JavaScript
Article

Tab control usability hover triggers in jQuery

By Sam Deering

Tab control usability hover triggers in jQuery. Tested and works in Chrome, FF, IE9, IE8.

Load is jsfiddle for TAB demo to work.
jsfiddle

The tabindex Property

  • The tabindex attribute is supported in all major browsers, except Safari.
  • HTML5 – tabindex attribute can be used on any HTML element
  • jQuery

    $(document).ready(function () {
    
        /* "trigger" hover by adding a CSS class */
        $('.transition-container').on('mouseover', function (e) {
            $(this).find('.transition').addClass('activeHover');
            $(this).on('mouseout', function (e) {
                $(this).find('.transition').removeClass('activeHover');
            });
        });
    
        /* get key code */
        function getKeyCode(key) {
            //return the key code
            return (key == null) ? event.keyCode : key.keyCode;
        }
    
        /* for usabiity capture keyboard tabbing */
        $(document).on('keyup', function (eventObj) {
            //tab keycode = 9
            if (getKeyCode(eventObj) == '9') {
                var $el = $(document.activeElement);
                //remove any current active elements
                $('.transition').removeClass('activeHover');
                if ($el.hasClass('transition-container')) {
                    $el.find('.transition').addClass('activeHover');
                }
            }
        });
    
    });
    
    /* Internet Explorer sniffer code to add class to body tag for IE version */
    var ie = (function () {
    
        var undef,
        v = 3,
            div = document.createElement('div'),
            all = div.getElementsByTagName('i');
    
        while (
        div.innerHTML = '',
        all[0]);
    
        if (v > 4) {
            $('body').addClass('ie' + v);
        }
    
    }());

    CSS

    /* transition speed */
     .transition {
        -webkit-transition: -webkit-transform .2s ease-out;
        -moz-transition: -moz-transform .2s ease-out;
        -o-transition: -o-transform .2s ease-out;
        -ms-transition: -ms-transform .2s ease-out;
        transition: transform .2s ease-out;
    }
    /* IE 9 scale */
     .ie9 .activeHover {
        -ms-transform: scale(1.2, 1.2);
    }
    /* IE 8 scale */
     .ie8 .activeHover {
        filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.1, M12=0, M21=0, M22=1.1, SizingMethod='auto expand');
    }
    /* modern browsers transition */
     .activeHover {
        -webkit-transform:scale(1.2);
        -moz-transform:scale(1.2);
        -o-transform:scale(1.2);
        transform:scale(1.2);
    }
    /* IE 7 scale */
     .ie7 .activeHover {
        filter: none;
        transform: none;
    }
    .transition-container {
        border: 1px solid blue;
        margin: 15px;
        padding:5px;
    }
    *:active {
        border: 1px solid red;
    }
    }

    HTML5

    
    

    Click to get focus and start pressing TAB to switch between items. Press SHIFT+TAB to go back up.

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