Why does reading localStorage values require a page refresh to show CSS changes toggled by jQuery?

Question

I'm trying to use the value of localStorage to display one of two Twitter feeds, one for a light mode theme, the other for dark mode. It works, but I have to refresh the webpage for the correct CSS - either twitter-dark-display-none or twitter-light-display-none - to work.

Using jQuery(document).ready(function () doesn't help.

The Fiddle: https://jsfiddle.net/zpsf5q3x/2/ But the sample tweets don't show due to JSFiddle limits on displaying third party frames. And, localstorage may not work there, either.

Fiddle calls two external libraries: https://cdn.jsdelivr.net/gh/gitbrent/[email protected]/css/bootstrap4-toggle.min.css and https://cdn.jsdelivr.net/gh/gitbrent/[email protected]/js/bootstrap4-toggle.min.js

HTML:

Note the data-theme="dark" in the first block.

<div class="twitter-dark-display-none">
<a class="twitter-timeline" data-width="170" data-height="200" data-theme="dark"
 data-tweet-limit="1" data-chrome="transparent nofooter noborders" href="https://twitter.com/StackOverflow?ref_src=twsrc%5Etfw">Tweets</a>
</div>

<div class="twitter-light-display-none">
<a class="twitter-timeline" data-width="170" data-height="200" data-tweet-limit="1" data-chrome="transparent nofooter noborders" href="https://twitter.com/StackOverflow?ref_src=twsrc%5Etfw">Tweets</a>
</div>

jQuery:

Overall function that uses localStorage to toggle the entire site between dark and normal mode.

$('body').toggleClass(localStorage.toggled);
function darkLight() {
  if (localStorage.toggled != 'dark') {
    $('body').toggleClass('dark', true);
    localStorage.toggled = "dark";
  } else {
    $('body').toggleClass('dark', false);
    localStorage.toggled = "";
  }
}

What I'm trying to use to toggle CSS:

  if (localStorage.toggled === 'dark') {
    
        $('.twitter-light-display-none').addClass("display-none");
        $('.twitter-dark-display-none').addClass("display-block");
    
      } else {
    
        $('.twitter-dark-display-none').addClass("display-none");
        $('.twitter-light-display-none').addClass("display-block");
    
    }

CSS:

.display-none {
    display: none !important;
}

.display-block {
    display: block !important;
}

---

Edit 10/24/2020:

johannchopin's answer works, with the addition of $('body').toggleClass(localStorage.toggled); as in my original code above.

But. There is some sort of conflict with the gitbrent dark mode JS and CSS libraries, so I switched to https://github.com/coliff/dark-mode-switch and that results in a simpler way to both toggle dark mode and use localstorage in addition to the function johannchopin provided to switch between twitter widget divs:

<script>

(function() {
  var darkSwitch = document.getElementById("darkSwitch");
  if (darkSwitch) {
    initTheme();
    darkSwitch.addEventListener("change", function(event) {
      resetTheme();
    });
    function initTheme() {
      var darkThemeSelected =
        localStorage.getItem("darkSwitch") !== null &&
        localStorage.getItem("darkSwitch") === "dark";
      darkSwitch.checked = darkThemeSelected;
      darkThemeSelected
        ? document.body.setAttribute("data-theme", "dark")
        : document.body.removeAttribute("data-theme");
    }
    function resetTheme() {
      if (darkSwitch.checked) {
        document.body.setAttribute("data-theme", "dark");
        localStorage.setItem("darkSwitch", "dark"); 
} else {
        document.body.removeAttribute("data-theme");
        localStorage.removeItem("darkSwitch");  
      }
  updatedarkSwitch();
    }
  }
})();

function updatedarkSwitch() {
  if (localStorage.darkSwitch === 'dark') {
    $('.twitter-light-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-dark-display-none').addClass("display-block").removeClass('display-none');
  } else {
    $('.twitter-dark-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-light-display-none').addClass("display-block").removeClass('display-none');
  }
}
updatedarkSwitch()
</script>

And then use the most basic dark mode rule in the style sheet:

[data-theme="dark"] {
background-color: #000000 !important;
}

and also add any other more specific CSS rules needed, i.e.

[data-theme="dark"] .post-title{
color:#fff !important;
}

Answer 1

You have multiple issues in you code. First, you toggle the CSS, but only when the page loads because this code is only run once (when the script is loaded):

if (localStorage.toggled === 'dark') {
  // ...

Just move this script in the function (ex: updateInterfaceTheme) that you call at the end of darkLight().

Another issue is that you forget to clean the previous class and that leads to a styling conflict:

$('.twitter-light-display-none').addClass("display-none"); // class .display-block still exist
$('.twitter-dark-display-none').addClass("display-block"); // class .display-none still exist

So don't forget to clean them:

 if (localStorage.toggled === 'dark') {
    $('.twitter-light-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-dark-display-none').addClass("display-block").removeClass('display-none');
  } else {
    $('.twitter-dark-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-light-display-none').addClass("display-block").removeClass('display-none');
  }

And like that it's working:

function darkLight() {
  if (localStorage.toggled !== 'dark') {
    $('body').toggleClass('dark', true);
    localStorage.toggled = "dark";
  } else {
    $('body').toggleClass('dark', false);
    localStorage.toggled = "";
  }

  updateInterfaceTheme();
}

function updateInterfaceTheme() {
  if (localStorage.toggled === 'dark') {
    $('.twitter-light-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-dark-display-none').addClass("display-block").removeClass('display-none');
  } else {
    $('.twitter-dark-display-none').addClass("display-none").removeClass('display-block');
    $('.twitter-light-display-none').addClass("display-block").removeClass('display-none');
  }
}

updateInterfaceTheme()

.display-none {
  display: none !important;
}

.display-block {
  display: block !important;
}

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

<label class="switch"><span class="switchtext">Dark</span>
  <input type="checkbox" data-style="ios" data-onstyle="outline-secondary" data-offstyle="outline-secondary" data-size="sm" data-toggle="toggle" onchange="darkLight()">
  <span class="slider"></span><span class="switchtext">Mode</span>
</label>

<div class="twitter-dark-display-none">Dark Mode
  <a class="twitter-timeline" data-width="170" data-height="200" data-theme="dark" data-tweet-limit="1" data-chrome="transparent nofooter noborders" href="https://twitter.com/StackOverflow?ref_src=twsrc%5Etfw">Tweets</a>
</div>

<div class="twitter-light-display-none">Light Mode
  <a class="twitter-timeline" data-width="170" data-height="200" data-tweet-limit="1" data-chrome="transparent nofooter noborders" href="https://twitter.com/StackOverflow?ref_src=twsrc%5Etfw">Tweets</a>
</div>

Checkout the jsfiddle to see it working with localStorage.