"Multiple fields"
Bootstrap 3.1.0 Snippet by maxslayer44

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<div class="col-xs-4">
<form>
<div class="form-group">
<label>Multiple fields</label>
<div class="form-group input-group">
<input type="text" name="multiple[]" class="form-control">
<span class="input-group-btn"><button type="button" class="btn btn-default btn-add">+</button></span>
</div>
</div>
</form>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-xs-12">
<form>
<div class="form-group">
<label>Multiple fields</label>
<div class="form-group input-group">
<input type="text" name="multiple[]" class="form-control">
<span class="input-group-btn"><button type="button" class="btn btn-default btn-add">+</button></span>
</div>
</div>
</form>
</div>
</div>
</div>
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$( document ).on( 'click', '.btn-add', function ( event ) {
event.preventDefault();
var field = $(this).closest( '.form-group' );
var field_new = field.clone();
$(this)
.toggleClass( 'btn-default' )
.toggleClass( 'btn-add' )
.toggleClass( 'btn-danger' )
.toggleClass( 'btn-remove' )
.html( '–' );
field_new.find( 'input' ).val( '' );
field_new.insertAfter( field );
} );
$( document ).on( 'click', '.btn-remove', function ( event ) {
event.preventDefault();
$(this).closest( '.form-group' ).remove();
} );
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