更改 CSS 样式 HTML5 表单必填属性必填消息

Question

我为 RTL 项目与 RTLbootstrap 合作。现在我有任何带有 HTML5 表单必需属性必需消息 的表单。在行动中，我有这个气球作为输入：

我需要像这样为 RTL 进行更改：

HTML：

<div class="controls">
  <input class="span4" type="text" name="title" placeholder="Title"  value=""  required oninvalid="this.setCustomValidity(\'User ID is a must\')">
</div>

注意：这不是自定义工具提示或气球！如果我们在表单输入中添加所需的 html 标签。在提交表单HTML5 form required attribute 之前自动显示此气球消息。我需要为验证消息编辑/更改/设置 CSS？

如何更改 right 的 input 字段中显示的必填字段消息的显示？

Answer 1

Chrome 不再允许为表单验证气泡设置样式：

See Details

Firefox 无法设置错误气泡样式

See Details

Answer 2

嘿，我在这里找到了一个链接，他们使用了这个技巧。他们在输入类型上附加了一个类。并在那里显示消息。希望在进行少量定制后有所帮助。 工作代码笔：http://codepen.io/smarty_tech/pen/ONZRVp

<form id="frm" action="action">
<div>
<label>Email</label>
  <input type="email" required="required"/><span class="theTooltip">Invalid email</span>
 </div>
 <div>
  <button formnovalidate="formnovalidate">OK</button>
</div>

 document.querySelector('#frm').addEventListener('submit', e => {
   e.preventDefault();
   e.currentTarget.classList.add('submitted');
 });

  body
  font-family: Helvetica, sans-serif
 display: flex
 flex-direction: column
align-items: center
 justify-content: center
overflow: hidden
width: 100%
 height: 100vh
  background orange

 form > div
  position: relative
  margin-bottom: 10px

 .theTooltip
  $bgcolor = rgba(black, 0.7)
  $arrow = 10
  $radius = 5
  $maxWidth = 250
  $padding = 15
  backface-visibility: hidden
  will-change: opacity, visibility
  max-width: $maxWidth * 1px
  border-radius: $radius * 1px
  background-color: $bgcolor
  padding: $padding * 1px
  color: white
  box-sizing: border-box
  display: inline-block
  position: absolute
  transform-style: preserve-3d
  transform: translate(15%, -50%)
  top: 50%;
  left: auto
  right: auto
  bottom: auto
  visibility: hidden
  margin: 0
  opacity: 0
  transition: opacity 0.3s ease-out
  z-index: 100
  &:after
  content: ''
  position: absolute
  width: 0
   height: 0
  top: 50%
margin-top: $arrow * -1px
left: $arrow * -1px
border-top: $arrow * 1px solid transparent
border-bottom: $arrow * 1px solid transparent
border-right: $arrow * 1px solid $bgcolor

  label
 display: inline-block
 vertical-align: center

input
background: white
border: 1px solid transparent
cursor: pointer
display: inline-block
overflow: visible
margin: 0
outline: 0
vertical-align: center
text-decoration: none
width: auto
border-radius: 3px
cursor: text
padding: 7px
&:focus
&:active
outline: none

 .submitted
  input
  &:invalid
    border: 1px solid red
    ~ .theTooltip
       visibility: visible
      opacity: 1
  &:valid
    ~ .theTooltip
      transition: opacity 0.3s, visibility 0s 0.3s

Answer 3

Example of Message with only css3

代码：

.tooltip, .arrow:after {
  background: black;
  border: 2px solid white;
}

.tooltip {
  pointer-events: none;
  opacity: 0;
  display: inline-block;
  position: absolute;
  padding: 10px 20px;
  color: white;
  border-radius: 20px;
  margin-top: 20px;
  text-align: center;
  font: bold 14px "Helvetica Neue", Sans-Serif;
  font-stretch: condensed;
  text-decoration: none;
  text-transform: uppercase;
  box-shadow: 0 0 7px black;
}
.arrow {
  width: 70px;
  height: 16px;
  overflow: hidden;
  position: absolute;
  left: 50%;
  margin-left: -35px;
  bottom: -16px;
}
.arrow:after {
   content: "";
   position: absolute;
   left: 20px;
   top: -20px;
   width: 25px;
   height: 25px;
   -webkit-box-shadow: 6px 5px 9px -9px black,5px 6px 9px -9px black;
   -moz-box-shadow: 6px 5px 9px -9px black,5px 6px 9px -9px black;
   box-shadow: 6px 5px 9px -9px black,5px 6px 9px -9px black;
  -webkit-transform: rotate(45deg);
  -moz-transform:    rotate(45deg);
  -ms-transform:     rotate(45deg);
  -o-transform:      rotate(45deg); 
}
.tooltip.active {
  opacity: 1;
  margin-top: 5px;
  -webkit-transition: all 0.2s ease;
  -moz-transition:    all 0.2s ease;
  -ms-transition:     all 0.2s ease;
  -o-transition:      all 0.2s ease;
}
.tooltip.out {
  opacity: 0;
  margin-top: -20px;
}