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ASCII Control Codes Keyboard Input Helper for Firefox

This is a script to help inputting ASCII Control Codes such as TAB, CR, LF, etc. on Firefox web browsers using ALT+Numpad keys. Inputted control codes must begin with 0 (e.g. 09, 013, etc.), and only control code 1 to 31 are accepted. The control character will only be generated when the current focus is on a TEXTAREA element, or a text typed INPUT element.

当前为 2017-09-11 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         ASCII Control Codes Keyboard Input Helper for Firefox
  3. // @namespace    ASCIIControlCodesKeyboardInputHelperForFirefox
  4. // @version      1.0.1
  5. // @description  This is a script to help inputting ASCII Control Codes such as TAB, CR, LF, etc. on Firefox web browsers using ALT+Numpad keys. Inputted control codes must begin with 0 (e.g. 09, 013, etc.), and only control code 1 to 31 are accepted. The control character will only be generated when the current focus is on a TEXTAREA element, or a text typed INPUT element.
  6. // @author       jcunews
  7. // @include      *://*/*
  8. // @grant        none
  9. // @run-at       document-start
  10. // ==/UserScript==
  11.  
  12. var numpadKeyCodes = [45, 35, 40, 34, 37, 12, 39, 36, 38, 33]; //Insert, End, Down, PgDn, Left, Clear, Right, Home, Up, PgUp
  13. var code = "";
  14.  
  15. function numFromKeyCode(keyCode) {
  16.   if ((keyCode >= 96) && (keyCode <= 105)) { //Numpad0 - Numpad9
  17.     return keyCode - 96;
  18.   } else return numpadKeyCodes.indexOf(keyCode);
  19. }
  20.  
  21. function keyUp(ev, ele, cc, i, s) {
  22.   ele = document.activeElement;
  23.   if ((ele.tagName === "TEXTAREA") || ((ele.tagName === "INPUT") && (ele.type === "text"))) {
  24.     ev = ev || window.event;
  25.     if (ev.altKey) {
  26.       cc = numFromKeyCode(ev.keyCode);
  27.       if (cc >= 0) code += cc;
  28.     } else {
  29.       if ((ev.keyCode === 18 /*ALT*/) && (code.charAt(0) === "0") && (code = parseInt(code, 10)) && (code < 32)) {
  30.         i = ele.selectionStart;
  31.         s = ele.value;
  32.         ele.value = s.substring(0, i) + String.fromCharCode(code) + s.substring(ele.selectionEnd, s.length);
  33.         ele.selectionEnd = i + 1;
  34.       }
  35.       code = "";
  36.     }
  37.   } else code = "";
  38. }
  39.  
  40. if (window.InstallTrigger) document.addEventListener("keyup", keyUp);