计算班数

Question

我制作了具有多个选项的过滤器。如您所见，有时没有结果。我说：“没有结果。”作为用户反馈，将其反馈给访问者。

现在，我想向访问者显示过滤器选项中已有的结果数量。例如：显示全部（10）或教育（1）。这样，用户便知道了自己的期望，而不会选择空的过滤器。

但是有些事情使它变得非常复杂：数字可以通过某些组合来改变。例如：如果选择过滤器一，则过滤器二的选项更少。等

有人可以帮助我吗？

$("select.filterby").change(function() {
  var filters = $.map($("select.filterby").toArray(), function(e) {
    return $(e).val();
  }).join(".");
  $("div#FilterContainer").find("div.job-offer-card").hide();
  if ($("div#FilterContainer").find("div.job-offer-card." + filters).length) {
    $("div#FilterContainer").find("div.job-offer-card." + filters).show();

  } else {
    $("div#FilterContainer").find("div.noresults").show();
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<span> View by:</span>


    <label for="location">Location</label>
    <select id="location" class="filterby">
       <option value="all">Show All</option>
       <option value="australia">Australia</option>
       <option value="singapore">Singapore</option>
       <option value="newzealand">New Zealand</option>
       <option value="usa">USA</option>
       <option value="uk">UK</option>
       <option value="vietnam">Vietnam</option>
       <option value="global">Global</option>
       <option value="othercountry">Other</option>
    </select>


    <label for="type">Type</label>
    <select id="type" class="filterby">
       <option value="all">Show All</option>
       <option value="accommodation">Accommodation</option>
       <option value="app">App/Technology</option>
       <option value="business">Business</option>
       <option value="health">Health</option>
       <option value="hospitality">Hospitality</option>
       <option value="education">Education</option>
       <option value="retail">Retail</option>
       <option value="services">Services</option>
       <option value="travel">Travel</option>
    </select>

    <label for="code">Code</label>
    <select id="code" class="filterby">
       <option value="all">Show All</option>
       <option value="001">001</option>
       <option value="002">002</option>
       <option value="003">003</option>
       <option value="004">004</option>
    </select>

<div id="FilterContainer">
  <div class="job-offer-card noresults">
    <p>no results</p>
  </div>
  <div class="job-offer-card all vietnam accommodation travel 004">
    <p>1 all vietnam accommodation travel</p>
  </div>
  <div class="job-offer-card all vietnam  travel 003">
    <p>2 all vietnam travel</p>
  </div>
  <div class="job-offer-card all vietnam accommodation travel">
    <p>3 all vietnam accommodation travel</p>
  </div>
  <div class="job-offer-card all australia accommodation travel 003">
    <p>4 all australia accommodation travel</p>
  </div>
  <div class="job-offer-card all australia education">
    <p>5 all australia</p>
  </div>
  <div class="job-offer-card all vietnam newzealand usa accommodation">
    <p>6 all vietnam accommodation</p>
  </div>
  <div class="job-offer-card all vietnam accommodation travel">
    <p>7 all vietnam accommodation travel</p>
  </div>
  <div class="job-offer-card all vietnam  travel">
    <p>8 all vietnam travel</p>
  </div>
  <div class="job-offer-card all vietnam accommodation travel">
    <p>9 all vietnam accommodation travel</p>
  </div>
  <div class="job-offer-card all australia accommodation travel">
    <p>10 all australia accommodation travel</p>
  </div>
  <div class="job-offer-card all australia health 001">
    <p>11 all australia</p>
  </div>
  <div class="job-offer-card all vietnam accommodation 002">
    <p>12 all vietnam accommodation</p>
  </div>
</div>

Answer 1

任何jquery对象的length属性将包含元素数量。您已经使用过了。

如果要将数字添加到每个选项，则可以循环浏览所有选项并计算每种情况。

$("select.filterby option").each(function() {
    var t=$(this),
        val=t.val(),
        text=t.text(),
        count=$("#FilterContainer").find("div.job-offer-card."+val).length;
    v.text(text+" ("+val+")");
});