How to enable scrolling content inside a Bootstrap

问题:

I'm trying to fit a lot of text into a modal box created using Twitter Bootstrap but I'm having a problem: the content refuses to scroll. I tried adding overflow:scroll and overflow-y:scroll but to no avail; that merely causes it to display a scroll-bar without actually enabling scrolling.

What's the cause behind that and what can I do?

回答1:

In Bootstrap.css change the background attribute (position) of Modal from fixed to absolute

回答2:

In Bootstrap 3 you have to change the css class .modal

before (bootstrap default) :

.modal {

    overflow-y: auto;
}

after (after you edit it):

.modal {

    overflow-y: scroll;
}

回答3:

This answer actually has two parts, a UX warning, and an actual solution.

UX Warning

If your modal contains so much that it needs to scroll, ask yourself if you should be using a modal at all. The size of the bootstrap modal by default is a pretty good constraint on how much visual information should fit. Depending on what you're making, you may instead want to opt for a new page or a wizard.

Actual Solution

Is here: http://jsfiddle.net/ajkochanowicz/YDjsE/2/

This solution will also allow you to change the height of .modal and have the .modal-body take up the remaining space with a vertical scrollbar if necessary.

UPDATE

Note that in Bootstrap 3, the modal has been refactored to better handle overflowing content. You'll be able to scroll the modal itself up and down as it flows under the viewport.

回答4:

If I recall correctly, setting overflow:hidden on the body didn't work on all the browsers I was testing for a modal library I built for a mobile site. Specifically, I had trouble with preventing the body from scrolling in addition to the modal scrolling even when I put overflow:hidden on the body.

For my current site, I ended up doing something like this. It basically just stores your current scroll position in addition to setting "overflow" to "hidden" on the page body, then restores the scroll position after the modal closes. There's a condition in there for when another bootstrap modal opens while one is already active. Otherwise, the rest of the code should be self explanatory. Note that if the overflow:hidden on the body doesn't prevent the window from scrolling for a given browser, this at least sets the original scroll location back upon exit.

function bindBootstrapModalEvents() {
    var $body = $('body'),
        curPos = 0,
        isOpened = false,
        isOpenedTwice = false;
    $body.off('shown.bs.modal hidden.bs.modal', '.modal');
    $body.on('shown.bs.modal', '.modal', function () {
        if (isOpened) {
            isOpenedTwice = true;
        } else {
            isOpened = true;
            curPos = $(window).scrollTop();
            $body.css('overflow', 'hidden');
        }
    });
    $body.on('hidden.bs.modal', '.modal', function () {
        if (!isOpenedTwice) {
            $(window).scrollTop(curPos);
            $body.css('overflow', 'visible');
            isOpened = false;
        }
        isOpenedTwice = false;
    });
}

If you don't like this, the other option would be to assign a max-height and overflow:auto to .modal-body like so:

.modal-body {
  max-height:300px;
  overflow:auto;
}

For this case, you could configure the max-height for different screen sizes and leave the overflow:auto for different screen sizes. You would have to make sure that the modal header, footer, and body don't add up to more than the screen size, though, so I would include that part in your calculations.

回答5:

Set height for modal-body and not for the whole modal to get a perfect scroll on modal overlay. I get it work like this:

.MyModal {
    height: 450px;
    overflow-y: auto;
}

Here you can set height as per your requirements.

回答6:

This is how I did it purely with CSS overriding some classes:

.modal {
  height: 60%;

  .modal-body {
    height: 80%;
    overflow-y: scroll;
  }
}

Hope it helps you.

回答7:

When using Bootstrap modal with skrollr, the modal will become not scrollable.

Problem fixed with stop the touch event from propagating.

$('#modalFooter').on('touchstart touchmove touchend', function(e) {
    e.stopPropagation();
});

more details at Add scroll event to the element inside #skrollr-body

回答8:

Actually for Bootstrap 3 you also need to override the .modal-open class on body.

    body.modal-open, 
    .modal-open 
    .navbar-fixed-top, 
    .modal-open 
    .navbar-fixed-bottom {
     margin-right: 15px; /*<-- to margin-right: 0px;*/
    }

回答9:

I'm having this issue on Mobile Safari on my iPhone6

Bootstrap adds the class .modal-open to the body when a modal is opened.

I've tried to make minimal overrides to Bootstrap 3.2.0, and came up with the following:

.modal-open {
    position: fixed;
}

.modal {
    overflow-y: auto;
}

For comparison, I've included the associated Bootstrap styles below.

Selected extract from bootstrap/less/modals.less (don't include this in your fix):

// Kill the scroll on the body
.modal-open {
  overflow: hidden;
}

// Container that the modal scrolls within
.modal {
  display: none;
  overflow: hidden;
  position: fixed;
  -webkit-overflow-scrolling: touch;
}

.modal-open .modal {
  overflow-x: hidden;
  overflow-y: auto;
}

Mobile Safari version used: User-Agent Mozilla/5.0 (iPhone; CPU iPhone OS 8_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B411 Safari/600.1.4

回答10:

I had the same issue, and found a fix as below:

$('.yourModalClassOr#ID').on('shown.bs.modal', function (e) {
    $(' yourModalClassOr#ID ').css("max-height", $(window).height());
    $(' yourModalClassOr#ID ').css("overflow-y", "scroll");          /*Important*/
    $(' yourModalClassOr#ID ').modal('handleUpdate');

});

100% working.

回答11:

I was able to overcome this by using the "vh" metric with max-height on the .modal-body element. 70vh looked about right for my uses.

.modal-body {
   overflow-y: auto;
   max-height: 70vh;
}

回答12:

.modal-body {
    max-height: 80vh;
    overflow-y: scroll;
}

it's works for me

回答13:

After using all these mentioned solution, i was still not able to scroll using mouse scroll, keyboard up/down button were working for scrolling content.

So i have added below css fixes to make it working

.modal-open {
    overflow: hidden;
}

.modal-open .modal {
    overflow-x: hidden;
    overflow-y: auto;
    **pointer-events: auto;**
}

Added pointer-events: auto; to make it mouse scrollable.

回答14:

Bootstrap will add or remove a css "modal-open" to the <body> tag when we open or close a modal. So if you open multiple modal and then close arbitrary one, the modal-open css will be removed from the body tag.

But the scroll effect depend on the attribute "overflow-y: auto;" defined in modal-open

回答15:

Solution 1: You can declare .modal{ overflow-y:auto} or .modal-open .modal{ overflow-y:auto} if you are using below 3v of bootstrap (for upper versions it is already declared).

Bootstrap adds modal-open class to body in order to remove scrollbars in case modal is shown, but does not add any class to html which also can have scrollbars, as a result the scrollbar of html sometimes can be visible too, to remove it you have to set modal show/hide events and add/remove overflow:hidden on html. Here how to do this.

$('.modal').on('hidden.bs.modal', function () {
   $('html').css('overflow','auto');
}).on('shown.bs.modal', function () {
   $('html').css('overflow','hidden');
});

---

Solution 2: As modal has functionality keys, the best way to handle this is to fix height of or even better connect the height of modal with height of the viewport like this -

.modal-body {
     overflow:auto; 
     max-height: 65vh;
}

With this method you also do not have to handle body and html scrollbars.

Note 1: Browser support for vh units.

Note 2: As it is proposed above. If you change .modal{position:fixed} to .modal{position:absolute}, but in case page has more height than modal user can scroll too much up and modal will disappear from viewport, this is not good for user experience.