SCRIPT5007: Unable to get property 'length' of undefined or null reference"

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  I am having the error above. It seems coming from the bold line. Need your help!

  function showSlides() {
      var i;
      slides = document.getElementsByClassName("mySlides");
      dots = document.getElementsByClassName("dot");
      for (i = 0; i < slides.length; i++) {
         slides[i].style.display = "none"; 
      }
      slideIndex++;
      if (slideIndex> slides.length) {slideIndex = 1}   
      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";
      setTimeout(showSlides, 8000); // Change image every 8 seconds
  }

  function plusSlides(position) {
      slideIndex +=position;
      if (slideIndex> slides.length) {slideIndex = 1}
      else if(slideIndex<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";
  }

  • Moved by Richard MuellerMVP Thursday, February 21, 2019 2:06 PM Not a Forums Issues question

  Thursday, February 21, 2019 12:02 PM