Utilize JavaScript to assign a button with identical functionality as another button

After developing a slick slider, I decided to add custom arrows. The standard method from slick involves using prevArrow: and nextArrow:, but I wanted the buttons outside of the slick-slider container. To achieve this, I placed additional prev and next buttons outside the container and used JavaScript to give them functionality similar to the default ones. However, I encountered an error with the JavaScript portion which stated "Cannot read property 'click' of null at HTMLButtonElement." How can this error be resolved?

html

     <div class="mates">
         <button class="prev-g" id="prev-gg">prev</button>
         <button class="next-g" id="next-gg">next</button>
     
         <div class="mates-container" id="mates-containerrr">
             <button class="prev-h" id="prev-hh">prev</button>
             <button class="next-h" id="next-hh">next</button>
         </div>
    </div>
    <script type="text/javascript">
        $(document).ready(function(){
            $('.mates-container').slick({
                infinite: true,
                speed: 450,
                slidesToShow: 1,
                slidesToScroll: 1,
                prevArrow: "<button class='prev-h' id='prev-hh'>prev</button>",
                nextArrow: "<button class='next-h' id='next-hh'>next</button>",
            }); 
        });

   </script>
   <script type="text/javascript">
       const badBtn = document.getElementById("next-hh");
       const editedBtn = document.getElementById("next-gg");

       editedBtn.addEventListener("click", function() {
           badBtn.click();
       });
   </script>

If you require more code or have any inquiries, please feel free to leave a comment!

Answer №1

It is important to ensure that your script is enclosed within

$(document).ready(function(){...})
. Placing it outside of the ready function may cause the script to execute without taking into account whether the element has been rendered or not, resulting in an error message such as
Cannot read property 'click' of null at HTMLButtonElement

<script type="text/javascript">
    $(document).ready(function(){
        const badBtn = document.getElementById("next-hh");
        const editedBtn = document.getElementById("next-gg");
    
        editedBtn.addEventListener("click", function() {
            badBtn.click();
        });
    });
</script>

I hope this explanation proves helpful!

Answer №2

Before querying the document for the badBtn, ensure that the slick slider has finished loading and rendered its HTML into the page DOM. It is important to wrap your custom code after the slick slider has been initialized.

<script type="text/javascript">
  $(document).ready(function(){
    $('.mates-container')
      .slick({
        ...,
        init: function() {
          const badBtn = document.getElementById("next-hh");
          const editedBtn = document.getElementById("next-gg");
    
          editedBtn.addEventListener("click", function() {
          badBtn.click();
        }
      });
  });
</script>

Answer №3

In my opinion, it is best to utilize the id rather than the class name when selecting elements ($('.mates-container')).

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