web_design/bakery_website/public/main.js

//navbar
const menuBtn = document.querySelector(".menu-btn");
const navi = document.querySelector(".nav");

menuBtn.addEventListener("click", ()=>{
    menuBtn.classList.toggle("active");
    navi.classList.toggle("active");
});

//video
const videoBtn = document.querySelectorAll(".nav-btn");
const slides = document.querySelectorAll(".video-slide");
const contents = document.querySelectorAll(".content");

var sliderNav = function(manual){
    videoBtn.forEach((btn)=>{
        btn.classList.remove("active");
    });

    slides.forEach((slide)=>{
        slide.classList.remove("active");
    });
    contents.forEach((content)=>{
        content.classList.remove("active");
    });

    videoBtn[manual].classList.add("active");
    slides[manual].classList.add("active");
    contents[manual].classList.add("active");
}
videoBtn.forEach((btn, i)=>{
    btn.addEventListener("click", ()=>{
        sliderNav(i);
    });
});

//carousel
const carousel = document.querySelector(".carousel"),
firstImg = carousel.querySelectorAll("img")[0],
arrowIcons = document.querySelectorAll(".wrapper i");

let isDragStart = false, isDragging = false, prevPageX, prevScrollLeft, positionDiff;

const showHideIcons = () => {
    // showing and hiding prev/next icon according to carousel scroll left value
    let scrollWidth = carousel.scrollWidth - carousel.clientWidth; // getting max scrollable width
    arrowIcons[0].style.display = carousel.scrollLeft == 0 ? "none" : "block";
    arrowIcons[1].style.display = carousel.scrollLeft == scrollWidth ? "none" : "block";
}

arrowIcons.forEach(icon => {
    icon.addEventListener("click", () => {
        let firstImgWidth = firstImg.clientWidth + 14; // getting first img width & adding 14 margin value
        // if clicked icon is left, reduce width value from the carousel scroll left else add to it
        carousel.scrollLeft += icon.id == "left" ? -firstImgWidth : firstImgWidth;
        setTimeout(() => showHideIcons(), 60); // calling showHideIcons after 60ms
    });
});

const autoSlide = () => {
    // if there is no image left to scroll then return from here
    if(carousel.scrollLeft - (carousel.scrollWidth - carousel.clientWidth) > -1 || carousel.scrollLeft <= 0) return;

    positionDiff = Math.abs(positionDiff); // making positionDiff value to positive
    let firstImgWidth = firstImg.clientWidth + 14;
    // getting difference value that needs to add or reduce from carousel left to take middle img center
    let valDifference = firstImgWidth - positionDiff;

    if(carousel.scrollLeft > prevScrollLeft) { // if user is scrolling to the right
        return carousel.scrollLeft += positionDiff > firstImgWidth / 3 ? valDifference : -positionDiff;
    }
    // if user is scrolling to the left
    carousel.scrollLeft -= positionDiff > firstImgWidth / 3 ? valDifference : -positionDiff;
}

const dragStart = (e) => {
    // updatating global variables value on mouse down event
    isDragStart = true;
    prevPageX = e.pageX || e.touches[0].pageX;
    prevScrollLeft = carousel.scrollLeft;
}

const dragging = (e) => {
    // scrolling images/carousel to left according to mouse pointer
    if(!isDragStart) return;
    e.preventDefault();
    isDragging = true;
    carousel.classList.add("dragging");
    positionDiff = (e.pageX || e.touches[0].pageX) - prevPageX;
    carousel.scrollLeft = prevScrollLeft - positionDiff;
    showHideIcons();
}

const dragStop = () => {
    isDragStart = false;
    carousel.classList.remove("dragging");

    if(!isDragging) return;
    isDragging = false;
    autoSlide();
}

carousel.addEventListener("mousedown", dragStart);
carousel.addEventListener("touchstart", dragStart);

document.addEventListener("mousemove", dragging);
carousel.addEventListener("touchmove", dragging);

document.addEventListener("mouseup", dragStop);
carousel.addEventListener("touchend", dragStop);

//gallery-tab
//selecting all required elements
const filterItem = document.querySelector(".gallery-items");
const filterImg = document.querySelectorAll(".gallery .image-gal");

window.onload = ()=>{ //after window loaded
  filterItem.onclick = (selectedItem)=>{ //if user click on filterItem div
    if(selectedItem.target.classList.contains("item-gallery")){ //if user selected item has .item class
      filterItem.querySelector(".active").classList.remove("active"); //remove the active class which is in first item
      selectedItem.target.classList.add("active"); //add that active class on user selected item
      let filterName = selectedItem.target.getAttribute("data-name"); //getting data-name value of user selected item and store in a filtername variable
      filterImg.forEach((image) => {
        let filterImges = image.getAttribute("data-name"); //getting image data-name value
        //if user selected item data-name value is equal to images data-name value
        //or user selected item data-name value is equal to "all"
        if((filterImges == filterName) || (filterName == "all")){
          image.classList.remove("hide"); //first remove the hide class from the image
          image.classList.add("show"); //add show class in image
        }else{
          image.classList.add("hide"); //add hide class in image
          image.classList.remove("show"); //remove show class from the image
        }
      });
    }
  }
  for (let i = 0; i < filterImg.length; i++) {
    filterImg[i].setAttribute("onclick", "preview(this)"); //adding onclick attribute in all available images
  }
}

//fullscreen image preview function
//selecting all required elements
const previewBox = document.querySelector(".preview-box"),
categoryName = previewBox.querySelector(".title-gal p"),
previewImg = previewBox.querySelector("img"),
closeIcon = previewBox.querySelector(".icon-gal"),
shadow = document.querySelector(".shadow");

function preview(element){
  //once user click on any image then remove the scroll bar of the body, so user can't scroll up or down
  document.querySelector("body").style.overflow = "hidden";
  let selectedPrevImg = element.querySelector("img").src; //getting user clicked image source link and stored in a variable
  let selectedImgCategory = element.getAttribute("data-name"); //getting user clicked image data-name value
  previewImg.src = selectedPrevImg; //passing the user clicked image source in preview image source
  categoryName.textContent = selectedImgCategory; //passing user clicked data-name value in category name
  previewBox.classList.add("show"); //show the preview image box
  shadow.classList.add("show"); //show the light grey background
  closeIcon.onclick = ()=>{ //if user click on close icon of preview box
    previewBox.classList.remove("show"); //hide the preview box
    shadow.classList.remove("show"); //hide the light grey background
    document.querySelector("body").style.overflow = "auto"; //show the scroll bar on body
  }
}