# Textarea with limit bar

> A bar under the text fills as you type and turns red when you get close to the limit.

- Category: [Inputs](https://library.aimran.es/components/inputs)
- Built with: HTML + CSS
- Live editor: https://library.aimran.es/blocks/uv-in2-counter
- Library: AIMRAN Library (https://library.aimran.es), free, no sign-up, by Aimran Oukham

## Where to use it

A character counter helps wherever space is tight: the bio on a profile page, the message on a gift card, a short review or the text of an SMS campaign. The bar shows how much room is left, and turns red before you hit the wall. A textarea with a character limit, in HTML, CSS and a bit of JavaScript.

The demo allows 80 characters and warns at 68. If you change the limit, update the counter too, and give the warning some margin so people can finish their sentence calmly.

## Code

### HTML

```html
<label class="uv-in2n"><textarea maxlength="80" rows="3" placeholder="Write your bio"></textarea><div class="ft"><span class="bar"><i></i></span><b class="ct">0/80</b></div></label>
```

### CSS

```css
.uv-in2n {
  --c1: #0071e3;
  --c2: #8ec5ff;
  --s: 16px;
  /* tamaño */
  --k: 1;
  /* velocidad */
  --fg: #1d1d1f;
  /* texto */
  --bg: #f5f5f7;
  /* fondo */
}

.uv-in2n {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: block;
  width: 17em;
}

.uv-in2n textarea {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  width: 100%;
  box-sizing: border-box;
  padding: .9em 1em;
  font-size: var(--s);
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 5%,transparent);
  border: 0;
  outline: 0;
  border-radius: .9em;
  resize: none;
  box-shadow: inset 0 0 0 1.6px color-mix(in srgb,var(--fg) 10%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n textarea:focus {
  box-shadow: inset 0 0 0 1.8px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 14%,transparent);
}

.uv-in2n .ft {
  display: flex;
  align-items: center;
  gap: .7em;
  margin-top: .6em;
}

.uv-in2n .bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
  overflow: hidden;
}

.uv-in2n .bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: var(--c1);
  transition: width calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),background calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n .ct {
  font-size: calc(var(--s) * .74);
  font-weight: 700;
  opacity: .55;
  font-variant-numeric: tabular-nums;
  transition: color calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),opacity calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n.warn .bar i {
  background: #ff375f;
}

.uv-in2n.warn .ct {
  color: #ff375f;
  opacity: 1;
}
```

### JavaScript

```js
document.querySelectorAll(".uv-in2n").forEach(el => {
  const t=el.querySelector("textarea"),i=el.querySelector(".bar i"),c=el.querySelector(".ct");t.addEventListener("input",()=>{const n=t.value.length;i.style.width=n/80*100+"%";c.textContent=n+"/80";el.classList.toggle("warn",n>=68)})
});
```

### React

```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-in2n {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: block;
  width: 17em;
}

.uv-in2n textarea {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  width: 100%;
  box-sizing: border-box;
  padding: .9em 1em;
  font-size: var(--s);
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 5%,transparent);
  border: 0;
  outline: 0;
  border-radius: .9em;
  resize: none;
  box-shadow: inset 0 0 0 1.6px color-mix(in srgb,var(--fg) 10%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n textarea:focus {
  box-shadow: inset 0 0 0 1.8px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 14%,transparent);
}

.uv-in2n .ft {
  display: flex;
  align-items: center;
  gap: .7em;
  margin-top: .6em;
}

.uv-in2n .bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
  overflow: hidden;
}

.uv-in2n .bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: var(--c1);
  transition: width calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),background calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n .ct {
  font-size: calc(var(--s) * .74);
  font-weight: 700;
  opacity: .55;
  font-variant-numeric: tabular-nums;
  transition: color calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),opacity calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n.warn .bar i {
  background: #ff375f;
}

.uv-in2n.warn .ct {
  color: #ff375f;
  opacity: 1;
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const t=el.querySelector("textarea"),i=el.querySelector(".bar i"),c=el.querySelector(".ct");t.addEventListener("input",()=>{const n=t.value.length;i.style.width=n/80*100+"%";c.textContent=n+"/80";el.classList.toggle("warn",n>=68)})
}

export default function In2Counter() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-in2n"><textarea maxLength={80} rows={3} placeholder="Write your bio"></textarea><div className="ft"><span className="bar"><i></i></span><b className="ct">0/80</b></div></label>
      </div>
    </>
  );
}
```

## Prompt for AI assistants

Paste this into ChatGPT, Claude, Cursor, v0 or Lovable to adapt the block to your stack (Tailwind, Vue, Svelte…):

````text
I want to add the “Textarea with limit bar” block (Inputs) from AIMRAN Library to my project.

## What it is
A bar under the text fills as you type and turns red when you get close to the limit.

## Chosen settings
- Main color: #0071e3
- Secondary color: #8ec5ff
- Size: 16px (from 12 to 24px)
- Speed: 1x (from 0.5 to 2x)
- Text: "Write your bio"

## What I need
1. Add it to my project with the same look and animation as the reference code: same sizes, colours, radii, shadows, timings and easing.
2. It is built with plain HTML and CSS (the reference wraps it in a React component with its CSS). If my project uses something else (Vue, Svelte, Astro, plain HTML…), translate it without losing any behaviour. If I use Tailwind, turn the styles into classes; if not, keep the CSS in its own file.
3. Expose the settings above as props (or CSS variables) with those values as defaults.
4. Make it work well on phones: nothing that depends only on hover, touch targets of at least 44 px and no overflow on 320 px screens.
5. Make it look right in light and dark mode.
6. Keep it accessible: semantic HTML, roles and aria-* where needed, visible focus and keyboard support.
7. Respect prefers-reduced-motion: with reduced motion, no big animations but the same end result.

## Reference code
```tsx
// @ts-nocheck: setup() es JavaScript del DOM sin tipos, el mismo de la pestaña JS.
import { useEffect, useRef, type CSSProperties } from "react";

const css = `
.uv-in2n {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  font-size: var(--s);
  color: var(--fg);
  -webkit-tap-highlight-color: transparent;
  display: block;
  width: 17em;
}

.uv-in2n textarea {
  font-family: -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",system-ui,sans-serif;
  width: 100%;
  box-sizing: border-box;
  padding: .9em 1em;
  font-size: var(--s);
  color: var(--fg);
  background: color-mix(in srgb,var(--fg) 5%,transparent);
  border: 0;
  outline: 0;
  border-radius: .9em;
  resize: none;
  box-shadow: inset 0 0 0 1.6px color-mix(in srgb,var(--fg) 10%,transparent);
  transition: box-shadow calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n textarea:focus {
  box-shadow: inset 0 0 0 1.8px var(--c1),0 0 0 4px color-mix(in srgb,var(--c1) 14%,transparent);
}

.uv-in2n .ft {
  display: flex;
  align-items: center;
  gap: .7em;
  margin-top: .6em;
}

.uv-in2n .bar {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb,var(--fg) 12%,transparent);
  overflow: hidden;
}

.uv-in2n .bar i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: var(--c1);
  transition: width calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),background calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n .ct {
  font-size: calc(var(--s) * .74);
  font-weight: 700;
  opacity: .55;
  font-variant-numeric: tabular-nums;
  transition: color calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1),opacity calc(0.3s / var(--k)) cubic-bezier(.25,.1,.25,1);
}

.uv-in2n.warn .bar i {
  background: #ff375f;
}

.uv-in2n.warn .ct {
  color: #ff375f;
  opacity: 1;
}
`;

// Interacción en JavaScript del DOM: la misma que en la pestaña JS.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function setup(el: any) {
  const t=el.querySelector("textarea"),i=el.querySelector(".bar i"),c=el.querySelector(".ct");t.addEventListener("input",()=>{const n=t.value.length;i.style.width=n/80*100+"%";c.textContent=n+"/80";el.classList.toggle("warn",n>=68)})
}

export default function In2Counter() {
  const ref = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const el = ref.current?.firstElementChild;
    return el ? setup(el) : undefined;
  }, []);

  return (
    <>
      <style>{css}</style>
      <div
        ref={ref} style={{
          "--c1": "#0071e3",
          "--c2": "#8ec5ff",
          "--s": "16px",
          "--k": "1",
          "--fg": "#1d1d1f",
          "--bg": "#f5f5f7",
        } as CSSProperties}
      >
        <label className="uv-in2n"><textarea maxLength={80} rows={3} placeholder="Write your bio"></textarea><div className="ft"><span className="bar"><i></i></span><b className="ct">0/80</b></div></label>
      </div>
    </>
  );
}
```

Give me the complete final code, ready to paste, and tell me in one line where to put it in my project.
````