Ace editor, how to remove all keyBindings but one?

问题

I recently had a textarea on my jsp page

For it, I had my own shortcuts on the keyboard

Then, I implemented the ace editor, and all my old keybindings didn't work then

Then i searched for a while, and found this code:

    //I did this before, to add the ace editor
    var editor = ace.edit("fileInfo");
    var JavaScriptMode = ace.require("ace/mode/javascript").Mode;
    editor.session.setMode(new JavaScriptMode()); 

   //Then I found this for the keyBindings
    delete editor.keyBinding;

The last line, disables all the keyBindings from the ace editor, and my own keyBindings came to work... All worked fine, but then, I searched a lot about the ace editor, and found one interesting option, and thet is the one keyBinding, that I love to use, and that is the DELETE ROW keybinding Ctrl + D

and I want now to get it back, but only it, not the others, and ofc my old keyBindings should also work...

The code for my old keyBindings looks like this:

document.addEventListener("keydown", function(e) {
            // Ctrl + S = SAVE
            if (e.keyCode == 83 && (navigator.platform.match("Mac") ? e.metaKey : e.ctrlKey))      {
                e.preventDefault();
                e.stopPropagation();
                if($scope.mode!='BROWSE')
                {
                    $('#saveBtn').trigger("click");
                }
            }
}, false);

Can u help me?

回答1:

delete editor.keyBinding; is not a good solution, it will produce error messages in console

Uncaught TypeError: Cannot read property 'ctrl-d' of undefined at CommandManager.handleKeyboard (ace.js:10830) at KeyBinding.$callKeyboardHandlers (ace.js:4081) at KeyBinding.onCommandKey (ace.js:4113) at Editor.onCommandKey (ace.js:12424) at normalizeCommandKeys (ace.js:1648) at HTMLTextAreaElement. (ace.js:1667)

Option 1: delete all bindings and redefine the one we need.

//safely delete all bindings
editor.keyBinding.$defaultHandler.commandKeyBinding = {}
//bind the wanted command
editor.commands.addCommand({
    name: "removeline",
    bindKey: { win: "Ctrl-D", mac: "Command-D" },
    exec: function(editor) { editor.removeLines(); },
    scrollIntoView: "cursor",
    multiSelectAction: "forEachLine"
});

now that you have the command defined, you can call it from your own code if needed:

editor.execCommand("removeline")

Option 2: actually looping through the bindings.

using for (key in obj) to loop through the key bindings and deleting keys that are not equal to ctrl-d and command-d:

for (key in editor.keyBinding.$defaultHandler.commandKeyBinding) {
    if (key !== "ctrl-d" && key !== "command-d")
        delete editor.keyBinding.$defaultHandler.commandKeyBinding[key]
}

来源：https://stackoverflow.com/questions/42410689/ace-editor-how-to-remove-all-keybindings-but-one