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Apply class to parent if child div contains class

ChristinaHooper

# September 15, 2012 at 12:17 pm

I spent years working as a .NET developer, and working with other programmers that used crazy abbreviations and all lower case for their variables, and it just made it really really hard to follow the progression of their code. So I started Camel Case then and just kept going with it since to me, it made it more readable.

@theacefes – Kudos on your first CodePen

@hompimpa – I finally got it working with your example and a combination of getting that code coming after the jquery call.

@Everyone – Thank-you so much for all your help!

TheDoc

# September 15, 2012 at 12:26 pm

@hompimpa – that code doesn’t look quite right to me. The body is going to end up with basically all of the classes that are present on the page.

`$(this).hasClass(foo)` is always going to return true.

@ChristinaHooper – if you’re looking at a specific div only, this should be what you’re after:

$(document).ready(function() {
if( $(‘#target’).hasClass(‘blue’) ) {
$(document.body).addClass(‘yellow’);
}
});

Taufik Nurrohman

# September 15, 2012 at 8:07 pm

@TheDoc: That’s just an example. I guess @ChristinaHooper can understand what I mean :p

ChristinaHooper

# September 15, 2012 at 8:12 pm

I think @hompimpa ‘s example worked for me since I only have one div that has the class I’m searching for.

@TheDoc Your example would be more reliable in most cases though I would think
Taufik Nurrohman

# September 15, 2012 at 9:08 pm

This is better:
```
$(document).ready(function() {

if ($('#target').length) {

var color = $('#target').attr('class');

$('body').addClass(color); // or: $('#target').parent().addClass(color);

}

});
```
```
<body>

...

<div id="target" class="red"></div>

...

<body>
```
TheDoc

# September 15, 2012 at 10:57 pm

I don’t think that’s better at all.

For starters, you don’t need to check `#target` length, that’s an extra step that isn’t necessary. Checking `hasClass()` will return true or false and will execute only if true. Since we’re only checking for something specific, this is significantly more effective.

Second, setting a variable isn’t what we’re looking for, since you’ll be collecting *all* classes assigned to the `#target` div. What if you are looking for a classing of `red` but want to add a class of `blue` to the body?

Third, `$(document.body)` should be used over `$(‘body’)` based on speed alone.

You’re adding things that aren’t particularly necessary to this issue, my friend!

Taufik Nurrohman

# September 15, 2012 at 11:12 pm

@TheDoc: Yes. You’re right: http://jsfiddle.net/tovic/yJ6Mg/18/

eking

# January 16, 2013 at 2:42 pm

Hi, I’m new here but I saw TheDoc’s solution so I figured I should signup. I’m trying to add some colors to some CMS rendered code, and need a way to change a parent’s style, when an ID is present in the child. The problem is that new class is entered on all of the matching classes not just the one with the child.

if($(‘.lof-inner div’).hasClass(‘hot’)) {
$(“.lof-title”).addClass(“blinkurgent”);

}

eking

# January 16, 2013 at 2:45 pm

Title
Thursday, 10 January 2013 14:55

Some text

Text

Text

Some Text

Title
Thursday, 10 January 2013 14:55

Some text

Text

Text

Some Text

markkes

# January 16, 2013 at 4:48 pm

eking try this: http://jsfiddle.net/SpVLK/3/

As u see both will work:

$(‘.lof-inner .hot’).closest(‘.lof-inner’).find(‘.lof-title’).addClass(‘blinkurgent’);
$(‘.lof-inner .hot’).siblings(‘.lof-title’).addClass(‘bold’);

eking

# January 17, 2013 at 9:14 am

Awesome! Thanks so much!

eking

# January 17, 2013 at 2:56 pm

Okay, I apologize for my confusion I’ve added this to my document like this but It’s not working any suggestions?

$(document).ready(function(){
$(“body”).focus(function(){
$(‘.lof-inner div.hot’).closest(‘.lof-inner’).find(‘.lof-title’).addClass(‘blinkurgent’);
$(‘.lof-inner div.hot’).siblings(‘.lof-title’).addClass(‘bold’);
});
});

eking

# January 21, 2013 at 5:01 pm

Okay I got it to work in the CMS! (I had to change some settings) I’m trying to use this same method to change a background color, but it doesn’t seem to work. At first I just thought that it was the CMS but I also can’t get it to work in JS fiddle.

http://jsfiddle.net/eak819/jmFe7/

Is something incorrect?

$(‘.lof-inner div.hot’).siblings(‘.lof-row’).addClass(‘blackred’);

When sibling .lof-row is found it will add .blackred then CSS takes over from there. I’ve also tried to use the .closest selector but no joy.

eking

# January 24, 2013 at 3:23 pm

I fixed it, thanks guys!

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