I've used keyframes to animate the entrance of some elements onto my page, however the elements are located at the bottom of the page, so the animation takes place before you see them.
Is there a way to stop the animation from happening until the user scrolls into view of the elements? Preferably not a jQuery solution since I am not familiar with it.
Note: I know there is a library called wow.js that solves this issue, but it uses animate.css for it's animations. This is a problem for me because I was using animate.css originally but it was overwriting/conflicting with some other css I had. That is why I switched to using keyframes for the animations, and in order to have all the properties of elements working correctly I believe I have to stay with keyframes rather than animate.css
I found my own answer! Wow.js still works because you don't have to necessarily use animate.css animations, you can still use your own custom animations.
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I have a bunch of images, say 100 images, in a web page, and only 10 are visible without scrolling the page. The first 90 images have a "myclass" class.
I manage all images with jquery lazy (http://jquery.eisbehr.de/lazy/), and it works perfecty if I scroll the window.
However, If I make $(".myclass").hide() before scrolling down, I see the last 10 images, which don't have the "myclass" class, bug jquery lazy doesn't "reveal" them.
Why?
Because lazyload triggers on scroll events.
$(window).scroll() (which triggers the scroll event on the window) is enough to solve the issue.
If the scrollable div is not the window object, use it instead of $(window).
I'm using web components in a shadow dom, and all animations work fine in Chrome. However, in Safari and thus iOS Safari, the animations on elements work fine, but not on pseudo elements. This baffles me, because it's ONLY on pseudo elements like :after and :before.
There is nothing wrong with the code, because when I run it without a shadow dom everything triggers just fine and works perfectly in all browsers.
Why is this, and how can I remedy this problem?
I've tried setting important on the animation css, didn't work.
Tried moving #keyframes higher up in the shadow dom, didn't work.
Tried including the #keyframes in the document that includes the shadow dom, this worked.
However, I'd prefer not to solve it like this because then I have to include a shared animation css asset in both the main document and the document that is meant to be included via shadow dom. And it's still weird that the normal animations work, but not pseudo elements. The pseudo elements are there, the ONLY thing lacking is that the animation doens't trigger.
I watched this presentation and there's a section on how to build an IOS Maps like UI. When dragging from the bottom to top, it drags to the top, and after it reaches the top, it continues scrolling up. Also, when scrolling down, when it reached the top content of the ScrollView, it continues to drag down.
It is suggested that it can be done using ScrollView by adding an empty transparent cell as the first element on the ScrollView. I have tried implementing the same which can be found in this snack. In my case, instead of Maps, I am using another ScrollView.
But the problem is that the first element (transparent element) does not allow to interact with the First ScrollView elements. I have tried with pointerEvents inside the first transparent view and even in its parent ScrollView. But this does not help. Has anyone tried implementing this kind of use case with react-native? All I found was this library, but I think it's not maintained properly.
you need to set the z-index of the transparent view to send it under/behind the interactive content, here is a good resource:
https://philipwalton.com/articles/what-no-one-told-you-about-z-index/
Edit: Actually I could not accomplish it, it seems like everything inside a scrollview will always be behind or in front of other elements, it seems like you can't have part of the scrollview behind something else and another part in front of something else.
I would like to create a carousel that scrolls automatically until the user scrolls / touches the ScrollView itself.
The auto-scrolling itself works fine with using scrollView.scrollTo but how could I detect if the user is interacting with the ScrollView? I took a look at the onScroll event but this does not seem to distinct between a user generated event and an event that was generated by calling scrollTo.
Also I'd like to know if it is possible to get the current scroll position from the ScrollView directly instead of reading it everytime from the onScroll event.
I'm very thankful for any tips and suggestions.
By digging into ScrollView's source code you can notice a few undocumented callbacks that will help you achieve what you're after, namely onTouchStart and onTouchEnd. These two callbacks are triggered only when user interacts with the ScrollView and not when you scroll programmatically.
You will probably want to clear your auto-scroll interval on onTouchStart and restart it after a delay on onTouchEnd.
Regarding your next question, the answer is no. As far as I know, no getter is currently exposed to retrieve the current scroll position. Therefore, you need to rely on the event passed to onScroll, retrieve event.nativeEvent.contentOffset['x' or 'y'], and store it in your component's state.
Note that if you're doing some heavy animations that need to follow scroll position closely (e.g. animated header or parallax image), it would be a good idea to use the native driver for Animated.event. You can learn more about it on React Native's blog.
I'm having some issues with a website that only occur in Safari. I'm running version 5.1.7 (7534.57.2) on a Mac.
You can view the site here: http://mcad.edu/annual-report-2011-12/.
The website is parallax scrolling, with a relative positioned content div that holds everything, including the 3 parallax scrolling backgrounds which are all fixed, top and left set to 0.
Within the fixed parallax background containers, colorized images fade into full color images when a user mouses over them. For each "image", there are two divs stacked, each with background images that are positioned by background-position. The div on the bottom has the colorized image. The div on top has the full color image as a background and has its opacity set to 0 until mouseover. The fade is achieved using a CSS transition on the opacity property so that the top div becomes visible.
So, in Safari only, when I mouse over any of these divs, the transition occurs smoothly but all of the content in the same parallax scrolling background div shifts/jumps in the process. If I remove the CSS transition, this does not occur.
I think that it might have something to do with the transition/webkit-transition property not playing nicely with a fixed position container in Safari. However, all of the issues I've found that relate to that are from 2010 and mention a Safari bug that I assume has been fixed…two years later. But maybe not.
There's also another issue with the Catalyst section (3rd dot down on the right navigation). These animated images work as links in Chrome, Firefox and Opera, but not Safari. Any ideas?
I have a similar issue with a fixed position and transition-duration for a header menu I've created. When a visitor scrolls down, the menu has a box shadow that fades into place. Well when this is viewed on safari in a MacOS, I get a weird sliding in issue. To easily fix this, after spending way to much time searching for answers, I'm removing the transition effect for macs. This fixes the slide in issue but gets rid of the transition effect sadly.
So as you were speculating, it probably is the transition duration on your project as well. The best thing for this would probably be to make a Mac-Safari CSS file, get rid of the transition-duration for that particular area and move on with your project.
Best I can suggest for now. Hope it helps.