Develop Reference

Limiting area of page scroll on navigation click

I am using the following jquery code to scroll to particular sections when a menu in the navigation tab is clicked. You must have well guessed by now that its a one page website. So coming further, the problem is that when the menu is clicked it scrolls to that particular DIV section but the header hides behind the menu's div. I mean it scrolls way too much up. I want to limit the level of scrolling. Say the it should stop 200px before than what it actually reaches a stop point now. Is it possible?
Here is my code
$(document).ready(function() {
$('body').find('a').click(function(){
var $href = $(this).attr('href');
var $anchor = $($href).offset();
var $li = $(this).parent('li');
$li.addClass('active');
$li.siblings().removeClass('active');
$('body,html').animate({ scrollTop: $anchor.top }, 1000);
return false;
});
});

Instead of hard coding the header value, a better approach would be dynamically getting the height of header, so it won't create issues in mobile and other devices.
$(document).ready(function() {
$('body').find('a').click(function(){
var $heightEx = $('.navbar').height(); // use your respective selector
var $href = $(this).attr('href');
var $anchor = $($href).offset();
var $li = $(this).parent('li');
$li.addClass('active');
$li.siblings().removeClass('active');
$('body,html').animate({ scrollTop: ($anchor.top - $heightEx) }, 1000);
return false;
});
});
EDIT
This is the code I personally use
$("a").on('click', function(event) {
$heightEx = $('header').height();
if (this.hash !== "") {
event.preventDefault();
var hash = this.hash;
$('html, body').animate({
scrollTop: ($(hash).offset().top - $heightEx)
}, 800);
}
});

Maybe, you need to change 'animate' scrollTop parameter:
$('body,html').animate({ scrollTop: $anchor.top - 200px }, 1000);

scroll-to-top button on a mobile website

I'm trying to make the Scroll To Top button appear once the user started scrolling down, instead of it always being present, even when being at the top. Quick note, I barely have experience with JS, so I have no idea what I'm doing.
Anyway here is the page I'm having an error on: http://www.m.evans-carpentry.com/gallery/projects/
<script>
$(function() {
var $elem = $('#content');
$('#nav_up').fadeIn('slow');
$('#nav_down').fadeIn('slow');
$(window).bind('scrollstart', function(){
$('#nav_up,#nav_down').stop().animate({'opacity':'0.2'});
});
$(window).bind('scrollstop', function(){
$('#nav_up,#nav_down').stop().animate({'opacity':'1'});
});
$('#nav_down').click(
function (e) {
$('html, body').animate({scrollTop: $elem.height()}, 800);
}
);
$('#nav_up').click(
function (e) {
$('html, body').animate({scrollTop: '0px'}, 800);
}
);
});
</script>
Thanks!

you call jquery earlier announcements of jquery on line 30
<script>$('#nav Li: has (ul)').doubleTapToGo ();</script>
insert this line after the call jquery

Your code is too complex, try this:
$(document).ready(function(){
//Check to see if the window is top if not then display button
$(window).scroll(function(){
if ($(this).scrollTop() > 100) {
$('.scrollToTop').fadeIn();
} else {
$('.scrollToTop').fadeOut();
}
});
//Click event to scroll to top
$('.scrollToTop').click(function(){
$('html, body').animate({scrollTop : 0},800);
return false;
});
});
".scrollToTop" is the thing to be clicked that scrolls back to the top of the page.

fixed navigation bar overlaying content when position is given dynamically

I am trying to create a one page website with multiple sections. my problem is that once I click on a link in the navigation bar it scrolls to the item but covers part of the content.
the navigation is only given static positioning when scrolling past its original position (Hope that makes sense). here is a link to my dev site http://wp.matthewwood.me/
here is my code for adding the fixed positioning using JQuery. i tried offsetting it by -50px to accommodate for the fixed nav size but this has not solved the problem.
$(document).ready(function(){
var offset = $(".navbar").offset().top;
$(window).scroll(function() {
if ($(window).scrollTop() >= offset) {
$('.navbar').addClass('navbar-fixed-top');
}
else {
$('.navbar').removeClass('navbar-fixed-top');
}
});
$('a.page-scroll').bind('click', function(event) {
var $anchor = $(this);
$('html, body').stop().animate({scrollTop: $($anchor.attr('href')).offset().top - 50}, 1500, 'easeInOutExpo');
event.preventDefault();
});
});
Any help would be appreciated

When you change from relative to fixed positioning, the block value of the div changes from it's height to zero. This causes the offset issue you are experiencing. See this fiddle here:
https://jsfiddle.net/7muk9zhh/5/
The main things that have changed:
JS:
$(window).scroll(function() {
if ($(window).scrollTop() >= offset) {
$('.navbar').addClass('navbar-fixed-top');
$("#Main").css("margin-top", $(".navbar").height()); //Compensates for fixed positioning
} else {
$('.navbar').removeClass('navbar-fixed-top');
$("#Main").css("margin-top", "");
}
});
$('a.page-scroll').bind('click', function(event) {
var $anchor = $(this);
var globOffset = $(".navbar").height(); //Acts as an offset for the fixed element
$('body').stop().animate({scrollTop: $($anchor).attr('href').offset().top - globOffset}, 1500);
event.preventDefault();
});
HTML:
There is one more problem. The "#home" anchor is used in body. So when finding the offset top for this, it returns 0 (offset of the body element).
Also I think the custom easing 'easeInOutExpo' requires jQuery UI (if that isn't working you need to include it):
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
Hopefully this answers your question!

Use this code: should work properly and has nice smooth scrolling effect:
$(document).ready(function(){
var offset = $(".navbar").offset().top;
$(window).scroll(function() {
if ($(window).scrollTop() >= offset) {
$('.navbar').addClass('navbar-fixed-top');
}
else {
$('.navbar').removeClass('navbar-fixed-top');
}
});
//here it starts
$('a[href^="#"]').bind('click.smoothscroll',function (e) {
e.preventDefault();
var target = this.hash,
$target = $(target);
$('html, body').stop().animate({
'scrollTop': $target.offset().top-90 //change value to your need
}, 1200, 'swing', function () {
window.location.hash = target;
});
});
//end
});

jQuery scroll does not scroll up

I have this code below and the DEMO fiddle.
jQuery(document).ready(function () {
$(window).scroll(function () {
$('html, body').animate({
scrollTop: $('#content').offset().top
}, 1000);
});
});
I'm really confused why I can't scroll up? Anybody can explain to me why and please share some solutions you have.
Any help, is very appreciated.

Alright, this should do what you are asking for. I don't think it is very user friendly, but that is up to you.
Demo Fiddle
//this prevents the animate method from running multiple times.
var scrolling = false;
jQuery(document).ready(function () {
$(window).scroll(function () {
if ( $(window).scrollTop() <= 100 && scrolling === false) {
//set to true to prevent multiple scrolls
scrolling = true;
//run the animation
$('html, body').animate({
scrollTop: $('#content').offset().top
}, 1000, function() {
//when animation is complete, set scrolling to false
scrolling = false;
});
}
});
});

You can't scroll up because your code is wrapped in the scroll() function so it basically locks its position every time you try and scroll with either the mouses scroll wheel or arrow keys. If you amend to the following then it will position itself accordingly when the page first loads.
jQuery(document).ready(function () {
$('html, body').animate({
scrollTop: $('#content').offset().top
}, 1000);
});

Are you trying to have it animate when the link is clicked? If so you need to change your code:
jQuery(document).ready(function () {
$('a').click(function () {
$('html, body').animate({
scrollTop: $('#content').offset().top
}, 1000);
});
});
I would probably add a class or ID value to your link so you can target that one specific link. The code above would apply to all links on your page...although right now there is only the one.
<h1>Scroll to the Content</h1>
jQuery(document).ready(function () {
$('.scrollToContent').click(function () {
$('html, body').animate({
scrollTop: $('#content').offset().top
}, 1000);
});
});

I'm not sure if you will satisfied on this but i found something that can help a little on my problem.
jQuery(document).ready(function () {
$(this).bind('mousewheel', function(e){
if(e.originalEvent.wheelDelta /120 < 1) {
$('html, body').delay(200).animate({
scrollTop: $('#content').offset().top
}, 1000);
}
});
});
DEMO

No need to add the jquery functionality to achieve the requirement that has been asked. Please remove the Jquery code and run the code snippet provided in the fiddle. It is behaving as per the requirement.

Is there a more elegant way to write this in javascript?

$(function () {
$('#button').click(function () {
$('html, body').animate({
scrollTop: $(document).height()
},
400);
return false;
});
$('#top').click(function () {
$('html, body').animate({
scrollTop: '0px'
},
400);
return false;
});
});
I'm using that code to scroll to the bottom/top of the page. I'm wondering if there is a better way to write that? I'm new to jquery so I'm not sure but I've heard using event.preventDefault() may be better instead of return false? If so, where would I insert that?

How about just using a ternary to select the scroll? eg
$(function () {
$('#button').add('#top').click(function () {
$('html, body').animate({
scrollTop : ((this.id=='button') ? $(document).height() : '0px')
},
400);
return false;
});
});
JSFiddle for this code here
You could make this better by adding a class eg 'navButton' to each of these buttons and then using that as the selection ie $('.navButton') - This will eliminate the .add() call.
Also I'd recommend giving the bottom button the id bottom rather than button :) eg
$(function () {
$('.navButton').click(function () {
$('html, body').animate({
scrollTop : ((this.id=='bottom') ? $(document).height() : '0px')
},
400);
});
});

Sure:
$(function() {
var map = {'#button': $(document).height, '#top': '0px'};
jQuery.each(map, function(k, v) {
$(k).click(function() {
$(document.body).animate({
scrollTop:(typeof v === 'function') ? v() : v
},
400);
});
});
});

According to jQuery manual return false and preventDefault does different things:
Example: Cancel a default action and prevent it from bubbling up, return false:
$("a").live("click", function() { return false; })
Example: To cancel only the default action by using the preventDefault method.
$("a").live("click", function(event){
event.preventDefault();
});
So preventDefault is more limited.

Using a specialized plugin jquery.scrollTo.
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/1.4.11/jquery.scrollTo.min.js"></script>
Makes code nice and easy
$(function() {
$('#button').click(function() {
$.scrollTo('max', 400);
return false;
});
$('#top').click(function() {
$.scrollTo(0, 400);
return false;
});
});
Demo: http://jsfiddle.net/disfated/mkZp3/
Also if you want a more flexible code, you could do something like
$(function() {
$(document).on('click', '[data-scroll]', function(e) {
e.preventDefault();
$.scrollTo($(this).data('scroll'), jQuery.fx.speeds._default);
});
});
Then, define scroll behaviour directly in html, example
<button data-scroll="max">scroll to page bottom</button>
<button data-scroll="0">scroll to page top</button>
<button data-scroll="#my_selector">scroll to #my_selector element</button>
Demo: http://jsfiddle.net/disfated/Sj8m7/