Bootstrap 3:如何在一行上获得两个表单输入,在各行上获得其他输入？

Question

我尝试使用Bootstrap 3.1.1格式化我的注册页面.我希望前两个输入在同一行,而其他输入是一个有自己的行.我玩过引导类"row","form-inline"和"form-horizo​​ntal"都无济于事.

有谁知道怎么做？

这是小提琴

<style>
.reg_name {
 max-width:200px;
}
</style>


<form name="registration_form" id='registration_form' class="form-inline">

        <div class="form-group">
            <label for="firstname" class="sr-only"></label>
            <input id="firstname" class="form-control input-group-lg reg_name" type="text" name="firstname"
                   title="Enter first name"
                   placeholder="First name"/>
        </div>

        <div class="form-group">
            <label for="lastname" class="sr-only"></label>
            <input id="lastname" class="form-control input-group-lg reg_name" type="text" name="lastname"
                   title="Enter last name"
                   placeholder="Last name"/>
        </div>

    <div class="form-group">
        <label for="username" class="sr-only"></label>
        <input id="username" class="form-control input-group-lg" type="text" autocapitalize='off' name="username"
               title="Enter username"
               placeholder="Username"/>
    </div>

    <div class="form-group">
        <label for="password" class="sr-only"></label>
        <input id="password" class="form-control input-group-lg" type="password" name="password"
               title="Enter password"
               placeholder="Password"/>
    </div>

 </form>

Answer 1

使用<div class="row">和<div class="form-group col-xs-6">

这里有一个小提琴:https://jsfiddle.net/core972/SMkZV/2/

Answer 2

您可以将输入包装在col-*类中

<form name="registration_form" id="registration_form" class="form-horizontal">
     <div class="form-group">
           <div class="col-sm-6">
             <label for="firstname" class="sr-only"></label>
             <input id="firstname" class="form-control input-group-lg reg_name" type="text" name="firstname" title="Enter first name" placeholder="First name">
           </div>       
           <div class="col-sm-6">
             <label for="lastname" class="sr-only"></label>
             <input id="lastname" class="form-control input-group-lg reg_name" type="text" name="lastname" title="Enter last name" placeholder="Last name">
           </div>
    </div><!--/form-group-->

    <div class="form-group">
        <div class="col-sm-12">
          <label for="username" class="sr-only"></label>
          <input id="username" class="form-control input-group-lg" type="text" autocapitalize="off" name="username" title="Enter username" placeholder="Username">
        </div>
    </div><!--/form-group-->

    <div class="form-group">
        <div class="col-sm-12">
        <label for="password" class="sr-only"></label>
        <input id="password" class="form-control input-group-lg" type="password" name="password" title="Enter password" placeholder="Password">
        </div>
    </div><!--/form-group-->
 </form>

http://bootply.com/127825

Answer 3

您可以在一个div内部编写两个输入框

<div class="input-group">
            <span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
            <input style="width:50% " class="form-control " placeholder="first name"  name="firstname" type="text" />
            <input style="width:50% " class="form-control " placeholder="lastname"  name="lastname" type="text" />
        </div>