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Count number of li element and addclass

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I am trying to count LI elements, and addclass to another div.

For example,

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

This should be like this

<div class="box2 list3">text</div>

But I don't know why when I check on the DOM code,

<div class="box2 list0">text</div>

I get this result.

What do I need to fix the code?
Please help.

asked 1 hour ago

kk kk

926

1

Your $(this) is not pointing to .box2 as you expect

– Mr. Alien
1 hour ago

@Mr.Alien It is what it actually does, pointing to .box2, hence not working as expected as there is no .box1 after it.

– LGSon
49 mins ago

@Mr.Alien A console.log($(this) shows that $(this) is pointing to .box2. If you reverse the HTML structure of box1 and box2 and change the JavaScript to return 'list' + $(this).find('+ .box1 li').length;, you'll see it's working properly using the adjacent sibling selector added to the start of find.

– Andy Hoffman
43 mins ago

It would be great to add $(document).ready(function(){, around your JQuery operations,

– harish sharma
10 mins ago

add a comment |

I am trying to count LI elements, and addclass to another div.

For example,

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

This should be like this

<div class="box2 list3">text</div>

But I don't know why when I check on the DOM code,

<div class="box2 list0">text</div>

I get this result.

What do I need to fix the code?
Please help.

asked 1 hour ago

kk kk

926

1

Your $(this) is not pointing to .box2 as you expect

– Mr. Alien
1 hour ago

@Mr.Alien It is what it actually does, pointing to .box2, hence not working as expected as there is no .box1 after it.

– LGSon
49 mins ago

@Mr.Alien A console.log($(this) shows that $(this) is pointing to .box2. If you reverse the HTML structure of box1 and box2 and change the JavaScript to return 'list' + $(this).find('+ .box1 li').length;, you'll see it's working properly using the adjacent sibling selector added to the start of find.

– Andy Hoffman
43 mins ago

It would be great to add $(document).ready(function(){, around your JQuery operations,

– harish sharma
10 mins ago

add a comment |

I am trying to count LI elements, and addclass to another div.

For example,

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

This should be like this

<div class="box2 list3">text</div>

But I don't know why when I check on the DOM code,

<div class="box2 list0">text</div>

I get this result.

What do I need to fix the code?
Please help.

asked 1 hour ago

kk kk

926

I am trying to count LI elements, and addclass to another div.

For example,

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

This should be like this

<div class="box2 list3">text</div>

But I don't know why when I check on the DOM code,

<div class="box2 list0">text</div>

I get this result.

What do I need to fix the code?
Please help.

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

$('.box2').addClass(function(){

  return 'list' + $(this).find('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

javascript html css

asked 1 hour ago

kk kk

926

asked 1 hour ago

kk kk

926

asked 1 hour ago

kk kk

926

asked 1 hour ago

kk kk

926

asked 1 hour ago

kk kk

926

1

Your $(this) is not pointing to .box2 as you expect

– Mr. Alien
1 hour ago

@Mr.Alien It is what it actually does, pointing to .box2, hence not working as expected as there is no .box1 after it.

– LGSon
49 mins ago

@Mr.Alien A console.log($(this) shows that $(this) is pointing to .box2. If you reverse the HTML structure of box1 and box2 and change the JavaScript to return 'list' + $(this).find('+ .box1 li').length;, you'll see it's working properly using the adjacent sibling selector added to the start of find.

– Andy Hoffman
43 mins ago

It would be great to add $(document).ready(function(){, around your JQuery operations,

– harish sharma
10 mins ago

add a comment |

1

Your $(this) is not pointing to .box2 as you expect

– Mr. Alien
1 hour ago

@Mr.Alien It is what it actually does, pointing to .box2, hence not working as expected as there is no .box1 after it.

– LGSon
49 mins ago

@Mr.Alien A console.log($(this) shows that $(this) is pointing to .box2. If you reverse the HTML structure of box1 and box2 and change the JavaScript to return 'list' + $(this).find('+ .box1 li').length;, you'll see it's working properly using the adjacent sibling selector added to the start of find.

– Andy Hoffman
43 mins ago

It would be great to add $(document).ready(function(){, around your JQuery operations,

– harish sharma
10 mins ago

Your $(this) is not pointing to .box2 as you expect

– Mr. Alien
1 hour ago

@Mr.Alien It is what it actually does, pointing to .box2, hence not working as expected as there is no .box1 after it.

– LGSon
49 mins ago

@Mr.Alien A console.log($(this) shows that $(this) is pointing to .box2. If you reverse the HTML structure of box1 and box2 and change the JavaScript to return 'list' + $(this).find('+ .box1 li').length;, you'll see it's working properly using the adjacent sibling selector added to the start of find.

– Andy Hoffman
43 mins ago

It would be great to add $(document).ready(function(){, around your JQuery operations,

– harish sharma
10 mins ago

add a comment |

5 Answers
5

active

oldest

votes

Pretty close. box1 comes before box2, so your query beginning at box2, or $(this), would return 0 results as find looks ahead in the DOM.

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

thank you for your answer :)

– kk kk
1 hour ago

add a comment |

Here $(this) is referring to box2 element.Only $('.box1 li').length is what you required

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

thank you this works perfectly

– kk kk
1 hour ago

add a comment |

this is not pointing to the element you are thinking, it is referring to DIV element on which the addClass() is invoked and this element does not have .box1 li. Thus find() is failing to refer your intended element.

Simply use:

$('.box1 li').length

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

add a comment |

$(this).find will find the li in the div with box2 class which are not present. Instead check this in the div with box1 class and find the li elements

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

add a comment |

You can simply do this by following method

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

answered 1 hour ago

Sarabjit Singh

1169

add a comment |

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5 Answers
5

active

oldest

votes

5 Answers
5

active

oldest

votes

Pretty close. box1 comes before box2, so your query beginning at box2, or $(this), would return 0 results as find looks ahead in the DOM.

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

thank you for your answer :)

– kk kk
1 hour ago

add a comment |

Pretty close. box1 comes before box2, so your query beginning at box2, or $(this), would return 0 results as find looks ahead in the DOM.

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

thank you for your answer :)

– kk kk
1 hour ago

add a comment |

Pretty close. box1 comes before box2, so your query beginning at box2, or $(this), would return 0 results as find looks ahead in the DOM.

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

Pretty close. box1 comes before box2, so your query beginning at box2, or $(this), would return 0 results as find looks ahead in the DOM.

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

$('.box2').addClass(function(){

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>



<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

edited 1 hour ago

answered 1 hour ago

Andy Hoffman

8,07631538

answered 1 hour ago

Andy Hoffman

8,07631538

answered 1 hour ago

Andy Hoffman

8,07631538

thank you for your answer :)

– kk kk
1 hour ago

add a comment |

thank you for your answer :)

– kk kk
1 hour ago

thank you for your answer :)

– kk kk
1 hour ago

add a comment |

Here $(this) is referring to box2 element.Only $('.box1 li').length is what you required

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

thank you this works perfectly

– kk kk
1 hour ago

add a comment |

Here $(this) is referring to box2 element.Only $('.box1 li').length is what you required

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

thank you this works perfectly

– kk kk
1 hour ago

add a comment |

Here $(this) is referring to box2 element.Only $('.box1 li').length is what you required

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

Here $(this) is referring to box2 element.Only $('.box1 li').length is what you required

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass(function() {

  return 'list_' + $('.box1 li').length;

});

.list_3 {

  color: green;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

edited 1 hour ago

answered 1 hour ago

brk

28.4k32143

answered 1 hour ago

brk

28.4k32143

answered 1 hour ago

brk

28.4k32143

thank you this works perfectly

– kk kk
1 hour ago

add a comment |

thank you this works perfectly

– kk kk
1 hour ago

thank you this works perfectly

– kk kk
1 hour ago

add a comment |

Simply use:

$('.box1 li').length

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

add a comment |

Simply use:

$('.box1 li').length

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

add a comment |

Simply use:

$('.box1 li').length

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

Simply use:

$('.box1 li').length

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass(function(){

  console.log(this.nodeName); // DIV

  return 'list' + $('.box1 li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

edited 54 mins ago

answered 1 hour ago

Mamun

29k71831

answered 1 hour ago

Mamun

29k71831

answered 1 hour ago

Mamun

29k71831

add a comment |

$(this).find will find the li in the div with box2 class which are not present. Instead check this in the div with box1 class and find the li elements

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

add a comment |

$(this).find will find the li in the div with box2 class which are not present. Instead check this in the div with box1 class and find the li elements

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

add a comment |

$(this).find will find the li in the div with box2 class which are not present. Instead check this in the div with box1 class and find the li elements

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

$(this).find will find the li in the div with box2 class which are not present. Instead check this in the div with box1 class and find the li elements

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

$('.box2').addClass(function(){

  return 'list' + $('.box1').find('li').length;

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>





<div class="box2">text</div>

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

edited 21 mins ago

answered 1 hour ago

ellipsis

7,6962929

answered 1 hour ago

ellipsis

7,6962929

answered 1 hour ago

ellipsis

7,6962929

add a comment |

You can simply do this by following method

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

answered 1 hour ago

Sarabjit Singh

1169

add a comment |

You can simply do this by following method

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

answered 1 hour ago

Sarabjit Singh

1169

add a comment |

You can simply do this by following method

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

answered 1 hour ago

Sarabjit Singh

1169

You can simply do this by following method

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

$('.box2').addClass('list' + $('.box1 li').length);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<ul class="box1">

  <li>a</li>

  <li>b</li>

  <li>c</li>

</ul>

<div class="box2">text</div>

answered 1 hour ago

Sarabjit Singh

1169

answered 1 hour ago

Sarabjit Singh

1169

answered 1 hour ago

Sarabjit Singh

1169

answered 1 hour ago

Sarabjit Singh

1169

add a comment |

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