bootstrap form elements not aligning properly - html

Question

I am trying to align form input elements using bootstrap and not having much luck. I have tried using pull-left. Is there any way to do this using pure bootstrap, without having to add crufty one-off css?
<div class="modal-body">
<form class="form-horizontal" role="form">
<div class="row">
<div class="form-group">
<label class="control-label col-xs-2">Title:</label>
<div class="col-xs-10">
<input type="text" class="form-control" data-bind="value: title" />
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<label class="control-label col-xs-2">Start:</label>
<div class="input-group input-group-sm col-xs-3">
<input type="text" placeholder="mm/dd/yy" data-provide="datepicker" data-bind="value:date" id="Date" />
<span class="input-group-addon"><i class="fa fa-calendar"></i></span>
</div>
</div>
</div>
</form>
</div>

Answer 1

As stated, your structure isn't using the correct components together. You should not mix column classes with input-groups (docs) nor should you use rows within a horizontal form class. See the Docs
Use Bootstrap's predefined grid classes to align labels and groups of
form controls in a horizontal layout by adding .form-horizontal to the
form (which doesn't have to be a ). Doing so changes
.form-groups to behave as grid rows, so no need for .row.
Working example Snippet.
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Open Modal</button>
<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4>Some Form</h4>
</div>
<div class="modal-body">
<form class="form-horizontal">
<div class="form-group">
<label class="control-label col-xs-3">Title:</label>
<div class="col-xs-9">
<input type="text" class="form-control" data-bind="value: title" />
</div>
</div>
<div class="form-group">
<label class="control-label col-xs-3">Start:</label>
<div class="col-xs-9">
<div class="input-group">
<input type="text" class="form-control" placeholder="mm/dd/yy" data-provide="datepicker" data-bind="value:date" id="Date" /> <span class="input-group-addon"><i class="fa fa-calendar"></i></span>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
</div>

Answer 2

First off you're missing class="form-control" on your second form group.
Second you're mixing columns with input groups, that's not the bootstrap way.
Don't mix input-group with other components.
(see:http://getbootstrap.com/components/#input-groups)
Do not mix form groups or grid column classes directly with input
groups. Instead, nest the input group inside of the form group or
grid-related element."
Proper HTML Structure:
<div class="modal-body">
<form class="form-horizontal" role="form">
<div class="row">
<div class="form-group">
<label class="control-label col-xs-2">Title:</label>
<div class="col-xs-10">
<input type="text" class="form-control" data-bind="value: title" />
</div>
</div>
</div>
<div class="row">
<div class="form-group">
<label class="control-label col-xs-2">Start:</label>
<div class="col-xs-4">
<div class="input-group">
<input type="text" class="form-control" data-bind="value: title" />
<span class="input-group-addon"><i class="fa fa-calendar"></i></span>
</div>
</div>
</div>
</div>
</form>
</div>
Fixed Demo CODEPEN