I have a div which is set to overflow:scroll;. I get scrollbars which is what I want. However when scrolling the div with the mousewheel it scrolls the rest of the page when it reaches the top or bottom of the div's content.
How can I scroll only the div or the entire page based on what's hovered ?
First I don't think you can override the scroll event. So here is what I would do. I don't know jquery but here is some straight javascript.
document.getElementById('scrollDiv').onmouseover=function(){
document.getElementByTagName('body')[0].style.overflow='hidden';
}
document.getElementById('scrollDiv').onmouseout=function(){
document.getElementByTagName('body')[0].style.overflow='';
}
Obviously you could tweak this a little, but this is the basic idea. Also, if you need to you could do other test cases. Like if the div has focus then do the same thing. Depends on your setup.
You could test the mouse position and cancel the scroll events for the document if the mouse is within the bounds of the div.
In this case, I think you'll have to override the default onscroll event for the body. In your handler, you'll need to manually scroll the div's contents.
Related
I need to respond to a user manually scrolling an element that has a scrollbar.
Unfortunately, the scroll event occurs on the same element in several different circumstances:
when the user scrolls the element (the only one I’m interested in);
when the user resizes the window and the element’s scroll position changes indirectly;
when the user changes the zoom of the page and the element’s scroll position changes indirectly;
when the code changes the element’s scrollTop position programmatically.
Is there any way to isolate only the first case and have a handler trigger only when the user actually literally scrolls the element?
I don't know if it is what you are looking for but, as said in this page, you can check the event.target to verify if your scroll is on the wanted element.
You can prevent the bubbling of the scroll event by preventDefault() as much as I can remember.So if you register the scroll event(j-query) on the control and prevent it's bubbling up to the other controls I think is gonna solve what you are looking for.
On a webpage can I hijack the vertical scrolling action and make it horizontal?
Please try and ignore the potential usability issues.
On a webpage can I hijack the vertical scrolling action and make it horizontal?
Not as far as I know (except maybe by rotating the element - but that is probably not what you want).
You would have to re-arrange the contents to make the vertical scroll bar go away, and force a horizontal one instead.
Whether that is possible will strongly depend on the nature of the HTML elements inside the page.
Here's a jQuery Plugin that does this, and you can specify it to only work when the mouse is over the target element:
http://flowplayer.org/tools/scrollable/index.html
Yes you can do this.
Vertical scrolling is set to element.scrollTop
You could simply add a loop that catches scrollTop when it changes, sets it back to zero and then sets the scrollLeft to be = to the changed position.
More so, an even better solution is to overwrite the onscroll event.
window.onscroll = function(event){
event.preventDefault() // Stops the page from scrolling vertically.
window.scrollLeft = event.scrollTop // This is not the correct event attribute, youll have to locate it yourself.
}
You could hook into the scroll event, check which plane is being scrolled, if it was the vertical then set the difference as the horizontal scroll and set the vertical scroll to it's previous value. Though I can imagine that would be incredibly expensive.
http://jsfiddle.net/nicktheandroid/7raYa/9/
My script allows me to scroll the page like a PDF, allowing you to grab the page and drag down or up. My problem, is that when i use the scrollbar, then mouseup from the scroll bar, the scrollbar will stick and scroll with my mouse up and down, even though my mouse is up. So when clicking on the scrollbar, its like i never moused up. how do I fix this?
THANKS!
I believe the scrollbar is part of the page, so when you click it, it makes your script believe the mouse is down - you'll notice that after you mouseup from clicking on the scrollbar that the page continues to move up and down until you click. Try to grab the coordinates of the mouse on mouse down, and make sure that the click occurred inside of the page (minus the scrollbar)
Edit: I was correct - here is the updated jsFiddle with it working: http://jsfiddle.net/xDtVL/
I have a simple Javascript drag function. You can see it here:
http://jsfiddle.net/XpAyA/12/
The red #dragger div is draggable. It is nested in an overflow scroll div but it doesn't trigger a "scroll" when it gets over the limit. Probably due to the fact that it is positioned absolute.
Is there a way yo fix this? Make the scroll happen when it exceeds the limits?
Thank you
First of all you have to give the containing div a position:relative. That way the absolutely positioned dragger stays inside of it and can't go over it's borders.
I'm not sure why the scrolling doesn't work, but is there a reason you scripted your dragging function yourself while you do have access to jQuery? There's a powerful function in jQuery called draggable that does exactly what you want.
Here's a version that scrolls http://jsfiddle.net/vcJuF/1/
I removed the inner div, which seemed to help. The scrollbars update now, I think you just need to update your javascript to actually scroll the div as you drag.
this question is for an autocomplete drop down list I have to do that will fire while you're writing in an html textbox.
It basically consists of a div containing the suggestion elements, each of them being a div as well.
I got to the point where it's begining to work properly but now I added a vertical scroll to the containing div so you can limit the height of the drop down list, and I got the following behaviour:
If you use the scroll, it scrolls up or down in "pixels", so it cuts my elements making it all look anything but sleek.
I'd like to override the behaviour to go up and down one whole div element when you use the scroll. I don't even know how to google for this...
Anybody knows any useful resource about this or can give any tip as to where to start, if it's possible to override the scroll movement events or I should look into another direction?
Thanks a lot in advance
Note: I cannot use jquery autocomplete plugin.
You could implement your own scrollbar, using mouse events and updating positions manually.
Could you not tap into a 'scroll' event for that element (DOM 3 Events provides a scroll event for an element, not sure how supported it is), such that whenever the scroll position is changed, it calls a little routine of your own that adjusts the scroll position by rounding it to the nearest 'notch'?
Or, you could regularly poll for the scroll position and adjust it when it has moved. This scroll position seems fairly cross-browser.
First:
Using your own scroll bar, make a scroll event handler. Here you could use an animation by delta ( it is found in evt ) on which you can set the scrollTop of the element yourself by the offsetHeight of your top or bottom visible element. Also if the div height does cut off an element just make the previous or next element a bit "higher" aka set it's height to push the cut off element up or down.
Second:
You could "patch" the div so only a few elements would be visible. and while you scroll you hide the top one and display the bottom one in a animation, without using scrollTop or scrollHeight.
Watch out for scroll event in Firefox. It has another name, but you can test it like this:
eventName = eventName === 'mousewheel' ? ((/Firefox/i.test(navigator.userAgent)) ? "DOMMouseScroll" : eventName) : eventName;
Good Luck. If you need any help in about 2 days i will have it implemented, because i need one too.
This simply cannot be done, there is no solution, period. One must live with this limitation.
Why is there no solution?
Because even if you implement your own scroll bar, you would still have to rely on scroll events, and these can be neither canceled nor prevented from bubbling to the body element. Really, they can't, you can call preventDefault() and stopPropagation() on them till the cows come home and they still bubble. This is a deliberate decision on the part of the standardizing body and browser implementors.
If scroll events were cancellable, EхpеrtEхchangе could prevent you from scrolling to the bottom of the page to see the answer ;) (don't worry, I used some Cyrillic letters in "EхpеrtEхchangе" so they don't get an indexable mention).