Table Border - Highlight Selected Item

by Arun P Johny

HTML

<div style="padding: 10px">
<table>
    <tr>
        <td>1.1</td>
        <td>1.2</td>
        <td>1.3</td>
        <td>1.4</td>
        <td>1.5</td>
    </tr>
    <tr>
        <td>2.1</td>
        <td>2.2</td>
        <td>2.3</td>
        <td>2.4</td>
        <td>2.5</td>
    </tr>
    <tr>
        <td>3.1</td>
        <td>3.2</td>
        <td>3.3</td>
        <td>3.4</td>
        <td>3.5</td>
    </tr>
    <tr>
        <td>4.1</td>
        <td>4.2</td>
        <td>4.3</td>
        <td>4.4</td>
        <td>4.5</td>
    </tr>
    <tr>
        <td>5.1</td>
        <td>5.2</td>
        <td>5.3</td>
        <td>5.4</td>
        <td>5.5</td>
    </tr>
</table>
</div>

CSS

table {
    table-layout: fixed;
    border-spacing: 0;
    border-collapse: collapse;
}

td {
    border: 1px solid lightgrey;
    height: 60px;
    width: 60px;
    text-align: center;
    vertical-align: middle;
}

td.active {
    border: 1px solid blue;
}

td.brdr-b-hide {
    border-bottom: none;
}
td.brdr-r-hide {
    border-right: none;
}

JavaScript

var fnActivate = function(target) {
    target.addClass('active');

    if(!target.is(':first-child')) {
        target.prev().addClass('brdr-r-hide')
    }
            
    var tr = target.closest('tr');
    if(!tr.is(':first-child')) {
        var prevTr = tr.prev();
        $('td', prevTr).eq($('td', tr).index(target)).addClass('brdr-b-hide');
        
    }
};

var fnDeactivate = function(target) {
    target.removeClass('active');

    if(!target.is(':first-child')) {
        target.prev().removeClass('brdr-r-hide')
    }
            
    var tr = target.closest('tr');
    if(!tr.is(':first-child')) {
        var prevTr = tr.prev();
        $('td', prevTr).eq($('td', tr).index(target)).removeClass('brdr-b-hide');
        
    }
}

$('table').on('click', 'td', function(e){
        var target = $(e.currentTarget);

        if(e.ctrlKey && target.hasClass('active')){
            fnDeactivate(target);
        } else if(e.ctrlKey) {
            fnActivate(target);
        } else {
            fnDeactivate($('table td.active'));
            fnActivate(target);
        }
    
    });