Never good to start off with an apology but please allow me to apologise for the terrible title of this post and also apologise for asking a question which has no doubt been asked countless times before. However, as I couldn't think of an appropriate title for this post you can image how well my searching went.
I'm looking to replicate the scrolling effect on the fitbit website where the section starts with "Get energized, take charge."
I have a rough grasp of what is happening here but don't have the smarts to piece it all together.
User scrolls page to this div.
JS calculates scroll position of this div and sets a class on the parent div which changes its state to fixed.
Child divs are now scrollable due to the change of state.
JS knows position of last child div, and when its at the top of the parent div, it removes class from parent and allows rest of the page to scroll normally once again.
I think I can calculate the second bullet point using something like
$(window).scrollTop()
And I can toggle the class on the parent easily enough. What I'm struggling to grasp is how the JS knows that the last child div has been scrolled and then organising that within the function to remove the class from the parent.
Any help would be greatly appreciated.
As a side note, I'm already using jcarousel on this project and if I could reuse existing code that would be great but I don't even know if this plugin can handle what I'm looking for.
Related
In the website I am currently creating, I am using Angular 8 (not sure whether the component paradigm has an influence on my troubles with scrollbars).
Like most websites, I need to implement a scrollbar in case the data does not fit the screen. But as I added more and more components, I realized that the way I used scrollbars was confusing and I ended up not being able to implement the behaviour I wanted.
I looked on the Internet but most ressources explain how to customize scrollbars, which is not what I am looking for. The article explaining the few CSS overflow properties were not very useful as well, because I did not have what I wanted, even though I kind of have tried every possibility (at least most I could think of).
Do you have any piece of advice to manage scrollbars ? Good practices & so on.
Currently the behaviour I am trying to implement is the following :
I have a home component containing a navbar and a router-outlet. The navbar is actually overflowing (because of box-shadow and an icon).
The router-outlet contains (if on the right page) a sidebar on the left side which represent a list of emails, and the content on the right. I don't want a global scrolling because I would have a empty space above the sidebar (where the navbar should have been but is gone because of scroll). I would need a scroll for the sidebar, and a scroll for the content.
So if you have any ressource which could help me understand how to use these scrollbars and manage them elegantly, that would be super appreciated :)
Try this perfect-scrollbar which is used for Angular 8.
The Problem:
I have a web application on the iOS homescreen so there is no browser window and it looks and functions very well. I've figured out how to make inner div elements do the touch scrolling events and use the momentum/bounce style in iOS, and that works perfectly... the issue I run into now is that the bounce scrolling (again, iOS-only) is messing up any fixed elements or site-related animations I have on the page.
When I try the following:
document.ontouchmove = function(e) {e.preventDefault()};
The issue stops, but now I can't scroll anywhere on my application.
What I Need:
I want the body to be completely locked in place... If someone grabs, say, my sidebar or navbar and then pulls on the page, the body bounces! But if someone is inside the content area, there is no issue at all--the application scrolls flawlessly and looks great. If I stop scrolling on the sidebar or navbar or body, all scrolling in the application will not working and is essentially nonfunctional.
tl;dr: Body bounces on scroll. I want a scrolling content area and no scroll anywhere else. The body should NEVER move, but elements I deem scrollable within the body should.
As a sidenote, I've browser the following popular questions/solutions posted (among many others):
1
2
3
I just wanted to post that up before people assumed I didn't do any searching... I've been at this for hours now and have seen even more solutions than posted above, but I wanted to get the most popular ones listed above so no one thought this was a duplicate question.
I figured this out a few days ago and have this handy jsbin set up to demonstrate what I did to make this work:
My Working jsbin Example
When you open this link on an iPad, the text should be scrollable. Try tugging around the rest of the screen when there is no current touchmove event currently working.
If you play around with it, you'll notice that only the inner textfield moves as expected. This is determined by putting my .scrollable class within the .container class. The .scrollable class takes up the full height of it's parent container.
Now make the container a larger height, like height: 500px. The goal here is to make it large enough to have no overflow yet small enough to have other whitespace on the iPad still. Try scrolling it or pulling it... No touchmove events are fired and the screen stays in place.
My JS determines if an object has overflow after being touched. If it does, it scrolls. If it does not, it does not send a scroll event.
Play with it and let me know if I can provide any better examples and also if you run into any bugs... Right now the only one I know of is if you're really trying to break it and start tugging around the site while a current touchmove event is being fired, or the page is first loading... I wouldn't count those as "bugs", but if you can find a fix for those too, I'm all ears!
This is a bit too tricky for my jQuery / javascript knowledge so i'm sorry to say i haven't really tried anything yet. I need some hints to get pointed in the right direction!
The problem is that i have a fixed element on my page, and when scrolling down this element will enter different wrappers, and while in that wrapper i need a smaller child element to "snap" to my fixed element and while it's in the element.
Kind of hard to explain, i made a static mockup here:
http://jsfiddle.net/ycmYc/
When "fixed cart button" reaches a price, i need it to attach and scroll with the cart button as long as it's inside the prices "product-div". When it leaves and enters the next the price should stay in the bottom of it's product and then snap to the cart-button again when the users is reaching it by scrolling up.
Well, again, sorry for not having tried anything but i am lost. If i had to do this without any help i think i'd go with waypoints.js but it feels far from optimal.
Any help MUCH APPRECIATED!
The fixed element will always have the same position, so i guess offset from the browser top could be used instead of keeping track of it's position. Always something ;)
Update:
Been working on it myself, and got it working downwards but not upwards:
Should clarify what i mean:
http://retype.se/temp/scrolltest/test.html
When scrolling by the price, it joins the button downwards and snaps loose when leaving the container. My problem now is making it snap to it and scroll back to its original position when scrolling upwards :)
Do you want it like this?
http://jsfiddle.net/ycmYc/39/
only result: http://fiddle.jshell.net/ycmYc/39/show/light/
updated:
How about this?
http://jsfiddle.net/ycmYc/93/
only result: http://fiddle.jshell.net/ycmYc/93/show/light/
this is just a brainfart, but maybe it gets things going (sry, dont have time for a fiddle). But I got the idea, of maybe trying to cheat optically.
What I mean is, to calculate the absolute positions of all price divs, hide them, and when the cart div reaches that position by scrolling, show the price div for x amount of pixel scrolling (or via z-indexes by making backgrounds, not sure what suits you better).
Hope this helps a bit, maybe I get time today to script it out.
It kinda depends on the constraints. You can detect the scroll position of a window with:
window.pageYOffset or document.documentElement.scrollTop.
If the divs are all the same size you could easily calculate which div the button is over and the position: fixed the price next to it.
McMaster-Carr, a few years back, completely redesigned their website and they now have these very cool 'scrolling box' sections for each product. I've been trying to duplicate that same effect only using css and html, but have had no luck so far.
Some key things I cannot accomplish using only html + css:
hidden scrollbars with the ability to still scroll
section headers that stop when scrolled to the top of a containing div
I've tried looking through their source code but I really want to start from scratch and recreate the effect, hopefully finding a much simpler way to recreate it.
If anyone has seen anything like this before or knows how to go about creating this type of layout, please help.
Here's a link to a page on the McMaster-Carr website that demonstrates that scrolling box layout:
http://www.mcmaster.com/#nylon-gears/=g1p46z
The technique j08691 linked to is the common way to do it - you'll have to use a bit of JS to find out where how much the site is scrolled. If you look at the source of the persistent header example, there is a line like
scrollTop = $(window).scrollTop()
simply replace this by the top position of your parent div (assuming it is, like in McMaster, fixed on the site)
scrollTop = $("div.MyParentDiv").position().top
Here is my current situation:
I have a web page containing a couple scrollable divs. Each of those divs contains a number of objects. I am using YUI to display popup menus of actions that can be performed on each object. Each object has its own menu associated with it that is constructed and displayed dynamically. The popup menus can be large and can overlap the bounds of the scrollable div.
From what I believe are issues with focus (the menus must be accessible), when I hover the mouse over an action that lies on top of an edge of the scrollable div, the div automatically scrolls, moving the content but leaving the menu stationary. Trying to move the menu dynamically when this happens is not something I want to do as I believe it would provide a poor user experience.
So I need to prevent this focused menu from scrolling the div. My idea for providing the best user interface is to prevent these inner divs from scrolling when a menu is open. This leaves the menu positioned in the optimal location to show the user which item is being acted upon. If the user wants to scroll the box, they can click to close the menu and then scroll normally.
How can I do this? I need a solution that works across the major browsers.
My first thought was to listen to the onscroll event for that particular element. Unfortunately, there does not seem to be an easy way from there to just prevent the scrolling from happening. For one, my JavaScript event code appears to execute after the actual scrolling has occurred.
Then, I thought that since my code is being run after the object has scrolled, I could just reset obj.scrollTop and obj.scrollLeft. Sure enough, this appears to work, though I am worried that on slow browsers the user will see the content inside the div "jump around". Also, it would be really nice if the amount the element scrolls is part of the event object. Is it stuck in there somewhere? I'm looking for an alternative to having to store the scrollTop and scrollLeft variables for this element and then using them while the scrolling is temporarily disabled.
What is the best way to solve this entire problem?
I agree with Anthony regarding the presentation of the functionality you're trying to disallow. If you're going to disable scrolling, then you should make that part of the page visually disabled or removed.
To that end, you can position a semi-transparent div on top of the scrollable div in question, which would capture the mouse events and visually show that the scrollable div is inactive for now. It would be hard to make cross-browser compatible and wouldn't be perfect, but then again very few client-side tricks like this are.
The simple answer is no you can't do this. Its doubly no if you want a cross-browser solution.
Providing the user with the clear affordance that something can be scrolled then denying them that is just plain poor UI design.
Ok so after your edit it turns out you are not actually trying to prevent the user from scrolling.
The main answer remains true though. It sounds as though the focus is going to rectangle (probably an anchor?) that is not fully in view and causes a scroll. Is there a reason this rectangle must get the focus? For accessibility?
What if you didn't have overflow: scroll and instead you used overflow: hidden and provided scroll up/down buttons that allowed the user to scroll when necessary? These buttons could of course be disabled easily.
Though it may not be the answer you are looking for, if you are to set the display value of the div to 'none' while the page loads (from the server) and then have an event wired to the page load (either pageLoad in ajax.net or attach it to the onload event via javascript) that will make the div display set to 'block' .. that would ensure that slower browsers wouldn't see the div 'jumping around' (could even put a 'loading' image in the div to show users it's doing something and not just invisible)
sorry i couldn't provide a more complex/fluent solution.
I found a way to work around this issue. By removing the menu element from the scrollable div and then appending it directly to document.body, the browsers all stop trying to scroll the div to reveal the focused element (even though the element is already completely visible).
Thanks to all for your time and your answers!