cut, copy, paste events handler issues

[songhn233]

The cut, copy prevention demo failed to show anything for event.clipboardData.getData('text/plain')

Change the code to the following and it will work

<input type="text" id="input">
<script>
  input.onpaste = function(event) {
    alert(event.type + ' - ' + event.clipboardData.getData('text/plain'));
    return false; // Equal to `event.preventDefault()`
  };
  input.oncut = input.oncopy = function(event) {
    alert(event.type + '-' + document.getSelection());
    return false;
  }
</script>

In addition, as mentioned above, We can also use event.preventDefault() to abort the action, so return false code should be added with a description equivalent to event.preventDefault().

Related issue: javascript-tutorial/zh.javascript.info#956

[joaquinelio]

👍

mdn defines getData for paste only

i guess cut/copy falls under "ClipboardAPI: user safety restrictions" below
clipboard may have data from anywhere

[joaquinelio]

i put a PR
single change

"Alternatively, the code below also prevents all such events and additionally shows what we are trying to cut/copy/paste:"

I'd suggest the code comment being " // false prevents changes" both returns

Your fix works, you may want to add a PR
regarding the getData issue, I dont know how deep the author wants to go

just suggestions, I'm nobody here :)

[songhn233]

"Alternatively, the code below also prevents all such events and additionally shows what we are trying to cut/copy/paste:"

I'd suggest the code comment being " // false prevents changes" both returns

Thank you for the suggestion, I will create a PR later.

[iliakan]

Thank you, a good catch!
I rewrote this section. Please reopen if anything's wrong ;)