title: Jquery validation to require at least one field is selected for a filter?
body: <p>Can someone give me a Jquery example to enforce at least one field is selected.
  My issue how do I check for items like checkbox and dropdownlists (default empty string)?
  Note: using ASP.NET MVC3 C#</p>
  
  <p>my code in the view:</p>
  
  <pre><code> &lt;fieldset  id="fieldset1" class="coolfieldset"&gt;
          &lt;legend&gt;Search/Contacts&lt;/legend&gt;
          &lt;div class="div-table"&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;Reg Date:&lt;/div&gt;
              &lt;div class="div-table-col"&gt;&lt;input id="regDateFrom" class="datepicker" name="regDateFrom" value="@regDateFrom" type="text" /&gt; to &lt;input id="regDateEnd" class="datepicker" value="@regDateEnd" name="regDateEnd" type="text" /&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;Profile Mod Date:&lt;/div&gt;
              &lt;div class="div-table-col"&gt;&lt;input type="text" id="profileModDateFrom" class="datepicker" value="@profileModDateFrom"  name="profileModDateFrom" /&gt; to &lt;input id="profileModDateEnd" class="datepicker" value="@profileModDateEnd" name="profileModDateEnd" type="text" /&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;Last Name:&lt;/div&gt;
              &lt;div class="div-table-col"&gt;&lt;input type="text" class="required_group"  id="lastName" name="lastName" value="@lastName" /&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt; First Name:&lt;/div&gt;
              &lt;div class="div-table-col"&gt;&lt;input type="text" class="required_group"  id="firstName" name="firstName" value="@firstName"  /&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt; Company:&lt;/div&gt;
              &lt;div class="div-table-col"&gt; &lt;input type="text" class="required_group"  id="companyname" name="companyname" value="@companyname" /&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;Publication:&lt;/div&gt;
              &lt;div class="div-table-col"&gt; 
              @Html.DropDownList(
              "publication", 
                  new SelectList(
                      ViewData["pubs"] as System.Collections.IEnumerable,
                      "PublicationID",
                      "PublicationFullName",
                      publication
                  ),""
              )
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt; Country:&lt;/div&gt;
              &lt;div class="div-table-col"&gt; 
               @Html.DropDownList(
              "country", 
                  new SelectList(
                 ViewData["countries"] as System.Collections.IEnumerable,
                     "Country",
                     "Country",
                      country
                  ),""
              )
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;Client Only:&lt;/div&gt;
              &lt;div class="div-table-col"&gt; &lt;input type="checkbox" id="cisonly" name="cisonly" value="1" @bChecked /&gt;
          &lt;/div&gt;
            &lt;div class="div-table-row"&gt;
              &lt;div class="div-table-col"&gt;&lt;input id="search" name="search" type="submit" value="Search" /&gt;&lt;/div&gt;
              &lt;div class="div-table-col"&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;/div&gt;      
      &lt;/fieldset&gt;
  </code></pre>