Is it possible to adjust the background color based on the current time of day?

I have successfully designed a visually appealing website using HTML5, CSS, and Bootstrap. I am interested in finding a way to automatically change the background color and navigation bar selection color based on the time of day - blue during the day and dull red during the night. Is there a way to dynamically change the colors of the navigation bar and background based on the user's local time? Here is the code snippet I have implemented:

<body>
    <nav>
        <h1 style="font-family:Helvetica;">
            <ul class="nav">
                <li><a href="#">Menu 1</a>
                    <ul>
                        <li><a href="#">Sub-menu Item 1</a></li>
                        <li><a href="#">Sub-menu Item 2</a></li>
                        <li><a href="#">Sub-menu Item 3</a></li>
                    </ul>
                </li>
                <li><a class="dropdown" href="#">Menu 2</a>
                    <ul>
                        <li><a href="#">Sub-menu Item 1</a></li>
                        <li><a href="#">Sub-menu Item 2</a></li>
                        <li><a href="#">Sub-menu Item 3</a></li>
                    </ul>
                </li>
                <li><font size="+4", color="white">IBAE</font> <br></li>
                <li><a href="#">Menu 3</a>
                    <ul>
                        <li><a href="#">Sub-menu Item 1</a></li>
                        <li><a href="#">Sub-menu Item 2</a></li>
                        <li><a href="#">Sub-menu Item 3</a></li>
                    </ul>
                </li>
                <li><a href="#">Menu 4</a>
                    <ul>
                        <li><a href="#">Sub-menu Item 1</a></li>
                        <li><a href="#">Sub-menu Item 2</a></li>
                        <li><a href="#">Sub-menu Item 3</a></li>
                    </ul>
                </li>
            </ul>
        </h1>
    </nav>
    <br>
    <br>
    <br>
    <br>
    <br>

   <div class="container-fluid"> <!-- Cards-->
        <div class="row">
                <!--row one column two-->
                <div class="col-sm-3"><div class="cardpop">
                        <div class="card img-fluid" style="width:600px">
                            <img class="card-img-top" src="/Users/jeevabharathi/Desktop/test.jpg" alt="Card image" style="width:100%">
                            <div class="card-img-overlay">
                                <font color="white">
                                    <h4 class="card-title">John Doe</h4>
                                    <p class="card-text">Some example text some example text. Some example text some example text. Some example text some example text. Some example text some example text.</p>
                                    <a href="#" class="btn btn-primary">See Profile</a>
                                </font>
                            </div>
                        </div></div>
                </div>



    <script   src="https://code.jquery.com/jquery-3.3.1.js"   integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60="   crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</body>

Here's the CSS styling:

nav h1 
    {
        vertical-align: middle;   
        background-color: rgb(0, 0, 0);
        border: 10px solid rgba(0, 0, 0, 0);
        text-align: center;
        position: fixed;
        position: top;
        min-width: 100%;
        z-index: 3;

    }
.nav ul 
{
    vertical-align: middle;
    -webkit-font-smoothing:antialiased;
    text-shadow:0 1px 0 rgba(255, 255, 255, 0);
    background: rgb(0, 0, 0);
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    z-index: 3;
}

.card-img-wrap img {
  transition: transform .25s;
  width: 100%;
}
.card-img-wrap:hover img {
  transform: scale(1.2);
}
.card-img-wrap:hover:after {
  opacity: 1;
}

I am seeking assistance on how to achieve the functionality I described above. Can this be done using only CSS or do I need to incorporate JavaScript? If JavaScript is necessary, can you provide resources, code examples, or tutorials to help me implement this feature? I greatly appreciate any guidance you can offer. Thank you.

Answer №1

To efficiently change the background colors based on the time of day, you can utilize the setInterval method in JavaScript. This method will call a function every minute that uses the Date object to determine the current time and adjust the background colors accordingly.

Ensure to also call this function when the page initially loads to set the correct colors.

For reference, below is a snippet of sample code to implement this functionality:

function init() {
  function setBackgroundForTimeOfDay() {
    const body = document.querySelector('body');
    const hours = new Date().getHours();

    if (hours < 6 || hours >= 18)
      body.style['background-color'] = '#900';
    else
      body.style['background-color'] = '#46F';
  }

  setBackgroundForTimeOfDay();
  setInterval(setBackgroundForTimeOfDay, 60000);
}

You can view a live example in this Plunker link: http://plnkr.co/edit/dq0nGUMvgTyHVXplrq1d?p=preview

Answer №2

The main question here is whether it is feasible to adjust a CSS Style depending on the time of day.

There are various approaches to tackle this issue, but for optimal user interaction, it is advisable to establish the style during HTML generation. This could entail assigning a class to the body element on the server-side to indicate the selection of the Night Time theme. Alternatively, you can embed the style directly, although separating styles externally is generally preferred.

Another alternative is to implement this change within the user's browser using JavaScript. Simply assign a class or apply the style inline. JavaScript offers the advantage of adapting to the user's local time; however, an inaccurate system clock could result in displaying an incorrect theme. Moreover, this method eliminates the need to detect the user's time zone on the server-side, which can be beneficial for accommodating users from diverse regions.

Answer №3

If you want something similar to this, setting the interval to 1000 (meaning 1 second) could work, but you may need to adjust it to make it less frequent.

setInterval(()=>{
        var color=new Date().getHours()>16?'red':'blue'
        document.querySelector('.nav').style.background=color
}, 1000)

For the best way to customize your navbar, check out this helpful stack overflow link: Change navbar color in Twitter Bootstrap

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