"Javascript encountered an unrecognizable expression when trying to parse a single

Whenever this event occurs, I'm encountering a console error that states "unrecognized expression: .". Everything seems to be working fine so I'm not entirely sure what the issue is other than possibly a syntax error. Any suggestions or ideas on how to resolve this?

 $(".home-focus__services__list").on('mouseover', 'a', function(){
    const aClass = $(this).attr("class").split(/\s+/);
    const serviceObjectPhoto = aClass.filter(function(e) { 
        return e.indexOf("service-") > -1;
    });
    $(".home-focus__services__photo").children("." + serviceObjectPhoto).css({
        'opacity': '1'
    }

I suspect that the error might be related to

 .children("." + serviceObjectPhoto).css ///////

Unfortunately, I'm unsure how to go about resolving this apparent "problem.".

javascripthtmljquerycss

Answer №1

If you're in search of a specific class, utilizing a filter method can help narrow down the array to only those that match your criteria. Instead of referencing the first index of the array, it's more efficient to use the find method which stops once it finds a matching element.

Consider using find() for this purpose as it returns the value of the first element that satisfies the condition.

const serviceObjectPhoto = aClass.find(function(item) { 
    return item.includes("service-");
});

Answer №2

My response is based on several assumptions.

One approach is to add an event listener to any link with a class that starts with service. This will first set all photos to have an opacity of 0, and then based on the class of the clicked link, it will adjust the opacity of the corresponding group of photos to 1.

$(".home-focus__services__list").on('mouseover', 'a[class^=service]', function() {
  $(".home-focus__services__photo div[class^=service]").css({
    "opacity": 0
  });
  
  $(".home-focus__services__photo ." + $(this).prop("class")).css({
    'opacity': '1'
  });
});
div[class^=service] {
  opacity: 0
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="home-focus__services__list">
  <a class="service-1" href="">Service 1</a>
  <a class="service-2" href="">Service 2</a>
  <a class="service-3" href="">Service 3</a>
</div>

<div class="home-focus__services__photo">
  <div class="service-1">1</div>
  <div class="service-2">2</div>
  <div class="service-3">3</div>
</div>

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