jQuery - smart hovering plugin - javascript

Hover events are playing an important role in the navigation of my web page, and I don't want the user to get distracted by triggering them accidentally.
I'm aware of hoverIntent, which doesn't fire a hover event until the mouse has slowed down sufficiently. However, it always fires a hover event when the user scrolls down and lands atop the element.
Google Images manages to solve this quite beautifully: it doesn't fire hovers when scrolling down, and additionally even jerking the mouse a tiny bit after scrolling into an element doesn't trigger a hover.
Is there any plugin out there that implements hovering behavior similar to Google Images?

Maybe with this will help: http://james.padolsey.com/javascript/special-scroll-events-for-jquery/
So you will know when the user is scrolling, so you will also know not to fire the hover-event.

Related

How to stop user input interrupting "ScrollIntoView" whilst in progress

Context
I am creating a site where there are sections stacked in rows, and each row takes up the full viewport.
I don't want the site to be scrollable normally, and would instead like the site to "snap" to the bottom of each section, so that I can then play out the animations taking up the full view port.
Issue
I took the approach of listening to scroll events, and then triggering a nextsection.ScrollIntoView when the user had scrolled far enough to snap to the next view.
This doesn't work well though, as the ScrollIntoView is interupted by user scroll activity, including the latent scrolling of the mouse that hangs around for about 300ms after you've scrolled.
I managed to get it sort of working by using a setTimeout(scrollIntoView(), 400), but this takes too much time and relies on the user not interacting with the site after scrolling.
I made a CodePen (here) showing the type of setup I'm working with, however to see the issue you need to open it as a webpage itself, as CodePen doesn't perform a smooth animation when using ScrollIntoView and just jumps there.
I need a smooth and uninterruptable animation as the site switches from one section to another, but as of yet I've found no working ways to implement this.
Thanks for any answers.

Javascript mouse scroll delta

is there any way to enhance scroll functionality in javascript to force it to scroll vertically to specific element when user uses mouse wheel to scroll?
just want to implement functionality like single page applications have.
Yes there is. You can listen for the wheel event, which will be triggered when the user scrolls. You can then prevent the default action to stop the window from scrolling and implement whatever you want the page to do on scroll.

jQuery Hover/Click event on same DIV (Mobile Devices)

I've written a simple script that displays circles over an image.
When you hover over a circle it expands to a tooltip.
$('div.tooltip').live({mouseenter:function(e){
... animate tooltip open;
},mouseleave:function(e){
... animate tooltip closed;
}});
When you click on the open tooltip it displays a lightbox with more information.
$('div.tooltip').live('click',function(e){
... open related lightbox
});
Everything works as it should, except on mobile devices. When I tap the circle to open the tooltip it fires the click event and completely bypasses the mouseenter/mouseexit events.
Any ideas would be greatly appreciated :) Thanks
Because of the nature of touch screen devices they dont support hover events at all. The best you could do in this regard is use a jquery plugin that supports gestures and use the single-tap and double-tap events, otherwise you would need to place the tooltip somewhere else and make it visible always or have a separate button that solely activates the tip... or you could make it so the first click activates the press and then the next click activates the second function.

Javascript: don't stop scrolling window if the cursor passes over a scrollable div

I'm building a web app that has a grid of many small scrollable divs (actually, Ace editors), and this grid has enough elements that it is larger than the window. When a user begins scrolling over empty space, I want them to be scrolling the window itself; when a user begins scrolling inside a grid element, I want them to scroll the div contents there. The thing is, if a user begins scrolling over empty space, and then scrolls such that their mouse goes over a grid element, that scrollable div captures all the scrolling events, interrupting the user's flow over the grid and "trapping" them inside the grid element.
I can't manually capture onmousewheel events, since AFAIK there's no way to capture horizontal mouse wheel movement separately from vertical, and I want users on Mac OS X to be able to scroll in all directions. I've thought about using JS to add an invisible div with a very high z-index on the first onscroll event, and removing it as soon as onscroll events aren't triggered for a certain period of time. Haven't yet coded this up, but I'm wondering if there's a better solution, or if there are any potential pitfalls that I haven't thought of. Any help or advice would be great! Thanks!
I think a solution for this would be incredibly difficult due to browser support, and the actual solution, which would probably be something like calculating the scroll, backtracking the div, and applying the scroll to the page.
You could do something like this:
$('div').scroll(function(e){
// figure out how much it has scrolled
window.scrollBy(0,howmuch);
});
I don't recommend this solution in the slightest though, I think the better option would be to set the divs to overflow:hidden; and pick up a solid scroll plugin, and use that to customize the scroll behavior on the divs.

How can I temporarily prevent a scrollable div from scrolling?

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!

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