Twitter-Bootstrap: Two dropdown-toggle buttons side by side not working properly

You forgot your .dropdown wrapper.

Update 2 : forgot some code for groups. And made a gist (github)

Update : made a better wrapping, and styling like buttons. This is basically another button-type styling, but without the baggage of the .btn class.

<div class="btn-group">
    <div class="dropdown dropdown-btn">
        <div class="dropdown-toggle" data-toggle="dropdown">
            <span id="uniqueId">Text1</span><span class="caret"/>
        </div >
        <ul class="dropdown-menu">
            <li><a onclick="javascript:someFunction()">Item1</a></li>
            <li><a onclick="javascript:someFunction()">Item2</a></li>
            <!-- ... -->
        </ul>
    </div>
    <div class="dropdown dropdown-btn">
        <div class="dropdown-toggle" data-toggle="dropdown">
            <span id="uniqueId2">Text2</span><span class="caret"/>
        </div >
        <ul class="dropdown-menu">
            <li><a onclick="javascript:someOtherFunction()">Item1</a></li>
            <li><a onclick="javascript:someOtherFunction()">Item2</a></li>
            <!-- ... -->
        </ul>
    </div>
</div>

with a big css adjustement (buttons.less and button-groups.less reused changing .btn to .dropdown-btn from here (github)):

.dropdown-btn {
    display: inline-block;
    *display: inline;
    /* IE7 inline-block hack */
    *zoom: 1;
    padding: 4px 10px 4px;
    margin-bottom: 0;
    font-size: 13px;
    line-height: 18px;
    *line-height: 20px;
    color: #333333;
    text-align: center;
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
    vertical-align: middle;
    cursor: pointer;
    background-color: #f5f5f5;
    background-image: -moz-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -ms-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#ffffff), to(#e6e6e6));
    background-image: -webkit-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: -o-linear-gradient(top, #ffffff, #e6e6e6);
    background-image: linear-gradient(top, #ffffff, #e6e6e6);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#e6e6e6', GradientType=0);
    border-color: #e6e6e6 #e6e6e6 #bfbfbf;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #e6e6e6;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
    border: 1px solid #cccccc;
    *border: 0;
    border-bottom-color: #b3b3b3;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    *margin-left: .3em;
    -webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
}
.dropdown-btn:hover,
.dropdown-btn:active,
.dropdown-btn.active,
.dropdown-btn.disabled,
.dropdown-btn[disabled] {
    background-color: #e6e6e6;
    *background-color: #d9d9d9;
}
.dropdown-btn:active,
.dropdown-btn.active { background-color: #cccccc \9 }
.dropdown-btn:first-child { *margin-left: 0 }
.dropdown-btn:hover {
    color: #333333;
    text-decoration: none;
    background-color: #e6e6e6;
    *background-color: #d9d9d9;
    /* Buttons in IE7 don't get borders, so darken on hover */
    background-position: 0 -15px;
    -webkit-transition: background-position 0.1s linear;
    -moz-transition: background-position 0.1s linear;
    -ms-transition: background-position 0.1s linear;
    -o-transition: background-position 0.1s linear;
    transition: background-position 0.1s linear;
}
.dropdown-btn:focus {
    outline: thin dotted #333;
    outline: 5px auto -webkit-focus-ring-color;
    outline-offset: -2px;
}
.dropdown-btn.active,
.dropdown-btn:active {
    background-color: #e6e6e6;
    background-color: #d9d9d9 \9;
    background-image: none;
    outline: 0;
    -webkit-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
}
.dropdown-btn.disabled,
.dropdown-btn[disabled] {
    cursor: default;
    background-color: #e6e6e6;
    background-image: none;
    opacity: 0.65;
    filter: alpha(opacity=65);
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
}
.dropdown-btn-large {
    padding: 9px 14px;
    font-size: 15px;
    line-height: normal;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
}
.dropdown-btn-large [class^="icon-"] { margin-top: 1px }
.dropdown-btn-small {
    padding: 5px 9px;
    font-size: 11px;
    line-height: 16px;
}
.dropdown-btn-small [class^="icon-"] { margin-top: -1px }
.dropdown-btn-mini {
    padding: 2px 6px;
    font-size: 11px;
    line-height: 14px;
}
.dropdown-btn-primary,
.dropdown-btn-primary:hover,
.dropdown-btn-warning,
.dropdown-btn-warning:hover,
.dropdown-btn-danger,
.dropdown-btn-danger:hover,
.dropdown-btn-success,
.dropdown-btn-success:hover,
.dropdown-btn-info,
.dropdown-btn-info:hover,
.dropdown-btn-inverse,
.dropdown-btn-inverse:hover {
    color: #ffffff;
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
}
.dropdown-btn-primary.active,
.dropdown-btn-warning.active,
.dropdown-btn-danger.active,
.dropdown-btn-success.active,
.dropdown-btn-info.active,
.dropdown-btn-inverse.active { color: rgba(255, 255, 255, 0.75) }
.dropdown-btn {
    border-color: #ccc;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
}
.dropdown-btn-primary {
    background-color: #0074cc;
    background-image: -moz-linear-gradient(top, #0088cc, #0055cc);
    background-image: -ms-linear-gradient(top, #0088cc, #0055cc);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#0088cc), to(#0055cc));
    background-image: -webkit-linear-gradient(top, #0088cc, #0055cc);
    background-image: -o-linear-gradient(top, #0088cc, #0055cc);
    background-image: linear-gradient(top, #0088cc, #0055cc);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#0088cc', endColorstr='#0055cc', GradientType=0);
    border-color: #0055cc #0055cc #003580;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #0055cc;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-primary:hover,
.dropdown-btn-primary:active,
.dropdown-btn-primary.active,
.dropdown-btn-primary.disabled,
.dropdown-btn-primary[disabled] {
    background-color: #0055cc;
    *background-color: #004ab3;
}
.dropdown-btn-primary:active,
.dropdown-btn-primary.active { background-color: #004099 \9 }
.dropdown-btn-warning {
    background-color: #faa732;
    background-image: -moz-linear-gradient(top, #fbb450, #f89406);
    background-image: -ms-linear-gradient(top, #fbb450, #f89406);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#fbb450), to(#f89406));
    background-image: -webkit-linear-gradient(top, #fbb450, #f89406);
    background-image: -o-linear-gradient(top, #fbb450, #f89406);
    background-image: linear-gradient(top, #fbb450, #f89406);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fbb450', endColorstr='#f89406', GradientType=0);
    border-color: #f89406 #f89406 #ad6704;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #f89406;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-warning:hover,
.dropdown-btn-warning:active,
.dropdown-btn-warning.active,
.dropdown-btn-warning.disabled,
.dropdown-btn-warning[disabled] {
    background-color: #f89406;
    *background-color: #df8505;
}
.dropdown-btn-warning:active,
.dropdown-btn-warning.active { background-color: #c67605 \9 }
.dropdown-btn-danger {
    background-color: #da4f49;
    background-image: -moz-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -ms-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#ee5f5b), to(#bd362f));
    background-image: -webkit-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: -o-linear-gradient(top, #ee5f5b, #bd362f);
    background-image: linear-gradient(top, #ee5f5b, #bd362f);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ee5f5b', endColorstr='#bd362f', GradientType=0);
    border-color: #bd362f #bd362f #802420;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #bd362f;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-danger:hover,
.dropdown-btn-danger:active,
.dropdown-btn-danger.active,
.dropdown-btn-danger.disabled,
.dropdown-btn-danger[disabled] {
    background-color: #bd362f;
    *background-color: #a9302a;
}
.dropdown-btn-danger:active,
.dropdown-btn-danger.active { background-color: #942a25 \9 }
.dropdown-btn-success {
    background-color: #5bb75b;
    background-image: -moz-linear-gradient(top, #62c462, #51a351);
    background-image: -ms-linear-gradient(top, #62c462, #51a351);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#62c462), to(#51a351));
    background-image: -webkit-linear-gradient(top, #62c462, #51a351);
    background-image: -o-linear-gradient(top, #62c462, #51a351);
    background-image: linear-gradient(top, #62c462, #51a351);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#62c462', endColorstr='#51a351', GradientType=0);
    border-color: #51a351 #51a351 #387038;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #51a351;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-success:hover,
.dropdown-btn-success:active,
.dropdown-btn-success.active,
.dropdown-btn-success.disabled,
.dropdown-btn-success[disabled] {
    background-color: #51a351;
    *background-color: #499249;
}
.dropdown-btn-success:active,
.dropdown-btn-success.active { background-color: #408140 \9 }
.dropdown-btn-info {
    background-color: #49afcd;
    background-image: -moz-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -ms-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#5bc0de), to(#2f96b4));
    background-image: -webkit-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: -o-linear-gradient(top, #5bc0de, #2f96b4);
    background-image: linear-gradient(top, #5bc0de, #2f96b4);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#5bc0de', endColorstr='#2f96b4', GradientType=0);
    border-color: #2f96b4 #2f96b4 #1f6377;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #2f96b4;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-info:hover,
.dropdown-btn-info:active,
.dropdown-btn-info.active,
.dropdown-btn-info.disabled,
.dropdown-btn-info[disabled] {
    background-color: #2f96b4;
    *background-color: #2a85a0;
}
.dropdown-btn-info:active,
.dropdown-btn-info.active { background-color: #24748c \9 }
.dropdown-btn-inverse {
    background-color: #414141;
    background-image: -moz-linear-gradient(top, #555555, #222222);
    background-image: -ms-linear-gradient(top, #555555, #222222);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#555555), to(#222222));
    background-image: -webkit-linear-gradient(top, #555555, #222222);
    background-image: -o-linear-gradient(top, #555555, #222222);
    background-image: linear-gradient(top, #555555, #222222);
    background-repeat: repeat-x;
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#555555', endColorstr='#222222', GradientType=0);
    border-color: #222222 #222222 #000000;
    border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25);
    *background-color: #222222;
    /* Darken IE7 buttons by default so they stand out more given they won't have borders */
    filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}
.dropdown-btn-inverse:hover,
.dropdown-btn-inverse:active,
.dropdown-btn-inverse.active,
.dropdown-btn-inverse.disabled,
.dropdown-btn-inverse[disabled] {
    background-color: #222222;
    *background-color: #151515;
}
.dropdown-btn-inverse:active,
.dropdown-btn-inverse.active { background-color: #080808 \9 }
button.dropdown-btn,
input[type="submit"].dropdown-btn {
    *padding-top: 2px;
    *padding-bottom: 2px;
}
button.dropdown-btn::-moz-focus-inner,
input[type="submit"].dropdown-btn::-moz-focus-inner {
    padding: 0;
    border: 0;
}
button.dropdown-btn.dropdown-btn-large,
input[type="submit"].dropdown-btn.dropdown-btn-large {
    *padding-top: 7px;
    *padding-bottom: 7px;
}
button.dropdown-btn.dropdown-btn-small,
input[type="submit"].dropdown-btn.dropdown-btn-small {
    *padding-top: 3px;
    *padding-bottom: 3px;
}
button.dropdown-btn.dropdown-btn-mini,
input[type="submit"].dropdown-btn.dropdown-btn-mini {
    *padding-top: 1px;
    *padding-bottom: 1px;
}
.btn-group {
    position: relative;
    *zoom: 1;
    *margin-left: .3em;
}
.btn-group:before,
.btn-group:after {
    display: table;
    content: "";
}
.btn-group:after { clear: both }
.btn-group:first-child { *margin-left: 0 }
.btn-group + .btn-group { margin-left: 5px }
.dropdown-btn-toolbar {
    margin-top: 9px;
    margin-bottom: 9px;
}
.dropdown-btn-toolbar .btn-group {
    display: inline-block;
    *display: inline;
    /* IE7 inline-block hack */
    *zoom: 1;
}
.btn-group > .dropdown-btn {
    position: relative;
    float: left;
    margin-left: -1px;
    -webkit-border-radius: 0;
    -moz-border-radius: 0;
    border-radius: 0;
}
.btn-group > .dropdown-btn:first-child {
    margin-left: 0;
    -webkit-border-top-left-radius: 4px;
    -moz-border-radius-topleft: 4px;
    border-top-left-radius: 4px;
    -webkit-border-bottom-left-radius: 4px;
    -moz-border-radius-bottomleft: 4px;
    border-bottom-left-radius: 4px;
}
.btn-group > .dropdown-btn:last-child,
.btn-group > .dropdown-toggle {
    -webkit-border-top-right-radius: 4px;
    -moz-border-radius-topright: 4px;
    border-top-right-radius: 4px;
    -webkit-border-bottom-right-radius: 4px;
    -moz-border-radius-bottomright: 4px;
    border-bottom-right-radius: 4px;
}
.btn-group > .dropdown-btn.large:first-child {
    margin-left: 0;
    -webkit-border-top-left-radius: 6px;
    -moz-border-radius-topleft: 6px;
    border-top-left-radius: 6px;
    -webkit-border-bottom-left-radius: 6px;
    -moz-border-radius-bottomleft: 6px;
    border-bottom-left-radius: 6px;
}
.btn-group > .dropdown-btn.large:last-child,
.btn-group > .large.dropdown-toggle {
    -webkit-border-top-right-radius: 6px;
    -moz-border-radius-topright: 6px;
    border-top-right-radius: 6px;
    -webkit-border-bottom-right-radius: 6px;
    -moz-border-radius-bottomright: 6px;
    border-bottom-right-radius: 6px;
}
.btn-group > .dropdown-btn:hover,
.btn-group > .dropdown-btn:focus,
.btn-group > .dropdown-btn:active,
.btn-group > .dropdown-btn.active { z-index: 2 }
.btn-group .dropdown-toggle:active,
.btn-group.open .dropdown-toggle { outline: 0 }
.btn-group > .dropdown-toggle {
    padding-left: 8px;
    padding-right: 8px;
    -webkit-box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
    *padding-top: 4px;
    *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-mini.dropdown-toggle {
    padding-left: 5px;
    padding-right: 5px;
}
.btn-group > .dropdown-btn-small.dropdown-toggle {
    *padding-top: 4px;
    *padding-bottom: 4px;
}
.btn-group > .dropdown-btn-large.dropdown-toggle {
    padding-left: 12px;
    padding-right: 12px;
}
.btn-group.open .dropdown-toggle {
    background-image: none;
    -webkit-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    -moz-box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
    box-shadow: inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
}
.btn-group.open .dropdown-btn.dropdown-toggle { background-color: #e6e6e6 }
.btn-group.open .dropdown-btn-primary.dropdown-toggle { background-color: #0055cc }
.btn-group.open .dropdown-btn-warning.dropdown-toggle { background-color: #f89406 }
.btn-group.open .dropdown-btn-danger.dropdown-toggle { background-color: #bd362f }
.btn-group.open .dropdown-btn-success.dropdown-toggle { background-color: #51a351 }
.btn-group.open .dropdown-btn-info.dropdown-toggle { background-color: #2f96b4 }
.btn-group.open .dropdown-btn-inverse.dropdown-toggle { background-color: #222222 }
.dropdown-btn .caret {
    margin-top: 7px;
    margin-left: 0;
}
.dropdown-btn:hover .caret,
.open.btn-group .caret {
    opacity: 1;
    filter: alpha(opacity=100);
}
.dropdown-btn-mini .caret { margin-top: 5px }
.dropdown-btn-small .caret { margin-top: 6px }
.dropdown-btn-large .caret {
    margin-top: 6px;
    border-left-width: 5px;
    border-right-width: 5px;
    border-top-width: 5px;
}
.dropup .dropdown-btn-large .caret {
    border-bottom: 5px solid #000000;
    border-top: 0;
}
.dropdown-btn-primary .caret,
.dropdown-btn-warning .caret,
.dropdown-btn-danger .caret,
.dropdown-btn-info .caret,
.dropdown-btn-success .caret,
.dropdown-btn-inverse .caret {
    border-top-color: #ffffff;
    border-bottom-color: #ffffff;
    opacity: 0.75;
    filter: alpha(opacity=75);
}

Live demo (jsfiddle)

Live demo (jsfiddle) updated

Live demo(jsfiddle) updated 2

PS: don't try version 3 nor 4...

Or you could just add a CSS class to the btn-group divs and do this instead:

http://jsfiddle.net/plankmeister/JsPcg/

HTML:

    <div class="navbar navbar-fixed-top">
        <div class="navbar-inner">
            <div class="container">
                <div class="pull-left">
                    <div class="btn-group btn-group-merge">
                        <a class="btn" href="#" data-toggle="dropdown"><i class="icon icon-certificate"></i></a>
                        <ul class="dropdown-menu">
                             <li><a href="#">One</a></li>
                             <li><a href="#">Two</a></li>
                             <li><a href="#">Three</a></li>
                        </ul>                            
                    </div>
                    <div class="btn-group btn-group-merge">
                        <a class="btn" href="#" data-toggle="dropdown"><i class="icon icon-comment"></i></a>
                        <ul class="dropdown-menu">
                             <li><a href="#">A B C</a></li>
                             <li><a href="#">D E F</a></li>
                             <li><a href="#">G H I</a></li>
                        </ul>                            
                    </div>                        
                </div>
            </div>
        </div>
    </div> 

CSS:

    .navbar-fixed-top .btn-group-merge {
        margin-left : -5px;
    }
    .navbar-fixed-top .btn-group-merge:first-child {
        margin-left : 0;
    }
    .navbar-fixed-top .btn-group-merge .btn {
        border-radius: 0 4px 4px 0;
    }
    .navbar-fixed-top .btn-group-merge:first-child .btn {
        border-radius: 4px 0 0 4px;
    }

This will work with any number of buttons in the button group, but only the first and last will be rendered correctly. You could use some CSS-fu to fix it, but it wouldn't render on IE<10.