Category Archive Header add class scroll

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Header add class scroll

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So basically I'd like to remove the class from 'header' after the user scrolls down a little and add another class to change it's look. I'd suggest not removing that class and adding a new CSS class on top of it for styling purposes.

Is this value intended? This means it's happening from 0 toand not and greater. In the original post you said "after the user scrolls down a little".

How TO - Resize Header on Scroll

In a similar case, I wanted to avoid always calling addClass or removeClass due to performance issues. I've split the scroll handler function into two individual functions, used according to the current state. You'd probably want to throttle handling scroll events, more so as handler logic gets more complex, in that case throttle from lodash lib comes in handy.

And if you're doing spa, keep in mind that you need to clear event listeners with removeEventListener once they're not needed eg during onDestroy lifecycle hook of your component, like destroyed for Vue, or maybe return function of useEffect hook for React. So instead use the following. Learn more. Ask Question. Asked 7 years, 6 months ago.

Active 6 months ago. Viewed k times.

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Trying to figure out the simplest way of doing this but I can't make it work. Lucky Active Oldest Votes. Well I can add position:fixed to the darkHeader class, that was my intention anyway. Problem now is that I can't get it to swap them back again after the user scrolls back up.

That's because you removed the class from the selector. You can cache the header easily, sec while I update the fiddle. Thanks, Fab, my way works too, but is that a silly way to do it? It's a nice way to don't store any unnecessary vars but queries the DOM every time you scroll the page. Thanks for your help, I think I'll use yours.

Marc Marc 31 1 1 bronze badge. Its my code jQuery document.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 did not really get point 3, but you have to measure it. Open Chrome and a console as a separate window and type out the current status, like this:.

Taken into account the comments to the answer I have decided to take a closer look at the fiddle. I understand Mike States, as he wants to solve point 3, but unfortunately it is still unclear for me, but given the fact that he asks so nicely and so consistently for a solution to that problem, I have made a guess.

Please, let me know if there is anything wrong with my guess. Everything was written based on your fiddle. How are we doing? Please help us improve Stack Overflow. Take our short survey.

header add class scroll

Learn more. Asked 6 years, 5 months ago. Active 6 years, 5 months ago. Viewed 2k times. I'm trying to create the following functionality with conditionals In addition, if the user scrolls and stops before the bottom, then scrolls back up 30px toward the top, 'state-nav-is-visible' replaces the hidden tag.

The following below ONLY accomplishes 1. Any ideas? Mike States Mike States 11 4 4 bronze badges. Check here: jsfiddle. Thank you for the reply. I'm new to coding, but could you take a look and let me know if I'm off to the right start?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. So basically I'd like to remove the class from 'header' after the user scrolls down a little and add another class to change it's look. I'd suggest not removing that class and adding a new CSS class on top of it for styling purposes. Is this value intended? This means it's happening from 0 toand not and greater. In the original post you said "after the user scrolls down a little".

In a similar case, I wanted to avoid always calling addClass or removeClass due to performance issues.

I've split the scroll handler function into two individual functions, used according to the current state. You'd probably want to throttle handling scroll events, more so as handler logic gets more complex, in that case throttle from lodash lib comes in handy.

And if you're doing spa, keep in mind that you need to clear event listeners with removeEventListener once they're not needed eg during onDestroy lifecycle hook of your component, like destroyed for Vue, or maybe return function of useEffect hook for React.

So instead use the following. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. Ask Question. Asked 7 years, 6 months ago.

053 highlighting active section menu item on scrolling

Active 5 months ago. Viewed k times. Trying to figure out the simplest way of doing this but I can't make it work.

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Lucky Active Oldest Votes. Well I can add position:fixed to the darkHeader class, that was my intention anyway. Problem now is that I can't get it to swap them back again after the user scrolls back up.

Scroll-Then-Fix Content

That's because you removed the class from the selector. You can cache the header easily, sec while I update the fiddle. Thanks, Fab, my way works too, but is that a silly way to do it? It's a nice way to don't store any unnecessary vars but queries the DOM every time you scroll the page.

Thanks for your help, I think I'll use yours. Marc Marc 31 1 1 bronze badge.Here's a secret: You may not need scroll events in your next app. Using an IntersectionObserverI show how you can fire a custom event when position:sticky elements become fixed or when they stop sticking.

All without the use of scroll listeners. There's even an awesome demo to prove it:. An event is the the missing feature of CSS position:sticky.

One of the practical limitations of using CSS sticky position is that it doesn't provide a platform signal to know when the property is active. In other words, there's no event to know when an element becomes sticky or when it stops being sticky.

Wouldn't it be nice if the browser told when the elements hits that mark? Apparently I'm not the only one that thinks so. A signal for position:sticky could unlock a number of use cases :. With these use cases in mind, we've crafted an end goal: create an event that fires when a position:sticky element becomes fixed. Let's call it the sticky-change event:.

header add class scroll

The demo uses this event to headers a drop shadow when they become fixed. It also updates the new title at the top of the page. Let's get some terminology out of the way so I can refer to these names throughout the rest of the post:. To know which header enters "sticky mode", we need some way of determining the scroll offset of the scrolling container. That would give us a way to calculate the header that's currently showing.

However, that gets pretty tricky to do without scroll events : The other problem is that position:sticky removes the element from layout when it becomes fixed.

So without scroll events, we've lost the ability to perform layout-related calculations on the headers. Instead of scroll events, we're going to use an IntersectionObserver to determine when headers enter and exit sticky mode. Adding two nodes aka sentinels in each sticky sectionone at the top and one at the bottom, will act as waypoints for figuring out scroll position. As these markers enter and leave the container, their visibility changes and Intersection Observer fires a callback.

The sentinels are positioned at the top and bottom of each section.

header add class scroll

Intersection Observers asynchronously observe changes in the intersection of a target element and the document viewport or a parent container. In our case, we're observe intersections with a parent container.Learn Development at Frontend Masters. A reader sent me in a GIF showing off a cool effect they saw on Google on mobile. Presumably the homepage you see when you launch Chrome on Android? OH: I'm a mobile web developer, so I basically spend all day getting requests for content to stick to the top after some scrolling.

Little choppy, but the idea is there:. All we do is think of and design for the two different possible states:. We toggle between them simply by changing a class name. There is no trickery with having two search forms that reveal themselves in different scenarios. Much easier to just move a single one around. The trick here is applying that class at just the right moment. In our little demo, we can just test for when that perfect moment would be and hard code that into some JavaScript watching for scrolling.

If the page has scrolled down pixels or more, it will have that class applied. Even if you go down and come back up the class will go away because this little function gets called on every scroll event. This is the kind of thing that would be sweet to do in CSS alone. Note that this demo relies on fixed positioning, which has a sketchy history on mobile. Some reading:. There are a lot of magic numbers in this demo.

Anytime you are setting heights there should be some warning flags happening up in your brain. In this demo, if that centered image in the header changed height, it would look weird pretty much no matter what.

Even if you fixed the header to look right after a change, the JavaScript has corresponding magic numbers for when to change state. Perhaps some version of using waypoints or the concept of it could make a more bulletproof system.

Dzmohaipa ios

Frontend Masters is the best place to get it. On iOS 7 and less yep, the event is only triggered at the end of the scroll. Not on Chrome for Android, and not on iOS 8 have to test for the last one. Remy has a couple of good functions for debouncing and throttlingthe latter is useful for resizing for example. Here is the link. Worked very well on iOS7, but not on iOS6. Looks good.

Three-State Version. I like it. Forked you : same idea, but with an intermediate top position so I could ease the transition to its fixed position.Look for folder start.

In the index. The first is a header that contains the main photo and heading text. Beneath this we have a longer article. The idea is to check, as the page is scrolled, for any special elements we want to animate. If any of these special elements are visible, we can give them a special class and use CSS to animate or transition them into view.

This is in the javascripts folder. This might work in some ways, but sadly this has a couple of big problems. The first being efficiency.

How TO - On Scroll Header

When scrolling, the console. It could very easily slow things down and make our animations janky. A second issue is iOS.

Scrolling on some phones only results in this scroll trigger being fired after the scrolling has finished. Thankfully requestAnimationFrame solves these issues. This will look for all elements with class show-on-scroll and return them as an array we can loop through.

We begin by setting up the function loop.

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We do this using the forEach method. We need to kick it off by calling the loop function. Just to run through this quickly. It begins by checking to see if jQuery is defined. Next it uses a handy method called getBoundingClientRect. This is the rectangle around the element we want to check.View Demo Download Source There are many websites around using a simple technique where a custom CSS class is added to the navigation item when the page is scrolled to the item section.

You may use it to improve the user experience on your website and make it easier for the visitors to know where exactly they are on the website or you can also find it useful if you want to track the visitor flow and do something else based on the way they browse. For the purposes of this tutorial we are going to use a simple menu example. You can notice that while scrolling the page or if you click on any menu item, the active link text will smoothly change to blue.

Feel free to modify the code and build upon it when integrating it on your project. View Demo Download Source Happy coding. Tags: active jQuery menu navigation scroll sticky Subscribe Let's get in touch If you found this post useful, you can subscribe and I will send you an email once a month with latest posts and tutorials. Sep 14, Stan Kostadinov. Tags: active jQuery menu navigation scroll sticky. Let's get in touch If you found this post useful, you can subscribe and I will send you an email once a month with latest posts and tutorials.

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Kazirisar Posted on10:12 pm - Oct 2, 2012

Ich empfehle Ihnen, in google.com zu suchen