将星号添加到bootstrap 3中的必填字段？

Question

我的HTML有一个被调用的类.required,它被分配给必需的字段.这是html:

<form action="/accounts/register/" method="post" role="form" class="form-horizontal">
    <input type='hidden' name='csrfmiddlewaretoken' value='brGfMU16YyyG2QEcpLqhb3Zh8AvkYkJt' />
    <div class="form-group required">
       <label class="col-md-2 control-label">Username</label>
       <div class="col-md-4">
         <input class="form-control" id="id_username" maxlength="30" name="username" placeholder="Username" required="required" title="" type="text" />
       </div>
    </div>
    <div class="form-group required"><label class="col-md-2 control-label">E-mail</label><div class="col-md-4"><input class="form-control" id="id_email" name="email" placeholder="E-mail" required="required" title="" type="email" /></div></div>
    <div class="form-group required"><label class="col-md-2 control-label">Password</label><div class="col-md-4"><input class="form-control" id="id_password1" name="password1" placeholder="Password" required="required" title="" type="password" /></div></div>
    <div class="form-group required"><label class="col-md-2 control-label">Password (again)</label><div class="col-md-4"><input class="form-control" id="id_password2" name="password2" placeholder="Password (again)" required="required" title="" type="password" /></div></div>
    <div class="form-group required"><label class="col-md-2 control-label">first name</label><div class="col-md-4"><input class="form-control" id="id_first_name" maxlength="30" name="first_name" placeholder="first name" required="required" title="" type="text" /></div></div>
    <div class="form-group required"><label class="col-md-2 control-label">last name</label><div class="col-md-4"><input class="form-control" id="id_last_name" maxlength="30" name="last_name" placeholder="last name" required="required" title="" type="text" /></div></div>
    <div class="form-group required"><label class="col-md-2 control-label">&#160;</label><div class="col-md-4"><div class="checkbox"><label><input class="" id="id_tos" name="tos" required="required" type="checkbox" /> I have read and agree to the Terms of Service</label></div></div></div>

    <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
           <button type="submit" class="btn btn-primary">
              <span class="glyphicon glyphicon-star"></span> Sign Me Up!
           </button>
        </div>
    </div>
</form>

我把以下内容添加到了我的CSS中;

.form-group .required .control-label:after {
  content:"*";color:red;
}

仍然不会*在必填字段周围产生红色.我在这里想念的是什么？在引导程序3中没有直接引入*必需字段的方法.

编辑:*在条款和条件中没有立即出现在checkbox.how来解决这个问题？

Answer 1

.form-group.required没有空间使用.

.form-group.required .control-label:after {
  content:"*";
  color:red;
}

编辑:

对于复选框,您可以使用伪类:not().您在每个标签后添加所需的*,除非它是一个复选框

.form-group.required:not(.checkbox) .control-label:after, 
.form-group.required .text:after { /* change .text in whatever class of the text after the checkbox has */
   content:"*";
   color:red;
}

注意:未经测试

您应该使用.text类或以其他方式定位它,尝试这个html:

<div class="form-group required">
   <label class="col-md-2 control-label">&#160;</label>
   <div class="col-md-4">
      <div class="checkbox">
         <label class='text'> <!-- use this class -->
            <input class="" id="id_tos" name="tos" required="required" type="checkbox" /> I have read and agree to the Terms of Service
         </label>
      </div>
   </div>
</div>

好的第三次编辑:

CSS回到原来的样子

.form-group.required .control-label:after { 
   content:"*";
   color:red;
}

HTML:

<div class="form-group required">
   <label class="col-md-2">&#160;</label> <!-- remove class control-label -->
   <div class="col-md-4">
      <div class="checkbox">
         <label class='control-label'> <!-- use this class as the red * will be after control-label -->
            <input class="" id="id_tos" name="tos" required="required" type="checkbox" /> I have read and agree to the Terms of Service
         </label>
      </div>
   </div>
</div>

Answer 2

假设这就是HTML的样子

<div class="form-group required">
   <label class="col-md-2 control-label">E-mail</label>
   <div class="col-md-4"><input class="form-control" id="id_email" name="email" placeholder="E-mail" required="required" title="" type="email" /></div>
</div>

要在标签右侧显示星号:

.form-group.required .control-label:after { 
    color: #d00;
    content: "*";
    position: absolute;
    margin-left: 8px;
    top:7px;
}

或者在标签的左侧:

.form-group.required .control-label:before{
   color: red;
   content: "*";
   position: absolute;
   margin-left: -15px;
}

要制作漂亮的大红色星号,您可以添加以下行:

font-family: 'Glyphicons Halflings';
font-weight: normal;
font-size: 14px;

或者,如果您使用Font Awesome添加这些行(并更改内容行):

font-family: 'FontAwesome';
font-weight: normal;
font-size: 14px;
content: "\f069";

Answer 3

.form-group .required .control-label:after应该是.form-group.required .control-label:after.删除.form-group和.required之间的空格是一种变化.

Answer 4

使用简单的CSS，

.myform .required:after {
  content: " *";
    color: red;
    font-weight: 100;
}

 <form class="myform">
    <div class="col-md-12">
      <label for="xxx_fname" class="form-label required">First Name</label>
      <input type="text" class="form-control" id="xxx_fname" >
   </div>
    <div class="col-md-12">
      <label for="xxx_lname" class="form-label required">Last Name</label>
      <input type="text" class="form-control" id="xxx_lname" >
   </div>
</form