Convert this into EXTERNAL JAVASCRIPT FILE

Question

They actually have an inline javascript code and I am trying to convert it to an external javascript file. I want to get rid of my onclicks but I dont know how to rewrite my JS to be external. Here's the code I'm working at.

</div>
                        <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
                        <a class="next" onclick="plusSlides(1)">&#10095;</a>
                    </div>
                    <br>

                    <div style="text-align:center">
                        <span class="dot" onclick="currentSlide(1)"></span> 
                        <span class="dot" onclick="currentSlide(2)"></span> 
                        <span class="dot" onclick="currentSlide(3)"></span> 
                        <span class="dot" onclick="currentSlide(4)"></span>
                    </div>

 <script> let slideIndex = 1; showSlides(slideIndex); function plusSlides(n) { showSlides(slideIndex += n); } function currentSlide(n) { showSlides(slideIndex = n); } function showSlides(n) { let i; const slides = document.getElementsByClassName("mySlides"); const dots = document.getElementsByClassName("dot"); if (n > slides.length) {slideIndex = 1} if (n < 1) {slideIndex = slides.length} for (i = 0; i < slides.length; i++) { slides[i].style.display = "none"; } for (i = 0; i < dots.length; i++) { dots[i].className = dots[i].className.replace(" active", ""); } slides[slideIndex-1].style.display = "block"; dots[slideIndex-1].className += " active"; } </script>

Answer 1

Simply, create js file. Like, script.js . Then, add your javascrript code inside the script.js . In script.js :

    let slideIndex = 1;
    showSlides(slideIndex);
    function plusSlides(n) {
        showSlides(slideIndex += n);
    }
    function currentSlide(n) {
        showSlides(slideIndex = n);
    }
    function showSlides(n) {
    let i;
    const slides = document.getElementsByClassName("mySlides");
    const dots = document.getElementsByClassName("dot");
    if (n > slides.length) {slideIndex = 1}    
    if (n < 1) {slideIndex = slides.length}
    for (i = 0; i < slides.length; i++) {
        slides[i].style.display = "none";  
    }
    for (i = 0; i < dots.length; i++) {
        dots[i].className = dots[i].className.replace(" active", "");
    }
    slides[slideIndex-1].style.display = "block";  
        dots[slideIndex-1].className += " active";
    }

Now, add the external file to the html file. Like:

<script src="script.js"></script>

You, can add this linking line in the head or at the bottom of body.

*Note:- If you add at the top ie, head, then script will load first before the document inside body. Else, it will load after on.