Establishing style guidelines for all elements within a group

I have a scenario where there is an unordered list containing 1 to 3 items within it. Unfortunately, this list is situated inside a fixed-height div with overflow: hidden.

<div id="container">
  <ul id="tweets">
    <li>
      Lorem ipsum dolor sit amet, consectetur 
      adipiscing elit. Etiam est nisi, congue 
      id pulvinar eget.
    </li>
    <li>
      Donec nisi dolor, molestie quis varius 
      a, dictum vel nunc. Morbi odio lorem, 
      viverra eu semper eu.
    </li>
    <li>
      Mollis ac lorem. Aenean consequat 
      interdum mi, nec vestibulum metus mollis 
      non. Curabitur sed.
    </li>
  </ul>
</div>

If the list contains exactly 3 items, the line-height must not exceed 1em to fit perfectly in the container. If less than three items are present, the line-height can be up to 1.5em to align with the overall site design.

I am attempting to use jQuery to dynamically adjust the line-height.

var tweet_len = $("#tweets > li").size();
if (tweet_len == 0) {
    // append a message indicating no tweets available
    // (this message resembles a tweet and has line-height: 1.5em)
} else if (tweet_len > 0 && tweet_len < 3) {
    $("#tweets li").each(function(){
        $(this).css("line-height: 1.5em");
    });
}

I attempted to utilize the code above (lines 6-8) but encountered issues. (I suspect I lack a full grasp on how to use .each().)

Can you provide guidance on the correct code for lines 6-8 to update the line-height to 1.5em?

javascriptjqueryhtmlcss

Answer №1

According to the jQuery API documentation:

css( propertyName, value )

This means that the following code should be functional:

$(this).css("line-height",  "1.5em");

Answer №2

While all the other suggestions are acceptable, there is also an alternative method to implement the CSS styling without the need for manual iteration:

$("#tweets li").css("line-height", "1.5em");

Answer №3

make sure you provide 2 arguments when using the css function:

$(this).css("line-height", "1.5em");

Answer №4

Why waste time with javascript when you can achieve the same result more efficiently with css?

CSS:

#tweets {line-height: 1.5}
#tweets.long-list {line-height: 1}

Keep in mind that the line-height is applied to the UL (not the LIs) because it is inherited. Be sure to remove any rule explicitly setting the line-height on LIs. If you are unable to do so, target the LI's like this:

#tweets li {line-height: 1.5}
#tweets.long-list li {line-height: 1}

Now, let's see the small piece of javascript:

var $tweets = $("#tweets"),  // save for reuse
    tweet_len = $tweets.children().size();


if (!tweet_len) {
    // append a message informing the user there are no tweets
} else if (tweet_len > 3) {
    // only change things when needed
    // without excessive dom traversal
    $tweets.addClass('long-list');
}

If this code is running "live" (e.g. using setInterval() or inside live() or delegate() callbacks) and the number of rows can decrease, remember to remove the added class explicitly:

if (tweet_len > 3) {
    $tweets.addClass('long-list');
} else {
    $tweets.removeClass('long-list');
    if (!tweet_len) {
        // append a message letting the user know there are no tweets
    }
}

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