Article updated 4 February 2020 at 5 h 05 me

 

How to display and present sample code on a website.

We present 3 solutions.
PrismCodemirrorSyntaxHighlighter

 

Editor's note: We have a preference for Prims.
   

1) Prism

Highlighter lightweight and extensible syntax, designed to meet the modern web standards. It is used in thousands of websites, including some of those you visit daily.

How to install?

Select and download items desired configuration on site. 2 files are received, to JavaScripts to CSS. Stored on the server in your website folder.   For javaScript, indicated in your web page between <head> and </head> the way or find code.
<script type='text/javascript' src='/js/prism.js'></script>
Looks like Prism.js   Add the CSS code for that class must be defined in your config file CSS.

/* PrismJS 1.15.0
  https://prismjs.com/download.html#themes=prism-dark&languages=markup+css+clike+javascript+markup-templating+php+javadoclike+phpdoc+php-extras&plugins=line-highlight+line-numbers+toolbar+autoloader+show-language+copy-to-clipboard */
  /**
  * prism.js Dark theme for JavaScript, CSS and HTML
  * Based on the slides of the talk “/Reg(exp){2}lained/”
  * @author Lea Verou
  */

code[class*="language-"],
  pre[class*="language-"] {
  color: white;
  background: none;
  text-shadow: 0 -.1em .2em black;
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  font-size: 1em;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.5;

 -moz-tab-size: 4;
  -o-tab-size: 4;
  tab-size: 4;

 -webkit-hyphens: none;
  -moz-hyphens: none;
  -ms-hyphens: none;
  hyphens: none;
  }

@media print {
  code[class*="language-"],
  pre[class*="language-"] {
  text-shadow: none;
  }
  }

pre[class*="language-"],
  :not(pre) > code[class*="language-"] {
  background: black;
  }

/* Code blocks */
  pre[class*="language-"] {
  padding: 1em;
  margin: .5em 0;
  overflow: auto;
  border: .3em solid hsl(30, 20%, 40%);
  border-radius: .5em;
  box-shadow: 1px 1px .5em black inset;
  }

/* Inline code */
  :not(pre) > code[class*="language-"] {
  padding: .15em .2em .05em;
  border-radius: .3em;
  border: .13em solid hsl(30, 20%, 40%);
  box-shadow: 1px 1px .3em -.1em black inset;
  white-space: normal;
  }

.token.comment,
  .token.prolog,
  .token.doctype,
  .token.cdata {
  color: hsl(30, 20%, 50%);
  }

.token.punctuation {
  opacity: .7;
  }

.namespace {
  opacity: .7;
  }

.token.property,
  .token.tag,
  .token.boolean,
  .token.number,
  .token.constant,
  .token.symbol {
  color: hsl(350, 40%, 70%);
  }

.token.selector,
  .token.attr-name,
  .token.string,
  .token.char,
  .token.builtin,
  .token.inserted {
  color: hsl(75, 70%, 60%);
  }

.token.operator,
  .token.entity,
  .token.url,
  .language-css .token.string,
  .style .token.string,
  .token.variable {
  color: hsl(40, 90%, 60%);
  }

.token.atrule,
  .token.attr-value,
  .token.keyword {
  color: hsl(350, 40%, 70%);
  }

.token.regex,
  .token.important {
  color: #e90;
  }

.token.important,
  .token.bold {
  font-weight: bold;
  }
  .token.italic {
  font-style: italic;
  }

.token.entity {
  cursor: help;
  }

.token.deleted {
  color: red;
  }
  code, pre {
  font-family: Consolas, Monaco, 'Andale Mono', 'Lucida Console', monospace;
  hyphens: none;
  }

pre {
  max-height: 30em;
  overflow: auto;
  }

pre > code.highlight {
  outline: .4em solid red;
  outline-offset: .4em;
  }
  pre[class*="language-"].line-numbers {
  position: relative;
  padding-left: 3.8em;
  counter-reset: linenumber;
  }

pre[class*="language-"].line-numbers > code {
  position: relative;
  white-space: inherit;
  }

pre[data-line] {
  position: relative;
  padding: 1em 0 1em 3em;
  }

.line-highlight {
  position: absolute;
  left: 0;
  right: 0;
  padding: inherit 0;
  margin-top: 1em; /* Same as .prism’s padding-top */

 background: hsla(24, 20%, 50%,.08);
  background: linear-gradient(to right, hsla(24, 20%, 50%,.1) 70%, hsla(24, 20%, 50%,0));

 pointer-events: none;

 line-height: inherit;
  white-space: pre;
  }

 .line-highlight:before,
  .line-highlight[data-end]:after {
  content: attr(data-start);
  position: absolute;
  top: .4em;
  left: .6em;
  min-width: 1em;
  padding: 0 .5em;
  background-color: hsla(24, 20%, 50%,.4);
  color: hsl(24, 20%, 95%);
  font: bold 65%/1.5 sans-serif;
  text-align: center;
  vertical-align: .3em;
  border-radius: 999px;
  text-shadow: none;
  box-shadow: 0 1px white;
  }

 .line-highlight[data-end]:after {
  content: attr(data-end);
  top: auto;
  bottom: .4em;
  }

.line-numbers .line-highlight:before,
  .line-numbers .line-highlight:after {
  content: none;
  }

pre[class*="language-"].line-numbers {
  position: relative;
  padding-left: 3.8em;
  counter-reset: linenumber;
  }

pre[class*="language-"].line-numbers > code {
  position: relative;
  white-space: inherit;
  }

.line-numbers .line-numbers-rows {
  position: absolute;
  pointer-events: none;
  top: 0;
  font-size: 100%;
  left: -3.8em;
  width: 3em; /* works for line-numbers below 1000 lines */
  letter-spacing: -1px;
  border-right: 1px solid #999;

 -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;

}

 .line-numbers-rows > span {
  pointer-events: none;
  display: block;
  counter-increment: linenumber;
  }

 .line-numbers-rows > span:before {
  content: counter(linenumber);
  color: #999;
  display: block;
  padding-right: 0.8em;
  text-align: right;
  }
  Line Numbering To display line numbers, an additional file prism-line-numbers.js will add javaScript file and add the file path in the configuration of your Web page.
<script type='text/javascript' src='/js/prism.js'></script>
<script type='text/javascript' src='/js/prism-line-numbers.js'></script>
  Prism-line-numbers.js

(function () {

 if (typeof self === 'undefined' || !self.Prism || !self.document) {
  return;
  }

 /**
  * Plugin name which is used as a class name for <pre> which is activating the plugin
  * @type {String}
  */
  var PLUGIN_NAME = 'line-numbers';

 /**
  * Regular expression used for determining line breaks
  * @type {RegExp}
  */
  var NEW_LINE_EXP = /\n(?!$)/g;

 /**
  * Resizes line numbers spans according to height of line of code
  * @param {Element} element <pre> element
  */
  var _resizeElement = function (element) {
  var codeStyles = getStyles(element);
  var whiteSpace = codeStyles['white-space'];

 if (whiteSpace === 'pre-wrap' || whiteSpace === 'pre-line') {
  var codeElement = element.querySelector('code');
  var lineNumbersWrapper = element.querySelector('.line-numbers-rows');
  var lineNumberSizer = element.querySelector('.line-numbers-sizer');
  var codeLines = codeElement.textContent.split(NEW_LINE_EXP);

 if (!lineNumberSizer) {
  lineNumberSizer = document.createElement('span');
  lineNumberSizer.className = 'line-numbers-sizer';

 codeElement.appendChild(lineNumberSizer);
  }

 lineNumberSizer.style.display = 'block';

 codeLines.forEach(function (line, lineNumber) {
  lineNumberSizer.textContent = line || '\n';
  var lineSize = lineNumberSizer.getBoundingClientRect().height;
  lineNumbersWrapper.children[lineNumber].style.height = lineSize + 'px';
  });

 lineNumberSizer.textContent = '';
  lineNumberSizer.style.display = 'none';
  }
  };

 /**
  * Returns style declarations for the element
  * @param {Element} element
  */
  var getStyles = function (element) {
  if (!element) {
  return null;
  }

 return window.getComputedStyle ? getComputedStyle(element) : (element.currentStyle || null);
  };

 window.addEventListener('resize', function () {
  Array.prototype.forEach.call(document.querySelectorAll('pre.' + PLUGIN_NAME), _resizeElement);
  });

 Prism.hooks.add('complete', function (env) {
  if (!env.code) {
  return;
  }

 // works only for <code> wrapped inside <pre> (not inline)
  var pre = env.element.parentNode;
  var clsReg = /(?:^|\s)line-numbers(?:\s|$)/;
  if (
  !pre || !/pre/i.test(pre.nodeName) ||
  // Abort only if nor the <pre> nor the <code> have the class
  (!clsReg.test(pre.className) && !clsReg.test(env.element.className))
  ) {
  return;
  }

 if (env.element.querySelector('.line-numbers-rows')) {
  // Abort if line numbers already exists
  return;
  }

 if (clsReg.test(env.element.className)) {
  // Remove the class 'line-numbers' from the <code>
  env.element.className = env.element.className.replace(clsReg, ' ');
  }
  if (!clsReg.test(pre.className)) {
  // Add the class 'line-numbers' to the <pre>
  pre.className += ' line-numbers';
  }

 var match = env.code.match(NEW_LINE_EXP);
  var linesNum = match ? match.length + 1 : 1;
  var lineNumbersWrapper;

 var lines = new Array(linesNum + 1);
  lines = lines.join('<span></span>');

 lineNumbersWrapper = document.createElement('span');
  lineNumbersWrapper.setAttribute('aria-hidden', 'true');
  lineNumbersWrapper.className = 'line-numbers-rows';
  lineNumbersWrapper.innerHTML = lines;

 if (pre.hasAttribute('data-start')) {
  pre.style.counterReset = 'linenumber ' + (parseInt(pre.getAttribute('data-start'), 10) - 1);
  }

 env.element.appendChild(lineNumbersWrapper);

 _resizeElement(pre);

 Prism.hooks.run('line-numbers', env);
  });

 Prism.hooks.add('line-numbers', function (env) {
  env.plugins = env.plugins || {};
  env.plugins.lineNumbers = true;
  });

 /**
  * Global exports
  */
  Prism.plugins.lineNumbers = {
  /**
  * Get node for provided line number
  * @param {Element} element pre element
  * @param {Number} number line number
  * @return {Element|undefined}
  */
  getLine: function (element, number) {
  if (element.tagName !== 'PRE' || !element.classList.contains(PLUGIN_NAME)) {
  return;
  }

 var lineNumberRows = element.querySelector('.line-numbers-rows');
  var lineNumberStart = parseInt(element.getAttribute('data-start'), 10) || 1;
  var lineNumberEnd = lineNumberStart + (lineNumberRows.children.length - 1);

 if (number < lineNumberStart) {
  number = lineNumberStart;
  }
  if (number > lineNumberEnd) {
  number = lineNumberEnd;
  }

 var lineIndex = number - lineNumberStart;

 return lineNumberRows.children[lineIndex];
  }
  };

}());

 

How to view the code?

Declare the language you want to display by changing the class line of code 1 (this changes the highlight colors depending on the selected code): class=”language-js class=”language-php class=”language-html
<pre class="line-numbers"><code class="language-html">
Le code ici à déposer que vous souhaitez montrez aux internautes...!
</code></pre>
Showing entitées Small negative side of Prism: The display of the code n & rsquo; is not native. You are forced to use the characters ASII (HTML entities) to display your code correctly. find a page the definition of each entity. A repetitive use promises a heavy task. practical advice: To simply, use your editor to view the edit text faster with computer syntax. Example : With Dreamweaver Paste your text in the part creation. In Part code edit your text displays the same text with HTML entities
 
   

2) Codemirror

One other most advanced operating in the design that can be changed by the user. The code display themes can be changed for better reading. Some difficulties for a novice to install. We explain in detail how to do. 3 steps required for display 1) Enter the path of the CSS themes. 2) Create drop-down button. 3) Paste JavaScript to display. 4) Paste the code you want to display. IMPORTANT NOTE : For each new code display you will need to change the ID of each frame in the script not to confuse the time of loading of the page and reading scripts. See explanation below. Editor's note: in order to overcome the automatic reloading we add an event on Onchange to change all resources at once. >>Onchange=”javascript:location.reload()”<<

 

SELECT COLOR DISPLAY Select a theme:

 

CSS
et JS

 

Pour commencer, renseigner le chemin des class Css et Javascript en haut de votre page.

 

Combo BUTTON

 

PASTE THE SCRIPT TO DISPLAY YOUR TEXT

 

NEGATIVE POINT Vous êtes obligé pour chaque cadre de modifier l'ID de textarea (Le même texte serait répéter). 2 ligne doivent être spécifié à la place de NOUVEAU NOM, insérer un mot que vous aurez choisi (Les deux doivent être identique)
 

3) SyntaxHighlighter

  Actuellement en rédaction sur d'autre sujet, L'équipe FI continue dès que possible.              


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2 thoughts on “View of computer code

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