I need to remove and add a class between elements of a list, if I hit the #swapThumb
button it should remove the selected
class from the current element and then added to the next element.
Here's what I have
html
<ul id="product-thumbnails" class="thumbnails list-inline">
<li class="vtmb vt-123 selected" style="">
<a href="/uno"><img src="https://via.placeholder.com/100x100"></a>
</li>
<li class="vtmb vt-456" style="">
<a href="/dos"><img src="https://via.placeholder.com/100x100"></a>
</li>
<li class="vtmb vt-789" style="display: none">
<a href="/tres"><img src="https://via.placeholder.com/100x100"></a>
</li>
<li class="vtmb vt-101" style="">
<a href="/cuatro"><img src="https://via.placeholder.com/100x100"></a>
</li>
<li class="vtmb vt-121" style="display: none">
<a href="/cinco"><img src="https://via.placeholder.com/100x100"></a>
</li>
</ul>
<button id="swapThumb">Next</button>
javascript
let thumbsNailsList = $('#product-thumbnails').find('li');
let swapButton = $('#swapThumb');
thumbsNailsList.each((index, item) => {
let thumbsAvailable = $(item).attr('style');
if (thumbsAvailable === '') {
$(swapButton).on('click', () => {
$(item).removeClass('selected');
$(item).closest($(item)).next().addClass('selected');
});
}
});
First I'm checking if the li
element has an empty style
attribute (this is needed), if so, trigger the click validation.
The click should remove the selected
class from the first element and then added to the next one and so on (it should match the empty style
attribute). Once the selected
class hits the last element of the list
it should return the class to the first element.
This code snippet will change the class of the element beneath it to selected and remove it from the current one, while keeping all the other classes. It will also loop back to the beginning element if next
is clicked when on the last element. I've heard jQuery functions are more expensive that document functions and shouldn't be used for these kinds of things. Apply this to your problem and you should get the expected result
let i = 0; let thumbsNailsList = document.getElementById("product-thumbnails").children; let btn = document.getElementById("btn"); btn.onclick = function() { var prevClasses = thumbsNailsList[i].className; thumbsNailsList[i].className = prevClasses.replace("selected", ""); i = (i+1) % thumbsNailsList.length; thumbsNailsList[i].className = "selected"; console.log(thumbsNailsList); }
<ul id="product-thumbnails"> <li class='selected'></li> <li class=''></li> <li class=''></li> <li class=''></li> </ul> <button id="btn">Next</button>
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