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Dynamic Table of contents
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Document</title> | |
| <style> | |
| .container { | |
| width: 700px; | |
| margin: 0 auto; | |
| } | |
| .content > div { | |
| min-height: 100vh; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <div class="flex"> | |
| <div> | |
| <ol id="toc-list"> | |
| </ol> | |
| <select id="toc-select"> | |
| </select> | |
| </div> | |
| <div class="content"> | |
| <div> | |
| <h3>Example 1</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Example 2</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Example 3</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Example 4</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Example 5</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Example 6</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| <div> | |
| <h3>Last section</h3> | |
| Lorem ipsum dolor sit amet consectetur adipisicing elit. Adipisci, modi officia. Nesciunt reiciendis | |
| debitis quis, consectetur voluptates magni eveniet perspiciatis consequatur molestiae quasi porro | |
| laboriosam dicta ipsam fuga quam esse? | |
| <hr> | |
| </div> | |
| </div> | |
| </div> | |
| </div> | |
| <script> | |
| document.addEventListener("DOMContentLoaded", () => { | |
| let headings = fetchHeadings(); | |
| let tableOfContentsList = document.getElementById("toc-list"); | |
| let tableOfContentsSelect = document.getElementById("toc-select"); | |
| assignUniqueIdToSectionHeading(headings); | |
| loadElements(tableOfContentsList, headings); | |
| loadElements(tableOfContentsSelect, headings); | |
| document.getElementById("toc-select").addEventListener("change", (e) => { | |
| window.location.hash = e.target.value; | |
| }) | |
| }) | |
| let loadElements = function (targetElement, headings) { | |
| targetElement.innerHTML = ""; | |
| let elements = []; | |
| let tag = targetElement.tagName.toLowerCase(); | |
| elements = actions[tag](headings); // actions is a lookup object, and tag is a key there | |
| elements.forEach(item =>targetElement.appendChild(item)); | |
| } | |
| let prepareListElements = function (headings) { | |
| let elements = []; | |
| headings.forEach(heading => { | |
| let element = document.createElement("li"); | |
| let link = document.createElement("a"); | |
| link.setAttribute("href", "#" + heading.id); | |
| link.innerHTML = heading.innerHTML; | |
| element.appendChild(link); | |
| elements.push(element); | |
| }); | |
| return elements; | |
| } | |
| let prepareSelectOptions = function (headings) { | |
| let elements = []; | |
| headings.forEach(heading => { | |
| let element = document.createElement("option"); | |
| element.setAttribute("value", heading.id); | |
| element.innerHTML = heading.innerHTML; | |
| elements.push(element); | |
| }); | |
| return elements; | |
| } | |
| let fetchHeadings = function () { | |
| return document.querySelectorAll(".content h3"); | |
| } | |
| let assignUniqueIdToSectionHeading = function (headings) { | |
| let uniqueId = 1; | |
| headings.forEach(heading => { | |
| heading.setAttribute("id", "section-" + uniqueId); | |
| uniqueId++; | |
| }); | |
| } | |
| let actions = {"ol":prepareListElements,"select": prepareSelectOptions}; | |
| </script> | |
| </body> | |
| </html> |
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