简介：本教程介绍如何在HTML的元素中利用JavaScript，在当前光标位置插入特定文本，并使光标自动跳转到文本区域的最后一处。 JS可以在TextArea的光标位置插入文字并移动光标到新插入的文字末尾。Firefox、Chrome、Safari以及Opera浏览器都支持使用selectionStart和selectionEnd属性来实现这一功能，感兴趣的朋友可以参考相关资料进行学习。 </p></div> </div> <div data-v-88f98792="" class="w-full p-5 mb-3 bg-white border border-gray-200 rounded-lg dark:bg-gray-800 dark:border-gray-700"> <div class="flex justify-center items-center mt-14 mb-7 text-gray-500 relative"><h2>全部评论 (<span>0</span>)</h2></div> <div class="w-full px-5 py-10 mb-3 bg-white border border-gray-200 rounded-lg dark:bg-gray-800 dark:border-gray-700"> <div class="flex items-center mt-10 mb-5 justify-center text-gray-400">还没有任何评论哟~</div> </div> </div> </div> <aside data-v-88f98792="" class="col-span-4 md:col-span-1 animate__animated animate__fadeInUp"> <div data-v-88f98792="" class="sticky top-[5.5rem]"> <div data-v-88f98792="" class="w-full py-5 px-2 mb-3 bg-white border border-gray-200 rounded-lg dark:bg-gray-800 dark:border-gray-700"> <div> <div class="flex 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0 0 40.96-40.96V419.84c0-1.62304-0.11776-3.21536-0.3072-4.79232a40.6528 40.6528 0 0 0 0.4096-5.44768zM578.56 252.48256L694.71744 368.64H578.56V252.48256zM271.36 829.44V194.56h225.28v215.04a40.96 40.96 0 0 0 40.96 40.96h215.04v378.88H271.36z" p-id="26447" fill="#707070"></path> <path data-v-abd0b829="" d="M371.2 660.48h133.12a40.96 40.96 0 0 0 0-81.92h-133.12a40.96 40.96 0 0 0 0 81.92zM650.24 696.32H363.52a40.96 40.96 0 0 0 0 81.92h286.72a40.96 40.96 0 0 0 0-81.92z" p-id="26448" fill="#707070"></path> </svg> </div> <div data-v-abd0b829="" class="col-start-2 p-1 col-end-8 items-center sm:flex text-base font-normal pt-1 text-gray-900 dark:text-white min-h-13 max-h-13 overflow-hidden"> <a data-v-abd0b829="" class="min-h-12 max-h-12 overflow-hidden ..." title="<span style=color: #f73131>在</span><span style=color: #f73131>TextArea</span><span style=color: #f73131>中</span><span style=color: #f73131>使</span><span style=color: #f73131>用</span><span style=color: #f73131>JS</span><span style=color: #f73131>于</span><span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span><span style=color: #f73131>插</span><span style=color: #f73131>入</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span><span style=color: #f73131>并</span><span style=color: #f73131>自</span><span style=color: #f73131>动</span><span style=color: #f73131>移</span><span style=color: #f73131>至</span><span style=color: #f73131>文</span><span style=color: #f73131>末</span>" href="https://d.itadn.com/i0_47818130092/B/768894" target="_blank"><span style=color: #f73131>在</span><span style=color: #f73131>TextArea</span><span style=color: #f73131>中</span><span style=color: #f73131>使</span><span style=color: #f73131>用</span><span style=color: #f73131>JS</span><span style=color: #f73131>于</span><span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span><span style=color: #f73131>插</span><span style=color: #f73131>入</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span><span style=color: #f73131>并</span><span style=color: #f73131>自</span><span style=color: #f73131>动</span><span style=color: #f73131>移</span><span style=color: #f73131>至</span><span style=color: #f73131>文</span><span style=color: #f73131>末</span></a> </div> <div data-v-abd0b829="" class="col-start-9 col-end-10" style="float: left;"><span data-v-abd0b829="" class="onestyle">优质</span></div> <div data-v-abd0b829="" class="col-start-2 col-end-9 p-1 text-gray-500 text-xs font-normal dark:text-white"> <div data-v-abd0b829="" class="min-h-8 max-h-8 overflow-hidden ..."> 本教程介绍如何在HTML的<textarea>元素中利用JavaScript，在当前光标位置插入特定文本，并使光标自动跳转到文本区域的最后一处。 JS可以在TextArea的光标位置插入文字并移动光标到新插入的文字末尾。Firefox、Chrome、Safari以及Opera浏览器都支持使用selectionStart和selectionEnd属性来实现这一功能，感兴趣的朋友可以参考相关资料进行学习。 </div><!----> </div> </li> <li data-v-abd0b829="" class="border-solid border-2 border-gray-300 dark:border-gray-600 grid auto-rows-min grid-cols-9 hover:bg-gray-100 hover:rounded-lg dark:hover:bg-gray-700 listyle" style="cursor: pointer;"> <div data-v-abd0b829="" class="col-start-1 pt-1 col-end-2 row-span-2 place-self-center imgsize"> <svg data-v-abd0b829="" t="1721980773527" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="26446" width="55" height="110"> <path data-v-abd0b829="" d="M834.6624 409.6a40.8576 40.8576 0 0 0-13.7728-30.63808l-254.32064-254.32064a40.87296 40.87296 0 0 0-31.1552-11.84768c-0.97792-0.07168-1.9456-0.1536-2.93376-0.1536H230.4a40.96 40.96 0 0 0-40.96 40.96v716.8a40.96 40.96 0 0 0 40.96 40.96h563.2a40.96 40.96 0 0 0 40.96-40.96V419.84c0-1.62304-0.11776-3.21536-0.3072-4.79232a40.6528 40.6528 0 0 0 0.4096-5.44768zM578.56 252.48256L694.71744 368.64H578.56V252.48256zM271.36 829.44V194.56h225.28v215.04a40.96 40.96 0 0 0 40.96 40.96h215.04v378.88H271.36z" p-id="26447" fill="#707070"></path> <path data-v-abd0b829="" d="M371.2 660.48h133.12a40.96 40.96 0 0 0 0-81.92h-133.12a40.96 40.96 0 0 0 0 81.92zM650.24 696.32H363.52a40.96 40.96 0 0 0 0 81.92h286.72a40.96 40.96 0 0 0 0-81.92z" p-id="26448" fill="#707070"></path> </svg> </div> <div data-v-abd0b829="" class="col-start-2 p-1 col-end-8 items-center sm:flex text-base font-normal pt-1 text-gray-900 dark:text-white min-h-13 max-h-13 overflow-hidden"> <a data-v-abd0b829="" class="min-h-12 max-h-12 overflow-hidden ..." title="Vue<span style=color: #f73131>中</span>获取<<span style=color: #f73131>textarea</span>><span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span>的方法.<span style=color: #f73131>js</span>" href="https://d.itadn.com/i0_79002234306/B/673953" target="_blank">Vue<span style=color: #f73131>中</span>获取<<span style=color: #f73131>textarea</span>><span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span>的方法.<span style=color: #f73131>js</span></a> </div> <div data-v-abd0b829="" class="col-start-9 col-end-10" style="float: left;"><span data-v-abd0b829="" class="onestyle">优质</span></div> <div data-v-abd0b829="" class="col-start-2 col-end-9 p-1 text-gray-500 text-xs font-normal dark:text-white"> <div data-v-abd0b829="" class="min-h-8 max-h-8 overflow-hidden ..."> 本文章介绍了在使用Vue框架开发过程中如何获取<textarea>元素内的光标当前位置的具体方法和实现代码。 在使用Vue进行开发时，可以通过获取当前光标位置来实现插值操作。首先需要确定光标的所在位置，然后截取光标前后的字符串，并对新字符进行插入处理。这样可以确保新的内容准确地出现在指定的位置上。 </div><!----> </div> </li> <li data-v-abd0b829="" class="border-solid border-2 border-gray-300 dark:border-gray-600 grid auto-rows-min grid-cols-9 hover:bg-gray-100 hover:rounded-lg dark:hover:bg-gray-700 listyle" style="cursor: pointer;"> <div data-v-abd0b829="" class="col-start-1 pt-1 col-end-2 row-span-2 place-self-center imgsize"> <svg data-v-abd0b829="" t="1721980773527" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="26446" width="55" height="110"> <path data-v-abd0b829="" d="M834.6624 409.6a40.8576 40.8576 0 0 0-13.7728-30.63808l-254.32064-254.32064a40.87296 40.87296 0 0 0-31.1552-11.84768c-0.97792-0.07168-1.9456-0.1536-2.93376-0.1536H230.4a40.96 40.96 0 0 0-40.96 40.96v716.8a40.96 40.96 0 0 0 40.96 40.96h563.2a40.96 40.96 0 0 0 40.96-40.96V419.84c0-1.62304-0.11776-3.21536-0.3072-4.79232a40.6528 40.6528 0 0 0 0.4096-5.44768zM578.56 252.48256L694.71744 368.64H578.56V252.48256zM271.36 829.44V194.56h225.28v215.04a40.96 40.96 0 0 0 40.96 40.96h215.04v378.88H271.36z" p-id="26447" fill="#707070"></path> <path data-v-abd0b829="" d="M371.2 660.48h133.12a40.96 40.96 0 0 0 0-81.92h-133.12a40.96 40.96 0 0 0 0 81.92zM650.24 696.32H363.52a40.96 40.96 0 0 0 0 81.92h286.72a40.96 40.96 0 0 0 0-81.92z" p-id="26448" fill="#707070"></path> </svg> </div> <div data-v-abd0b829="" class="col-start-2 p-1 col-end-8 items-center sm:flex text-base font-normal pt-1 text-gray-900 dark:text-white min-h-13 max-h-13 overflow-hidden"> <a data-v-abd0b829="" class="min-h-12 max-h-12 overflow-hidden ..." title="<span style=color: #f73131>JS</span><span style=color: #f73131>中</span><span style=color: #f73131>在</span>可编辑DIV的<span style=color: #f73131>光</span><span style=color: #f73131>标</span>处<span style=color: #f73131>插</span><span style=color: #f73131>入</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span>.html" href="https://d.itadn.com/i0_51039004523/B/1307121" target="_blank"><span style=color: #f73131>JS</span><span style=color: #f73131>中</span><span style=color: #f73131>在</span>可编辑DIV的<span style=color: #f73131>光</span><span style=color: #f73131>标</span>处<span style=color: #f73131>插</span><span style=color: #f73131>入</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span>.html</a> </div> <div data-v-abd0b829="" class="col-start-9 col-end-10" style="float: left;"><span data-v-abd0b829="" class="onestyle">优质</span></div> <div data-v-abd0b829="" class="col-start-2 col-end-9 p-1 text-gray-500 text-xs font-normal dark:text-white"> <div data-v-abd0b829="" class="min-h-8 max-h-8 overflow-hidden ..."> 本HTML示例展示如何在JavaScript中于可编辑的DIV元素的当前光标位置插入特定文本，实现动态内容编辑功能。 主要是通过div的contenteditable属性实现可编辑状态，可以点击按钮在光标处插入字符。 </div><!----> </div> </li> <li data-v-abd0b829="" class="border-solid border-2 border-gray-300 dark:border-gray-600 grid auto-rows-min grid-cols-9 hover:bg-gray-100 hover:rounded-lg dark:hover:bg-gray-700 listyle" style="cursor: pointer;"> <div data-v-abd0b829="" class="col-start-1 pt-1 col-end-2 row-span-2 place-self-center imgsize"> <svg data-v-abd0b829="" t="1721980773527" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="26446" width="55" height="110"> <path data-v-abd0b829="" d="M834.6624 409.6a40.8576 40.8576 0 0 0-13.7728-30.63808l-254.32064-254.32064a40.87296 40.87296 0 0 0-31.1552-11.84768c-0.97792-0.07168-1.9456-0.1536-2.93376-0.1536H230.4a40.96 40.96 0 0 0-40.96 40.96v716.8a40.96 40.96 0 0 0 40.96 40.96h563.2a40.96 40.96 0 0 0 40.96-40.96V419.84c0-1.62304-0.11776-3.21536-0.3072-4.79232a40.6528 40.6528 0 0 0 0.4096-5.44768zM578.56 252.48256L694.71744 368.64H578.56V252.48256zM271.36 829.44V194.56h225.28v215.04a40.96 40.96 0 0 0 40.96 40.96h215.04v378.88H271.36z" p-id="26447" fill="#707070"></path> <path data-v-abd0b829="" d="M371.2 660.48h133.12a40.96 40.96 0 0 0 0-81.92h-133.12a40.96 40.96 0 0 0 0 81.92zM650.24 696.32H363.52a40.96 40.96 0 0 0 0 81.92h286.72a40.96 40.96 0 0 0 0-81.92z" p-id="26448" fill="#707070"></path> </svg> </div> <div data-v-abd0b829="" class="col-start-2 p-1 col-end-8 items-center sm:flex text-base font-normal pt-1 text-gray-900 dark:text-white min-h-13 max-h-13 overflow-hidden"> <a data-v-abd0b829="" class="min-h-12 max-h-12 overflow-hidden ..." title="<span style=color: #f73131>JS</span>获取<span style=color: #f73131>文</span><span style=color: #f73131>本</span>框<span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span>及选<span style=color: #f73131>中</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span>范围" href="https://d.itadn.com/i0_26355037733/B/191120" target="_blank"><span style=color: #f73131>JS</span>获取<span style=color: #f73131>文</span><span style=color: #f73131>本</span>框<span style=color: #f73131>光</span><span style=color: #f73131>标</span><span style=color: #f73131>位</span><span style=color: #f73131>置</span>及选<span style=color: #f73131>中</span><span style=color: #f73131>文</span><span style=color: #f73131>本</span>范围</a> </div> <div data-v-abd0b829="" class="col-start-9 col-end-10" style="float: left;"><span data-v-abd0b829="" class="onestyle">优质</span></div> <div data-v-abd0b829="" class="col-start-2 col-end-9 p-1 text-gray-500 text-xs font-normal dark:text-white"> <div data-v-abd0b829="" class="min-h-8 max-h-8 overflow-hidden ..."> 本文介绍了如何使用JavaScript获取网页文本框中当前光标的位置以及被选中的文本长度和起始位置的方法。 在JavaScript编程中，文本框（TextBox）是网页交互的重要元素之一，用户可以在其中输入文本内容。开发者有时需要获取或操作文本框中的焦点光标位置、选中起始位置、终止位置以及选定的内容，这对于实现诸如高亮显示、文本编辑和格式化等功能至关重要。 本段落将深入探讨这些概念，并提供兼容IE8的解决方案： 1. **焦点光标位置**：当用户在文本框中输入时，插入点的位置即为焦点所在。这有助于开发者判断当前用户的输入位置并进行相应的处理。 2. **选中起始位置**：这是被选择的文本块开始处字符的位置。例如，在“Hello, World!”中选择了“World”，则其起始位置是6。 3. **终止位置**：与上述相反，这指的是所选内容结束时的字符位置。“World”在前述例子中的终止位置为11。 4. **选择内容**：这是由选定范围定义的具体文本。例如，“Hello, World!”中选择了“World”，则该段落即为选择的内容。 JavaScript提供了以下方法来获取和操作这些信息： - 获取焦点光标的位置： ```javascript function getCursorPos(input) { if (input.selectionStart) { //现代浏览器支持此属性 return input.selectionStart; } else if (document.selection) { //IE8及更早版本使用这种方式 input.focus(); var r = document.selection.createRange(); if (!r) return 0; var re = input.createTextRange(), rc = re.duplicate(); re.moveToBookmark(r.getBookmark()); rc.setEndPoint(EndToStart,re); return rc.text.length; } } ``` 此函数首先检查`selectionStart`属性，这是现代浏览器支持的API。对于IE8及更早版本，则利用了`document.selection`和`TextRange`对象来获取光标位置。 - 获取选中起始与终止的位置： ```javascript function getSelectionRange(input) { if (input.selectionStart !== undefined && input.selectionEnd !== undefined) { return { start: input.selectionStart, end: input.selectionEnd }; } else if (document.selection) { //IE8及更早版本使用这种方式 input.focus(); var range = document.selection.createRange(); return { start : 0 - range.duplicate().moveStart(character,-input.value.length), end : range.endOffset }; } } ``` 此函数返回一个对象，包含了选中内容的起始和终止位置。 - 获取选定文本： ```javascript function getSelectedText(input) { if (input.selectionStart !== undefined) { return input.value.slice(input.selectionStart, input.selectionEnd); } else if (document.selection) { return document.selection.createRange().text; } } ``` 此函数返回选中的文本字符串。 这些方法在处理文本框的交互时非常实用，可以用于各种应用场景如输入验证、格式转换和实时搜索等。确保代码对不同浏览器具有兼容性非常重要，在提供的示例中考虑了IE8及更早版本的特性以保证广泛适用性。 </div><!----> </div> </li> <li data-v-abd0b829="" class="border-solid border-2 border-gray-300 dark:border-gray-600 grid auto-rows-min grid-cols-9 hover:bg-gray-100 hover:rounded-lg dark:hover:bg-gray-700 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data-v-abd0b829="" class="col-start-9 col-end-10" style="float: left;"><span data-v-abd0b829="" class="onestyle">优质</span></div> <div data-v-abd0b829="" class="col-start-2 col-end-9 p-1 text-gray-500 text-xs font-normal dark:text-white"> <div data-v-abd0b829="" class="min-h-8 max-h-8 overflow-hidden ..."> 本文介绍了在Python编程中如何灵活地控制和改变光标的当前位置的方法与技巧。通过学习这些方法，开发者可以更高效地实现特定的程序功能或优化用户界面交互体验。 以下展示了如何在Python中移动文件对象的光标位置： ```python x = open(1.txt, r) print(x.tell()) # 显示当前光标的位置 x.seek(3) print(x.tell()) # 默认从头开始，向后移动3个字符 x.seek(5, 1) print(x.tell()) # 从当前位置往后移动5个位置 x.seek(2, 2) print(x.tell()) # 从文件末尾向前移动2个字符 ``` 以上是介绍Python中调整光标位置的方法，希望能够帮助到大家。 </div><!----> </div> </li> </body> </html>
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