Listen to undo/redo event in contenteditable div

问题

Is there a way to listen on all the ways a user could trigger an undo on a contenteditable div? For example when the user hits Control+Z, Right-click -> Undo, or in the file menu Edit -> Undo.

I'm not looking for undo/redo algorithms or implementations, just the ability to listen to the event and overwrite the behavior.

回答1:

Well, the Ctrl+Z/Y is possible, but I don't know about the Right-click->Undo/Redo part.

$(document).keydown(function (e) {
  var thisKey = e.which;

  if (e.ctrlKey) {
    if (thisKey == 90) alert('Undo');
    else if (thisKey == 89) alert('Redo');
  }
});

回答2:

Control z example at How to detect Ctrl+V, Ctrl+C using JavaScript?

for rightclick you can show a div on a right click How can I capture the right-click event in JavaScript?

then when they click the undo option on the div. just put in a onclick function.

来源：https://stackoverflow.com/questions/13319723/listen-to-undo-redo-event-in-contenteditable-div