Make a Colored Syntax Highlighter With the Copy Feature on Blogger

Table of Contents

Syntax Highlighter is a feature of several text editors that can display a source code in various colors to make it easier for users to sort the code written.

In a web page, Syntax Highlighter is usually found in a blog or website that discusses programming code. In the following article I will share how to make a colored syntax highlighter with the copy feature that will help blog visitors.

Installing Syntax Highlighter on Blogger

The first step, first delete the following code .post-body pre or .post-body code pre. Then add the following line of CSS code just below the code <style>

/* syntax highlighter */
.post-body pre{position:relative;width:100%;background-color:#262a2d;border-radius:4px;margin:25px auto;-moz-tab-size:2;-o-tab-size:2;tab-size:2;word-break:normal;user-select:text;-webkit-user-select:text;-khtml-user-select:text;-moz-user-select:text;-ms-user-select:text;user-select:text;-webkit-hyphens:none;-moz-hyphens:none;-ms-hyphens:none;hyphens:none}
.post-body pre code{color:rgba(255,255,255,.9);display:block;padding:20px;white-space:pre;font-family:monospace;font-size:14px;overflow-x:auto;line-height:1.5em}
.hljs,.hljs-subst,.hljs-tag{color:#eaebec}
.hljs-emphasis,.hljs-strong{color:#a8a8a2}
.hljs-bullet,.hljs-link,.hljs-literal,.hljs-number,.hljs-quote,.hljs-regexp{color:#ae81ff}
.hljs-code,.hljs-section,.hljs-selector-class,.hljs-title{color:#a6e22e}
.hljs-strong{font-weight:700}
.hljs-emphasis{font-style:italic}
.hljs-attr,.hljs-keyword,.hljs-name,.hljs-selector-tag{color:#f15a5a}
.hljs-attribute,.hljs-symbol{color:#66d9ef}
.hljs-class .hljs-title,.hljs-params{color:#f8f8f2}
.hljs-addition,.hljs-built_in,.hljs-builtin-name,.hljs-selector-attr,.hljs-selector-id,.hljs-selector-pseudo,.hljs-string,.hljs-template-variable,.hljs-type,.hljs-variable{color:#e6db74}
.hljs-comment,.hljs-deletion,.hljs-meta{color:#75715e}
.code-badge-copy-icon{background:url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M391.89,450H163a50.17,50.17,0,0,1-50.11-50.11V98.11A50.17,50.17,0,0,1,163,48h150.1a15,15,0,0,1,10.61,4.39L437.61,166.27A15,15,0,0,1,442,176.88v223A50.17,50.17,0,0,1,391.89,450ZM163,78a20.13,20.13,0,0,0-20.11,20.11V399.89A20.13,20.13,0,0,0,163,420H391.89A20.13,20.13,0,0,0,412,399.89V183.09L306.91,78Z' fill='%23c6c9ce'/%3E%3Cpath d='M427,191.88H348.23a50.17,50.17,0,0,1-50.11-50.11V63a15,15,0,0,1,30,0v78.77a20.13,20.13,0,0,0,20.11,20.11H427a15,15,0,0,1,0,30Z' fill='%23c6c9ce'/%3E%3C/svg%3E");background-size:55% 55%;background-repeat:no-repeat;background-position:center;cursor:pointer;padding:7px 15px;margin:-5px -8px -5px -14px}
.code-badge > .code-badge-check-icon{background:green}
.code-badge-check-icon{cursor:pointer;padding:0 7px;margin:-5px 0 -5px -5px;background:url('data:image/svg+xml;base64,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');background-size:100% 100%}
#copyy i.code-badge-copy-icon:before{content:'Copy Code';font-style:normal;position:absolute;display:block;top:-20px;width:max-content;background:rgba(0,0,0,.57);color:#fff;border-radius:3px;right:0;padding:2px 6px;visibility:hidden;opacity:0;transition:all .2s ease}
#copyy:hover i.code-badge-copy-icon::before{visibility:visible;opacity:1;top:-33px}
#copyy i.code-badge-copy-icon:after{content:'';position:absolute;top:0;right:13px;border-left:solid transparent 4px;border-right:solid transparent 4px;border-top:solid rgba(0,0,0,.57) 4px;opacity:0;visibility:hidden;transition:all .2s ease}
#copyy:hover i.code-badge-copy-icon::after{visibility:visible;opacity:1;top:-9.8px}
#copyy i.code-badge-check-icon:before{content:'Code Copied!';font-style:normal;position:absolute;display:block;top:-33px;width:max-content;background:rgba(0,0,0,.57);color:#fff;border-radius:3px;right:0;padding:2px 6px;transition:all .2s ease}
#copyy i.code-badge-check-icon:after{content:'';position:absolute;top:-9.8px;right:13px;border-left:solid transparent 4px;border-right:solid transparent 4px;border-top:solid rgba(0,0,0,.57) 4px;transition:all .2s ease}

The Syntax Highlighter in this article has a color sorter and copy code feature, so I added javascript to carry out its functions. For the color feature here, we have used a script that is already available on Github, namely the latest highlight.js v10.4.0.

Ways and steps to install the Syntax Highlighter on Blogger

Find the following code </body> then place the following javascript code right above it:

<b:if cond='data:view.isPost'>
<script>
//<![CDATA[
/* highlight.js badge */
"use strict";!function(e,o){"object"==typeof module&&"object"==typeof module.exports?module.exports=e.document?o(e):function(e){if(!e.document)throw new Error("A window with a document is required");return o(e)}:o(e)}("undefined"!=typeof window?window:this,function(y,e){var o;function t(e){var m={templateSelector:"#CodeBadgeTemplate",contentSelector:"body",loadDelay:0,copyIconClass:"fa fa-copy",copyIconContent:"",checkIconClass:"fa fa-check text-success",checkIconContent:"",onBeforeCodeCopied:null};function o(){m.loadDelay?setTimeout(t,loadDelay):t()}function t(){var e,o,t;document.querySelector(m.templateSelector)||((e=document.createElement("div")).innerHTML=function(){for(var e=["<style>","@media print {",".code-badge { display: none; }","}"," .dark-mode .code-badge {"," background: rgba(78,95,109,.10);"," }"," .code-badge-pre {"," position: relative;"," }"," .code-badge {"," display: flex;"," flex-direction: row;"," white-space: normal;"," background: rgba(88,101,111,.63);"," color: #333;"," font-size: 13px;"," line-hei
ght: 1.5em;"," opacity: 0.5;"," transition: opacity linear 0.5s;"," border-radius: 0 4px 0 4px;"," padding: 5px 8px 5px 8px;"," position: absolute;"," right: 0;"," top: 0;"," }"," .code-badge.active {"," opacity: 0.8;"," }",""," .code-badge:hover {"," opacity: .95;"," }",""," .code-badge a,"," .code-badge a:hover {"," text-decoration: none;"," }",""," .code-badge-language {"," margin-right: 10px;"," font-weight: 600;"," color: goldenrod;"," }"," .fa.text-success:{ color: limegreen !important }","</style>",'<div id="CodeBadgeTemplate" style="display:none">',' <div class="code-badge">',' <div class="code-badge-language" >{{language}}</div>',' <div id="copyy" title="Salin Code">',' <i class="{{copyIconClass}}"></i></i></a>'," </div>"," </div>","</div>"],o="",t=0;t<e.length;t++)o+=e[t]+"n";return o}(),o=e.querySelector("style"),t=e.querySelector(m.templateSelector),document.body.appendChild(o),document.body.appendChild(t));for(var n=document.querySelector(m.templateSelector).innerHTML,c=document.querySelectorAll("pre>code.hljs"),a=0;a<c.length;a++){var r=c[a];if(!r.querySelector(".code-badge")){for(var d="",l=0;l<r.classList.length;l++){var i=r.classList[l];if("language-"===i.substr(0,9)){d=r.classList[l].replace("language-","");break}if("lang-"===i.substr(0,5)){d=r.classList[l].replace("lang-","");break}if(!d)for(var s=0;s<r.classList.length;s++)if("hljs"!=r.classList[s]){d=r.classList[s];break}}"ps"==(d=d?d.toLowerCase():"text")?d="powershell":"cs"==d?d="csharp":"js"==d?d="javascript":"ts"==d?d="typescript":"fox"==d&&(d="foxpro");var p=n.replace("{{language}}",d).replace("{{copyIconClass}}",m.copyIconClass).trim(),u=document.createElement("div");u.innerHTML=p,u=u.querySelector(".code-badge");var g=r.parentElement;g.classList.add("code-badge-pre"),m.copyIconContent&&(u.querySelector(".code-badge-copy-icon").innerText=m.copyIconContent),g.insertBefore(u,r)}}document.querySelector(m.contentSelector).addEventListener("click",function(c){return c.srcElement.classList.contains("code-badge-copy-icon")&&(c.preventDefault(),c.cancelBubble=!0,function(){var e=c.srcElement.parentElement.parentElement.parentElement,o=e.querySelector("pre>code"),t=o.textContent||o.innerText;m.onBeforeCodeCopied&&(t=m.onBeforeCodeCopied(t,o));var n=document.createElement("textarea");n.value=t.trim(),document.body.appendChild(n),n.style.display="block",y.document.documentMode?n.setSelectionRange(0,n.value.length):n.select(),document.execCommand("copy"),document.body.removeChild(n),function(e){var o=m.copyIconClass.split(" "),t=m.checkIconClass.split(" "),n=e.querySelector(".code-badge-copy-icon");n.innerText=m.checkIconContent;for(var c=0;c<o.length;c++)n.classList.remove(o[c]);for(c=0;c<t.length;c++)n.classList.add(t[c]);setTimeout(function(){n.innerText=m.copyIconContent;for(var e=0;e<t.length;e++)n.classList.remove(t[e]);for(e=0;e<o.length;e++)n.classList.add(o[e])},2e3)}(e)}()),!1})}Object.assign(m,e),"loading"==document.readyState?document.addEventListener("DOMContentLoaded",o):o()}"boolean"!=typeof o&&(o=!1),y.highlightJsBadge=t,y.module&&y.module.exports&&(y.module.exports.highlightJsBadge=t),o&&t()});
/* Highlight.js */
document.addEventListener("DOMContentLoaded", (event) => {
 var pres = document.querySelectorAll("pre>code");
 for (var i = 0; i < pres.length; i++) {
 hljs.highlightBlock(pres[i]);
 }
 var options = {
 contentSelector: ".post-body",
 loadDelay:0,
 copyIconClass: "code-badge-copy-icon",
 checkIconClass: "code-badge-check-icon",
 onBeforeTextCopied: function(text, codeElement) {
 return text;
 }
 };
 window.highlightJsBadge(options);
});
function downloadJSAtOnloadz(){var e=document.createElement("script");e.src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.4.0/highlight.min.js",document.body.appendChild(e)}window.addEventListener?window.addEventListener("load",downloadJSAtOnloadz,!1):window.attachEvent?window.attachEvent("onload",downloadJSAtOnloadz):window.onload=downloadJSAtOnloadz;
//]]>
</script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.4.0/highlight.min.js'/>
</b:if>

At this point, the colored Syntax Highlighter installation stage with the copy feature can be used.

How to use Syntax Highlighter in Blogger

To use the syntax highlighter in a post, simply call it using the code <pre><code class="type_code">.

Example implementation:

<pre><code class="html/css/js">
<!-- Your code HTML here -->
</code></pre>

Note: Parse first before entering the code into the blogger editor so as not to damage the appearance of the template.