javascript - 我怎样才能隐藏一个
并让它只在一个 has focus?</h1> <div id="body"><p>I'm using the same editor as Stack Overflow and the HTML looks something like this with multiple editors on a page:</p> <pre><code><pagedown-admin id</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="2015-07-02T15:14:22.693">2015-07-02T15:14:22.693</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 1988 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"> </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/javascript" class="post-tag js-gps-track" title="show questions tagged 'javascript'" rel="tag">javascript</a><a href="/tags/html" class="post-tag js-gps-track" title="show questions tagged 'html'" rel="tag">html</a><a href="/tags/css" class="post-tag js-gps-track" title="show questions tagged 'css'" rel="tag">css</a><a href="/tags/pagedown" class="post-tag js-gps-track" title="show questions tagged 'pagedown'" rel="tag">pagedown</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=""> 5 回答 <span style="display:none;" itemprop="answerCount">5</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="2"> 2 </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>当你聚焦 textarea 时使用<strong>onfocus</strong>事件，当你失去焦点时使用<strong>onblur事件：</strong></p> <pre><code>function hideDiv(){ document.getElementById("divID").style.display = 'none'; } </code></pre> <p><a href="http://jsfiddle.net/8zm3rw7p/4/" rel="nofollow">http://jsfiddle.net/8zm3rw7p/4/</a></p> <p>更新：</p> <p><a href="http://jsfiddle.net/8zm3rw7p/9/" rel="nofollow">http://jsfiddle.net/8zm3rw7p/9/</a></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2015-07-02T15:22:19.333 回答</div> </div> </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="2"> 2 </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>您可以附加到本机事件处理程序，就像在这个<a href="https://stackoverflow.com/questions/13563258/blur-and-focus-event-in-native-javascript">问题</a>中完成的那样，并显示/隐藏菜单。</p> <p></p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>(function() { var elm = document.getElementById("textarea"); elm.addEventListener('blur', handler, false); elm.addEventListener('focus', handler, false); function handler(event) { if (event.type === "blur") { document.getElementById("menu").style.display = "none"; } else { document.getElementById("menu").style.display = ""; } } })();</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><pagedown-admin id="modal-data-solution-2"> <div id="menu" style="display: none"> <div> Menu </div> </div> <textarea id="textarea"> ABC </textarea> </pagedown-admin></code></pre> </div> </div> <p></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2015-07-02T15:26:10.063 回答</div> </div> </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="1"> 1 </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>使用提到的问题@AlejandroC 中的示例，这是一个可行的解决方案</p> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>(function() { document.getElementById('first').addEventListener('blur', handler, false); document.getElementById('first').addEventListener('focus', handler, false); document.getElementById('second').addEventListener('blur', handler, false); document.getElementById('second').addEventListener('focus', handler, false); function handler(event) { if (event.type === "blur") { document.getElementById(this.id+'Div').style.display="none"; } else { document.getElementById(this.id+'Div').style.display="block"; } } })();</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><pagedown-admin id="modal-data-solution-1"> <div> <div id='firstDiv' style='display:none'> Menu </div> </div> <textarea id='first'> ABC </textarea> </pagedown-admin> <pagedown-admin id="modal-data-solution-2"> <div> <div id='secondDiv' style='display:none'> Menu </div> </div> <textarea id='second'> ABC </textarea> </pagedown-admin></code></pre> </div> </div> <p></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2015-07-02T15:26:06.043 回答</div> </div> </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="1"> 1 </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>这是一个通用解决方案的示例，它将根据您的标记与多个菜单一起使用。JavaScript 可以改进，但它会给你一个想法，如何解决它。</p> <p><strong>HTML</strong></p> <pre><code><pagedown-admin> <div> <div class="off">Menu</div> </div> <textarea> ABC </textarea> </pagedown-admin> </code></pre> <p><strong>CSS</strong></p> <pre><code>.off { display: none; } </code></pre> <p><strong>JavaScript</strong></p> <pre><code>var tas = document.getElementsByTagName('textarea'); for (var i = 0, j = tas.length; i < j; ++i) { tas[i].onfocus = function() { var e = this.parentNode.firstElementChild.firstElementChild; e.classList.toggle('off'); } tas[i].onblur = function() { var e = this.parentNode.firstElementChild.firstElementChild; e.classList.toggle('off'); } } </code></pre> <p><strong>演示</strong></p> <p><a href="http://jsfiddle.net/10qs8Ln7/" rel="nofollow">先试后买</a></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2015-07-02T15:33:56.117 回答</div> </div> </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="1"> 1 </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>如果结构始终相同，则可以使用此方法提高效率。</p> <p>使用选择所有菜单，然后<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for" rel="nofollow">循环</a><a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelectorAll" rel="nofollow"><code>Document.querySelectorAll()</code></a>遍历它们。<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for" rel="nofollow"><code>for()</code></a></p> <p>在每次迭代中，设置<code>display: none</code>为隐藏元素，然后将<a href="https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onfocus" rel="nofollow"><code>onfocus</code></a>事件处理程序和<a href="https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onblur" rel="nofollow"><code>onblur</code></a>事件处理程序附加到其<a href="https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode/nextElementSibling" rel="nofollow"><code>nextElementSibling</code></a>.</p> <p>在<code>onfocus</code>事件处理程序中，<code>display</code>从焦点元素的<a href="https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode/previousElementSibling" rel="nofollow"><code>previousElementSibling</code></a></p> <p>在<code>onblur</code>事件处理程序中，设置<code>display: none</code>焦点元素的<code>previousElementSibling</code></p> <hr> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>var menus = document.querySelectorAll('[id^=modal-data-solution] > div'), l = menus.length, i; for(i = 0; i < l; i++) { menus[i].style.display = "none"; menus[i].nextElementSibling.onfocus = handleFocus; menus[i].nextElementSibling.onblur = handleBlur; } function handleFocus() { this.previousElementSibling.style.display = ''; } function handleBlur() { this.previousElementSibling.style.display = 'none'; }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><pagedown-admin id="modal-data-solution-1" style="display: block;"> <div> <div> Menu </div> </div> <textarea> ABC </textarea> </pagedown-admin> <pagedown-admin id="modal-data-solution-2" style="display: block;"> <div> <div> Menu </div> </div> <textarea> ABC </textarea> </pagedown-admin></code></pre> </div> </div> <p></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2015-07-02T16:01:08.740 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/14557419" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/14557419" class="question-hyperlink">viewdidload - prepareForSegue 中的自定义对象与 viewDidLoad 不同</a> </div><div class="spacer"> <a href="/questions/14557428" title="Question score (upvotes - downvotes)"> <div 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