="See_also">See also</h2> + +<ul> + <li>The {{domxref("Navigator")}} interface that implements it.</li> + <li><a href="/en-US/docs/Web/API/NavigatorOnLine/Online_and_offline_events">Online and offline events</a></li> +</ul> diff --git a/files/zh-tw/web/api/navigatoronline/online_and_offline_events/index.html b/files/zh-tw/web/api/navigatoronline/online_and_offline_events/index.html new file mode 100644 index 0000000000..c8bf629d8c --- /dev/null +++ b/files/zh-tw/web/api/navigatoronline/online_and_offline_events/index.html @@ -0,0 +1,101 @@ +--- +title: Firefox 3 Online and Offline Events +slug: Web/API/NavigatorOnLine/Online_and_offline_events +translation_of: Web/API/NavigatorOnLine/Online_and_offline_events +--- +<p>Firefox 3 Online and Offline Events From MoztwWiki</p> +<p>Firefox 3 依據 <a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/">WHATWG Web Applications 1.0 Specification</a> 實做了 <a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/#offline">Offline/Online Events</a>。</p> +<h3 id=".E6.A6.82.E8.A7.80" name=".E6.A6.82.E8.A7.80">概觀</h3> +<p>打造可以離線跑的網路應用程式時,我們往往需要讓程式知道目前的網路狀況。實際上,網路應用程式一般的需求可細分如下:</p> +<ul> + <li>使用者連上網路的時候,網路應用程式必須知道—使用者已經連上網路了,以便與伺服器同步(re-synchronize)。</li> + <li>使用者離線的時候,網路應用程式必須知道—使用者目前處於離線狀態,以便將使用者對伺服器發出的 requests 排入隊列(queue)。</li> +</ul> +<p>有了 Online/offline events,要滿足這些需求變得很簡單。</p> +<p>此外,你的網路應用程式有時可能必須將某些 HTML 文件列入快取中,以便使用者離線時可以存取,如有這個需求,你可以在 HTML 文件的 <HEAD> 加入 <link> 元素:</p> +<pre><link rel="offline-resource" href="myresource"></pre> +<p>Firefox 3 看到這些語法時,就會將這些資源列入一個特殊的離線資源快取(offline resource cache)中,讓使用者在離線時,依舊可以被存取這些資源。</p> +<h3 id="API" name="API">API</h3> +<h4 id="navigator.onLine" name="navigator.onLine">navigator.onLine</h4> +<dl> + <dd> + avigator.onLine 是一個 property,其值可為 true/false (true 代表 online, false 代表 offline)。當使用者將瀏覽器切換成 Offline Mode 時(透過 主選單 -> 檔案 -> 離線模式),這個 property 就會被更新。</dd> +</dl> +<dl> + <dd> + 除此之外,根據規格書的建議,在瀏覽器無法連接到網路時,也應該更新這個 property。規格書上是這樣寫的:</dd> + <dd> + <blockquote> + The navigator.onLine attribute must return false if the user agent will not contact the network when the user follows links or when a script requests a remote page (or knows that such an attempt would fail)...</blockquote> + </dd> +</dl> +<dl> + <dd> + Firefox 2 在我們將瀏覽器切換成為離線模式、或離開離線模式時,會更新這個 property,在失去網路連線、或重新連線到網路時,也會更新這個 property。</dd> +</dl> +<dl> + <dd> + 在比較老的 Firefox 與 Internet Explorer 版本,也有支援這個 property (事實上,規格書是依據這些之前版本的實做結果來制定的),所以現在就可以馬上開始使用它。</dd> +</dl> +<dl> + <dd> + 但「自動偵測網路狀況」是在 Firefox 2 中才實做出來。</dd> +</dl> +<h4 id="online_and_offline_events" name="online_and_offline_events">online and offline events</h4> +<dl> + <dd> + Firefox 3 新增了兩個 events 的支援: "online" 及 "offline"。當我們切換瀏覽器的 online/offline 狀態時,就會對每個頁面的 <body> 觸發這兩個事件。除此之外,這兩個事件會從 document.body bubble up 到 document,到 window 才結束。這兩個事件都是 non-cancellable 的(因為你無法防止使用者連線到網路、或離線)。</dd> +</dl> +<dl> + <dd> + 有好幾種你熟悉的方式可以用來註冊這兩個事件的 listeners:</dd> +</dl> +<dl> + <dd> + <ul> + <li>對 window, document 或 document.body 使用 addEventListener。</li> + <li>對 document 或 document.body 設定 .ononline 或 .onoffline properties 作為一個 JavaScript Function object. (注意: 使用 window.ononline 或 window.onoffline 無法作用,這是為了相容性。)</li> + <li>在 html 文件的 <body> 指定 ononline="..." 或 onoffline="..." attributes。</li> + </ul> + </dd> +</dl> +<h3 id=".E4.BE.8B.E5.AD.90" name=".E4.BE.8B.E5.AD.90">例子</h3> +<p>這裡有個<a class="link-https" href="https://bugzilla.mozilla.org/attachment.cgi?id=220609">簡單的例子</a>。</p> +<pre><!doctype html> + <html> + <head> + <script> + function updateOnlineStatus(msg) { + var status = document.getElementById("status"); + var condition = navigator.onLine ? "ONLINE" : "OFFLINE"; + status.setAttribute("class", condition); + var state = document.getElementById("state"); + state.innerHTML = condition; + var log = document.getElementById("log"); + log.appendChild(document.createTextNode("Event: " + msg + "; status=" + condition + "\n")); + } + function loaded() { + updateOnlineStatus("load"); + document.body.addEventListener("offline", function () { + updateOnlineStatus("offline") + }, false); + document.body.addEventListener("online", function () { + updateOnlineStatus("online") + }, false); + } + </script> + <style>...</style> + </head> + <body onload="loaded()"> + <div id="status"><p id="state"></p></div> + <div id="log"></div> + </body> + </html></pre> +<h3 id=".E5.8F.83.E8.80.83.E8.B3.87.E6.96.99" name=".E5.8F.83.E8.80.83.E8.B3.87.E6.96.99">參考資料</h3> +<ul> + <li><a class="external" href="http://developer.mozilla.org/en/docs/Online_and_offline_events">Online and Offline Events 原始網頁</a></li> + <li><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/#offline">'Online/Offline events' section from the WHATWG Web Applications 1.0 Specification</a></li> + <li><a class="link-https" href="https://bugzilla.mozilla.org/show_bug.cgi?id=336359">The bug tracking online/offline events implementation in Firefox</a> and <a class="link-https" href="https://bugzilla.mozilla.org/show_bug.cgi?id=336682">Follow-up</a></li> + <li><a class="link-https" href="https://bugzilla.mozilla.org/attachment.cgi?id=220609">一個簡單的例子</a></li> + <li><a class="external" href="http://ejohn.org/blog/offline-events/">An explanation of Online/Offline events</a></li> +</ul> |