Button link to different ID with scroll - javascript

I'm trying to make a single down arrow that jumps to the next ID on the page as you scroll down. I don't really know JavaScript so I'm trying to keep it as simple as possible. I thought, as there are only a few sections, that I could just hide and display different divs with arrows that have different targets. I used two different codes to arrive at this, but doesn't seem to be working. Any ideas?
<script type="text/javascript">
$(window).scroll(function(){
if($(window).scrollTop() >= 800) {
var elem = document.getElementById("arrow");
elem.setAttribute("style","display:none;");
} else {
elem.setAttribute("style","display:inline;");
}
});
</script>

I'm not sure I understand exactly what you want to do, but your code can be simplified a bit by taking advantage of the shortcuts that jQuery provides.
//When the document is ready...
$(function(){
//Select the arrow just once
var arrow = $("#arrow");
//Attach a scroll event to the window
$(window).scroll(function(){
//See what the scroll position is
var scrollPos = document.body.scrollTop;
//When the document has scrolled to a certain point or more, hide the arrow.
//Otherwise, show it.
if(scrollPos >= 800){
arrow.hide();
} else {
arrow.show();
}
});
});
Here's a brief demo of it in action: http://jsfiddle.net/Bt35Q/

Related

How to activate elements at different points of scroll down page

I am trying to 'activate' or 'click' on different elements as the user scrolls down the page. I.e. as the user scrolls down the page, element 1 should deactivate and element 2 should activate. Then 2 should deactivate and 3 should activate. It is important that these elements get 'clicked' and not just have a CSS change.
It works on the first one (it clicks .no2 and the tab activates) but then as you scroll down, .no3 and .n04 don't click, so I assume once the first if statement is true, it no longer checks the next if statement.
Please see my code here:
<script>
$(function() {
$(window).scroll(function () {
var scroll = $(window).scrollTop();
if (scroll >= 200) {
$('.no2').triggerHandler('click');
}
if (scroll >= 250) {
$('.no3').triggerHandler('click');
}
if (scroll >= 300) {
$('.no4').triggerHandler('click');
}
});
});
</script>
You can use libraries to help you achieve it easily try AOS
https://wesbos.com/javascript/06-serious-practice-exercises/scroll-events-and-intersection-observer
Else you can use Intesection Observer
https://wesbos.com/javascript/06-serious-practice-exercises/scroll-events-and-intersection-observer

Trouble with Javascript in Wordpress

I'm trying to create an element in a Wordpress site where a piece of content begins partway down the screen, and sticks to the top of the screen when the user scrolls down.
I've tried various things, and none of them have worked. The most recent attempt uses Javascript to give and take away a class to the content I'm trying to move/fix.
The code is
jQuery( document ).ready(function($) {
alert( "test1!" );
var wrap = $("#wrap");
wrap.on("scroll", function(e) {
if (this.scrollTop > 147) {
wrap.addClass("fix-search");
alert("test2");
} else {
wrap.removeClass("fix-search");
}
});
});
The file is enqueuing properly since the first test alert ("test1" fires, but "test2" doesn't fire as I scroll down the screen. I've had that same piece of code working in a modified version of the original code on codepen (http://codepen.io/anon/pen/NqKKVN) so I can only assume this is something weird with Wordpress interacting with Javascript.
So yeah, anyone know a way to either do that I'm wanting to do in a way that will work with wordpress, or to get the above piece of code working properly?
EDIT: This has been solved. For the reference of anyone else with the same problem the piece of code that eventually worked was
jQuery( document ).ready(function($) {
var scrollTop = $(window).scrollTop();
function scrollUpdate() {
var scrollTop = $(window).scrollTop();
var wrap = $("#menu-all-pages");
if (scrollTop > 147) {
wrap.addClass("fix-search");
console.log("Menu at top");
} else {
wrap.removeClass("fix-search");
console.log("Menu at set point");
}
console.log(scrollTop);
}
window.onscroll = scrollUpdate;
});
I have implemented a similar solution in my blog a few years ago. I got it working by scripting this way:
Add a variable scrollTop which would contain the value in pixels
scrolled from the window top.
var scrollTop = $(window).scrollTop();
See, I use jquery function scrollTop applied to the selected object "window". It would return the value scrolled from the very top of the browser. It does work on Wordpress, I have tried it on my blog.
Put this code in a function scrollUpdate. We'll call it later to update
the scroll value from top
function scrollUpdate() {
var scrollTop = $(window).scrollTop();
}
The function should also contain all the logic checking the scrollTop value and thus applying styles and etc.
Let's make this function be called on every scroll.
window.onscroll = scrollUpdate;
Try it yourself!
P.S. I got a weird feeling, but you should better use hide / show instead of adding a whole css class to the page.

jQuery scroll to next element via up/down buttons - how to add handling for manual scrolling that would otherwise confuse this?

I am trying to implement two static buttons for navigating up or down between about 10 containing div tags on a single fairly deep page of content.
I want the buttons to smoothly scroll to the next part of the page (next containing div) whenever they are clicked on.
The problem with this solution is that if you manually scroll up and down the page using the browser scroll bar or the mouse wheel then the logic of the code is not aware of this and when you next click next/prev a scroll takes place that is not actually relevant to the viewable area you see, totally ruining the user experience.
You can test this in this demo: http://jsfiddle.net/aVJBY/ . If you click NEXT once it works. Now scroll down to near the bottom of the content and click PREV. In theory the page should go one step back from the bottom of the page. Instead it returns to the top of the page.
Maybe I just need to scrap this code and use some external library which is fine, but I can't find anything appropriate. Anyone have an idea on how to make my code resolve this issue?
The code I am using so far is here:
$('div.section').first();
$('a.display').on('click', function(e) {
e.preventDefault();
var t = $(this).text(),
that = $(this);
if (t === 'next' && $('.current').next('div.section').length > 0) {
var $next = $('.current').next('.section');
var top = $next.offset().top;
$('.current').removeClass('current');
$('body').animate({
scrollTop: top
}, function () {
$next.addClass('current');
});
} else if (t === 'prev' && $('.current').prev('div.section').length > 0) {
var $prev = $('.current').prev('.section');
var top = $prev.offset().top;
$('.current').removeClass('current');
$('body').animate({
scrollTop: top
}, function () {
$prev.addClass('current');
});
}
});
I resolved this with the wonderful jQuery inview plugin - https://github.com/protonet/jquery.inview An overview of what I did follows...
I first setup some variables, the pageItems array contains all the divs I need to monitor...
var posNext=0;
var posPrev=0;
var pageItems = ["pageone", "pagetwo", "pagethree", "pagefour", "pagefive"];
I then setup the following in document ready. Thanks to the inview plugin and the jQuery bind event, on a page scroll (of any kind, either by my buttons, manually or via mouse wheel) the plugin is run. I first search the array of page items for a match with what is returned by the $(this).attr("id") value. I then adjust the posNext/posPrev variables with values based on the current div in view.
$(document).ready(function (){
$(".divclass").bind('inview', function(event, isInView, visiblePartX, visiblePartY) {
if (isInView) {
matchPos = pageItems.indexOf($(this).attr("id"));
// Determine prev/next positions now we have an index. The position values used in click events later
if ( (matchPos+1)==pageItems.length ){
posNext=matchPos;
posPrev=matchPos-1;
}else if (matchPos==0){
posNext=matchPos+1;
posPrev=0;
}else{
posNext=matchPos+1;
posPrev=matchPos-1;
}
} else {
// dont update index
}
});
});
Finally also within document.ready I have binds to catch clicks on the buttons I have on screen all the time. These use a jQuery animate call to scroll to the div id value specified via the array index values in posNext/posPrev.
$(".down-button").click(function(e){
event.preventDefault();
$('html, body').stop().animate({
scrollTop: $("#"+pageItems[posNext]).offset().top
}, 500);
});
$(".up-button").click(function(e){
event.preventDefault();
$('html, body').stop().animate({
scrollTop: $("#"+pageItems[posPrev]).offset().top
}, 500);
});

Trigger Back to Top Function from within iFrame

I've been searching a lot for the solution to this and can't figure it out. Tried a lot of methods I've seen but none seen to work.
Here is what I wanna do:
I have a main page with a navigation menu on its side, and all the content is loaded on iFrame. I wan't to know when the iFrame content was scrolled down to enable or disable Back to Top Button and also send the iFrame content back to top when clicking the button.
<script type="text/javascript">
$(function() {
$(window).scroll(function() {
if($(this).scrollTop() != 0) {
$('#toTop').fadeIn();
} else {
$('#toTop').fadeOut();
}
});
$('#toTop').click(function() {
$('body,html').animate({scrollTop:0},800);
});
});
</script>
I've found this code but it is made to work on the current page you're on. I've tried a lot with document.parent, parent, trigger(), but nothing seen to work. I could paste this code on all pages that will load on the iFrame but what I want is to place the back to top button on a static button menu that I have on the top of the content so it can be seen from wherever part of the text you are.
Thanks!
Have you tried inserting this script in the iframe head? btw its parent.document not document.parent.
$(window).scroll(function() {
if($(window).scrollTop() + $(window).height() == $(document).height()) {
button = document.getElementById('topButton');
button.style.display = "block";
}
});
function toTop(){
document.getElementById('iframeContainer').scrollTop = 0;
}
and just hide the button. once the bottom is reached it should change the style to block and make it visible. Call the toTop() function with your newly visible button.

Keep clicked link in viewport when calling jQuery's slideUp function

I have the following html structure repeated multiple times on a page:
<div class="item">
<div class="header">
...
Close All Expanded
</div>
<div class="expanded">
...
</div>
</div>
And some jQuery to close all the divs with class expanded when the link is clicked:
$('.closeExpanded').click(function(e){
e.preventDefault();
$('.expanded').slideUp('slow');
});
However I want to ensure that the link you've just clicked remains in view and moves as little as possible. Currently clicking on a link halfway down the page causes the link to move up out of the viewport as divs above it are closed.
Is there a nice graceful way I can keep the link that's been clicked in the viewport?
Update:
I've tried the answers suggested so far but so far none completely work (e.g. clicking link number 30 in each of these leads to link number 30 ending up outside of the viewport)
mrtsherman's solution: http://jsfiddle.net/Qan5p/38/
Mohsen's solution: http://jsfiddle.net/Qan5p/39/
roXon's solution: http://jsfiddle.net/Qan5p/40/
You will need to modify the scrollTop property of the page to keep things in place. Fortunately, as elements are shrunk they will be triggering scroll events you can hook into.
//untested, but should look something like this
var linkPosition = null;
$('.closeExpanded').click(function(e){
e.preventDefault();
linkPosition = $(this).offset().top - $(document).scrollTop();
//in callback to slideUp clear linkPosition so that we know to stop tracking scroll events
$('.expanded').slideUp('slow', function() {
linkPosition = null;
});
});
$(document).scroll( function(){
//check to see if we should be keeping link on screen
if (linkPosition != null) {
//keep the link in position
//I'm not so sure about this bit of the code, but I think you get the idea. All you have to do
//is properly calculate the new offset to keep the link looking like it is in the same position
var newPos = $(document).scrollTop() + linkPosition;
$(document).scrollTop(newPos);
}
});
$('.closeExpanded').click(function(e){
e.preventDefault();
$('.expanded').css({
'position' : 'absolute', // make it position absolute to prevent moving
'left' : $(this).offset().left,
'top' : $(this).offset().top
}).slideUp('slow', function(){
$('.expanded').css('position', 'static');
});
});
Fiddle: http://jsfiddle.net/mohsen/Qan5p/10/
WORKING DEMO
The easiest way:
Wrap contents into dynamically generated divs.
First animate the contents,
Than animate the wrapper elements
$('.expanded').wrapInner('<div class="wrapper" />');
$('.expanded').each(function() {
$(this).height($(this).children('.wrapper').height());
});
$('.closeExpanded').click(function(e) {
e.preventDefault();
$('.wrapper').animate({height: '0px'}, 800, function() {
$('.expanded').slideUp(800);
});
});

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