What is the best way to incorporate a CSS transition without any dynamic property changes?

Question

What is the best way to incorporate a CSS transition without any dynamic property changes?

Is there a way to add a transition effect to a header when its size changes without a specified height value in the CSS? The header consists of only text with top and bottom padding, so as the text changes, the height adjusts accordingly. How can I implement a smooth transition in this scenario? Let me illustrate my query with some code:

$(document).ready(function() {
    $('.header').click(function() {
      if ($('.header').html() == 'Hello World (Click this header)') {
          $('.header').html('Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Praesent dapibus. Nullam eget nisl. Nunc auctor. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Praesent vitae arcu tempor neque lacinia pretium. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Duis sapien nunc, commodo et, interdum suscipit, sollicitudin et, dolor. Curabitur ligula sapien, pulvinar a vestibulum quis, facilisis vel sapien. Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur? Sed ac dolor sit amet purus malesuada congue. Pellentesque arcu.');
      } else {
          $('.header').html('Hello World (Click this header)');
      }
  });
});

.header {
  color: #fff;
  font-family: helvetica;
  position: fixed;
  right: 0px;
  left: 0px;
  top: 0px;
  padding: 30px 15px;
  background-color: #4d5366;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  user-select: none;
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="header">Hello World (Click this header)</nav>

javascript html css css-transitions

Answer 1

Answer №1

One solution could be to adjust the bottom value in order to control the height:

$(document).ready(function() {
  $('.header').css('bottom', 'calc(100vh - ' + $('.header div').css('height') + ' - 60px)')
  $('.header').click(function() {
    if ($('.header div').html() == 'Hello World (Click this header)') {
      $('.header div').html('Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Praesent dapibus. Nullam eget nisl. Nunc auctor. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Praesent vitae arcu tempor neque lacinia pretium. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Duis sapien nunc, commodo et, interdum suscipit, sollicitudin et, dolor. Curabitur ligula sapien, pulvinar a vestibulum quis, facilisis vel sapien. Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur? Sed ac dolor sit amet purus malesuada congue. Pellentesque arcu.');
    } else {
      $('.header div').html('Hello World (Click this header)');
    }
    $('.header').css('bottom', 'calc(100vh - ' + $('.header div').css('height') + ' - 60px)')
  });
});

.header {
  color: #fff;
  font-family: helvetica;
  position: fixed;
  width: 100%;
  left: 0px;
  top: 0px;
  padding: 30px 15px;
  box-sizing: border-box;
  background-color: #4d5366;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  user-select: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="header">
  <div>Hello World (Click this header)</div>
</nav>

Answer 2

One solution could be to adjust the bottom value in order to control the height:

$(document).ready(function() {
  $('.header').css('bottom', 'calc(100vh - ' + $('.header div').css('height') + ' - 60px)')
  $('.header').click(function() {
    if ($('.header div').html() == 'Hello World (Click this header)') {
      $('.header div').html('Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Praesent dapibus. Nullam eget nisl. Nunc auctor. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Praesent vitae arcu tempor neque lacinia pretium. Morbi leo mi, nonummy eget tristique non, rhoncus non leo. Duis sapien nunc, commodo et, interdum suscipit, sollicitudin et, dolor. Curabitur ligula sapien, pulvinar a vestibulum quis, facilisis vel sapien. Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur? Sed ac dolor sit amet purus malesuada congue. Pellentesque arcu.');
    } else {
      $('.header div').html('Hello World (Click this header)');
    }
    $('.header').css('bottom', 'calc(100vh - ' + $('.header div').css('height') + ' - 60px)')
  });
});

.header {
  color: #fff;
  font-family: helvetica;
  position: fixed;
  width: 100%;
  left: 0px;
  top: 0px;
  padding: 30px 15px;
  box-sizing: border-box;
  background-color: #4d5366;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  user-select: none;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="header">
  <div>Hello World (Click this header)</div>
</nav>

Answer 3

Answer №2

If you're looking to adjust the height of the .header element, start by setting it to auto. When its content changes, retrieve the height of .header with jQuery using

var headerHeight = $('.header').outerHeight();

, and then set the height of .header to this value instead of auto by using

$('.header').css({'height': headerHeight})

. Remember to reset the height to auto each time new content is added in order to accurately capture the updated height of the .header div.

Additionally, consider adding a transition effect to .header like so:

transition: height 0.25s ease-in-out;

. Feel free to reach out if you need further assistance or clarification on your original query. :)

Answer 4

If you're looking to adjust the height of the .header element, start by setting it to auto. When its content changes, retrieve the height of .header with jQuery using

var headerHeight = $('.header').outerHeight();

, and then set the height of .header to this value instead of auto by using

$('.header').css({'height': headerHeight})

. Remember to reset the height to auto each time new content is added in order to accurately capture the updated height of the .header div.

Additionally, consider adding a transition effect to .header like so:

transition: height 0.25s ease-in-out;

. Feel free to reach out if you need further assistance or clarification on your original query. :)

Answer 5

Answer №3

When swapping text, it happens instantly without waiting for the screen to refresh. If you don't specifically set the height of an element in the inline or stylesheet, the element won't resize when the text is swapped.

To work around this issue, you can measure the dimensions of your header with both long and short text snippets, save those values, and then explicitly set the height of the element when the text swap occurs based on each state.

Here's a simple explanation using vanilla JavaScript...

<!-- HTML -->
<div id="header" class="offpage">Hello World!</div>

/*** CSS ***/
#header {
    position: fixed;
    right: 0; left: 0; top: 0;
    height:auto;

    color: #fff;
    background-color: #4d5366;

    font-family: helvetica;
    font-size:1rem;
    line-height:1.6;

    padding: 2rem 1rem;

    cursor: pointer;
    transition: all 0.3s ease-in-out;
    user-select: none;
    overflow: hidden;
}
#header.offpage {
    top: -110%;
}

/*** JS ***/
var text = {
    longText: "Lorem ipsum dolor sit amet...",
    shortText: "Hello World!"
};

var header;

function setHeaderDimensions() {
    /* Get the height of default text 
       and store it in an inline data-* attribute */
    var headerHeight = header.clientHeight
    header.setAttribute("data-dims-shortText", headerHeight);

    /* Swap text and get the height of longText */
    header.textContent = text.longText;
    header.setAttribute("data-dims-longText", header.clientHeight);

    /* Reset default text */
    header.textContent = text.shortText;

    /* Define explicit height for the default state */
    header.style.height = headerHeight + "px";

    /* Display on the page */
    header.classList.remove("offpage");
}

function changeHeaderText(e) {
    /* Check the current state */
    var flag = header.classList.contains("long");

    /* Set text accordingly */
    header.textContent = text[flag ? "shortText" : "longText"];

    /* Get the required stored height */
    header.style.height = header.getAttribute(
        flag ? "data-dims-shortText" : "data-dims-longText"
    ) + "px";

    /* Toggle state */
    header.classList.toggle("long");

}

function onPageLoaded() {
    header = document.getElementById("header");

    /* Get and set #header dimensions
       for each text-state (long & short) */
    setHeaderDimensions();

    /* Add event handler */
    header.addEventListener("click", changeHeaderText, !1);
}

document.addEventListener("DOMContentLoaded", onPageLoaded, !1);

That's the concept. Hopefully, you can use this as a starting point and customize it further. :D

Answer 6

When swapping text, it happens instantly without waiting for the screen to refresh. If you don't specifically set the height of an element in the inline or stylesheet, the element won't resize when the text is swapped.

To work around this issue, you can measure the dimensions of your header with both long and short text snippets, save those values, and then explicitly set the height of the element when the text swap occurs based on each state.

Here's a simple explanation using vanilla JavaScript...

<!-- HTML -->
<div id="header" class="offpage">Hello World!</div>

/*** CSS ***/
#header {
    position: fixed;
    right: 0; left: 0; top: 0;
    height:auto;

    color: #fff;
    background-color: #4d5366;

    font-family: helvetica;
    font-size:1rem;
    line-height:1.6;

    padding: 2rem 1rem;

    cursor: pointer;
    transition: all 0.3s ease-in-out;
    user-select: none;
    overflow: hidden;
}
#header.offpage {
    top: -110%;
}

/*** JS ***/
var text = {
    longText: "Lorem ipsum dolor sit amet...",
    shortText: "Hello World!"
};

var header;

function setHeaderDimensions() {
    /* Get the height of default text 
       and store it in an inline data-* attribute */
    var headerHeight = header.clientHeight
    header.setAttribute("data-dims-shortText", headerHeight);

    /* Swap text and get the height of longText */
    header.textContent = text.longText;
    header.setAttribute("data-dims-longText", header.clientHeight);

    /* Reset default text */
    header.textContent = text.shortText;

    /* Define explicit height for the default state */
    header.style.height = headerHeight + "px";

    /* Display on the page */
    header.classList.remove("offpage");
}

function changeHeaderText(e) {
    /* Check the current state */
    var flag = header.classList.contains("long");

    /* Set text accordingly */
    header.textContent = text[flag ? "shortText" : "longText"];

    /* Get the required stored height */
    header.style.height = header.getAttribute(
        flag ? "data-dims-shortText" : "data-dims-longText"
    ) + "px";

    /* Toggle state */
    header.classList.toggle("long");

}

function onPageLoaded() {
    header = document.getElementById("header");

    /* Get and set #header dimensions
       for each text-state (long & short) */
    setHeaderDimensions();

    /* Add event handler */
    header.addEventListener("click", changeHeaderText, !1);
}

document.addEventListener("DOMContentLoaded", onPageLoaded, !1);

That's the concept. Hopefully, you can use this as a starting point and customize it further. :D

What is the best way to incorporate a CSS transition without any dynamic property changes?

Answer №1

Answer №2

Answer №3

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