google-chrome - アクセスする upon an event in the iframe - with a chrome extension</a></h1> <div class="ml12 aside-cta flex--item print:d-none sm:ml0 sm:mb12 sm:order-first sm:as-end"> <a href="https://stackoverflow.com/questions/ask" target="_blank" class="ws-nowrap s-btn s-btnprimary">質問する</a></div> </div> <div class="d-flex fw-wrap pb8 mb16 bb bc-black-075"> <div class="flex--item ws-nowrap mr16 mb8"> <span class="fc-light mr2"></span> </div> <div class="flex--item ws-nowrap mr16 mb8" title="2022-04-17 15:46:40Z"> <span class="fc-light mr2">質問する</span> <time itemprop="dateCreated" datetime="2012-10-15T17:37:00.417">2012-10-15T17:37:00.417</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 1317 次 </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question" data-questionid="4" data-position-on-page="0" data-score="763" id="question"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="4"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-peeufs8c"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button> <div id="--stacks-s-tooltip-peeufs8c" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question shows research effort; it is useful and clear<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value=""> 0 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-04106eqn"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button><div id="--stacks-s-tooltip-04106eqn" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question does not show any research effort; it is unclear or not useful<div class="s-popover--arrow"></div></div> <div id="--stacks-s-tooltip-tgvwendx" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Bookmark this question.<div class="s-popover--arrow"></div></div> <a class="js-post-issue flex--item s-btn s-btnunset c-pointer py6 mx-auto" data-shortcut="T" data-ks-title="timeline" data-controller="s-tooltip" data-s-tooltip-placement="right" aria-label="Timeline" aria-describedby="--stacks-s-tooltip-abwmy15k"><svg aria-hidden="true" class="mln2 mr0 svg-icon iconHistory" width="19" height="18" viewBox="0 0 19 18"><path d="M3 9a8 8 0 1 1 3.73 6.77L8.2 14.3A6 6 0 1 0 5 9l3.01-.01-4 4-4-4h3L3 9Zm7-4h1.01L11 9.36l3.22 2.1-.6.93L10 10V5Z"></path></svg></a><div id="--stacks-s-tooltip-abwmy15k" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Show activity on this post.<div class="s-popover--arrow"></div></div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>Using an extension, I'd like to measure the offset of an iframe (relative to the top window) when a specific event happens in it.
This includes iframes of different origins.</p>

<p>It seems to require two things:</p>

<ol>
<li>catching the event in the iframe's own content-document</li>
<li>finding the iframe's corresponding DOM element (<code><iframe></code>) in its parent window and measuring its offset</li>
</ol>

<p>I can run a content-script in all iframes which would catch the specific event, but I fail to identify an iframe's corresponding DOM element in iframes with different origins, since in those cases I'm denied access to 'window.frameElement'.</p>

<p>Any ideas?
I could perhaps look for an element with an 'src' attribute corresponding to 'window.location.href' as seen in the context of the iframe's content-script, but 'window.location.href' wouldn't be a unique identifier... or would it?</p>
 </div> <div class="mt24 mb12"> <div class="post-taglist d-flex gs4 gsy fd-column"> <div class="d-flex ps-relative fw-wrap"> <a href="/tags/google-chrome" class="post-tag js-gps-track" title="show questions tagged 'google-chrome'" rel="tag">google-chrome</a><a href="/tags/iframe" class="post-tag js-gps-track" title="show questions tagged 'iframe'" rel="tag">iframe</a><a href="/tags/google-chrome-extension" class="post-tag js-gps-track" title="show questions tagged 'google-chrome-extension'" rel="tag">google-chrome-extension</a> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">4</span> </div> </div> <div class="js-zone-container zone-container-responsive"> <div id="dfp-isb" class="everyonelovesstackoverflow everyonelovesinline-sidebar mx-auto" style="min-height: auto; height: auto; display: none;"></div> <div class="js-report-ad-button-container mx-auto" style="width: 300px"></div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader d-flex ai-center mb8"> <div class="flex--item fl1"> <h2 class="mb0" data-answercount=""> 1 に答える <span style="display:none;" itemprop="answerCount">1</span> </h2> </div> </div> </div> <a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" 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<p>次のアプローチを取ることができます。</p> <ol> <li>すべてのフレームでコンテンツスクリプトを実行するには、マニフェストファイルで<code>"all_frames":true</code>フラグを使用します。<code>"content_scripts"</code></li> <li><code>message</code>ロジックを実行するイベントリスナーをバインドします。</li> <li>問題のトリガーのイベントリスナーをバインドします。</li> <li><p>手順 3 のイベントが発生するたびに、を使用<code>if (top === window)</code>して、トップウィンドウ内にいるかどうかを判断します。</p> <ul> <li>はいの場合、完了です。</li> <li>そうでない場合は、<code>parent.postMessage({currentTotal: ... }, '');</code>親フレームにデータを渡すために使用します。ステップ 2の<code>message</code>イベントリスナーは、このイベントを検出して処理し、ステップ 3 を繰り返す必要があります。</li> </ul></li> </ol> <p>問題へのアプローチ方法を説明しました。もう 1 つの便利なコードスニペット: ソースフレームを識別する必要があります。これを実現するために、イベントオブジェクトのプロパティとの比較にオブジェクトの<code>contentWindow</code>プロパティを使用します。<code><iframe></code><code>source</code></p> <pre><code>window.addEventListener('message', function(event) { if (top === window) { // do something with e.data } else { var iframes = document.getElementsByTagName('iframe'); for (var i=0; i<iframes.length; i++) { if (iframes[i].contentWindow === event.source) { // Found frame; measure offset, and pass data to parent frame var data = e.data; e.data += iframes[i].getBoundingClientRect().top; // example parent.postMessage({currentTotal: data}, ''); break; } } } }); </code></pre> <p>これらのヒントがあれば、完全なコードを自分で記述できるはずです。オフセットを測定するには、<a href="https://developer.mozilla.org/en-US/docs/DOM/element.getBoundingClientRect" rel="nofollow"><code>getBoundingClientRect</code></a>メソッドを使用します。完全を期すために、他の関連ドキュメントへのリンクも含めます: <a href="https://developer.mozilla.org/en-US/docs/DOM/window.postMessage" rel="nofollow"><code>window.postMessage</code></a>、<a href="http://developer.chrome.com/extensions/content_scripts.html#registration" rel="nofollow">コンテンツスクリプト (マニフェスト)</a>。</p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2012-10-15T21:10:05.327 に答える</div> </div> </div> </div> </div></div> </div> <div id="sidebar" class="show-votes" role="complementary" aria-label="sidebar"> <div class="module sidebar-related"> <h4 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