[Webkit-unassigned] [Bug 156529] document.execCommand("copy") only triggers if there is a selection.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Sep 23 14:15:45 PDT 2016


--- Comment #4 from Lucas Garron <lgarron at chromium.org> ---
Gentle ping. :-)

Since this shipped with Safari 10, I had to add the following workaround to my clipboard shim library [1]:

    // Workaround for Safari: https://bugs.webkit.org/show_bug.cgi?id=156529
    function bogusSelect() {
      var sel = document.getSelection();
      // If "nothing" is selected...
      if (!document.queryCommandEnabled("copy") && sel.isCollapsed) {
        // ... temporarily select the entire body.
        // We select the entire body because:
        // - it's guaranteed to exist,
        // - it works (unlike, say, document.head, or phantom element that is
        //   not inserted into the DOM),
        // - it doesn't seem to flicker (due to the synchronous copy event), and
        // - it avoids modifying the DOM (can trigger mutation observers).
        // Because we can't do proper feature detection (we already checked
        // document.queryCommandEnabled("copy") , which actually gives a false
        // negative for Blink when nothing is selected) and UA sniffing is not
        // reliable (a lot of UA strings contain "Safari"), this will also
        // happen for some browsers other than Safari. :-()
        var range = document.createRange();
        _bogusSelection = true;

This feels very fragile. :-(

[1] https://github.com/lgarron/clipboard.js

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