How Can I Get the Caret Position and Surrounding Text in a Textarea?

Obtaining Caret Position in a Textarea

Determining the caret position within a element is crucial for various text editing operations. In JavaScript, there are distinct approaches to achieve this depending on the browser used.</p> <p>For modern browsers like Firefox and Safari that support the selectionStart property, obtaining the caret's column position is straightforward:</p> <pre class="brush:php;toolbar:false">function getCaretColumn(textarea) { return textarea.selectionStart; }</pre> <p>However, in IE and legacy browsers, this property is unavailable, necessitating a more complex solution:</p> <pre class="brush:php;toolbar:false">function getCaretColumnIE(textarea) { var caret = document.selection.createRange(); var length = 0; var dul = caret.duplicate(); dul.moveToElementText(textarea); sel.text = '<pre class="brush:php;toolbar:false">function getSurroundingStrings(textarea) { var start = textarea.selectionStart; var end = textarea.selectionEnd; return [ textarea.value.slice(0, start), textarea.value.slice(start, end), textarea.value.slice(end) ]; }</pre>1'; length = dul.text.indexOf('1'); sel.moveStart('character', -1); sel.text = ""; return length; }</pre> <p><strong>Getting Strings Surrounding the Cursor</strong></p> <p>To retrieve the strings surrounding the cursor or selection, we can use a combination of getting the start and end caret positions, along with slicing the textarea's value:</p> <p>In cases where a word or text is highlighted, this function would return the strings before, within, and after the selection.</p><p>The above is the detailed content of How Can I Get the Caret Position and Surrounding Text in a Textarea?. For more information, please follow other related articles on the PHP Chinese website!</p></div><div class="nphpQianMsg"><a href="javascript:void(0);">JavaScript</a> <a href="javascript:void(0);">firefox</a> <a href="javascript:void(0);">safari</a> <a href="javascript:void(0);">for</a> <a href="javascript:void(0);">Property</a> <a href="javascript:void(0);">function</a> <a href="javascript:void(0);">this</a> <a href="javascript:void(0);">position</a> <a href="javascript:void(0);">column</a> <a href="javascript:void(0);">word</a><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn</div></div></div><div class="nphpSytBox"><span>Previous article：<a class="dBlack" title="Why Do My React Router URLs Break on Refresh or Direct Entry?" href="https://m.php.cn/faq/1796730700.html">Why Do My React Router URLs Break on Refresh or Direct Entry?</a></span><span>Next article：<a class="dBlack" title="Why Do My React Router URLs Break on Refresh or Direct Entry?" href="https://m.php.cn/faq/1796730708.html">Why Do My React Router URLs Break on Refresh or Direct Entry?</a></span></div><div class="nphpSytBox2"><div class="nphpZbktTitle"><h2>Related articles</h2><em><a href="https://m.php.cn/article.html" class="bBlack"><i>See more</i><b></b></a></em><div class="clear"></div></div><ins class="adsbygoogle" style="display:block" data-ad-format="fluid" data-ad-layout-key="-6t+ed+2i-1n-4w" data-ad-client="ca-pub-5902227090019525" data-ad-slot="8966999616"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); </script><ul class="nphpXgwzList"><li><b></b><a href="https://m.php.cn/faq/1609.html" title="An in-depth analysis of the Bootstrap list group component" class="aBlack">An in-depth analysis of the Bootstrap list group component</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/1640.html" title="Detailed explanation of JavaScript function currying" class="aBlack">Detailed explanation of JavaScript function currying</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/1949.html" title="Complete example of JS password generation and strength detection (with demo source code download)" class="aBlack">Complete example of JS password generation and strength detection (with demo source code download)</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/2248.html" title="Angularjs integrates WeChat UI (weui)" class="aBlack">Angularjs integrates WeChat UI (weui)</a><div class="clear"></div></li><li><b></b><a href="https://m.php.cn/faq/2351.html" title="How to quickly switch between Traditional Chinese and Simplified Chinese with JavaScript and the trick for websites to support switching between Simplified and Traditional Chinese_javascript skills" class="aBlack">How to quickly switch between Traditional Chinese and Simplified Chinese with JavaScript and the trick for websites to support switching between Simplified and Traditional Chinese_javascript skills</a><div class="clear"></div></li></ul></div></div><ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-5902227090019525" data-ad-slot="5027754603"></ins><script> (adsbygoogle = window.adsbygoogle || []).push({}); </script><footer><div class="footer"><div class="footertop"><img src="/static/imghwm/logo.png" alt=""><p>Public welfare online PHP training，Help PHP learners grow quickly！</p></div><div class="footermid"><a href="https://m.php.cn/about/us.html">About us</a><a href="https://m.php.cn/about/disclaimer.html">Disclaimer</a><a href="https://m.php.cn/update/article_0_1.html">Sitemap</a></div><div class="footerbottom"><p> © php.cn All rights reserved </p></div></div></footer><script>isLogin = 0;</script><script type="text/javascript" src="/static/layui/layui.js"></script><script type="text/javascript" src="/static/js/global.js?4.9.47"></script></div><script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script><link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css' type='text/css' media='all'/><script type='text/javascript' src='/static/js/viewer.min.js?1'></script><script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script><script>jQuery.fn.wait = function (func, times, interval) { var _times = times || -1, //100次 _interval = interval || 20, //20毫秒每次 _self = this, _selector = this.selector, //选择器 _iIntervalID; //定时器id if( this.length ){ //如果已经获取到了，就直接执行函数 func && func.call(this); } else { _iIntervalID = setInterval(function() { if(!_times) { //是0就退出 clearInterval(_iIntervalID); } _times <= 0 || _times--; //如果是正数就 -- _self = $(_selector); //再次选择 if( _self.length ) { //判断是否取到 func && func.call(_self); clearInterval(_iIntervalID); } }, _interval); } return this; } $("table.syntaxhighlighter").wait(function() { $('table.syntaxhighlighter').append("<p class='cnblogs_code_footer'><span class='cnblogs_code_footer_icon'></span></p>"); }); $(document).on("click", ".cnblogs_code_footer",function(){ $(this).parents('table.syntaxhighlighter').css('display','inline-table');$(this).hide(); }); $('.nphpQianCont').viewer({navbar:true,title:false,toolbar:false,movable:false,viewed:function(){$('img').click(function(){$('.viewer-close').trigger('click');});}}); </script></body><!-- Matomo --><script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '9']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script><!-- End Matomo Code --></html>