Animated placeholder with CSS / Tailwind
Tags: css, tailwindcss, webdev
Published: 2021-07-24 01:05:06

Hello everybody, in this article we will create animated placeholder using css and tailwind. To do that, we need to enable JIT on configuration file. Because `peer-` utility that we will use is working with JIT mode.

So, our `tailwind.config.js` file should be like this

```js
module.exports = {
  mode: 'jit',
  // other configs...
}
```

## CSS Way

So, let's see first how we can do with css? But first, we need html :)

```html
<div class="input-with-placeholder">
    <input type="text" id="username" />
    <label for="username">Username</label>
</div>
```

Basically, when we focus to input, then we need to use `+` selector to select label comes after input. But before we do that, let's write some css to make sure that example looks pretty :)

```css
/*
some reset css..
*/

.input-with-placeholder {
  width: 250px;
  position: relative;
}
.input-with-placeholder label {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  padding-left: 10px;
  transition: 300ms all;
}
.input-with-placeholder input {
  width: 100%;
  height: 40px;
  padding: 0 15px;
  background: #f8f8f8;
}
```

now it looks like this

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/b0wv57ph4u14eiohsjnu.png)

so, what's next? When we focus to input, we will change label position, font-size, height and padding-left properties.

```css
.input-with-placeholder input:focus + label {
  height: 50%;
  padding-left: 0;
  transform: translateY(-100%);
  font-size: 12px;
  color: #777;
}
```

so now, animation will works perfectly. you can check the gif :)

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/thr487ldyyws4yelazhe.gif)

but, when we write something to input, and when it lose focusable, label will back to normal style and we don't wanna do this right? So what can we do? Well, we can add `required` attribute to input, and then we can control with `:valid` in css. Let's do that.

add `required` attribute to input

```html
<input type="text" id="username" required />
```

we will use same css with ":focus" for ":valid", so we don't need to write again. we can use like this

```css
.input-with-placeholder input:focus + label,
.input-with-placeholder input:valid + label {
  height: 50%;
  padding-left: 0;
  transform: translateY(-100%);
  font-size: 12px;
  color: #777;
}
```

we did it!

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/io4c3qj1ufpewcuxjwy3.gif)

here's the demo.

{% codepen https://codepen.io/tayfunerbilen/pen/xxdPYJR %}

## Tailwind CSS Way

As I always said, how we can make it faster to development process? Using tailwind css, for sure :)

So, what we will use? We will use `group` and `peer` utilities.

Let's create html + css and explain everthing what we did.

```html
<div class="w-56 relative group">
    <input type="text" id="username" required class="w-full h-10 px-4 text-sm peer bg-gray-100 outline-none">
    <label for="username" class="transform transition-all absolute top-0 left-0 h-full flex items-center pl-2 text-sm group-focus-within:text-xs peer-valid:text-xs group-focus-within:h-1/2 peer-valid:h-1/2 group-focus-within:-translate-y-full peer-valid:-translate-y-full group-focus-within:pl-0 peer-valid:pl-0">Username</label>
</div>
```

so what we did?

`.w-56.relative.group` = we set width, relative for absolute label, group for using `group-focus-within`

`.w-full.h-10.px-4.text-sm.peer.bg-gray-100.outline-none` = we set width full, height 2.5 rem, padding left and right 1rem, font-size 0.875rem, peer for using `peer-valid`, background gray and no outline.

`.transform.transition-all.absolute.top-0.left-0.h-full.flex.items-center.pl-2.text-sm` = we positioned label into input, and we add transition for the animation and transform for using the translate.

when we focus to input, we changed the label styles like what we did in normal css with `group-focus-within`

`group-focus-within:text-xs.group-focus-within:h-1/2.group-focus-within:-translate-y-full.group-focus-within:pl-0` = so basically, we set font-size smaller, half height, -100% translate y and padding-left 0.

remember, when we write something to input, and when it lose focusable, label will back to normal style and we don't wanna do this right? so because of that, we used `peer` and `peer-valid` utilities.

we did same thing what we did in `group-focus-within`. And here's the demo.

{% codepen https://codepen.io/tayfunerbilen/pen/poPdaZM %}

### Quick tip

When your input in a form and when you don't want to validate some inputs, you can use `novalidate` attribute for `<form>` tag. So, css will still work, but you will not see any error message at all.

Thank you for reading, have a nice day.