Using jQuery to update a specific item in a list

My current project involves developing an Image Gallery app. It uses <img> tags within li elements.

The code snippet is as follows:

var $slideR_wrap = $(".slideRoller_wrapper");
var $slidesRoller = $slideR_wrap.find(".slidesRoller");
var $slideRoller = $slidesRoller.find(".slideRoller");
var $sliderImage = $slideRoller.find(".rollerImage");
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="slideRoller_wrapper">
  <ul class="slidesRoller" id="slidesRoller">
    <li class="slideRoller">
      <img class="rollerImage" src="../../assets/img/slider/1.jpg">
    </li>
    <li class="slideRoller">
      <img class="rollerImage" src="../../assets/img/slider/2.jpg">
    </li>
    <li class="slideRoller">
      <img class="rollerImage" src="../../assets/img/slider/3.jpg">
    </li>
    <li class="slideRoller">
      <img class="rollerImage" src="../../assets/img/slider/4.jpg">
    </li>
  </ul>
</div>

I am trying to target a specific element of the li as an array element.

When I used console.log($sliderImage), it returned an array of all the images. However, when I attempted to apply styles like

$(".rollerImage")[0].css('opacity','1');
, it resulted in an error:

Uncaught TypeError: $(...)[0].css is not a function.

I need assistance with accessing a particular image within a specific li by using an array index.

This is the final step of my project and I really hope to resolve this without changing the entire logic and starting over.

Answer №2

To refine the $elements array, you have the option to filter it:

$(".rollerImage").filter(function(i, $el){return i===0}).css('opacity','1');

Answer №3

$('.slideRoller').eq( $index ).css('opacity','1')

The variable $index represents the position of "li"

$('.slideRoller').eq( 0 ).css('opacity','1')

Answer №4

One way to iterate through the list elements is by using the each() function.

$("#slidesRoller").each()
var items = [];
$('#slidesRoller').children('list').each(function () {
    items.push(this);
});
console.log(items); // This array contains all the `List` tags.
console.log($(items[0]).find("img")) // Get the image within the first list.
$(items[0]).find("img").css("opacity", "0") // Set opacity of the image.

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