Develop Reference

How to use JS file in react

I have downloaded a template for my website which calls below js file from my react component.
!(function($) {
"use strict";
// Hero typed
if ($('.typed').length) {
var typed_strings = $(".typed").data('typed-items');
typed_strings = typed_strings.split(',')
new Typed('.typed', {
strings: typed_strings,
loop: true,
typeSpeed: 100,
backSpeed: 50,
backDelay: 2000
});
}
// Smooth scroll for the navigation menu and links with .scrollto classes
$(document).on('click', '.nav-menu a, .scrollto', function(e) {
if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) {
e.preventDefault();
var target = $(this.hash);
if (target.length) {
var scrollto = target.offset().top;
$('html, body').animate({
scrollTop: scrollto
}, 1500, 'easeInOutExpo');
if ($(this).parents('.nav-menu, .mobile-nav').length) {
$('.nav-menu .active, .mobile-nav .active').removeClass('active');
$(this).closest('li').addClass('active');
}
if ($('body').hasClass('mobile-nav-active')) {
$('body').removeClass('mobile-nav-active');
$('.mobile-nav-toggle i').toggleClass('icofont-navigation-menu icofont-close');
}
return false;
}
}
});
// Activate smooth scroll on page load with hash links in the url
$(document).ready(function() {
if (window.location.hash) {
var initial_nav = window.location.hash;
if ($(initial_nav).length) {
var scrollto = $(initial_nav).offset().top;
$('html, body').animate({
scrollTop: scrollto
}, 1500, 'easeInOutExpo');
}
}
});
$(document).on('click', '.mobile-nav-toggle', function(e) {
$('body').toggleClass('mobile-nav-active');
$('.mobile-nav-toggle i').toggleClass('icofont-navigation-menu icofont-close');
});
$(document).click(function(e) {
var container = $(".mobile-nav-toggle");
if (!container.is(e.target) && container.has(e.target).length === 0) {
if ($('body').hasClass('mobile-nav-active')) {
$('body').removeClass('mobile-nav-active');
$('.mobile-nav-toggle i').toggleClass('icofont-navigation-menu icofont-close');
}
}
});
// Navigation active state on scroll
var nav_sections = $('section');
var main_nav = $('.nav-menu, .mobile-nav');
$(window).on('scroll', function() {
var cur_pos = $(this).scrollTop() + 200;
nav_sections.each(function() {
var top = $(this).offset().top,
bottom = top + $(this).outerHeight();
if (cur_pos >= top && cur_pos <= bottom) {
if (cur_pos <= bottom) {
main_nav.find('li').removeClass('active');
}
main_nav.find('a[href="#' + $(this).attr('id') + '"]').parent('li').addClass('active');
}
if (cur_pos < 300) {
$(".nav-menu ul:first li:first").addClass('active');
}
});
});
// Back to top button
$(window).scroll(function() {
if ($(this).scrollTop() > 100) {
$('.back-to-top').fadeIn('slow');
} else {
$('.back-to-top').fadeOut('slow');
}
});
$('.back-to-top').click(function() {
$('html, body').animate({
scrollTop: 0
}, 1500, 'easeInOutExpo');
return false;
});
// jQuery counterUp
$('[data-toggle="counter-up"]').counterUp({
delay: 10,
time: 1000
});
// Skills section
$('.skills-content').waypoint(function() {
$('.progress .progress-bar').each(function() {
$(this).css("width", $(this).attr("aria-valuenow") + '%');
});
}, {
offset: '80%'
});
// Porfolio isotope and filter
$(window).on('load', function() {
var portfolioIsotope = $('.portfolio-container').isotope({
itemSelector: '.portfolio-item',
layoutMode: 'fitRows'
});
$('#portfolio-flters li').on('click', function() {
$("#portfolio-flters li").removeClass('filter-active');
$(this).addClass('filter-active');
portfolioIsotope.isotope({
filter: $(this).data('filter')
});
aos_init();
});
// Initiate venobox (lightbox feature used in portofilo)
$(document).ready(function() {
$('.venobox').venobox();
});
});
// Testimonials carousel (uses the Owl Carousel library)
$(".testimonials-carousel").owlCarousel({
autoplay: true,
dots: true,
loop: true,
responsive: {
0: {
items: 1
},
768: {
items: 2
},
900: {
items: 3
}
}
});
// Portfolio details carousel
$(".portfolio-details-carousel").owlCarousel({
autoplay: true,
dots: true,
loop: true,
items: 1
});
// Init AOS
function aos_init() {
AOS.init({
duration: 1000,
easing: "ease-in-out-back",
once: true
});
}
$(window).on('load', function() {
aos_init();
});
})(jQuery);
I paste html file in my component and import all css and js file.
But it shows error in js file.
Line 7:1: Expected an assignment or function call and instead saw an expression no-unused-expressions
Line 14:9: 'Typed' is not defined no-undef
Line 25:9: Unexpected use of 'location' no-restricted-globals
Line 25:85: Unexpected use of 'location' no-restricted-globals
Line 183:5: 'AOS' is not defined no-undef
Line 193:4: 'jQuery' is not defined no-undef
So how do I import this js into my react component.
Thanks in advance.

You don't just import a script you've downloaded from somewhere that uses jQuery, Owl Carousel etc., into a React component.
Find or write React components that do the things that script does and use them in your React app.

You can not simply put pure JS / Jquery code into a React component and expect it to work.
Look for a more "React" - ish way do do this. There are probably some libraries doing the same thing You're looking for :)
Look for a React library responsible for animating different elements. As far as I can see that is what You are trying to achieve

How to listen to only the first scroll event on javascript/jquery?

I'm currently working on implementing my own version of snap-scrolling using vanilla JavaScript, and while I've got it mostly working as of now, I'm having trouble handling the scroll events.
My HTML looks something like this:
<div class="container">
<div id="item1"></div>
<div id="item2"></div>
<div id="item3"></div>
<div id="item4"></div>
</div>
And my JS looks something like this:
var pos = 0;
var isScrolling = false;
var id = 1;
$(window).scroll(function() {
if (!isScrolling) {
isScrolling = true;
var curPos = $(this).scrollTop();
if (curPos > pos) {
// scrolling down
if (id < 4) {
id++;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500);
}
} else {
// scrolling up
if (id > 1) {
id--;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500);
}
}
isScrolling = false;
pos = curPos;
}
});
What currently happens is when I scroll down my mouse wheel, it will do the animation but will keep proceeding to the next divs because of the multiple scroll events being fired. How do I make it so that it only listens to the first event (whether it scrolls up or down)?

A hacky way is to use timer:
var pos = 0;
var isScrolling = false;
var id = 1;
var lastScrollTime = $.now();
$(window).scroll(function() {
if ((!isScrolling)&&((($.now()-lastScrollTime)>3000)) {
isScrolling = true;
var curPos = $(this).scrollTop();
if (curPos > pos) {
// scrolling down
if (id < 4) {
id++;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500);
}
} else {
// scrolling up
if (id > 1) {
id--;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500);
}
}
isScrolling = false;
pos = curPos;
lastScrollTime = $.now();
}
});

You can register one time listeners in jQuery using jQuery.one.
EDIT:
You can use the complete callback of jQuery.animate to stop/start responding to scroll events.
var isScrolling = false;
$(window).on('scroll', function () {
if (!isScrolling) {
isScrolling = true;
var curPos = $(this).scrollTop();
if (curPos > pos) {
// scrolling down
if (id < 4) {
id++;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500,function(){
isScrolling = false;
});
}
} else {
// scrolling up
if (id > 1) {
id--;
$('html, body').animate({
scrollTop: $('#item' + id).offset().top
}, 500,function(){
isScrolling = false;
});
}
}
pos = curPos;
}
});

There's no easy way to deal with what it is known as kinetic scrolling.
Browsers do not provide developers a proper way to distinguish the meaningful scrolling from the inertial ones.
However, there are some attempts out there that aims to solve this issue, such as Lethargy.
Not 100% ideal, but very close to it.
Other than that, you can take a look at libraries like fullPage.js where another attempt to solve the issue was made.

vertical slider on scroll

i am searching for a slider which should change the slides vertically on scroll.
This is the refrence Url : https://www.uber.com/ The Mobile slider
Please help me,i am trying to do this since7,8 hours.
this is the code i am trying to use.
$(document).ready(function() {
// var totalheight=$(window).height();
// $('.carosel-section').css('height',totalheight);
//Set each section's height equals to the window height
//$('.moveable').height($(window).height());
$('.moveable').first().addClass('active');
$('.carousel-wrap').on('mousewheel DOMMouseScroll', function (e) {
e.preventDefault();//prevent the default mousewheel scrolling
var active = $('.moveable.active');
var delta = e.originalEvent.detail < 0 || e.originalEvent.wheelDelta > 0 ? 1 : -1;
if (delta < 0) {
//mousewheel down handler
next = active.next();
if (next.length) {
var timer = setTimeout(function () {
$('body, html').animate({
scrollTop: next.offset().top
}, 'fast');
// move the indicator 'active' class
next.addClass('active')
.siblings().removeClass('active');
clearTimeout(timer);
}, 100);
}
} else {
prev = active.prev();
if (prev.length) {
var timer = setTimeout(function () {
$('body, html').animate({
scrollTop: prev.offset().top
}, 'slow');
prev.addClass('active')
.siblings().removeClass('active');
clearTimeout(timer);
}, 800);
}
}
});
});

Have you tried looking at Parallax.js? I think that is what you are looking for. The examples on the main page should give you a quick start!

ScrollTop issue

I have an accordion feature that does not adjust the viewport to the top of the open element when it is clicked. View on mobile or small screen size to see what i am talking about: http://startyourlife.com/biz-training/
Here is an example of one that works: http://tympanus.net/Tutorials/FlexibleSlideToTopAccordion/
You will see that if you click it scrolls to the top of that element. Here is the javascript I currently have:
if (section_title.length) {
section_title.click(function () {
if ((!section.hasClass('active')) && (!running)) {
running = true;
var currentHeight, newHeight;
items.each(function () {
if ($(this).hasClass('active')) {
$(this).removeClass('active');
}
});
if (item.length) {
item.addClass('active');
}
sections.each(function () {
if ($(this).hasClass('active')) {
currentHeight = $(this).find('.w-timeline-section-content').height();
$(this).find('.w-timeline-section-content').slideUp();
}
});
newHeight = section_content.height();
if (activeIndex < index) {
$('html').animate({
scrollTop: $('html').scrollTop() - currentHeight
});
}
section_content.slideDown(null, function () {
sections.each(function () {
if ($(this).hasClass('active')) {
$(this).removeClass('active');
}
});
section.addClass('active');
activeIndex = index;
running = false;
});
}
});
}

Fixed it, add this right after the last line "running = false"
var target = $(section);
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}

jQuery smooth scroll doesn't change URL

Everything is working as it should, however the URL does not change when the jQuery is in place. Is there anyway to have it smooth scroll and change the url at the same time? I tried a different method before this however it wasn't as cross browser compatible as this.
My HTML is:
<li class="representing-you-online">Representing you online</li>
<li class="developing-your-people">Developing your people</li>
My jQuery is:
$(document).ready(function() {
$('a[href^="#"]').click(function() {
var target = $(this.hash);
if (target.length == 0) target = $('a[name="' + this.hash.substr(1) + '"]');
if (target.length == 0) target = $('html');
$('html, body').animate({ scrollTop: target.offset().top }, 500);
return false;
});
});
$(document).ready(function(){
$('#logo a').click(function () {
$('body,html').animate({
scrollTop: 0
}, 800);
return false;
});
});
Thanks!

Replace the click handling code for your anchors like this:
$(document).ready(function() {
$('a[href^="#"]').click(function() {
var target = $(this.hash);
var hash = this.hash;
if (target.length == 0) target = $('a[name="' + this.hash.substr(1) + '"]');
if (target.length == 0) target = $('html');
$('html, body').animate({ scrollTop: target.offset().top }, 500, function (){
location.hash = hash;
});
return false;
});
});
Please note the complete function in the end of the jquery .animate(). It changes the URL.
See the demo here.