使用 JQuery 当 Content == “0” 时隐藏 Div？

Question

Trying to write a script that checks the content of a div, and if that content is exactly 0 than it hides the div. This is for an inbox system so that the count only shows if you have a new message. This is what I wrote:

 var count = $('.count').val(); if (count == '0') { $('.count').hide(); } else { $('.count').show(); }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <a href='index.php?act=UserCP&CODE=alerts'> <span class="count"><.-- |new_alerts| --></span> alerts</a> <a href='index?php?act=Msg&CODE=01'> <span class="count"><!-- |new_msg| --></span> inbox</a>

Site Where the Problem is Occurring.

The <!--|new_msg| --> <!--|new_msg| --> is part of the hosting site's user menu system. On the site it changes to a number, correlating to how many new alerts or new messages you have. Is this the reason? The div has an actual number on the site, so it should read that right?

Answer 1

I haven't figured out why but I have zero luck getting class selectors to work. Try setting an id on the element. And then...

var count = $(document).getElementById("#countId").textContent;
if (count == '0') { 
    $(document).getElementById("#countId").style.display = 'none'; 
} 
else { 
    $(document).getElementById("#countId").style.display = ''; 
}

Answer 2

If you've multiple .count elements this is exactly what count variable will return ^{[See The Next Code]} .. And for sure it will not match 0 at all

 $(document).ready(function(){ var count = $(".count").text().trim(); console.log(count); });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <span class="count">0</span> <span class="count">1</span> <span class="count">2</span>

The right way is to loop through the .count elements using .each or even .filter

 $(document).ready(function(){ $(".count").show(0).filter(function(){ return $(this).text().trim() == 0; }).hide(0); });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <span class="count">0</span> <span class="count">1</span> <span class="count">2</span>