Implementado un clipboard en javascript

En el día implementaremos un utilitario que nos permitirá copiar un determinado texto sin necesidad de seleccionarlo para ellos crearemos un sencilla aplicación con la siguiente estructura:

javascript-clipboard/
├── css
│   └── main.css
├── index.html
└── js
    └── main.js

en el fichero index.html ponemos

<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="css/main.css">
  <title>Clipboard example</title>
</head>

<body>
  <div class="container">
    <button class="clipboard" data-target=".clipboard-content">
      <span class="icon">
        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard"
          viewBox="0 0 16 16">
          <path
            d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z" />
          <path
            d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z" />
        </svg>
      </span>
    </button>
    <p class="clipboard-content">The clipboard is a buffer that some operating systems provide for short-term storage
      and transfer within and between application programs. The clipboard is usually temporary and unnamed, and its
      contents reside in the computer's RAM.</p>
    <p class="clipboard-content">The clipboard provides an application programming interface by which programs can
      specify cut, copy and paste operations. It is left to the program to define methods for the user to command these
      operations, which may include keybindings and menu selections.</p>
  </div>
  <script src="js/main.js"></script>
</body>

</html>

Texto tomado de Wikipedia

Note el atributo data-target del elemento button el cual define los elementos a los cuales le queremos copiar su contenido luego debemos agregar la clase correspondiente: clipboard-content a dichos elementos.

Íconos en formato svg cortesía de: https://icons.getbootstrap.com/

Agregamos al fichero main.css

.container {
  background-color: #bfd9fe;
  width: 600px;
  margin: auto;
  position: relative;
  padding: 10px;
  top: 30px;
}

button {
  position: absolute;
  right: 5px;
  top: 5px;
  border: 0;
  padding: 4px;
  text-align: center;
  display: inline-block;
  color: #ffffff;
  background-color: #36a2eb;
  border-radius: 4px;
  transition: box-shadow 200ms ease-out;
  cursor: pointer;
}

Ahora nuesto ejemplo se debe ver de la siguiente manera:

Ahora la parte javascript

Primero seleccionamos todos los elementos que tienen asociada la clase: .clipboard e iteramos por cada uno de los nodos encontrados:

document.querySelectorAll('clipboard').forEach(el => {
    console.log(el)
})

Para cada uno de los nodos encontrados le asociamos un manipulador de eventos para el evento click.

el.addEventListener('click', ev => {
    console.log(ev)
})

Dentro del manipulador de eventos obtenemos los elementos de los cuales deseamos copiar su contenido.

// target tiene el valor de .clipboard-content
const target = e.currentTarget.dataset.target

Obtenemos todos los nodos que tiene la clase .clipboard-content asociada convertimos el resultado a un iterador y luego a un arreglo, por último obtenemos el contenido de cada elemento y lo concatenamos usando una nueva líena.

const nodes = document.querySelectorAll(target).values()
let content = Array.from(nodes)
content = content.map(c => c.innerHTML).join("\n")

Para implementar la funcionalidad del clipboard debemos usar el método navigator.clipboard.writeText el cuál permite escribir una contenido determinado al portapapeles del sistema, este método devuele una Promesa (Promise) por tanto en nuestro caso

navigator.clipboard.writeText("algun contenido").then(
  () => {
    /* clipboard Ok */
  },
  () => {
    /* clipboard falló */
  }
)

Para nuestro caso lo planteamos así:

document.querySelectorAll('.clipboard').forEach(el => {
    el.addEventListener('click', e => {
        const icon = e.currentTarget.querySelector('.icon')
        const target = e.currentTarget.dataset.target
        const content = Array.from(document.querySelectorAll(target).values()).map(c => c.innerHTML).join("\n")
        console.log(content)
        navigator.clipboard.writeText(content).then(
            () => {
                console.log('Portapeles copiado')
                icon.innerHTML = `
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard-check" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M10.854 7.146a.5.5 0 0 1 0 .708l-3 3a.5.5 0 0 1-.708 0l-1.5-1.5a.5.5 0 1 1 .708-.708L7.5 9.793l2.646-2.647a.5.5 0 0 1 .708 0z"/>
                        <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                        <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                    </svg>`

                setTimeout(() => {
                    icon.innerHTML = `
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard" viewBox="0 0 16 16">
                            <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                            <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                        </svg>`
                }, 3000)
            },
            () => {
                console.log('Falló la operación de copiado al portapapeles')
                icon.innerHTML = `
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard-x" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M6.146 7.146a.5.5 0 0 1 .708 0L8 8.293l1.146-1.147a.5.5 0 1 1 .708.708L8.707 9l1.147 1.146a.5.5 0 0 1-.708.708L8 9.707l-1.146 1.147a.5.5 0 0 1-.708-.708L7.293 9 6.146 7.854a.5.5 0 0 1 0-.708z"/>
                        <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                        <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                    </svg>
                   `
                setTimeout(() => {
                    icon.innerHTML = `
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard" viewBox="0 0 16 16">
                            <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                            <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                        </svg>`
                }, 3000)
            }
        )
    }
    )
}
)

Los íconos usados son los siguientes:

Todo el código javascript quedaría:

document.querySelectorAll('.clipboard').forEach(el => {
    el.addEventListener('click', e => {
        const icon = e.currentTarget.querySelector('.icon')
        const target = e.currentTarget.dataset.target
        const content = Array.from(document.querySelectorAll(target).values()).map(c => c.innerHTML).join("\n")
        console.log(content)
        navigator.clipboard.writeText(content).then(
            () => {
                console.log('Contenido copiado al portapapeles')
                icon.innerHTML = `
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard-check" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M10.854 7.146a.5.5 0 0 1 0 .708l-3 3a.5.5 0 0 1-.708 0l-1.5-1.5a.5.5 0 1 1 .708-.708L7.5 9.793l2.646-2.647a.5.5 0 0 1 .708 0z"/>
                        <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                        <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                    </svg>`

                setTimeout(() => {
                    icon.innerHTML = `
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard" viewBox="0 0 16 16">
                            <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                            <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                        </svg>`
                }, 3000)
            },
            () => {
                console.log('Falló la operación de copiado al portapapeles')
                icon.innerHTML = `
                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard-x" viewBox="0 0 16 16">
                        <path fill-rule="evenodd" d="M6.146 7.146a.5.5 0 0 1 .708 0L8 8.293l1.146-1.147a.5.5 0 1 1 .708.708L8.707 9l1.147 1.146a.5.5 0 0 1-.708.708L8 9.707l-1.146 1.147a.5.5 0 0 1-.708-.708L7.293 9 6.146 7.854a.5.5 0 0 1 0-.708z"/>
                        <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                        <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                    </svg>
                   `
                setTimeout(() => {
                    icon.innerHTML = `
                        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-clipboard" viewBox="0 0 16 16">
                            <path d="M4 1.5H3a2 2 0 0 0-2 2V14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V3.5a2 2 0 0 0-2-2h-1v1h1a1 1 0 0 1 1 1V14a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V3.5a1 1 0 0 1 1-1h1v-1z"/>
                            <path d="M9.5 1a.5.5 0 0 1 .5.5v1a.5.5 0 0 1-.5.5h-3a.5.5 0 0 1-.5-.5v-1a.5.5 0 0 1 .5-.5h3zm-3-1A1.5 1.5 0 0 0 5 1.5v1A1.5 1.5 0 0 0 6.5 4h3A1.5 1.5 0 0 0 11 2.5v-1A1.5 1.5 0 0 0 9.5 0h-3z"/>
                        </svg>`
                }, 3000)
            }
        )
    }
    )
}
)

Puede descargarse el ejemplo desde: https://gitea.com/sedlav/javascript-clipboard

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