Bootstrap5 表单浮动标签

默认情况下，标签内容一般显示在 input 输入框的上方：

使用浮动标签，可以在 input 输入框内插入标签，在单击 input 输入框时使它们浮动到上方

Bootstrap 实例

<
div

class
=
"
form-floating mb-3 mt-3
"
>

<
input

type
=
"
text
"

class
=
"
form-control
"

id
=
"
email
"

placeholder
=
"
Enter email
"

name
=
"
email
"
>

<
label

for
=
"
email
"
>
Email
</
label
>

</
div
>

<
div

class
=
"
form-floating mt-3 mb-3
"
>

<
input

type
=
"
text
"

class
=
"
form-control
"

id
=
"
pwd
"

placeholder
=
"
Enter password
"

name
=
"
pswd
"
>

<
label

for
=
"
pwd
"
>
Password
</
label
>

</
div
>

尝试一下 »

注意事项： <label> 元素必须在 <input> 元素之后，并且每个 <input> 元素都需要 placeholder 属性。

文本框

文本框 textarea 也可以有浮动效果：

Bootstrap 实例

<
div

class
=
"
form-floating
"
>

<
textarea

class
=
"
form-control
"

id
=
"
comment
"

name
=
"
text
"

placeholder
=
"
Comment goes here
"
>
</
textarea
>

<
label

for
=
"
comment
"
>
Comments
</
label
>

</
div
>

尝试一下 »

选择框

我们可以在选择菜单上使用浮动标签，它将始终显示在选择菜单的左上角，不会有点击浮动效果：

Bootstrap 实例

<
div

class
=
"
form-floating
"
>

<
select

class
=
"
form-select
"

id
=
"
sel1
"

name
=
"
sellist
"
>

<
option
>
1
</
option
>

<
option
>
2
</
option
>

<
option
>
3
</
option
>

<
option
>
4
</
option
>

</
select
>

<
label

for
=
"
sel1
"

class
=
"
form-label
"
>
Select list (select one):
</
label
>

</
div
>

尝试一下 »