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execCommand('copy') does not work in Ajax / XHR callback?

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鱼传尺愫
鱼传尺愫 2020-12-10 15:45

(Tested using Chrome 44)

Desired behaviour: Make XHR request, put result in text area, select text, and copy to clipboard.

Actual be

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  • 孤城傲影
    2020-12-10 16:07

    DISCLAIMER: Synchronous XMLHttpRequests are not recommended on the main thread. Please read this and make sure you know what you're doing before using this solution. THIS IS NOT RECOMMENDED FOR PRODUCTION USE.

    If you make the XMLHttpRequest synchronous, this will work. You just have to add false as the third parameter to xhr.open(...):

    var selectAndCopy = function() {
  // Select text
  var cutTextarea = document.querySelector('#textarea');
  cutTextarea.select();
  // Execute copy
  var successful = document.execCommand('copy');
  var msg = successful ? 'successful' : 'unsuccessful';
  console.log('Cutting text command was ' + msg);
};

var fetchCopyButton = document.querySelector('#fetch_copy');
fetchCopyButton.addEventListener('click', function(event) {
  var xhr = new XMLHttpRequest();
  xhr.open('get', 'http://httpbin.org/ip', false);
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4) {
      if (xhr.status === 200) {
        // Set text
        var textarea = document.querySelector('#textarea');
        textarea.value = xhr.responseText;

        selectAndCopy();
      }
    }
  };
  xhr.send();
});

var copyButton = document.querySelector('#copy');
copyButton.addEventListener('click', function(event) {
  selectAndCopy();
});
    <html>

<head>
</head>

<body>
  <p>
    <textarea id="textarea">Hello, I'm some text!</textarea>
  </p>
  <p>
    <button id="fetch_copy">Fetch Data and Copy Textarea</button>
    <button id="copy">Copy Textarea</button>
  </p>
</body>

</html>

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  • 借酒劲吻你
    2020-12-10 16:11

    You can only trigger a copy to the system clipboard in direct response to a trusted user action, such as a click event.

    Spec: http://www.w3.org/TR/clipboard-apis/#integration-with-rich-text-editing-apis

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