MediaWiki:Common.js

/* Any JavaScript here will be loaded for all users on every page load. */

// Make the TOC draggable:

dragElement(document.getElementById("lessons"));
dragElement(document.getElementById("terminal"));

function dragElement(elmnt) {
  var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
  if (document.getElementById(elmnt.id + "header")) {
    // if present, the header is where you move the DIV from:
    document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
  } else {
    // otherwise, move the DIV from anywhere inside the DIV:
    elmnt.onmousedown = dragMouseDown;
  }

  function dragMouseDown(e) {
    e = e || window.event;
    e.preventDefault();
    // get the mouse cursor position at startup:
    pos3 = e.clientX;
    pos4 = e.clientY;
    document.onmouseup = closeDragElement;
    // call a function whenever the cursor moves:
    document.onmousemove = elementDrag;
  }

  function elementDrag(e) {
    e = e || window.event;
    e.preventDefault();
    // calculate the new cursor position:
    pos1 = pos3 - e.clientX;
    pos2 = pos4 - e.clientY;
    pos3 = e.clientX;
    pos4 = e.clientY;
    // set the element's new position:
    elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
    elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
  }

  function closeDragElement() {
    // stop moving when mouse button is released:
    document.onmouseup = null;
    document.onmousemove = null;
  }
}

// TERMINAL ON FRONT PAGE

function HideTerminal() {
const terminal = document.querySelector('#terminal');
  terminal.style.display = terminal.style.display === 'block' ? 'none' : 'block';
}

//TYPEWRITER 

//terminalIntro

const typedTextSpan = document.querySelector(".typed-text");
const cursorSpan = document.querySelector(".cursor");

const textArray = ['programming', 'electronics', 'augmented & virtual reality', 'machine learning & AI'];
const typingDelay = 200;
const erasingDelay = 100;
const newTextDelay = 2000; // Delay between current and next text
let textArrayIndex = 0;
let charIndex = 0;

function type() {
  if (charIndex < textArray[textArrayIndex].length) {
    if(!cursorSpan.classList.contains("typing")) cursorSpan.classList.add("typing");
    typedTextSpan.textContent += textArray[textArrayIndex].charAt(charIndex);
    charIndex++;
    setTimeout(type, typingDelay);
  } 
  else {
    cursorSpan.classList.remove("typing");
  	setTimeout(erase, newTextDelay);
  }
}

function erase() {
	if (charIndex > 0) {
    if(!cursorSpan.classList.contains("typing")) cursorSpan.classList.add("typing");
    typedTextSpan.textContent = textArray[textArrayIndex].substring(0, charIndex-1);
    charIndex--;
    setTimeout(erase, erasingDelay);
  } 
  else {
    cursorSpan.classList.remove("typing");
    textArrayIndex++;
    if(textArrayIndex>=textArray.length) textArrayIndex=0;
    setTimeout(type, typingDelay + 1100);
  }
}

document.addEventListener("DOMContentLoaded", function() { // On DOM Load initiate the effect
  if(textArray.length) setTimeout(type, newTextDelay + 250);
});