How to Get Nth-Child Selector to Skip Hidden Divs

How to get nth-child selector to skip hidden divs

When the user clicks on a button, I hide few blocks by display:none,
and the problem occurs. The nth-child selector also counts hidden
elements.

Is there way to ignore those specific blocks, so that again every row
has different style?

The problem is that the nth-child() selector looks at all siblings under the same parent regardless of styling. It doesn't matter that you've applied display: none because CSS doesn't remove the element from the DOM, and therefore it's still a sibling.

From the spec:

6.6.5.2. :nth-child()
pseudo-class

The :nth-child(an+b) pseudo-class notation represents an
element that has an+b-1 siblings before it in the document
tree, for any positive integer or zero value of n, and has a parent
element. (emphasis mine)

In order for the nth-child rules you've declared to work after a user clicks to hide divs, you need to remove the hidden divs from the DOM, so they no longer exist as siblings.

In your question you request a CSS-only solution. But in your comments you say that the HTML is open for changes. You also use a bit of jQuery to hide elements.

With one small line of code added to your jQuery the problem can be solved:

$('.hidden').remove();

The .remove() method takes elements (and its descendants) out of the DOM. In this case it removes all elements with a class hidden.

CORRECTION

The problem with remove() is that elements taken from the DOM with this method can't be restored, and this breaks the toggle function.

Fortunately, jQuery offers an alternative: detach().

The .detach() method is the same as .remove(), except that
.detach() keeps all jQuery data associated with the removed
elements. This method is useful when removed elements are to be
reinserted into the DOM at a later time.

So if we replace the original code...

$('.hide-others').click(function () {
    $('.css--all-photo').toggleClass('hidden');
})

...with this code...

var divs;

$('.photos-board-item').each(function(i){
    $(this).data('initial-index', i);
});

$('.hide-others').on('click', function () {
    if(divs) {
        $(divs).appendTo('.row').each(function(){
            var oldIndex = $(this).data('initial-index');
            $('.photos-board-item').eq(oldIndex).before(this);
        });
        divs = null;
    } else {
        divs = $('.css--all-photo').detach();
    }
});

... the grid works as intended. (code credit: @JosephMarikle)

DEMO

Now, regardless of which divs or how many are hidden, they can be toggled on and off without disrupting the visual design because the nth-child selector is counting only "visible" siblings. No changes to the CSS. No changes to the HTML.

Select odd even child excluding the hidden child

Pseudo-selectors don't stack, so your :not doesn't affect the :nth-child (nor would it affect :nth-of-type etc.

If you can resort to jQuery, you can use the :visible pseudo-selector there, although that's not a part of the CSS spec.

If you're generating the HTML and can change that, you can apply odd/even with logic at run-time, eg in PHP:

foreach ($divs AS $i => $div) {
    echo '<div class="box ' . ($i % 2 ? 'even' : 'odd') . '">x</div>';
}

Even trying to do something tricky like

.box[class='box']:nth-of-type(even)

doesn't work, because the psuedo-selector doesn't even stack onto the attribute selector.

I'm not sure there's any way to do this purely with CSS - I can't think of any right now.

Filter :nth-child ignoring where css display is none

Okay managed to get it working by returning the css property before calling the :nth-child

function makeheight(){
var $sections = $('.section-link');

    $sections.filter(function() {
   return $(this).css('display') == 'block';
}, ':nth-child(3n-2)').each(function () {

        var $this = $(this),
            $els = $this.nextAll(':lt(2)').addBack();
        var sectionheight = new Array();
        $els.each(function () {
            var value = $(this).find('.section-title').height();
            sectionheight.push(value);
        });
        var newsectionheight = Math.max.apply(Math, sectionheight);
        $els.find('.section-title').height(newsectionheight);
    });


}

CSS nth-chid selector without hidden chilld node

You can do something like this:

Since you have hide element as well so this is the place where you have to use ~(negate) for odd and even
The code is pretty straight forward to understand let me know if you need explaination.

.whois {  background: green;  color: white;}
.whois:nth-child(even) {  background: black;  color: white;}
.whois.hide {  display: none;}
.whois.hide~.whois:nth-child(odd) {  background: black;  color: white;}
.whois.hide~.whois:nth-child(even) {  background: green;  color: white;}

<table>  <tr class="whois">    <td>row 1</td>  </tr>  <tr class="whois">    <td>row 2</td>  </tr>  <tr class="whois hide">    <td>row 3</td>  </tr>  <tr class="whois">    <td>row 4</td>  </tr>  <tr class="whois">    <td>row 5</td>  </tr></table>

$('.card:visible:even').css({ 'background': 'pink'});
$('.card:visible:odd').css({ 'background': 'white'});

$(document).on("keyup", ".my_input", function() {  var input_val = $(this).val();  var input_length = input_val.length;  // minimum 2 chars for search  if (input_length > 2) {    filter_cards(input_val);  } else if (input_length <= 2) {    $(".card").show();    // remove matched text styling    // see: https://stackoverflow.com/a/4232971    $('span.matched_text').contents().unwrap();  }  $('.card:visible:even').css({ 'background': 'pink','marginRight':'20px'});  $('.card:visible:odd').css({ 'background': 'white','marginRight':0});});
// filter functionfunction filter_cards(input_val) {
  // iterate over each card  $(".card").each(function() {
    var match_counter = 0;
    // instance of card    var $card = $(this);
    var text = $card.text();
    var exists_in_string =      text.toLowerCase().indexOf(input_val.toLowerCase()) !== -1;
    if (exists_in_string === false) {      $card.html(text);    } else if (exists_in_string === true) {      match_counter += 1;      var reg = new RegExp(input_val, 'i');      $card.html(text.replace(reg, '<span class="matched_text">$&</span>'));    }
    if (match_counter > 0) {      $card.show();    } else {      $card.hide();    }   });}

* {  box-sizing: border-box;}
.my_input {  width: 100%;  font-size: 48px;  margin-bottom: 20px;}
.my_cards {  display: flex;  flex-wrap: wrap;}
.card {  width: calc(50% - 10px);  font-size: 38px;  border: 1px solid #000;  margin-bottom: 30px;  overflow:hidden;}

/* add margin on child divs 1,3,5,7 etc */
.card:nth-child(2n+1) {  margin-right: 20px;  background: pink;}
.matched_text {  background: green;  color: white;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><input class="my_input" placeholder="search for hello, min 2 chars...">
<div class="my_cards">
  <div class="card" data-initial_index="0">    01 - apples and hello  </div>
  <div class="card" data-initial_index="1">    02 - oranges and hello  </div>
  <div class="card" data-initial_index="2">    03 - bananas  </div>
  <div class="card" data-initial_index="3">    04 - passionfruits and hello  </div>
  <div class="card" data-initial_index="4">    05 - mangos and hello  </div>
  <div class="card" data-initial_index="5">    06 - limes and hello  </div>

</div>