Jquery detect scroll

Learn how to determine the direction in which the user is scrolling. This can be useful to show a sticky navigation menu when scrolling back to top, or showing a popup when scrolling down to a specific part of the page. Using the same technique we will also look at how to detect the horizontal scroll direction. The idea behind it is very simple, we keep record of last scroll and compare it with the current scrolled position, updating it as we scroll around.

Consider the code below:. Notice how the last scroll position lastY is initialized to initial window scroll position. This is so because at times when a web page is refreshed or a link to the page makes it scroll to a certain element on the page, this code will take that into account when determining the scroll direction.

To detect horizontal scroll direction we just need to make a few changes to the vertical scroll direction code:. If we were to detect both horizontal and vertical scroll on a web page, we can combine the code for horizontal and vertical scroll direction like so:. In all the code snippets above we're checking for the scroll direction on the browser window, we can use the same code to detect scroll direction of any element on the page that is scrollable. To do that we need to simply:. Available in two colors, black and white, the "keyboard keys" PNG images are ideal for screen media projects.

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All Rights Reserved. Website built with BitFrame Microframework. Latest tutorials scripts templates graphics audio. Find out the vertical and horizontal scroll direction of the document window and other elements on the page By Daniyal Hamid June 21, Comments. Share Facebook LinkedIn Twitter. Detect Vertical Scroll Direction The idea behind it is very simple, we keep record of last scroll and compare it with the current scrolled position, updating it as we scroll around.

Set CSS widthheight and overflow properties on the element to make it scrollable. Have enough content to make the element scrollable. Duis lobortis magna vel libero semper, nec auctor turpis semper. Fusce sed purus vel massa fermentum cursus. Donec interdum commodo libero non sodales. Proin quis luctus ligula, ac laoreet tellus. Quisque non ante dictum, rhoncus odio eu, mattis enim.

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jquery detect scroll

Fusce ut nunc ut odio laoreet rhoncus dictum in mauris. Suspendisse lobortis venenatis nisi, in accumsan nisl.One of the projects I recently worked on required me to not just detect how much the user has scrolled the page in terms of an absolute value ie: pixelsbut also, as a percentage of the total scrollable length of the document. In this quick tutorial, we'll see how to do all of the above, using plain JavaScript, and for the jQuery addict, using that library as well.

Lets get started! To detect how much the user has scrolled the page vertically in terms of pixels from the very top, in JavaScript, we would probe either window.

To determine how far the user has scrolled as a percentage of the total document, we need to first find out what the total scrollable length of the document is.

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On a page with no scrollbars for example, that length is 0, while for longer pages, that length is basically represented by the white part inside the browser scrollbar UI:. So first thing's first before.

To get the total scrollable area of a document, we need to retrieve the following two measurements of the page:. To get the height of the browser window in JavaScript, use window. For retrieving the height of the entire document in JavaScript, parts of which may be hidden behind the browser frame, we need to examine multiple properties and select the largest value out of the bunch. This is due to inconsistencies in some browsers when it comes to interpreting the height of a document with no vertical scrollbar- what we want in this case is simply the window's height, though some browsers ie: Mobile Chrome in Android will return the height of the content contained inside the document instead.

To get the desired document height across the board, we can use James Padolsey's function for that:. We have all the pieces now for determining how much the user has scrolled in terms of percentage. First up is the JavaScript version- we'll attach all our code to window's onscroll event to see the output change as the user scrolls:.

Move your eyes down to the trackLength variable, which gets the total available scroll length of the document. The variable will contain 0 if the page is NOT scrollable.

The pctScrolled variable then divides the scrollTop variable amount the use has scrolled with trackLength to derive how much the user has scrolled percentage wise. Running code inside window's onscroll event can be an expensive affair, as the code is often invoked many times per second as the user obliviously scrolls.

Looking at our code for getting how many percent of the page the user has scrolled above, here's a couple of optimizations we can perform:. Cache the winheightdocheightand trackLength variables' values, and only refresh them when the page has resized, instead of each time the page is scrolled. Throttle the code inside window onscroll so they are executed only once per a certain period ie: millisecondsusing JavaScript's setTimeout method.

Detecting how much the user has scrolled forms the basis for many interesting effects, such as parallax or opt-in boxes that only pop up when you've reached the bottom of the page. We now have the essential parts to implement these effects ourselves. Copyright c JavaScript Kit. Determining how much the user has scrolled the page using JavaScript or jQuery Created: Jan 22nd, One of the projects I recently worked on required me to not just detect how much the user has scrolled the page in terms of an absolute value ie: pixelsbut also, as a percentage of the total scrollable length of the document.

Detecting the number of pixels the user has scrolled To detect how much the user has scrolled the page vertically in terms of pixels from the very top, in JavaScript, we would probe either window. On a page with no scrollbars for example, that length is 0, while for longer pages, that length is basically represented by the white part inside the browser scrollbar UI: So first thing's first before. To get the total scrollable area of a document, we need to retrieve the following two measurements of the page: The height of the browser window The height of the entire document By subtracting 1 from 2, we get the total scrollable area of the document.

Looking at our code for getting how many percent of the page the user has scrolled above, here's a couple of optimizations we can perform: Cache the winheightdocheightand trackLength variables' values, and only refresh them when the page has resized, instead of each time the page is scrolled. End of Tutorial.Note: This post references a design of this site that is no longer applicable.

Instead the code will now update the header background color and box-shadow instead. When I was working on redesigning the side-navigation for this site, I wanted to add some color to it without making it distracting while reading posts. I decided that the white background was great during reading because it lets the eye focus on the blog content, but visually it leaves something to be desired.

I love the look, but I still find it distracting while reading. So I know it needs to be less distracting while reading, but how do you determine if the user is reading?

Well, they scroll. The first thing you have to do is detect when the user is scrolling the page. Because this event can potentially fire hundreds, if not thousands of times during a normal scroll, be careful not to do any heavy processing in it. The above code binds the scroll event to windowmeaning it will fire any time the page scrolls.

If you want, you can bind this event to any element that may scroll independently from window such as a textarea or a particular div. Once you know the user has scrolled you can detect whereabouts on the page they are. For the purpose of this blog, I needed to know whether or not they were at the top of the page. Using the scrollTop method you can determine if they have scrolled down the page. You can see this in action by scrolling up and down this page.

When you are at the top, the side-navigation header lights up. When you scroll down, it goes opaque. In addition to scrollTopyou can also make use of scrollBottomscrollRightand scrollLeft. This significantly reduces the amount of processing required during scrolling, and is very important to maintain a smooth UX. Blog Contact. Update: August 10, Note: This post references a design of this site that is no longer applicable.

Detecting Scroll Events The first thing you have to do is detect when the user is scrolling the page. Detecting the Scroll Offset Once you know the user has scrolled you can detect whereabouts on the page they are.

Let me know if this post was helpful on Twitter kylewbanks or down below, and follow me to keep up with future posts!In this post we will look at a way of detecting end of scrolling in an HTML element. This is done my apps to insert more content to the page using AJAX when user have finished reading the present content. Its widely used in Phonegap apps. It includes visible and non-visible region due to overflow hidden or scroll of the element. Similarly check Element.

It includes the border and padding also. Similarly check out Element. Similarly Element. Otherwise its set to 0. This properties is set to the number of pixels the content of an element is scrolled upward. It includes border and padding also. Similarly check window. If none of its parents have their position property set than offsetParent is set to body element.

When an HTML element is scrolled this event is triggered. For more info chick here. This function is used to scroll window using Javascript for a specified number of pixels. For more info click here.

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Also check window. Use window. Otherwise use window.

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Thank you for sharing this. Never thought it was this easy. Nice job, mate. Instead of blocking the entire site, a more discreet banner explaining your position regarding ads would be much more effective, and would result in a higher likelihood of being whitelisted.

How To Determine The Scroll Direction Using JQuery?

Do Not Send Email Notifications. I am a full-stack web developer. I specialize in Blockchain and JavaScript. This is my personal blog where I write about programming and technologies that I learn and feel interesting to share. Home QIdea QTrack. View Demo Before we get into the implementation you need to learn some Javascript variables and functions. For more info chick here window. Apr 20, Narayan Prusty.

Topup Philippines. Leave a Reply Cancel reply. Image 6 years ago 3 Comments Web Development page endscrolling. Share this 0.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You can do it without having to keep track of the previous scroll top, as all the other examples require:. But if you specifically listen for a mousewheel event by using bind, the originalEvent attribute of the event parameter to your callback contains different information.

Part of that information is wheelDelta. If it's positive, you moved the mousewheel up.

Detecting Scroll Events and Getting the Current Scroll Offset with jQuery

If it's negative, you moved the mousewheel down. My guess is that mousewheel events will fire when the mouse wheel turns, even if the page does not scroll; a case in which 'scroll' events probably are not fired. If you want, you can call event. Here's a way to avoid any global variables fiddle available here :.

There could be 3 solution from this posting and other answer. I checked that side effect from IE 11 and IE 8 is come from if else statement. So, I replaced it with if else if statement as following. From the multi browser test, I decided to use Solution 3 for common browsers and Solution 1 for firefox and IE I referred this answer to detect IE I understand there has already been an accepted answer, but wanted to post what I am using in case it can help anyone.

jquery detect scroll

I get the direction like cliphex with the mousewheel event but with support for Firefox. It's useful doing it this way in case you are doing something like locking scroll and can't get the current scroll top. The scroll event behaves oddly in FF it is fired a lot of times because of the smoothness scrolling but it works.

Note: The scroll event actually is fired when dragging the scroll bar, using cursor keys or mousewheel. Note: The wheel event is fired only when using the mousewheel ; cursor keys and dragging the scroll bar does not fire the event. I read the document and the example: Listening to this event across browser and after some tests with FF, IE, chrome, safari, I ended up with this snippet:. In case you just want to know if you scroll up or down using a pointer device mouse or track pad you can use the deltaY property of the wheel event.

I have seen many version of good answers here but it seems some folks are having cross browser issues so this is my fix. I haven't tested it in safari as I use windows typically. Keep in mind I also use this to stop any scrolling so if you want scrolling to still occur you must remove the e. Remember : You're user must update their system and browsers for security reasons. Inthe excuses of "I have IE 7" is a nonsense.

We must educate users. Use this to find the scroll direction. This is only to find the direction of the Vertical Scroll. Supports all cross browsers. I'm using chromium and I didn't checked on other browsers if they have the dir property.Tip: use the CSS overflow style property to create a scrollbar for an element.

Toggle between class names on different scroll positions - When the user scrolls down 50 pixels from the top of the page, the class name "test" will be added to an element and removed when scrolled up again. Slide in an element when the user has scrolled down pixels from the top of the page add the slideUp class :. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. In JavaScript: object.

In JavaScript, using the addEventListener method: object. Example Toggle between class names on different scroll positions - When the user scrolls down 50 pixels from the top of the page, the class name "test" will be added to an element and removed when scrolled up again. Example Slide in an element when the user has scrolled down pixels from the top of the page add the slideUp class : window. HOW TO. Your message has been sent to W3Schools.

Vanilla JavaScript Slide In on Scroll - #JavaScript30 13/30

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jquery detect scroll

UiEvent if generated from a user interface, Event otherwise.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am having trouble with jQuery functionality on my website.

What it does, is that it uses the window. The problem is the. You can extract the scroll position using jQuery's. Store the value of the scroll as changes in HiddenField when around the PostBack retrieves the value and adds the scroll. How are we doing?

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Please help us improve Stack Overflow. Take our short survey. Learn more. How to detect scroll position of page using jQuery Ask Question. Asked 6 years, 9 months ago. Active 5 months ago. Viewed k times. But I am not sure how to detect scroll position using jQuery? AshNaz87 11 11 bronze badges. Maven Maven Active Oldest Votes. Ivan 6, 3 3 gold badges 19 19 silver badges 50 50 bronze badges. Konstantin Dinev Konstantin Dinev Attaching events to window scroll is a bad idea : see stackoverflow.

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Listening to window scroll isn't bad in and of itself. It's when people try to do things on each firing of that event that trouble occurs. You should consider debouncing when working with this kind of events. See davidwalsh. As you already have event in function as argument you can get the same data from event. You are looking for the window.


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