Wrapping Multiple Columns with Equal Spacing

by Michael Mandarino

HTML

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<h1>Wrapping Multiple Columns with Equal Spacing - v1.0</h1>
<h2>Last Update: August 14th 2017 by Michael Mandarino</h2>

<div class="row">
    <div class="col">
        Col 1
    </div>
    <div class="col">
        Col 2
    </div>
    <div class="col">
        Col 3
    </div>
    <div class="col">
        Col 4
    </div>
    <div class="col">
        Col 5
    </div>
    <div class="col">
        Col 6
    </div>
    <div class="col">
        Col 7
    </div>
    <div class="col">
        Col 8
    </div>
    <div class="col">
        Col 9
    </div>
    <div class="col">
        Col 10
    </div>
</div>

SCSS

/* Base Styles */

*,
*:after,
*:before {
    box-sizing: border-box;
}

body {
    font-family: Helvetica, Arial, Sans-Serif;
    font-size: 16px;
	margin: 0 auto;
	max-width: 1000px;
    padding: 0.5em;
}

h1 {
    color: #61bb46;
    font-size: 2em;
}

h2 {
    font-size: 0.75em;
    margin-bottom: 1em;
}


/* Main Styles */

.row {
	display: -ms-flexbox;
	display: -webkit-flex;
	display: flex;
	-ms-flex-flow: row wrap;
	-webkit-flex-flow: row wrap;
	flex-flow: row wrap;
	margin: 0 -1rem;
	
    > .col {
    	-ms-flex: 1 0 calc(33.33% - 2rem);
		-webkit-flex: 1 0 calc(33.33% - 2rem);
        flex: 1 0 calc(33.33% - 2rem);
        background-color: #61bb46;
        border: 8px solid #00afba;
        color: #fff;
		margin: 1rem;
		min-width: 300px;
        padding: 1rem;
        text-align: center;
		
        &:before {
            content: '';
            display: inline-block;
            vertical-align: middle;
            padding-top: 100%;
        }
		
		/*Use Script to create hidden boxes, so that the last box does not stretch full width*/
		&.hidden {
			background-color: transparent;
			border: dashed 1px red;
			/*height: 0;*/
			padding: 0;
		}
    }
}

JavaScript

$('.row').each(function() {
     var count = $(this).find('.col').length;
     var remainder = Math.abs((count % 3) - 3);

     for (var i = 0; i < remainder; i++) {
         $('<div class="col hidden"></div>').appendTo(this);
     }
 });