javascript - dropdown with form fields bootstrap 3 -

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i'm trying build dropdown functions in image below (or go kayak's website):

dropdown incrementing/decrementing fields

i need dropdown field within dropdown field, , need couple of fields allow incrementing/decrementing.

i couldn't dropdown within dropdown work right. tried variations of following:

i've tried variations of:

<div class="dropdown">   <button class="btn btn-default dropdown-toggle" type="button" id="dropdownmenu" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">     dropdown     <span class="caret"></span>   </button>   <form>     <div class="dropdown form-group clearfix">                   <button class="btn btn-dropdown dropdown-toggle" type="button" id="menu1" data-toggle="dropdown">fare class                   <span class="caret"></span></button>                     <ul class="dropdown-menu" role="menu" aria-labelledby="menu1">                       <li role="presentation" class="mas10px"><a role="menuitem" href="#">economy</a></li>                       <li role="presentation" class="mas10px"><a role="menuitem" href="#">business</a></li>                       <li role="presentation" class="mas10px"><a role="menuitem" href="#">first</a></li>                     </ul>                 </div>   </form> </div>

i didn't know begin increment parts of each text field.

any thoughts on how this?

update: can't keep main dropdown open able click on dropdown or increment/decrement field within main dropdown. main dropdown closes on me. below latest code:

<div class="dropdown">   <button class="btn btn-primary dropdown-toggle" id="menu1" type="button" data-toggle="dropdown">dropdown example     <span class="caret"></span></button>     <ul class="dropdown-menu" role="menu" aria-labelledby="menu1">       <li>         <div class="dropdown form-group clearfix">           <button class="btn btn-dropdown dropdown-toggle" type="button" id="menu1" data-toggle="dropdown">fare class           <span class="caret"></span></button>             <ul class="dropdown-menu" role="menu" aria-labelledby="menu1">               <li role="presentation" class="mas10px"><a role="menuitem" href="#">economy</a></li>               <li role="presentation" class="mas10px"><a role="menuitem" href="#">business</a></li>               <li role="presentation" class="mas10px"><a role="menuitem" href="#">first</a></li>             </ul>           </div>           <div class="container">             <h2>bootstrap counter field</h2>               <div class="row">                 <div class="col-sm-3">                   <div class="input-group">                     <span class="input-group-btn">                   <button type="button" class="btn btn-default btn-number" disabled="disabled" data-type="minus" data-field="quant[1]">                       <span class="glyphicon glyphicon-minus"></span>                     </button>                     </span>                     <input type="text" name="quant[1]" class="form-control input-number" value="1" min="1" max="10">                     <span class="input-group-btn">                   <button type="button" class="btn btn-default btn-number" data-type="plus" data-field="quant[1]">                       <span class="glyphicon glyphicon-plus"></span>                     </button>                     </span>                   </div>               </div>             </div>           </div>         </li>       </ul> </div>


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