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JavaScript: Copy a string to the clipboard

JavaScript fundamental (ES6 Syntax): Exercise-2 with Solution

Write a JavaScript program to copy a string to the clipboard.

  • Create a new <textarea> element, fill it with the supplied data and add it to the HTML document.
  • Use Selection.getRangeAt()to store the selected range (if any).
  • Use Document.execCommand('copy') to copy to the clipboard.
  • Remove the <textarea> element from the HTML document.
  • Finally, use Selection().addRange() to recover the original selected range (if any).

NOTICE: The same functionality can be easily implemented by using the new asynchronous Clipboard API, which is still experimental but should be used in the future instead of this snippet.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2
  const copy_to_Clipboard = str => {
  const el = document.createElement('textarea');
  el.value = str;
  el.setAttribute('readonly', '');
  el.style.position = 'absolute';
  el.style.left = '-9999px';
  document.body.appendChild(el);
  const selected =
    document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;
  el.select();
  document.execCommand('copy');
  document.body.removeChild(el);
  if (selected) {
    document.getSelection().removeAllRanges();
    document.getSelection().addRange(selected);
  }
};

Flowchart:

flowchart: Copy a string to the clipboard

Live Demo:

See the Pen javascript-basic-exercise-1-2 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to compare two objects to determine if the first one contains equivalent property values to the second one.
Next: Write a JavaScript program to converts a comma-separated values (CSV) string to a 2D array.

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JavaScript: Tips of the Day

How to remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

function removeItemOnce(arr, value) {
  var index = arr.indexOf(value);
  if (index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

function removeItemAll(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))

Ref: https://bit.ly/2N9nKRp