script.js

const modal = document.querySelector('.modal');
const previews = document.querySelectorAll('.galleryContainer img');
const original = document.querySelector('.full-img')

previews.forEach(preview => {
  preview.addEventListener('click', () => {
    modal.classList.add("open");
    original.classList.add('open');
    const originalSrc = preview.getAttribute("src");
    original.src = `${originalSrc}` 
  })
})

modal.addEventListener('click', (e) => {
  if(e.target.classList.contains('modal')){
    modal.classList.remove('open');
    original.classList.remove('open');
  }
})


filterSelection("all")
function filterSelection(c) {
  var x, i;
  x = document.getElementsByClassName("filterDiv");
  if (c == "all") c = "";
  for (i = 0; i < x.length; i++) {
    removeClass(x[i], "show");
    if (x[i].className.indexOf(c) > -1) addClass(x[i], "show");
  }
}

function addClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {element.className += " " + arr2[i];}
  }
}

function removeClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);     
    }
  }
  element.className = arr1.join(" ");
}

var btnContainer = document.getElementById("myBtnContainer");
var btns = btnContainer.getElementsByClassName("btn");
for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", function(){
    var current = document.getElementsByClassName("active");
    current[0].className = current[0].className.replace(" active", "");
    this.className += " active";
  });
}

let checkbox = document.querySelector('input[name=theme]')

checkbox.addEventListener('change', function() {
  if(this.checked){
    trans()
    document.documentElement.setAttribute('data-theme', 'dark')
  } else {
    trans()
    document.documentElement.setAttribute('data-theme', 'light')


  }
})

let trans = () => {
  document.documentElement.classList.add('transition');
  window.setTimeout(() => {
    document.documentElement.classList.remove('transition')
  }, 300)
}