Hi lieve Twiekers van mij,
Heb onlangs deze extensie gedownload voor Google Chrome.
http://www.chromeextensio...oning/keyboardnavigation/ daar ik vrijwel alleen de toetsenbord gebruik (zonder muis).
Werkt prima en wel. En wat wil het geval? Je activeert hem met ALT + G combinatie. Aangezien ik vrijwel met mijn numpad navigeer, wil ik deze extensie activeren door op Del te drukken op numpad (dat knop met punt erboven), of andere knoppen bij Numpad (zoals slash teken /, sterretje *, min en plusteken).
Een snelle blik op deze extensie leert mij dat deze in javascript gemaakt is.
Dit is het volledige code van de extensie:
Wellicht dat 47 Java-taal staat voor G, dit heb ik veranderd in 46, en met ALT + F getest om te kijken of het enig effect zou sorteren. Geen resultaat.
Wellicht dat dit
Wanneer ik beide 7B codes vervang door 0x53, vervolgens Chrome opnieuw starten.. geen resultaat met DEL. Wel dat ALT + G nog werkt.. met als nieuw effect dat de letter S de extensie ook activeert
.
S blijkt in principe óók hex 53 te zijn.
Veranderd in 1x53. Zonder resultaat, en de ALT+G werkt nog steeds. Wellicht dat de ALT+G ergens anders in het scriptje verborgen zit, maar ik kan hem niet vinden.
Twiekers die weten waar Alt + G in de code verschuild staat
Heb onlangs deze extensie gedownload voor Google Chrome.
http://www.chromeextensio...oning/keyboardnavigation/ daar ik vrijwel alleen de toetsenbord gebruik (zonder muis).
Werkt prima en wel. En wat wil het geval? Je activeert hem met ALT + G combinatie. Aangezien ik vrijwel met mijn numpad navigeer, wil ik deze extensie activeren door op Del te drukken op numpad (dat knop met punt erboven), of andere knoppen bij Numpad (zoals slash teken /, sterretje *, min en plusteken).
Een snelle blik op deze extensie leert mij dat deze in javascript gemaakt is.
Dit is het volledige code van de extensie:
code:
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| // KeyNav
// version 0.1.1 beta
// Itamar Benzaken
//
// Modified for Google Chrome by Anton Kovalenko
// --------------------------------------------------------------------
//
// This is a Greasemonkey user script.
//
// --------------------------------------------------------------------
//
// ==UserScript==
// @name KeyNav
// @description Enables keyboard navigation
// @namespace tag:itamar.benzaken@gmail.com,2008-09-10:KeyNav
// @include *
// ==/UserScript==
/*
@what
The script enables keyboard navigation.
@how
Pressing a hotkey displays a (or hides the) label near each clickable element.
Pressing the shortcut triggers the "click" for the associated element.
@structure
- A Map object: enables mapping of a String (the shortcut) to an Object (the DOM element).
- A Configuration object: contains anything that can be "externalized" (preferences, actual label generation, etc).
- A KeyNav object: the main object that handles all the messy stuff.
@changelog
0.1
initial
0.1.1
- added labels index for faster looking up of labels
- moved creation of labels to initialization
- added event handler for invalidating labels when document changes
*/
//javascript.options.strict = true;
//browser.dom.window.dump.enabled = true;
function Map() {
function LOG(message) {
//window.dump( "[Map] " + message + "\n");
}
// internal map
var map;
var bEmpty;
/* returns the value associated with the given key
*
* @param key
* @return the associated value, or null if none
*/
this.getValue = function (key) {
if (key in map)
return map[key];
return null;
};
/* returns a set of values whose keys pass a certain filter
*
* @param predicate a filter Function [key->Boolean] that returns True
* iff the key's value should be included in the result set
* @return a values Array
*/
this.getValuesByPredicate = function (predicate) {
var values = new Array(0);
for (key in map) {
if ( predicate(key) ) {
values.push( map[key] );
}
}
return values;
};
/* add a key=value binding
*
* @param val
* @param key
*/
this.setValue = function (key, val) {
bEmpty = false;
map[key] = val;
LOG( "bound \"" + key + "\" to " + val);
};
this.clear = function () {
map = new Object();
bEmpty = true;
};
this.isEmpty = function() {
return bEmpty;
};
this.keys = function () {
var keys = new Array();
for ( var key in map ) {
keys.push(key);
}
return keys;
};
this.values = function () {
var values = new Array();
for ( var key in map ) {
values.push( map[key] );
}
return values;
};
this.clear();
}
/* Configuration object */
function Configuration() {
var port = chrome.extension.connect({name:"hint-helper"});
function LOG(message) {
//window.dump( "[Configuration] " + message + "\n");
}
this.newTab = false;
this.backgroundTab = false;
this.hover = false;
this.properClick = true;
this.nextOverlayId = 1;
this.getPreference = function (key) {
if ( key=="activationKeyCode" ) {
return 0x7B; //F12
}
else if ( key=="deactivationKeyCode" ) {
return 0x7B; //F12
}
else
return null;
};
/* returns a UNIQUE shortcut calculated using `ndx`
*
* @param ndx a non negative integer Number
* @return a unique (in terms of ndx) String
*/
this.generateShortcut = function (ndx) {
return ndx;
};
this.createLabel = function(element,shortcut) {
var overlay = getElementOverlay(element);
//var overlayId = "keynav.shortcut["+shortcut+"]";
// no overlay at all yet? create one
if (!overlay) {
LOG("creating a new empty, hidden overlay");
overlay = document.createElement("span");
var shortcutId = this.nextOverlayId ++;
var overlayId = "keynav.shortcut["+ shortcutId +"]";
overlay.style.position = "absolute";
overlay.style.background = "lightyellow";
overlay.style.fontSize = "small";
overlay.style.fontColor = "black";
overlay.style.border = "1px dashed darkgray";
overlay.style.fontColor = "black";
overlay.style.visibility = "hidden";
overlay.style.padding = "1px";
// overlay.style.top = "5px";
// overlay.style.left = "-10px";
//var rect = element.getBoundingClientRect(element);
// overlay.style.top = element.offsetTop;
// overlay.style.left = element.offsetLeft;
overlay.id = overlayId;
// insert as a sibling, because the element itself might not be able
// to have children (like a Button, for example)
if (element.localName.toLowerCase() == "td")
element.insertBefore(overlay,element.firstChild);
else
if (element.localName.toLowerCase() in { "tr":null, "th":null})
element.firstChild.insertBefore(overlay,element.firstChild.firstChild);
else
element.parentNode.insertBefore(overlay,element);
element.setAttribute( "keynav:shortcut", shortcutId );
}
overlay.innerHTML = "<font color=\"black\">" + shortcut + "</font>";
return overlay;
};
/** Returns the shortcut overlay of the specified element
*
* @param element
* @return
*/
function getElementOverlay(element) {
if ( element.hasAttribute("keynav:shortcut") ) {
var shortcutElementId = "keynav.shortcut[" +
element.getAttribute("keynav:shortcut") + "]";
var shortcutElement = document.getElementById(shortcutElementId);
return shortcutElement;
} else {
return null;
}
}
/** highlights (or dims) the element's shortcut.
*
* @param element the Element whose shortcut is to be highlighted/dimmed
* @param on a Boolean - true to highlight, false to dim.
*/
this.highlightShortcut = function (element,on) {
var overlay = getElementOverlay(element);
if (overlay) {
overlay.style.background = on ? "lightgreen" : "lightyellow";
overlay.style.border = on ? "1px solid black" : "1px dashed darkgray";
}
};
/** Selects the elements of the document to assign shortcuts to
*
* @return an array of Elements
*/
this.getClickableElements = function() {
var ems = new Array(0);
function addClickableElementsIn( parent ) {
for (var i=0; i<parent.childNodes.length; ++i) {
var node = parent.childNodes[i];
if (node.nodeType!=1) {
continue;
}
var clickable = node.nodeName.toLowerCase()=="input" |
node.nodeName.toLowerCase()=="select" |
node.nodeName.toLowerCase()=="textarea" |
node.hasAttribute("href") |
node.hasAttribute("onclick");
if ( clickable ) {
ems.push(node);
}
addClickableElementsIn(node);
}
}
addClickableElementsIn(document);
return ems;
};
/** Simulates a user-click on an element
*
* @param element the element that should be "clicked"
*/
this.simulateClick = function (element) {
if (this.hover) {
var me = element;
var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("mouseover", true, true, window, 0,
0, 0, 0, 0, false, false, false, false, 0, null);
me.parentElement.dispatchEvent(evt);
// while (me) {
// var evt = document.createEvent("MouseEvents");
// evt.initMouseEvent("mouseover", true, true, window, 0,
// 0, 0, 0, 0, false, false, false, false, 0, null);
// me.dispatchEvent(evt);
// me = me.parentElement;
// }
} else {
if ( element.nodeName.toLowerCase()=="input" ||
element.nodeName.toLowerCase()=="textarea" ) {
element.focus();
element.click();
}
else if ( element.nodeName.toLowerCase()=="select" ) {
element.focus();
}
else if (element.hasAttribute("onclick") || (this.properClick &!(this.newTab)))
{
// must come before checking "href" because links may have a
// pseudo "href" but a real "onclick"
var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("click", true, true, window, 0,
0, 0, 0, 0, false, false, false, false, 0, null);
element.dispatchEvent(evt);
}
else if (element.hasAttribute("href")) {
if (this.newTab) {
var href = element.href;
port.postMessage({newTabURL:href,background:this.backgroundTab});
} else {
window.location = element.getAttribute("href");
}
}
}
};
}
function KeyNav() {
function LOG(message) {
//window.dump( "[KeyNav] " + message + "\n");
}
/** displays information that most users will find useful
*
* @param message a String to display to the user
*/
var displayOverlay;
function display(message) {
if (!displayOverlay) {
displayOverlay = document.createElement("div");
displayOverlay.style.position = "fixed";
displayOverlay.style.display = "block";
displayOverlay.style.left = "40%";
displayOverlay.style.top = "40%";
displayOverlay.style.background = "lightgreen";
displayOverlay.style.border = "1px dashed black";
displayOverlay.style.padding = "2px";
displayOverlay.style.zorder = 500;
displayOverlay.style.opacity = 0.8;
displayOverlay.setAttribute("align","center");
document.getElementsByTagName("body")[0].appendChild( displayOverlay );
}
if (message=="") {
displayOverlay.style.visibility = "hidden";
} else {
displayOverlay.style.visibility = "visible";
displayOverlay.innerHTML = message;
}
}
var conf = new Configuration();
var bindings = new Map(); //maps Strings (shortcuts) to Elements
var acceptInput = false; //off by default
// last searched shortcut.
// the shortcut is searched incrementally
var lastShortcut = "";
/** highlights the overlays for the specified elements. Dims all other
* elements
*
* @param targets an Elements array whose overlays should be highlighted
*/
function highlightOverlays( targets ) {
//TODO use _labels instead of bindings.values()
// trivial implementation: dims all elements and highlights the
// specified ones
// dim all elements
var allTargets = bindings.values();
for (var i=0; i<allTargets.length; ++i) {
conf.highlightShortcut( allTargets[i], false );
}
// highlight specified elements
for (var j=0; j<targets.length; ++j) {
conf.highlightShortcut( targets[j], true );
}
}
var _labels = new Array(0);
var _labelsValid = false;
function invalidate() {
_labelsValid = false;
LOG("invalidated");
}
function isValid() {
return _labelsValid;
}
function createLabels() {
_labels = new Array(0);
bindings.clear();
var clickableElements = conf.getClickableElements();
for (var i=0; i<clickableElements.length; ++i) {
var element = clickableElements[i];
var shortcut = conf.generateShortcut(i);
var label = conf.createLabel(element,shortcut);
bindings.setValue( shortcut, element );
_labels.push( label );
}
_labelsValid = true;
LOG("labels are now valid");
}
function showLabels() {
for (var i=0; i<_labels.length; ++i) {
_labels[i].style.visibility = "visible";
}
}
function hideLabels() {
for (var i=0; i<_labels.length; ++i) {
_labels[i].style.visibility = "hidden";
}
}
/* toggles keyboard navigation on/off for the current document
*
* @param en a Boolean
*/
function toggle(en) {
if (en) {
conf.newTab = false;
conf.backgroundTab = false;
conf.hover = false;
conf.properClick = true;
// suspend the event handler until all labels are created (and
// inserted to the document)
document.removeEventListener("DOMNodeInserted",invalidate,true);
if (!isValid()) {
createLabels();
}
showLabels();
acceptInput = true;
display("Hints enabled. Press `H` for help. ");
// whenever the document changes, invalidate the labels
document.addEventListener("DOMNodeInserted",invalidate,true);
LOG("enabled");
}
else {
acceptInput = false;
hideLabels();
display("");
LOG("disabled");
}
}
function onKeyPress(evt) {
if (!acceptInput) return;
evt.preventDefault();
// append pressed character to the shortcut we are going to lookup
var ch = String.fromCharCode(evt.charCode).toLowerCase();
switch (ch) {
case 'g':
conf.newTab = !conf.newTab;
conf.backgroundTab = false;
display(conf.newTab? "Open in new foreground tab":"Open in this tab" );
return;
case 'm':
conf.hover = !conf.hover;
display(conf.hover?
"Simulate mouse hovering instead of a click":"Simulate a click" );
return;
case 'f':
conf.properClick = !conf.properClick;
display(conf.properClick?
"Simulate proper click on link":"Follow link" );
return;
case 'b':
conf.newTab = !conf.newTab;
conf.backgroundTab = true;
display(conf.newTab? "Open in new background tab":"Open in this tab" );
return;
case 'r':
invalidate();
return;
case 'h':
display("G - toggle target: new foreground tab / this tab<br>"
+ "B - toggle target: new background tab / this tab<br>"
+ "H - show this cheat sheet<br>");
return;
}
lastShortcut += ch;
// lookup targets starting with the shortcut
var targets = bindings.getValuesByPredicate( function(key){
if ( key.substring(0,lastShortcut.length)==lastShortcut )
return true;
else
return false;
} );
highlightOverlays( targets );
if ( targets.length==0 ) {
// no targets at all - start a new search next time
display("");
LOG(lastShortcut + " is unbound. clearing");
lastShortcut = "";
}
else if ( targets.length==1 ) {
// exactly one match - navigate to target, and start a new search
// next time
display("");
lastShortcut = "";
LOG(lastShortcut + " bound to 1 target. clearing. navigating");
toggle(false);
if (targets[0]) {
conf.simulateClick(targets[0]);
}
else {
LOG("no target for sequence: " + lastShortcut);
}
}
else {
// more than one match - do nothing. next search will be appended
display("Keep typing.. " + targets.length +
" elements match so far<br>(or press Enter to \"click\" " +
lastShortcut + ")");
LOG(lastShortcut + " bound to " + targets.length + " targets");
}
}
function onKeyDown(evt) {
// activation
if (evt.keyCode==0x47 && evt.altKey)
if (acceptInput) {
toggle(false);
evt.preventDefault();
return;
} else {
//document.activeElement.blur();
evt.preventDefault();
toggle(true);
}
if (!acceptInput & evt.keyCode==conf.getPreference("activationKeyCode")) {
evt.preventDefault();
toggle(true);
}
else if (acceptInput & evt.keyCode==conf.getPreference("deactivationKeyCode")) {
evt.preventDefault();
toggle(false);
return;
}
if (!acceptInput) return;
switch (evt.keyCode) {
//case KeyEvent.DOM_VK_RETURN:
case 0x0D: //KeyEvent.DOM_VK_ENTER:
// match the exact shortcut typed so far
var target = bindings.getValue(lastShortcut);
LOG("match for exact shortcut " + lastShortcut + ": " + target);
if (target) {
toggle(false);
conf.simulateClick(target);
}
evt.preventDefault();
lastShortcut = "";
break;
}
}
function installEventListeners() {
window.addEventListener("keydown",onKeyDown,true);
window.addEventListener("keypress",onKeyPress,true);
}
createLabels();
installEventListeners();
}
var keynav = new KeyNav(); |
Wellicht dat 47 Java-taal staat voor G, dit heb ik veranderd in 46, en met ALT + F getest om te kijken of het enig effect zou sorteren. Geen resultaat.
Wellicht dat dit
de ALT+G key was. Heb vervolgens gekeken naar de HEX-waarde van de ALT key. Hier staat een waslijst met toetsenbord karakters met hun hex values. Bij Del (Delete) staat bij de hex waarde 53, dus zou ik in dat stukje script de 0x7B moeten veranderen in 0x53 (denk ik).if ( key=="activationKeyCode" ) {
return 0x7B; //F12
Wanneer ik beide 7B codes vervang door 0x53, vervolgens Chrome opnieuw starten.. geen resultaat met DEL. Wel dat ALT + G nog werkt.. met als nieuw effect dat de letter S de extensie ook activeert
S blijkt in principe óók hex 53 te zijn.
Twiekers die weten waar Alt + G in de code verschuild staat