google-chrome - 访问 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">问问题</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">问问题</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 回答 <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" 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-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<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"> 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-gn8ppsfv"> <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> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>You could take the following approach:</p>

<ol>
<li>Use the <code>"all_frames":true</code> flag of <code>"content_scripts"</code> in the manifest file to execute the content script in all frames.</li>
<li>Bind a <code>message</code> event listener which performs the logic.</li>
<li>Bind an event listener for the trigger in question.</li>
<li><p>Whenever the event in step 3 is fired, use <code>if (top === window)</code> to determine whether the we're inside the top window.</p>

<ul>
<li>If yes, we're done.</li>
<li>If not, use <code>parent.postMessage({currentTotal: ... }, '');</code> to pass data to the parent frame. The <code>message</code> event listener from step two should detect this event, process it, and repeat step three.</li>
</ul></li>
</ol>

<p>I've explained how to approach the problem. One more useful code snippet: You need to identify the source frame. To achieve that, we use the <code>contentWindow</code> property of an <code><iframe></code> object for comparison with the <code>source</code> property of the event object:</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>With these hints you should be able to write the full code yourself. To measure offsets, use the <a href="https://developer.mozilla.org/en-US/docs/DOM/element.getBoundingClientRect" rel="nofollow"><code>getBoundingClientRect</code></a> method. For completeness, I also include links to other relevant documentation: <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">Content scripts (manifest)</a>.</p>
 </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2012-10-15T21:10:05.327 回答</div> </div> </div> </div> </div></div> </div> <div id="sidebar" class="show-votes" role="complementary" aria-label="sidebar"> <div class="module sidebar-related"> <h4 id="h-related">Related</h4> <div class="related js-gps-related-questions" data-tracker="rq=1"> <div class="spacer"> <a href="/questions/10443894" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443894" class="question-hyperlink">qt - 如何将 QGraphicsScene/View 设置为特定坐标系</a> </div><div class="spacer"> <a href="/questions/10443895" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">3</div> </a> <a href="/questions/10443895" class="question-hyperlink">android - Android 4.0 内存问题</a> </div><div class="spacer"> <a href="/questions/10443899" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443899" class="question-hyperlink">windows-phone-7 - 广告提供商与 PhoneGap 应用程序的集成</a> </div><div class="spacer"> <a href="/questions/10443908" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443908" class="question-hyperlink">asp.net - 日期时间（月+年）与字符串比较</a> </div><div class="spacer"> <a href="/questions/10443910" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">2</div> </a> <a href="/questions/10443910" class="question-hyperlink">php - 如何使用 mysql_auth_module 注销？</a> </div><div class="spacer"> <a href="/questions/10443911" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443911" class="question-hyperlink">sql-server-2005 - COALESCE 在 SQL SERVER 中做了什么</a> </div><div class="spacer"> <a href="/questions/10443913" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443913" class="question-hyperlink">git - 使更改在 master 和 branch 中都有效</a> </div><div class="spacer"> <a href="/questions/10443918" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443918" class="question-hyperlink">header-files - MPLab C18 v3.41 头文件</a> </div><div class="spacer"> <a href="/questions/10443931" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/10443931" class="question-hyperlink">performance - 大提交与小提交的 Git 性能</a> </div><div class="spacer"> <a href="/questions/10443932" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">6</div> </a> <a href="/questions/10443932" class="question-hyperlink">ios - 我可以使用 Interface Builder 构建 RubyMotion 应用程序吗？</a> </div> </div> </div> <div class="module js-gps-related-tags" id="related-tags"> <h4 id="h-related-tags">Reference</h4> <div data-name="javascript"> <a href="https://php.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">php</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">1429865</span> </span> </div> <div data-name="javascript"> <a href="https://c-cpp.com" class="post-tag no-tag-menu js-gps-track" target="_blank">c/c++</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">756500</span> </span> </div> <div data-name="javascript"> <a href="https://nginx.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">nginx</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49975</span> </span> </div> <div data-name="javascript"> <a href="https://mongodb.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">mongodb</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">159057</span> </span> </div> <div data-name="javascript"> <a href="https://mybatis.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">mybatis</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">3233</span> </span> </div> <div data-name="javascript"> <a href="https://anaconda.org.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">anaconda</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">13410</span> </span> </div> <div data-name="javascript"> <a href="https://pycharm.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">pycharm</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">14671</span> </span> </div> <div data-name="javascript"> <a href="https://python.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">python</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">1902243</span> </span> </div> <div data-name="javascript"> <a href="https://vscode.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">vscode</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">56040</span> </span> </div> <div data-name="javascript"> <a href="https://dockerdocs.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">docker</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">110988</span> </span> </div> <div data-name="javascript"> <a href="https://github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">github</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49000</span> </span> </div> <div data-name="javascript"> <a href="https://flask.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">flask</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49129</span> </span> </div> <div data-name="javascript"> <a href="https://ffmpeg.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">ffmpeg</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">24037</span> </span> </div> <div data-name="javascript"> <a href="https://jmeter.net" class="post-tag no-tag-menu js-gps-track" target="_blank">jmeter</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">16910</span> </span> </div> <div data-name="javascript"> <a href="https://matplotlib.net" class="post-tag no-tag-menu js-gps-track" target="_blank">matplotlib</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">63493</span> </span> </div> <div data-name="javascript"> <a href="https://getbootstrap.net" class="post-tag no-tag-menu js-gps-track" target="_blank">bootstrap</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">54641</span> </span> </div> </div> </div> </div> </div> </div> </div> <footer id="footer" class="site-footer js-footer" role="contentinfo"> <div class="site-footer--container"> <div class="site-footer--logo"> <a href="https://stackoverflow.com"><svg aria-hidden="true" class="native svg-icon iconLogoGlyphMd" width="32" height="37" viewBox="0 0 32 37"><path d="M26 33v-9h4v13H0V24h4v9h22Z" fill="#BCBBBB"/><path d="m21.5 0-2.7 2 9.9 13.3 2.7-2L21.5 0ZM26 18.4 13.3 7.8l2.1-2.5 12.7 10.6-2.1 2.5ZM9.1 15.2l15 7 1.4-3-15-7-1.4 3Zm14 10.79.68-2.95-16.1-3.35L7 23l16.1 2.99ZM23 30H7v-3h16v3Z" fill="#F48024"/></svg></a> </div> <nav class="site-footer--nav"> <div class="site-footer--col"> <h5 class="-title"><a href="https://stackoverflow.org.cn" class="js-gps-track" data-gps-track="footer.click({ location: 3, link: 15})">Stack Overflow 中文网</a></h5> <p>遵从 CC BY-SA 知识共享许可协议。</p> </div> </nav> </div> </footer> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?709ff2ad9744e86b5b0eee677fc13ede"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script>  <script async src="https://www.googletagmanager.com/gtag/js?id=G-1MW5BV8G8E"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-1MW5BV8G8E'); </script> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-6117966252207595" crossorigin="anonymous"></script> </body> </html>