如果找不到结果，请显示div

Question

我有此代码。 http://jsfiddle.net/n3EmN/171/ 当某些复选框被选中并且没有找到结果时，如何显示div并在找到结果时隐藏该div？例如，当我检查复选框“红色”和复选框“非洲”，没有找到结果，所以现在我必须显示一个div，我该怎么做？

HTML

<div class="flowers-wrap"> 

    <h3 style="font-size:14px; font-weight:normal;">Available Flowers</h3> 
    <p style="font-size:12px;"><strong>Filter flowers by colour:</strong></p> 
    <form> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="red" id="red" /> Red</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="yellow" id="yellow" /> Yellow</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="pink" id="pink" /> Pink</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="purple" id="purple" /> Purple</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="green" id="green" /> Green</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-colour" value="other" id="other" /> Other</label> 
    </form> 
    <p style="font-size:12px;"><strong>Filter flowers by size:</strong></p> 
    <form> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-size" value="tiny" id="tiny" /> Tiny</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-size" value="small" id="small" /> Small</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-size" value="medium" id="medium" /> Medium</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-size" value="large" id="large" /> Large</label> 
    <br> 
    <label style="font-size:12px;"> 
     <input type="checkbox" name="fl-size" value="giant" id="giant" /> Giant</label> 
    </form> 

</div> 

<div class="continents-wrap"> 

    <h3 style="font-size:14px; font-weight:normal;">Available Continents</h3> 

    <div class="continents" style="font-size:12px;"> 
    <div>Africa 
     <input type="checkbox" name="fl-cont" value="africa" id="africa" /> 
    </div> 
    <div>Europe 
     <input type="checkbox" name="fl-cont" value="europe" id="europe" /> 
    </div> 
    <div>Asia 
     <input type="checkbox" name="fl-cont" value="asia" id="asia" /> 
    </div> 
    <div>North America 
     <input type="checkbox" name="fl-cont" value="north-america" id="north-america" /> 
    </div> 
    <div>South America 
     <input type="checkbox" name="fl-cont" value="south-america" id="south-america" /> 
    </div> 
    <div>Antarctica 
     <input type="checkbox" name="fl-cont" value="antarctica" id="antarctica" /> 
    </div> 
    <div>Australasia 
     <input type="checkbox" name="fl-cont" value="australasia" id="australasia" /> 
    </div> 
    </div> 

</div> 

<div class="flowers"> 
    <div class="flower" data-id="aloe" data-category="green small medium africa">Aloe</div> 
    <div class="flower" data-id="lavendar" data-category="purple green medium africa europe">Lavender</div> 
    <div class="flower" data-id="stinging-nettle" data-category="green large africa europe asia">Stinging Nettle</div> 
    <div class="flower" data-id="gorse" data-category="green yellow large europe">Gorse</div> 
    <div class="flower" data-id="hemp" data-category="green large asia">Hemp</div> 
    <div class="flower" data-id="titan-arum" data-category="purple other giant asia">Titan Arum</div> 
    <div class="flower" data-id="golden-wattle" data-category="green yellow large australasia">Golden Wattle</div> 
    <div class="flower" data-id="purple-prairie-clover" data-category="purple green other medium north-america">Purple Prairie Clover</div> 
    <div class="flower" data-id="camellia" data-category="pink other large north-america">Camellia</div> 
    <div class="flower" data-id="scarlet-carnation" data-category="red medium north-america">Scarlet Carnation</div> 
    <div class="flower" data-id="indian-paintbrush" data-category="red medium north-america">Indian Paintbrush</div> 
    <div class="flower" data-id="moss-verbena" data-category="purple other small south-america">Moss Verbena</div> 
    <div class="flower" data-id="climbing-dayflower" data-category="blue tiny south-america">Climbing Dayflower</div> 
    <div class="flower" data-id="antarctic-pearlwort" data-category="green yellow large antarctica">Antarctic Pearlwort</div> 
</div> 

CSS

body { 
    font-family: 'Arial'; 
    color: #646464; 
} 

.continents-wrap { 
    float: left; 
    width: 20%; 
    margin: 0 5% 0 0; 
    padding: 0; 
} 

.flowers-wrap { 
    float: left; 
    width: 20%; 
    margin: 0 5% 0 0; 
    padding: 0; 
    position: relative; 
} 

.flowers { 
    float: left; 
    width: 50%; 
} 

.flowers div { 
    float: left; 
    width: 90%; 
    height: 68px; 
    line-height: 68px; 
    padding: 0 5%; 
    background: #eee; 
    margin: 0 0 1px; 
    position: relative; 
} 

JS

var $filterCheckboxes = $('input[type="checkbox"]'); 

    $filterCheckboxes.on('change', function() { 

    var selectedFilters = {}; 

    $filterCheckboxes.filter(':checked').each(function() { 

    if (!selectedFilters.hasOwnProperty(this.name)) { 
     selectedFilters[this.name] = []; 
    } 

    selectedFilters[this.name].push(this.value); 

    }); 

    // create a collection containing all of the filterable elements 
    var $filteredResults = $('.flower'); 

    // loop over the selected filter name -> (array) values pairs 
    $.each(selectedFilters, function(name, filterValues) { 

    // filter each .flower element 
    $filteredResults = $filteredResults.filter(function() { 

     var matched = false, 
     currentFilterValues = $(this).data('category').split(' '); 

     // loop over each category value in the current .flower's data-category 
     $.each(currentFilterValues, function(_, currentFilterValue) { 

     // if the current category exists in the selected filters array 
     // set matched to true, and stop looping. as we're ORing in each 
     // set of filters, we only need to match once 

     if ($.inArray(currentFilterValue, filterValues) != -1) { 
      matched = true; 
      return false; 
     } 
     }); 

     // if matched is true the current .flower element is returned 
     return matched; 

    }); 
    }); 

    $('.flower').hide().filter($filteredResults).show(); 

}); 

Answer 1

您可以检查从jQuery选择结果的长度属性。由于jQuery选择器找到一组元素，所以可以检查jQuery对象的length属性。

if ($filteredResults.length == 0) { 
    $("#divID").show(); 
} else { 
    $("#divID").hide(); 
}