如何在搜索框中始终显示加号图标

Question

我有一个示例代码，显示的搜索框中包含一些带css的动画，并使用jquery来切换它。

在我的代码中，我有一个额外的span元素，右边有一个加号图标。在扩展搜索和签约时，如何保持加号图标（仅）始终可见？

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$("p").hide();
$('.opener').click(function() {
  $(this).parent('.search').toggleClass('inactive').find('input').focus();
  $(this).parent('.search').siblings('div.title').toggleClass('hideTitle')
});

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.row {
  border: 1px solid red;
}

.title {
  font-size: 16px;
  font-weight: bold;
  position: absolute;
  margin: 6px 0;
}

.input-group {
  display: flex;
  height: 36px;
  width: 100%;
  overflow: hidden;
  padding: 0;
  /*background-color: rgba(100, 100, 100, .1);*/
  cursor: pointer;
  /*border-radius: 2px;*/
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  /*box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);*/
}

.input-group:active,
.input-group:hover {
  /*background-color: rgba(100, 100, 100, .1);*/
}

.input-group.centered {
  margin: 0 auto;
}

.input-group .input-group-addon {
  justify-content: center;
  width: 36px;
  background: transparent;
  border: none;
  display: flex;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.input-group .input-group-addon i {
  height: 24px;
  width: 24px;
  align-self: center;
  color: #777;
}

.input-group input {
  font-family: "Roboto", sans-serif;
  background: transparent;
  border: none;
  box-shadow: none !important;
  font-size: 16px;
  padding: 0;
}

.inactive {
  width: 36px;
  border-radius: 18px;
  background: transparent;
  box-shadow: none;
}

.inactive .input-group-addon:not(:first-child) {
  opacity: 0;
}

.row {
  margin-top: 1em;
}

.hideTitle {
  display: none;
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<link href='https://fonts.googleapis.com/css?family=Roboto:400,300|Material+Icons' rel='stylesheet' type='text/css'>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>

<div class="container">
  <div class="row text-center">
    <h1>Search Inputs</h1>
  </div>

  <div class="row">
    <div class="title titleDiv">Title</div>
    <div class="input-group search inactive pull-right">
      <span class="input-group-addon opener">
				<i class="material-icons">search</i>
			</span>
      <input type="text" class="form-control" placeholder="Search">

      <span class="input-group-addon opener">
				<i class="material-icons">clear</i>
        <span class="input-group-addon add"><i class="material-icons">add</i></span>
      </span>
    </div>

  </div>
</div>

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Answer 1

用css怎么做？

.inactive .input-group-addon:not(:first-child) {
  **opacity: 1;**
}

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$("p").hide();
$('.opener').click(function() {
  $(this).parent('.search').toggleClass('inactive').find('input').focus();
  $(this).parent('.search').siblings('div.title').toggleClass('hideTitle')
});

＆＃13;

.row {
  border: 1px solid red;
}

.title {
  font-size: 16px;
  font-weight: bold;
  position: absolute;
  margin: 6px 0;
}

.input-group {
  display: flex;
  height: 36px;
  width: 100%;
  overflow: hidden;
  padding: 0;
  /*background-color: rgba(100, 100, 100, .1);*/
  cursor: pointer;
  /*border-radius: 2px;*/
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  /*box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);*/
}

.input-group:active,
.input-group:hover {
  /*background-color: rgba(100, 100, 100, .1);*/
}

.input-group.centered {
  margin: 0 auto;
}

.input-group .input-group-addon {
  justify-content: center;
  width: 36px;
  background: transparent;
  border: none;
  display: flex;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.input-group .input-group-addon i {
  height: 24px;
  width: 24px;
  align-self: center;
  color: #777;
}

.input-group input {
  font-family: "Roboto", sans-serif;
  background: transparent;
  border: none;
  box-shadow: none !important;
  font-size: 16px;
  padding: 0;
}

.inactive {
  width: 36px;
  border-radius: 18px;
  background: transparent;
  box-shadow: none;
}

.inactive .input-group-addon:not(:first-child) {
  **opacity: 1;**
}

.row {
  margin-top: 1em;
}

.hideTitle {
  display: none;
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<link href='https://fonts.googleapis.com/css?family=Roboto:400,300|Material+Icons' rel='stylesheet' type='text/css'>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>

<div class="container">
  <div class="row text-center">
    <h1>Search Inputs</h1>
  </div>

  <div class="row">
    <div class="title titleDiv">Title</div>
    <div class="input-group search inactive pull-right">
      <span class="input-group-addon opener">
				<i class="material-icons">search</i>
			</span>
      <input type="text" class="form-control" placeholder="Search">

      <span class="input-group-addon opener">
				<i class="material-icons">clear</i>
        <span class="input-group-addon add"><i class="material-icons">add</i></span>
      </span>
    </div>

  </div>
</div>

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