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How to fix mistakes caused by wrong keyboard layout in text field

I have an app which is mostly about studying a new language. In my application there is an input field which expects text in a language that user study.
So if user focuses on that input, ideally, I want automatically to switch a layout to a target language. To make user experience more enjoyable (you don't need to worry about a wrong layout).
What I know and have tried
As I know browsers not able to provide API which I can use to determine a current layout.
I have tried to detect if the last entered character is not a typical character for the target language then I use my mapping between key codes and target language letters and replace that entered character in particular position in input. After that I get caret reset. So I return it to previous position.
The problem with the second approach that if you type fast enough you can encounter problems with a caret position. And it leads to a wrong string in the input.
Do you have any ideas how to achieve that behavior which works even when you type text with a speed when you almost immediately press two keys at the same time?
P.S. Code for that described approach
const codeToEn = {
65: 'a',
// ... and so on
}
const acceptableChars = /^[a-zA-Z0-9 .+_)(%#!?,&$*'"`~]+$/g;
document.getElementById('some-input-id').addEventListener('keyup', function (e) {
if (codeToEn[e.which]
&& !acceptableChars.test(this.value)) {
const char = codeToEn[e.which];
const {selectionStart, selectionEnd} = this;
const currentVal = this.value;
let leftPart = currentVal.substring(0, selectionStart - 1);
let rightPart = currentVal.substring(selectionStart );
this.value = leftPart + char + rightPart;
this.setSelectionRange(selectionStart, selectionEnd);
}
});

Convert Layout will help you:
https://github.com/ai/convert-layout
It really small and supports many languages.

Before you look into the code below, please note that my solution assumes that all the users use QWERTY / ЙЦУКЕН keyboard layout. This may be a huge simplification and you'll have to find a more complex approach to the keyboard layout detection (generally it's all about finding a correct symbols mapping).
The more useful part here is a fast substitution of symbols. So type fast or even copy-paste text. Hope it helps!
const En = "qwertyuiop[]asdfghjkl;'zxcvbnm,.",
Ru = "йцукенгшщзхъфывапролджэячсмитьбю";
const RuEn = [...Ru].reduce((a, e, i) => (a[e] = En[i]) && (a[e.toUpperCase()] = En[i].toUpperCase()) && a, {});
let corrected = 0;
document.getElementById('ta').addEventListener('input', function() {
let end = this.selectionEnd;
for (let i = !!corrected * (this.value.length - corrected - 1); i < end; i++) {
let s = RuEn[this.value[i]];
if (s) this.value = this.value.split(this.value[i]).join(s);
}
this.selectionEnd = end;
corrected = this.value.length - 1;
});
<textarea id="ta" cols="50" rows="10"></textarea>

how to remove the last character of an input field using AngularJS

The title of this question is probably wrong, but i can't think of how to name it.
I'm trying to build a simple calculator using AngularJS. Right now its functioning, but i'm trying to add some other buttons. I want a "delete" key and a decimal key. The delete key is what i'm focused on now.
If someone clicks, 3, then 3 again. we have 33. (this calculator currently, can only accept a left and right operand, and an operator separating them (ex, 3+3, or 56*486, etc). not multiple operators or operands). Now say the user were to enter 334, but they want the 4 taken off because they meant to click 5. How do I use javascript to delete the most recent number if an operator or equals hasn't been pressed?
If i had to guess, it's going to be something like this:
$scope.deleteNumb = function(d){
if(!$scope.operator){
// if no operator, delete most recent left operand
}
else{ //delete most recent right operand}
}
};
The "C" button doesn't work. I had that set up as "Clear" which refreshed the page to start a new calculation. I need a way to figure out how to delete the existing answer without using location.reload();
So the main thing here, is trying to delete the recent most operand, whether it be left or right, depending if an operator has been clicked or not.
My code is here:
https://codepen.io/tevon/pen/Moewba

For clear (C) did you try to clear all values in setClear
$scope.setClear = function (a) {
$scope.leftOperand = "";
$scope.operator = "";
$scope.rightOperand = "";
$scope.answer = "";
};

to delete a part of your number; have a look to substr as your input is a string :
For exemple :
$scope.removeBtn = function(){
var tmp = $scope.leftOperand;
console.warn("test",tmp)
$scope.leftOperand = tmp.substr(0,tmp.length-1);
}
This function removes the last number of your leftOperand.
Adapt it to your need for left/right

$scope.setClear = function (a) {
// $scope.clear = location.reload();
var result = $scope.leftOperand + $scope.operator + $scope.rightOperand;
result = result.substring(0, result.length - 1);
if ($scope.operator){
$scope.rightOperand = result;
}
else {
$scope.leftOperand = result;
}
};
Not tested.. Would have to tweak a little when operators come i guess

Unable to Get Output From While Loop in Javascript

I'm working on my final project of the Winter 2017 quarter to demonstrate how to use Regular Expressions in both C# and JavaScript code behind pages. I've got the C# version of my demonstration program done, but the JavaScript version is making me pull what little hair I have left on my head out (no small achievement since I got a fresh buzz cut this morning!). The problem involves not getting any output after applying a Regular Expression in a While loop to get each instance of the expression and printing it out.
On my HTML page I have an input textarea, seven radio buttons, an output textarea, and two buttons underneath (one button is to move the output text to the input area to perform multiple iterations of applying expressions, and the other button to clear all textareas for starting from scratch). Each radio button links to a function that applies a regular expression to the text in the input area. Five of my seven functions work; the sixth is the one I can't figure out, and the seventh is essentially the same but with a slightly different RegEx pattern, so if I fix the sixth function, the seventh function will be a snap.
(I tried to insert/upload a JPG of the front end, but the photo upload doesn't seem to be working. Hopefully you get the drift of what I've set up.)
Here are my problem children from my JS code behind:
// RegEx_Demo_JS.js - code behind for RegEx_Demo_JS
var inputString; // Global variable for the input from the input text box.
var pattern; // Global variable for the regular expression.
var result; // Global variable for the result of applying the regular expression to the user input.
// Initializes a new instance of the StringBuilder class
// and appends the given value if supplied
function StringBuilder()
{
var strings = [];
this.append = function (string)
{
string = verify(string);
if (string.length > 0) strings[strings.length] = string;
}
this.appendLine = function (string)
{
string = verify(string);
if (this.isEmpty())
{
if (string.length > 0) strings[strings.length] = string;
else return;
}
else strings[strings.length] = string.length > 0 ? "\r\n" + string : "\r\n";
}
this.clear = function () { strings = []; };
this.isEmpty = function () { return strings.length == 0; };
this.toString = function () { return strings.join(""); };
var verify = function (string)
{
if (!defined(string)) return "";
if (getType(string) != getType(new String())) return String(string);
return string;
}
var defined = function (el)
{
// Changed per Ryan O'Hara's comment:
return el != null && typeof(el) != "undefined";
}
var getType = function (instance)
{
if (!defined(instance.constructor)) throw Error("Unexpected object type");
var type = String(instance.constructor).match(/function\s+(\w+)/);
return defined(type) ? type[1] : "undefined";
}
}
Within the code of the second radio button (which will be the seventh and last function to complete), I tested the ScriptBuilder with data in a local variable, and it ran successfully and produced output into the output textarea. But I get no output from this next function that invokes a While loop:
function RegEx_Match_TheOnly_AllInstances()
{
inputString = document.getElementById("txtUserInput").value;
pattern = /(\s+the\s+)/ig; // Using an Flag (/i) to select either lowercase or uppercase version. Finds first occurrence either as a standalone word or inside a word.
//result = pattern.exec(inputString); // Finds the first index location
var arrResult; // Array for the results of the search.
var sb = getStringBuilder(); // Variable to hold iterations of the result and the text
while ((arrResult = pattern.exec(inputString)) !==null)
{
sb.appendLine = "Match: " + arrResult[0] ;
}
document.getElementById("txtRegExOutput").value = sb.toString();
/* Original code from C# version:
// string pattern = #"\s+(?i)the\s+"; // Same as above, but using Option construct for case insensitive search.
string pattern = #"(^|\s+)(?i)the(\W|\s+)";
MatchCollection matches = Regex.Matches(userTextInput, pattern);
StringBuilder outputString = new StringBuilder();
foreach (Match match in matches)
{
string outputRegExs = "Match: " + "\"" + match.Value + "\"" + " at index [" + match.Index + ","
+ (match.Index + match.Length) + "]" + "\n";
outputString.Append(outputRegExs);
}
txtRegExOutput.Text = outputString.ToString();
*/
} // End RegEx_Match_The_AllInstances
I left the commented code in to show what I had used in the C# code behind version to illustrate what I'm trying to accomplish.
The test input/string I used for this function is:
Don’t go there. If you want to be the Man, you have to beat The Man.
That should return two hits. Ideally, I want it to show the word that it found and the index where it found the word, but at this point I'd be happy to just get some output showing every instance it found, and then build on that with the index and possibly the lastIndex.
So, is my problem in my While loop, the way I'm applying the StringBuilder, or a combination of the two? I know the StringBuilder code works, at least when not being used in a loop and using some test data from the site I found that code. And the code for simply finding the first instance of "the" as a standalone or inside another word does work and returns output, but that doesn't use a loop.
I've looked through Stack Overflow and several other JavaScript websites for inspiration, but nothing I've tried so far has worked. I appreciate any help anyone can provide! (If you need me to post any other code, please advise and I'll be happy to oblige.)

Is it possible to highlight all words on a web page without destroying the layout?

I've written an extension for firefox which highlights all words on a web page (excluding some words in a given list).
What i've noticed is that (besides that my extension is terribly slow) some web pages get "destroyed", more specifically the layout gets destroyed (particularly websites with overlay advertising or fancy drop-down menus).
My code wraps <span> tags around every "word", or to be precise around every token, because i'm splitting the text nodes with a whitespace as seperator.
So is it possible anyway to realize this task without destroying the page's layout?
I'm iterating over all text nodes, split them, and iterate over every token.
When the token is in my list, i don't highlight it, else i wrap the <span> tag around it.
So any suggestions how this could be done faster would be helpful, too.
Here are some screenshots for a correctly highlighted and a not correctly highlighted web page:
right:
en.wikipedia.org before highlighting,
en.wikipedia.org after highlighting.
wrong:
developer.mozilla.org before highlighting,
developer.mozilla.org after highlighting.

OK. Study this code. It searches for all instances of "is" and highlights if it is not surrounded by word characters. Put this in your scratchpad while this tab is focused. You will see that words like "List" and other words containing "Is" are no highlighted, but all the "Is"'s are.
I basically made an addon here for you. You can now release this as an addon called RegEx FindBar and take all the credit....
var doc = gBrowser.contentDocument;
var ctrler = _getSelectionController(doc.defaultView);
var searchRange = doc.createRange();
searchRange.selectNodeContents(doc.documentElement);
let startPt = searchRange.cloneRange();
startPt.collapse(true);
let endPt = searchRange.cloneRange();
endPt.collapse(false);
let retRane = null;
let finder = Cc["#mozilla.org/embedcomp/rangefind;1"].createInstance().QueryInterface(Ci.nsIFind);
finder.caseSensitive = false;
var i = 0;
while (retRange = finder.Find('is', searchRange, startPt, endPt)) {
i++;
var stCont = retRange.startContainer;
var endCont = retRange.endContainer;
console.log('retRange(' + i + ') = ', retRange);
console.log('var txt = retRange.commonAncestorContainer.data',retRange.commonAncestorContainer.data);
//now test if one posiion before startOffset and one position after endOffset are WORD characters
var isOneCharBeforeStCharWordChar; //var that holds if the character before the start character is a word character
if (retRange.startOffset == 0) {
//no characters befor this characte so obviously not a word char
isOneCharBeforeStCharWordChar = false;
} else {
var oneCharBeforeStChar = stCont.data.substr(retRange.startOffset-1,1);
if (/\w/.test(oneCharBeforeStChar)) {
isOneCharBeforeStCharWordChar = true;
} else {
isOneCharBeforeStCharWordChar = false;
}
console.log('oneCharBeforeStChar',oneCharBeforeStChar);
}
var isOneCharAfterEndCharWordChar; //var that holds if the character before the start character is a word character
if (retRange.endOffset == endCont.length - 1) {
//no characters after this characte so obviously not a word char
isOneCharAfterEndCharWordChar = false;
} else {
var oneCharAferEndChar = endCont.data.substr(retRange.endOffset,1); //no need to subtract 1 from endOffset, it takes into account substr 2nd arg is length and is treated like length I THINK
if (/\w/.test(oneCharAferEndChar)) {
isOneCharAfterEndCharWordChar = true;
} else {
isOneCharAfterEndCharWordChar = false;
}
console.log('oneCharAferEndChar',oneCharAferEndChar);
}
if (isOneCharBeforeStCharWordChar == false && isOneCharAfterEndCharWordChar == false) {
//highlight it as surrounding characters are no word characters
_highlightRange(retRange, ctrler);
console.log('highlighted it as it was not surrounded by word charactes');
} else {
console.log('NOT hilte it as it was not surrounded by word charactes');
}
//break;
startPt = retRange.cloneRange();
startPt.collapse(false);
}
/*********************/
function _getEditableNode(aNode) {
while (aNode) {
if (aNode instanceof Ci.nsIDOMNSEditableElement)
return aNode.editor ? aNode : null;
aNode = aNode.parentNode;
}
return null;
}
function _highlightRange(aRange, aController) {
let node = aRange.startContainer;
let controller = aController;
let editableNode = this._getEditableNode(node);
if (editableNode)
controller = editableNode.editor.selectionController;
let findSelection = controller.getSelection(Ci.nsISelectionController.SELECTION_FIND);
findSelection.addRange(aRange);
if (editableNode) {
// Highlighting added, so cache this editor, and hook up listeners
// to ensure we deal properly with edits within the highlighting
if (!this._editors) {
this._editors = [];
this._stateListeners = [];
}
let existingIndex = this._editors.indexOf(editableNode.editor);
if (existingIndex == -1) {
let x = this._editors.length;
this._editors[x] = editableNode.editor;
this._stateListeners[x] = this._createStateListener();
this._editors[x].addEditActionListener(this);
this._editors[x].addDocumentStateListener(this._stateListeners[x]);
}
}
}
function _getSelectionController(aWindow) {
// display: none iframes don't have a selection controller, see bug 493658
if (!aWindow.innerWidth || !aWindow.innerHeight)
return null;
// Yuck. See bug 138068.
let docShell = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation)
.QueryInterface(Ci.nsIDocShell);
let controller = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsISelectionDisplay)
.QueryInterface(Ci.nsISelectionController);
return controller;
}

Oh edit my solution out, will update with proper solution, I see you want to highlight all words
This is the code how firefox highlights stuff without changing document: Finder.jsm - _highlight function. You will have to copy this and use it for the whole document, if you need help let me know and I'll do it.
Here was my solution to highlight all matches of single word: https://stackoverflow.com/a/22206366/1828637
Here man this is how you are going to highlight the whole document, I didn't finish the snippet but this is the start of it: Gist - HighlightTextInDocument

Here's the copy paste answer to highlight everything in the document. As you learn more about it share with us, like how you can highlight with a different color, right now its all pink O_O
function _getEditableNode(aNode) {
while (aNode) {
if (aNode instanceof Ci.nsIDOMNSEditableElement)
return aNode.editor ? aNode : null;
aNode = aNode.parentNode;
}
return null;
}
function _highlightRange(aRange, aController) {
let node = aRange.startContainer;
let controller = aController;
let editableNode = this._getEditableNode(node);
if (editableNode)
controller = editableNode.editor.selectionController;
let findSelection = controller.getSelection(Ci.nsISelectionController.SELECTION_FIND);
findSelection.addRange(aRange);
if (editableNode) {
// Highlighting added, so cache this editor, and hook up listeners
// to ensure we deal properly with edits within the highlighting
if (!this._editors) {
this._editors = [];
this._stateListeners = [];
}
let existingIndex = this._editors.indexOf(editableNode.editor);
if (existingIndex == -1) {
let x = this._editors.length;
this._editors[x] = editableNode.editor;
this._stateListeners[x] = this._createStateListener();
this._editors[x].addEditActionListener(this);
this._editors[x].addDocumentStateListener(this._stateListeners[x]);
}
}
}
function _getSelectionController(aWindow) {
// display: none iframes don't have a selection controller, see bug 493658
if (!aWindow.innerWidth || !aWindow.innerHeight)
return null;
// Yuck. See bug 138068.
let docShell = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebNavigation)
.QueryInterface(Ci.nsIDocShell);
let controller = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsISelectionDisplay)
.QueryInterface(Ci.nsISelectionController);
return controller;
}
var doc = gBrowser.contentDocument;
var searchRange = doc.createRange();
searchRange.selectNodeContents(doc.documentElement);
_highlightRange(searchRange,_getSelectionController(gBrowser.contentWindow))

#jervis, I can't make a comment on your comment under #Noitidart code as I don't have 50rep yet. So I have to post here.
Re:
I did it with 'gFindBar._highlightDoc(true, word)' now. I'm using firefox 17, so i dont know if gFindBar is state of the art. – jervis 40 mins ago
But I tested his code and and it works.
Don't use gFindBar.
Copy it and then paste it into your Scratchpad.
Why are you using gFindBar._highlightDoc(true, word) ? I thoght you wanted to highlight everything in the document? Where did you get _highlightDoc from? I don't see that anywhere in #Noitidart's code.
Regading yoru comment on iterate all words and use gFindBar._highlightDoc:
I did it with 'gFindBar._highlightDoc(true, word)' now. I'm using firefox 17, so i dont know if gFindBar is state of the art. – jervis 39 mins ago
Dude why do that.... I saw #Noitidart posted a per word solution on the linked topic: gBrowser.tabContainer.childNodes[0].linkedBrowser.finder.highlight(true, 'YOUR_WORD_HERE'); that is extremely easy, one line and no need to create text nodes spans or anything. You have to run this code on each tab you want to highlight in.

Masked Edit two code formats for a single input text box

I have two masks G999-9 and H99-9 which stand for graduates and honor which both need to be entered for a single input text html control.
While first typing, if it hits a G I would like it to show the format for the Graduate format, and for the Honors, I would like it to show the format for the Honors format while typing it out. Is there a simple way to do this in javascript or jQuery?
Examples:
G111-1
H91-5
G001-3
G___-_ (If you hit G it should show the Graduate format)
H__-_ (If you hit H it should show the Honors format.)
____-_ (Type anything else, or nothing do this.)
Thanks,
Marc

Regex Based Demo
Yay! regex! Yes, like every other (non-HTML) parsing questions there's a regex for that. :)
$("input").keyup(function(e){
if(e.keyCode > 40 || e.keyCode < 37)
{
var validInput = $(this).val().match(/(([G])(([0-9]{3}[-]([0-9]{0,1})?|[0-9]{0,3})?)?|([H])(([0-9]{2}[-]([0-9]{0,1})?|[0-9]{0,2})?)?)/);
$(this).val(validInput?validInput[0]:"")
}
});
It's a bit convoluted (help in optimizing it would be much appreciated), but it works.

Simple way? You're either going to have to walk the string or use some fancy regex.
Normally, we'd use regexes for this, but with the assumption that you don't know so much about regexes (perhaps a bad assumption, but most people that can read them will gravitate towards them first) and in the hopes of keeping you following what is happening, I wrote it more procedurally:
<input type="text" class="formatted" />
$(document).ready(function(){
function applyMask(instr){
var pOut = [], delimitter = '-', format = 0, pSplit = 4, pMax = 6;
// There are a lot of ways to express this. I just chose one that should
// be understandable.
if ((instr.length > 0) && (instr[0].toUpperCase() == 'H'))
{
pSplit = 3;
pMax = 5;
}
pMax = Math.min(pMax, instr.length);
for (var i=0; i < pMax; i++)
{
if ((i==pSplit) && (instr[i] != delimitter))
{
pOut.push(delimitter);
}
else
{
pOut.push(instr[i]);
}
}
return pOut.join('');
}
$('.formatted').keyup(function(){
$(this).val(applyMask($(this).val()).toUpperCase());
});
});
Here's a fiddle, even: http://jsfiddle.net/UdcND/

There are some jQuery plugins for easily converting a text input to a mask edit:
a simple but useful plugin: http://www.pengoworks.com/workshop/js/mask/
another good option: http://digitalbush.com/projects/masked-input-plugin/