Focus on list item on down arrow press

Question

I am creating a custom auto suggest-box I need to move on li items on arrow down press.

so I added tabindex attribute to li it is getting focus. but problem is that it scrolling the div up with some random height that it out the selected li from div.

after arrow down key:

and after some arrow-down key press:

and after that it goes out of screen while mouse down behave perfectly.

Here I made a Demo JSFiddle first click item1 and then press arrow down it behaving same.

Answer 1

Elaborating on my comment

Set the container's scrollTop to index of focused li * li height .

return false upon keydown to prevent normal browser scrolling of overflown parent.

$('div.container').on('focus', 'li', function() {
    var $this = $(this);
    $this.addClass('active').siblings().removeClass();
    $this.closest('div.container').scrollTop($this.index() * $this.outerHeight());
}).on('keydown', 'li', function(e) {
    var $this = $(this);
    if (e.keyCode === 40) {        
        $this.next().focus();
        return false;
    } else if (e.keyCode === 38) {        
        $this.prev().focus();
        return false;
    }
}).find('li').first().focus();

jsfiddle http://jsfiddle.net/38zR3/42/

Answer 2

Have you tried using anchor instead of tabindex? eg

<li><a href="#"></li>

In my experience some browsers cannot handle the focus on tabindex correctly

Answer 3

我有一个这样的问题，并通过将包含div的CSS样式overflow设置为none或hidden来解决它，具体取决于您的偏好。

Answer 4

添加.scrollTop()以确保它居中或按您希望的方式放置。