c# - Hide/Display 'Clear' Button when Filter has been used -

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i have problem in hiding clear button until filter options have been selected.

i have 4 asp:dropdownlist's , 'apply filter' button. when option selected user has click 'apply filter' button.

beside 'apply' button, have 'clear/reset' button when click it, reset asp:dropdownlist's defaults.

what want display 'clear/reset' button when of asp:dropdownlist's not equal default. please bar in mind user use filter 2 & 3 , leave filter's 1 & 4 default's code have take in mind.

i want best way have been on google , cant find answer need.

my default.aspx:

 <dl class="filterlist" style="margin-top: -5px">       <dt>           <asp:label id="environment" runat="server" text="environment" associatedcontrolid="environmentdd" />       </dt>       <dd>           <asp:dropdownlist id="environmentdd" runat="server" tooltip="filter table below environment." width="135px" />       </dd>       <dt>           <asp:label id="product" runat="server" text="product" associatedcontrolid="productdd" />       </dt>       <dd>           <asp:dropdownlist id="productdd" runat="server" tooltip="filter table below product." width="135px" />       </dd>       <dt>           <asp:label id="testtype" runat="server" text="test type" associatedcontrolid="testtypedd" />       </dt>       <dd>           <asp:dropdownlist id="testtypedd" runat="server" tooltip="filter table below test type." width="135px" />       </dd>       <dt>           <asp:label id="producttype" runat="server" text="product type" associatedcontrolid="producttypedd" />       </dt>       <dd>           <asp:dropdownlist id="producttypedd" runat="server" tooltip="filter table below product type." width="135px" />       </dd>  </dl>   <div class="button">       <asp:button cssclass="butstyle" id="applyfilter" runat="server" onclick="applyfilters_click" text="apply filter(s)" />&nbsp;       <asp:button cssclass="butstyle" id="clearfilters" runat="server" onclick="clearfilters_click" text="clear filter(s)"                     tooltip="click button reset filters set." />  </div>

the asp:dropdownlist's populated in code behind generate asp:datagrid table sql.

add common cssclass drop-downs , hook event on change of these drop-down.

for example, have used mydropdown class , considering default value 1.

jquery(function ($) {     $(".mydropdown").on("change", function () {         var totaldropdown = $(".mydropdown").length;         var unchangeddropdown = $(".mydropdown").filter(function () {             return $(this).find("option:selected").val() == 1;         }).length;          console.log(unchangeddropdown);         if (totaldropdown === unchangeddropdown) {             $(".butstyle").hide();         } else {             $(".butstyle").show();         }      }); });

simulation


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