So I've got an div that slides down when you scroll near the bottom of the page. In that div, I have an "X" anchor that slides it up again (this is in jQuery). But if I scroll, the div slides down again (naturally). So I want the X to first of all, make "#topDiv" slide up, and then ignore the function that makes it slideDown.
Full code:
$("#topDiv").hide();
$(window).scroll(function () {
if ($(window).scrollTop() + $(window).height() > $(document).height() - 500) {
$("#topDiv").slideDown();
}
if ($(window).scrollTop() + $(window).height() < $(document).height() - 800) {
$("#topDiv").slideUp();
}
$("#closeTop").click(function () {
$("#topDiv").slideUp();
return false;
});
});
Demo Page ( http://tutorials.underbakke.net/js/function/ )
You could use the on/off methods to unbind the slidedown after the "X" is clicked
$("#topDiv").hide();
$(window).on('scroll', showTopDiv);
function showTopDiv() {
if ($(window).scrollTop() + $(window).height() > $(document).height() - 500) {
$("#topDiv").slideDown();
}
}
$(window).on('scroll', function() {
if ($(window).scrollTop() + $(window).height() < $(document).height() - 800) {
$("#topDiv").slideUp();
}
});
$("#closeTop").click(function () {
$("#topDiv").slideUp();
$(window).off('scroll', showTopDiv);
return false;
});
Also, in your slideup function, adding $("#topDiv").is(':visible') to the if statement will make sure it is'nt executed uneccessary.
And is there really a need to bind the click function on every scroll?
Try this:
$("#topDiv").hide();
$(window).addEventListener('scroll', function(event) {
if ($(window).scrollTop() + $(window).height() > $(document).height() - 500) {
$("#topDiv").slideDown();
}
if ($(window).scrollTop() + $(window).height() < $(document).height() - 800) {
$("#topDiv").slideUp();
}
$("#closeTop").click(function () {
$("#topDiv").slideUp();
$(window).removeEventListener('scroll',arguments.callee,false);
});
}
Related
Currently I detect when I am at the bottom of the page.
I have a input hidden on the html, and when you scroll to the bottom, the input gets +1, but, when you get to the bottom, it adds alot of numbers.
How I add only +1 and it doesn't get alot of +1?
function finalPage() {
$(window).scroll(function () {
if ($(window).scrollTop() + $(window).height() > $(document).height() -500) {
loadMore();
}
});
}
var num = $("#page").val();
num++;
$("#page").val(num);
Try this:
function finalPage() {
$(window).scroll(function () {
if ($(window).scrollTop() + $(window).height() > $(document).height() -500) {
loadMore();
$("#page").val($("#page").val()+1);
}
});
}
function firstAnimation() {
$('.etc(1)').fadeIn();
}
function secondAnimation() {
$('.etc(1)').fadeOut();
$('.etc(2)').fadeIn();
}
function thirdAnimation() {
$('.etc(2)').fadeOut();
$('.etc(3)').fadeIn();
}
function fourthAnimation() {
$('.etc(3)').fadeOut();
$('.etc(4)').fadeIn();
}
$(window).scroll(function() {
if ($(this).scrollTop() > 150) {
firstAnimation();
}
if ($(this).scrollTop() > 300) {
secondAnimation();
}
if ($(this).scrollTop() > 450) {
thirdAnimation();
}
if ($(this).scrollTop() > 600) {
fourthAnimation();
}
});
Guys, i'm using scrollTop() to animate a piece of my site, and i was wondering if i can reverse the animation if o scroll to the bottom, and not to the top.
I was searching but there isn't a scrollBottom in jquery.
First, set an additional requirement for each if statement to condition each event to a scroll range to prevent multiple events from being triggered. Second, add a .fadeOut() function to the next elements so that the effect is reversed when the user scrolls the opposite direction.
The code should look like:
function firstAnimation() {
$('.etc1').fadeIn();
$('.etc2').fadeOut();
}
function secondAnimation() {
$('.etc1').fadeOut();
$('.etc2').fadeIn();
$('.etc3').fadeOut();
}
function thirdAnimation() {
$('.etc2').fadeOut();
$('.etc3').fadeIn();
$('.etc4').fadeOut();
}
function fourthAnimation() {
$('.etc3').fadeOut();
$('.etc4').fadeIn();
}
$(window).scroll(function() {
if ($(this).scrollTop() > 1500 && $(this).scrollTop() < 3000) {
firstAnimation();
}
if ($(this).scrollTop() > 3000 && $(this).scrollTop() < 4500) {
secondAnimation();
}
if ($(this).scrollTop() > 4500 && $(this).scrollTop() < 6000) {
thirdAnimation();
}
if ($(this).scrollTop() > 6000) {
fourthAnimation();
}
});
Demo on JSFiddle
To scroll to the bottom of the document, try:
$(window).scrollTop($(body).height());
$(window).load(function() {
$("html, body").animate({ scrollTop: $(document).height() });
});
I have a map on the bottom of my webpage and when a user scrolls down to the map, I want the google marker to drop and that specific time. I have this working already. The problem is that it keeps calling the function, how do I call it only once?
This is my JS code right now and I have tried to figure the bug out:
$(window).scroll(function () {
if ($(window).scrollTop() >= $(document).height() - $(window).height() - 300 &&
$(window).scrollTop() <= $(document).height() - $(window).height() - 200
) {
var dropOnlyOnce = (function(){
dropped = false;
if (dropped == false) {
dropMarker(); // this is the function I'm calling
}
dropped = true;
})();
}
});
How can I get this to work or how can I just call the dropMarker function once?
You could remove the listener once the function has been called:
$(window).on('scroll', function(e) {
if( ...window at scrollTop ) {
$(window).off('scroll')
.... Drop your pin
}
})
Esteban Felix's Comment brings up a good point. This will remove all scroll handlers. If that's not something that works for you, you can move the function outside the handler, and only remove that:
var dropPinOnce = function() {
if( ... window at correct scrollTop ) {
... Drop pin here ...
$(window).off('scroll', dropPinOnce)
}
$(window).on('scroll', dropPinOnce)
Try
var callbacks = $.Callbacks("once")
, dropMarker = function() {
// do stuff
};
callbacks.add(dropMarker);
$(window).scroll(function () {
if ($(window).scrollTop() >= $(document).height() - $(window).height() - 300 &&
$(window).scrollTop() <= $(document).height() - $(window).height() - 200
) {
var dropOnlyOnce = (function(){
dropped = false;
if (dropped == false) {
callbacks.fire() // call `dropMarker` "once"
}
dropped = true;
})();
}
});
See jQuery.Callbacks at "Possible Flags" -> "once"
var callbacks = $.Callbacks("once")
, dropMarker = function() {
console.log(123)
};
callbacks.add(dropMarker);
$(window).scroll(function () {
if ($(window).scrollTop() >= $(document).height() - $(window).height() - 300 &&
$(window).scrollTop() <= $(document).height() - $(window).height() - 200
) {
var dropOnlyOnce = (function(){
dropped = false;
if (dropped == false) {
// dropMarker(); // this is the function I'm calling
callbacks.fire()
}
dropped = true;
})();
}
});
div {
height : 500px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div>abc</div>
If you just unbind after your condition is met then your function will effectively only be called once.
$(window).scroll(function callOnceOnScroll() {
var $window = $(window),
$document = $(document);
if ($window.scrollTop() >= $document.height() - $window.height() - 300 &&
$window.scrollTop() <= $document.height() - $window.height() - 200) {
$window.off('scroll', callOnceOnScroll);
dropMarker(); // this is the function I'm calling
}
});
I want to run an alert if the viewport is wider than 1250px and if the user is near the bottom of the page.
I currently have the two snippets of code which work individually...
function checkSize(){
if ($(window).width() > 1250) {
alert('hello');
}
}
checkSize();
$(window).resize(function() {
checkSize();
});
and the other snippet which detects how far the user has scrolled down...
$(window).scroll(function() {
if($(window).scrollTop() + $(window).height() > $(document).height() - 700) {
alert('hello');
}
});
How can I combine the two in one if statement? I have tried this but it does not seem to work..
function checkSize(){
if ($(window).width() > 1250 && $(window).scrollTop() + $(window).height() > $(document).height() - 700) {
alert('hello');
}
}
checkSize();
$(window).resize(function() {
checkSize();
});
Following discussion in comments. This seems to be working:
function checkSize(){
if($(window).width() > 1250 && $(window).scrollTop() + $(window).height() > $(document).height() - 700) {
console.log('hello');
}
}
checkSize();
$(window).scroll(checkSize);
$(window).resize(checkSize);
Demo
(($(window).width() > 1250) && ($(window).scrollTop() + $(window).height()) > $(document).height() - 700)
You need to place () to show what you what to calculate!
I have the following code which gets the amount the user has scrolled from the top and the bottom and then using these values it should hide or show the shadows.
$(document).ready(function() {
if ( $(window).scrollTop() + $(window).height() >= $(window).height() ) {
$('div.shadow-bottom').show();
}
$(window).scroll(function () {
if ( $(window).scrollTop() >= 15 ) {
$('div.shadow-top').show();
} else {
$('div.shadow-top').hide();
}
if ( $(window).scrollTop() + $(window).height() >= $(window).height() - 15 ) {
$('div.shadow-bottom').show();
} else {
$('div.shadow-bottom').hide();
}
});
});
The top works fine, but the bottom one should be hiding when you get to the bottom of the page BUT then show again if you are 15 pixels from the bottom.
Example: http://dev.driz.co.uk/shadow/
$(window).height(); // returns height of browser viewport
$(document).height(); // returns height of HTML document
Change your code to:
$(document).ready(function() {
if ($(window).scrollTop() + $(window).height() >= $(document).height() - 15) {
$('div.shadow-bottom').show();
}
$(window).scroll(function() {
if ($(window).scrollTop() >= 15) {
$('div.shadow-top').show();
} else {
$('div.shadow-top').hide();
}
if ($(window).scrollTop() + $(window).height() >= $(document).height() - 15) {
$('div.shadow-bottom').show();
} else {
$('div.shadow-bottom').hide();
}
});
});
The correct working example is:
$(document).ready(function() {
if ($(window).height() < $(document).height()) {
$('div.shadow-bottom').show();
}
$(window).scroll(function() {
if ($(window).scrollTop() >= 15) {
$('div.shadow-top').show();
} else {
$('div.shadow-top').hide();
}
if ($(window).scrollTop() + $(window).height() >= $(document).height() - 15) {
$('div.shadow-bottom').hide();
} else {
$('div.shadow-bottom').show();
}
});
});
Which is based on bhb's answer above.