When you use html5 drag&drop and drag element into a scrollable area, some browsers (and Chrome among those) scroll the area automatically for you, as long as you hold the mouse cursor near scrollable area's edges.
However, this auto-scroll is not configurable in any way - and as such, I have customer complaints about auto-scrolling through large area being very slow.
I implemented nice custom scrolling in pure JS, but problem is - I can't disable built-in drag&drop scrolling! And when I run my custom JS code together with built-in scrolling, it behaves quite unnaturally (custom scroll overlaps with built-in scroll).
Is there a way to disable this "feature" (in pure JS)?
Related
How can I add mouse scroll option in my angular app similar to what's present for touch screen devices in which you scroll via holding screen alongside some left or right swipe movement. How can I implement similar scroll technique using mouse so that user can click at some empty area than while holding down the click move mouse in a specific direction to scroll respectively.
Similar to what's available for trello.com:
I would prefer to implement this behavior using pure CSS as chrome's inspector tools also provides this feature while testing site's responsiveness for different screen sizes. So if its possible via CSS it would be great.
If it won't be possible via CSS then I would like to implement using JavaScript or TypeScript.
You could use this library: http://hammerjs.github.io/. It covers a large range of gestures you might be interested in.
I’m looking for a library that provides mobile panning and zooming gestures on content within a div. The div itself should have a fixed width and height, but its content can exceed its size which means it must support overflow scrolling. Overflow scrolling using a pan gesture should work for all zoom levels.
I only need to support browsers on modern touch devices, e.g. iOS 9+.
The webpage itself has its zoom/pan disabled via a meta tag attribute so zooming/panning will be done only within divs.
I looked at svg-pan-zoom, jquery.panzoom, and a few others like them, but I only found libraries that support images. I need a library that supports arbitrary HTML content.
This links to a library that can help: http://www.jqueryscript.net/zoom/jQuery-Plugin-For-Panning-Zooming-Any-Elements-panzoom.html
I assume you want the zooming to be done with buttons, though if you wanted to do something like zooming with the scrollwheel this might be able to handle that too. Also works with any element (including divs)
Before you say this isn't possible, I know it is. Here's an example: http://victoriabeckham.landrover.com/INT
The main problem is that iOS freezes DOM manipulation on scroll, so you have to use some sort of technique to overcome the problem. The parallax plugin I was hoping to use is stellar.js, but the issue I am running into is that the "iOS demo" for that plugin isn't really usable on a desktop. I fiddled with it for 3 hours this morning, and couldn't get a setup that works correctly on both iOS and desktop.
I need some ideas, either a technique to configure stellar.js to work the same way on both (I'm not sure if that's possible), or another library that works on both, or maybe some insight on how I could program a workaround myself.
Any help is appreciated.
Step 1: Create and object like this
{
startFrameNumber: {
//first obj
id: idOfElement
duration: howeverManyFrames
startLeft: whatever
endLeft: whatever
startTop: stillWhatever
endTop: whateverAgain
},
nextStartFrameNumber: {
}
}
Step 2: Make the page unscrollable via CSS, ie 100% height and width with and overflow: hidden
Step 3: When the user scrolls (via custom scrollbar, keyboard action, or touch events) advance the animation x frames based on how far they scrolled or whatever. If your animation object you created has a key [frame] then add that to the queue of things that are visible and moving, and move all those things in the queue to their appropriate places and/or remove them from the queue of active objects
That's it. The function for moving things around should be pretty straight forward, except getting the animations smooth will take a little playing around with.
Simply scroll each layer of parallax effect manually and control them yourself without relying on browser's page scrolling.
I've successfully implemented cross device/browser parallax scrolling with the help of the Zynga Scroller js library.
It takes care of one of your main concerns which is the interoperability of click and touch events and scrolling on mobile webkit devices – this allows you to manipulate the DOM as you scroll.
Then, to create the parallax effect you have three options:
Simulating a real-world 3d parallax by using 3d transforms (with a parent/wrapper element that controls perspective and transform origin).
Using a 2d parallax library such as stellar.js or skrollr
Building your own parallax scrolling algorithm.
Here's a quick demo (using existing sample code) of option 1 showing how smooth parallax scrolling would work across desktop and mobile devices. Of course, you're limited to devices that have support for 3d transforms. Note that the Zynga Scroller works via click/touch and drag – it should probably not be used as a dekstop solution as the only thing that would be required is overflow: scroll in CSS.
Have a look at the jQuery-Plugin "Scroll Path" http://joelb.me/scrollpath and combine this with different layers and speeds. You will have recognized that the scrolling of the example page is not just a vertical parallax stage but also moves layers horizontally while you scroll up and down. This is possible with Scroll Path.
Try using http://cubiq.org/iscroll-4 and stellar.js together.
Do your parallax stuff for desktop normally and then add a 'touchmove' Event Listener to fire the scroll event:
document.body.addEventListener('touchmove', function(){$window.scroll()}, true);
Tested and working on iPad 2 with iOs 5.1.1
how to use javascript to drag&drop the div for touch screen(not iphone or ipad.It owns traditional browser like IE6 but operate by fingers)？
on that device,fingers==mouse?
I used onmousedown/onmousemove for traditional page,but will it still work on that touch screen?
the code can still well work?if not,how to use it?
There are no special js events for drag and drop.
You existing code for drag and drop using the mouse might work (probably with some quirks).
It all depends on how good your touchscreen monitor translates human touches to mouse events.
I'm working on making an application with adobe air and I have a div that uses overflow-y. In order for the UI to look nice and sexy, what's the best way to replace the ugly default scrollbar [link broken] with a creation of my own?
Thanks
EDIT: Everyone remember that this is on adobe air, not on a browser (I know better than to to mess with a scrollbar, that's way web -4.2)
Don't.
Users know how to to use the default platform UI widgets: they know what they look like, how they behave, etc. And the platform ones work really well.
They won't know how to use your widget. And even if you try and copy the platform one except for appearance, your widget will behave as a cheap knockoff; it will be missing features the user expects:
Does your scroll thumb grow/shrink to show the length of the document, with a minimum size such that its always grab-able — but only on platforms where that is expected?
Does middle-click scroll to the position clicked, left-click scroll down only, and right-click scroll up only, and each in proportion to where clicked on the scrollbar — on the platform where this is expected?
Does clicking in the blank space between the thumb and up or down arrow work? Does it scroll by the amount the user is expecting, which varies by platform?
Does scrolling go at the speed the user expects when the scroll buttons are held down?
How is the user dragging the thumb handled when the mouse goes outside the scrollbar? Or middle-click, on the before-mentioned platform.
Does your custom scroll bar follow the visual theme the user selected e.g., because he needs extra-high-contrast and/or extra-large widgets due to disability?
The answer to most of those is probably "no". At least, that's been my experience with web sites where the designer decided the platform scroll bars aren't cute enough.
Skin them, like you would any other flex component. To keep your code nice any clean you can specify the embed the skin files through a style in a css file.
Edit: A link on how to skin a scrollbar