如何向文本类型输入框添加象形文字?例如，我想在用户名输入中有'icon-user'，就像这样:
当前回答
input { border:solid 1px #ddd; } input.search { padding-left:20px; background-repeat: no-repeat; background-position-y: 1px; background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAASCAYAAABb0P4QAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADbSURBVDhP5ZI9C4MwEIb7//+BEDgICA6C4OQgBJy6dRIEB6EgCNkEJ4e3iT2oHzH9wHbpAwfyJvfkJDnhYH4kHDVKlSAigSAQoCiBKjVGXvaxFXZnxBQYkSlBICII+22K4jM63rbHSthCSdsskVX9Y6KxR5XJSSpVy6GbpbBKp6aw0BzM0ShCe1iKihMXC6EuQtMQwukzPFu3fFd4+C+/cimUNxy6WQkNnmdzL3NYPfDmLVuhZf2wZYz80qDkKX1St3CXAfVMqq4cz3hTaGEpmctxDPmB0M/fCYEbAwZYyVKYcroAAAAASUVORK5CYII=); } <input class="search">
其他回答
用Bootstrap测试4。
获取一个表单控件，并将is-valid添加到它的类中。注意到控件如何变成绿色，但更重要的是，注意到控件右侧的复选符号图标吗?这就是我们想要的!
例子:
.my-icon { padding-right: calc(1.5em + .75rem); background-image: url('https://use.fontawesome.com/releases/v5.8.2/svgs/regular/calendar-alt.svg'); background-repeat: no-repeat; background-position: center right calc(.375em + .1875rem); background-size: calc(.75em + .375rem) calc(.75em + .375rem); } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script> <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script> <div class="container"> <div class="col-md-5"> <input type="text" id="date" class="form-control my-icon" placeholder="Select..."> </div> </div>
这里有另一种方法，通过在CSS中的伪元素之前使用:来放置象形文字。
工作演示在jsFiddle
对于这个HTML:
<form class="form form-horizontal col-xs-12">
<div class="form-group">
<div class="col-xs-7">
<span class="usericon">
<input class="form-control" id="name" placeholder="Username" />
</span>
</div>
</div>
</form>
使用这个CSS (Bootstrap 3。兼容基于webkit的浏览器)
.usericon input {
padding-left:25px;
}
.usericon:before {
height: 100%;
width: 25px;
display: -webkit-box;
-webkit-box-pack: center;
-webkit-box-align: center;
position: absolute;
content: "\e008";
font-family: 'Glyphicons Halflings';
pointer-events: none;
}
正如@Frizi所说，我们必须添加指针事件:none;这样光标就不会干扰到输入焦点。所有其他CSS规则都用于居中和添加适当的间距。
结果:
以下是它在纯Bootstrap 5中的工作原理:
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>iconbutton</title> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css" rel="stylesheet"> </head> <body> <div class="d-flex flex-row align-items-center m-4 border rounded"> <i class="fa-solid fa-search mx-2"></i> <input type="text" class="form-control border-0" placeholder="Search"> </div> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js"></script> </body> </html>
若要删除出现在焦点上的边框，请向输入添加shadow-0。
官方的方法。无需自定义CSS:
<form class="form-inline" role="form">
<div class="form-group has-success has-feedback">
<label class="control-label" for="inputSuccess4"></label>
<input type="text" class="form-control" id="inputSuccess4">
<span class="glyphicon glyphicon-user form-control-feedback"></span>
</div>
</form>
演示:http://jsfiddle.net/yajf3b7q
这个演示是基于Bootstrap文档中的一个例子。向下滚动到“可选图标”http://getbootstrap.com/css/#forms-control-validation
对于Bootstrap 3.3.5，我也有一个决定:
<div class="col-sm-5">
<label for="date">
<input type="date" placeholder="Date" id="date" class="form-control">
</label>
<i class="glyphicon glyphicon-calendar col-sm-pull-2"></i>
</div>
对于输入，我有这样的东西:
