Fix Bootstrap Padding On Nested Columns

Question

Bootstrap 3 applies a 15px left and right padding on columns.

This is causing me trouble because my layout has a lot of nested columns:

<div class="col-md-6"></div>
<div class="col-md-6"></div>
<div class="col-md-12">
    <div class="col-md-6">
        <div class="col-md-12"></div>
        <div class="col-md-12"></div>
    </div>
    <div class="col-md-6"></div>
</div>

See Fiddle.

I don't need to just remove the padding because I need the separation between the elements.

The result I'm after, visually, is this: http://jsfiddle.net/Aeup8/8/

My first approach was to set:

[class^='col-'] {
    padding:0;
}
[class^='col-'] + [class^='col-'] {
    padding-left: 15px;
}

However, this will not fix columns that wrap onto a second row.

See Fiddle

My second approach was using JavaScript:

(function($) {
    var $els = $('[class^="col-"');
    //console.log($els);
    var cols = {};
    $els.each(function(i, col) {
        var classes = $(col).attr('class').split(' ');

        classes.forEach(function(str) {
            var match = str.match(/col-(\w+)-(\d+)/);
            if ( match ) {
                //console.log($els.eq(i));
                cols[match[1]] = cols[match[1]] || {};
                var current = cols[match[1]];

                if ( match[2] == 12 ) {
                    current.ids = [];
                    current.sum = 0;

                    $els.eq(i).css({ padding: 0 });
                    return
                }

                current.ids = current.ids || [];
                current.sum = current.sum || 0;
                current.sum += ( +match[2] );
                current.ids.push(i);
                if (current.sum == 12) {
                    //console.log(current);
                    current.ids.forEach(function(id) {
                        $els.eq(id).css({ 'padding': 0, 'padding-right': '15px' });
                        if (id == i) $els.eq(id).css({ 'padding': 0, 'padding-left': '15px' });
                    });
                    current.ids = [];
                    current.sum = 0;
                }
            }
        });
    });
})(jQuery);

See Fiddle

But it has problems:

• It does not traverse the DOM in the desired order, so it won't do nested ones well.
• I don't even want to fix that because it seems like this is a very bad solution (it would happen every time the viewport size changes)

What do I do?

Answer 1

You can counter the duplicated padding when nesting columns by wrapping each layer in its own .row:

<div class="row">
    <div class="col-md-6"></div>
    <div class="col-md-6"></div>
    <div class="col-md-12">
        <div class="row">
            <div class="col-md-6">
                <div class="row">
                    <div class="col-md-12"></div>
                    <div class="col-md-12"></div>
                </div>
            </div>
            <div class="col-md-6"></div>
        </div>
    </div>
</div>

The gap between the 2 primary columns will remain, but the nesting won't continue to indent further: http://jsfiddle.net/5uqmE/.

They currently accomplish this by apply a negative margin that opposes the outer padding:

// Row
//
// Rows contain and clear the floats of your columns.

.row {
  .make-row();
}

// Creates a wrapper for a series of columns
.make-row(@gutter: @grid-gutter-width) {
  margin-left:  (@gutter / -2);
  margin-right: (@gutter / -2);
  &:extend(.clearfix all);
}