keycodes | JavaScript Key Codes | Script Programming library

Personally, I would go about this by storing each keystroke's keyCode into an array, and then checking the last X number of items in that keylogger array and match that against the patterns you want to listen for.

To keep that array lightweight as you mentioned, I would trim the array length on every keystroke to the array length of your longest pattern, which would be the maximum number of keystrokes necessary to track all your patterns.

When comparing the most recently typed keys, I am unshifting the new key codes to add them to the beginning of the keylog array and then comparing that to the reversed state of every pattern to check from right to left. This is crucial since we are continually trimming off the last characters from the array, the oldest characters. The most recent characters will always appear first in the keylog array. To make a shallow reverse of the pattern, so as not to mutate the original pattern's order, I use .slice().reverse().

Lastly, in order to get accurate keyCodes for lowercase and uppercase letters, I take e.key.charCodeAt() if the key property of the event is exactly one character. Without this, all letters are rendered as uppercase and certain characters such as "slashes" will have the wrong charCode.

Try it out here:

Using includes:

It sounds like this code isn't being processed by TypeScript. That's the error you'd get if it were being processed directly by the JavaScript engine:

when deploying frontend applications, I find actually netlify easier to work with, have you tried that, as you only need to do

Run npm i @angular/cdk -d command at CLI

If you call TranslateMessage in your message loop, this function will cause an additional WM_CHAR message to be created when a WM_KEYDOWN message is received. This WM_CHAR message will contain the typed character, taking into account whether the SHIFT key is pressed. For example, if the user types a b will holding the SHIFT key, then the WM_CHAR message will contain the character code for a B.

As stated above, TranslateMessage will do all the work for you. If, for some reason, you do not want to use this function, you could try using the functions ToAscii or ToUnicode instead. But, as stated in the documentation, these functions have the disadvantage that they are unable to handle dead keys properly. Therefore, I recommend using TranslateMessage.

I just want to say, this question became a fun learning adventure. But....

As it turns out KeyboardEvent.keyCode has been deprecated for a while. Because it uses the decimal version of ASCII. The correct code to use is actually event.Code. But that's not what you're after.

To get the ascii number, you can just use event.key.charCodeAt() This does have some flaws as it will report S when you hit shift. But you can use event.location to figure out if the key is a special control key. Zero is standard keys and 1-3 are special locations (I think).

It looks like this code is setting this.tags to null.

Random drive-by idea that I am too lazy to test: