Simple copy to clipboard button using javascript.

Simple click to copy button to copy value of textbox to clipboard.

 

//Add this function inside head tag

<script>
    function copyText() {
        /* Get the text field */
        var copyText = document.getElementById("myInput");
        /* Select the text field */
        copyText.select();
        /* Copy the text inside the text field */
        document.execCommand("copy");
        /* Alert the copied text */
        alert("Copied");
        }
    </script>

//Inside html file

<textarea value="" id="myInput" rows="1" cols="75">This value will be copies</textarea>

 //Button to trigger copy action

<button onclick="copyText()" class="btn btn-sm btn-primary">Copy link</button>