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Javascript - How to simplify a range of characters for conversion

I am editing a code from here to make an alphabet convert into another set alphabet, in other words, my intention is to make an online textarea keyboard for a foreign alphabet.
This is my code which I have edited from above:
<textarea id="txt"></textarea>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$('#txt').on('keypress', function (e) {
var pressedKey = String.fromCharCode(e.keyCode);
var $txt = $('#txt');
e.preventDefault();
if(pressedKey == 'q') {$txt.val($txt.val() + 'ф');}
if(pressedKey == 'w') {$txt.val($txt.val() + 'ц');}
if(pressedKey == 'e') {$txt.val($txt.val() + 'у');}
if(pressedKey == '') {$txt.val($txt.val() + '');} .......
});
</script>
For every latin alphabet there is one cyrillic alphabet. Considering there are uppercase letters and punctuation marks as well, there are certainly a lot of 'if(pressedKey == '') {$txt.val($txt.val() + '');}'s to make.
How can I simplify this code, instead of making more than 50 rows of almost the same line?
I have referred to many sources and have tried many approaches with my short knowledge, I also tried to include var into my Javascript as many sources recommended doing so, but cannot think of a good way. Any help will be greatly appreciated.

Use a object and use the pressedKey as key, like:
const characters = {
'q': 'ф'
}
const newCharacter = characters[pressedKey] || '?'
$txt.val($txt.val() + newCharacter);
Or even less, but you lose a bit of meaning:
$txt.val($txt.val() + ({ 'q': 'ф' })[pressedKey])

Search that highlights text is having problems with special characters

I took this code from a blog which I don't remember the URL. The code is supposed to find in a list with many sections the text written by the user in an input field. If there is a match, the text will be highlighted; and if there is no match, the whole section will hide.
I've made a plunker so you can see how it works: Here's the link
This is the JS code:
$(document).ready(function() {
var $container = $('#global_div');
if (!$container.length) return true;
var $input = $('#searcher'),
$notfound = $('.not-found'),
$items = $container.find('.row'),
$item = $(),
itemsIndexed = [];
$items.each(function() {
itemsIndexed.push($(this).text().replace(/\s{2,}/g, ' ').toLowerCase());
});
$input.on('keyup', function(e) {
$items.each(function() {
$item = $(this);
$item.html($item.html().replace(/<span class="highlight">([^<]+)<\/span>/gi, '$1'));
});
var searchVal = $.trim($input.val()).toLowerCase();
if (searchVal.length) {
for (var i in itemsIndexed) {
$item = $items.eq(i);
if (itemsIndexed[i].indexOf(searchVal) != -1)
$item.removeClass('is-hidden').html($item.html().replace(new RegExp(searchVal + '(?!([^<]+)?>)', 'gi'), '<span class="highlight">$&</span>'));
else
$item.addClass('is-hidden');
}
} else $items.removeClass('is-hidden');
$notfound.toggleClass('is-visible', $items.not('.is-hidden').length == 0);
});
});
So far so good, but the problem is when there are certain characters in the html text or when writing some special characters in the input field. Please open the plunker so you can do the tests I'm about to tell you:
When writing down the letters "a", "s" or "n", you can see how it shows the &amp ; and &nbsp ; of the html. Also when writing down "&", and the whole thing breaks when writing a "." (point).
As I couldn't fix this, I added this code to avoid people from writing special characters in the input (this code isn't in the plunker, so you can test the errors):
$("#searcher").keypress(function(event) {
var character = String.fromCharCode(event.keyCode);
return isValid(character);
});
function isValid(str) {
return !/[~`!##$%\^&*()+=\-\[\]\\';/{}|\\":.<>\?]/g.test(str);
}
But there is still the problem when there are characters like &amp ; and &nbsp ; in the html and users write in the input field the letter "a", "s" or "n" ..or depending which other weird character be on the html.

How to Prevent Spaces to Be Counted as Characters?

I've got a search box and works quite good actually. What it does is that you type something and if it already exists, it shows you the topic. If not, it sends you to page that you can open this topic. When you type "ABC" or "A BC", it's okay but when you try to type "AB" and then try to search, it gives you an error that you need to type at least 3 characters, which is good. But it can be easily done like ("a space space" - counts 3). You may open topics with spaces, sure, but don't want that spaces to be counted. Such as, (hello world) It should be counted as 10 characters, not 11. How to exclude spaces to be counted as characters? It's a project I'm working on to make it better, I have not written all by myself.
Here are my search box's all javascript files which I probably need to edit but don't know how:
<script type="text/javascript">
function formatText(tag) {
var Field = document.getElementById('entry_girdi');
var val = Field.value;
var selected_txt = val.substring(Field.selectionStart, Field.selectionEnd);
var before_txt = val.substring(0, Field.selectionStart);
var after_txt = val.substring(Field.selectionEnd, val.length);
Field.value += '[' + tag + '/]';
}
</script>
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b,d,f;c.bindAll(this),this.$node=e(a.input),this.datasets=a.datasets,this.dir=null,this.eventBus=a.eventBus,b=this.$node.find(".tt-dropdown-menu"),d=this.$node.find(".tt-query"),f=this.$node.find(".tt-hint"),this.dropdownView=new k({menu:b}).on("suggestionSelected",this._handleSelection).on("cursorMoved",this._clearHint).on("cursorMoved",this._setInputValueToSuggestionUnderCursor).on("cursorRemoved",this._setInputValueToQuery).on("cursorRemoved",this._updateHint).on("suggestionsRendered",this._updateHint).on("opened",this._updateHint).on("closed",this._clearHint).on("opened closed",this._propagateEvent),this.inputView=new j({input:d,hint:f}).on("focused",this._openDropdown).on("blured",this._closeDropdown).on("blured",this._setInputValueToQuery).on("enterKeyed tabKeyed",this._handleSelection).on("queryChanged",this._clearHint).on("queryChanged",this._clearSuggestions).on("queryChanged",this._getSuggestions).on("whitespaceChanged",this._updateHint).on("queryChanged whitespaceChanged",this._openDropdown).on("queryChanged whitespaceChanged",this._setLanguageDirection).on("escKeyed",this._closeDropdown).on("escKeyed",this._setInputValueToQuery).on("tabKeyed upKeyed downKeyed",this._managePreventDefault).on("upKeyed downKeyed",this._moveDropdownCursor).on("upKeyed downKeyed",this._openDropdown).on("tabKeyed leftKeyed rightKeyed",this._autocomplete)}function e(b){var c=a(g.wrapper),d=a(g.dropdown),e=a(b),f=a(g.hint);c=c.css(h.wrapper),d=d.css(h.dropdown),f.css(h.hint).css({backgroundAttachment:e.css("background-attachment"),backgroundClip:e.css("background-clip"),backgroundColor:e.css("background-color"),backgroundImage:e.css("background-image"),backgroundOrigin:e.css("background-origin"),backgroundPosition:e.css("background-position"),backgroundRepeat:e.css("background-repeat"),backgroundSize:e.css("background-size")}),e.data("ttAttrs",{dir:e.attr("dir"),autocomplete:e.attr("autocomplete"),spellcheck:e.attr("spellcheck"),style:e.attr("style")}),e.addClass("tt-query").attr({autocomplete:"off",spellcheck:!1}).css(h.query);try{!e.attr("dir")&&e.attr("dir","auto")}catch(i){}return e.wrap(c).parent().prepend(f).append(d)}function f(a){var b=a.find(".tt-query");c.each(b.data("ttAttrs"),function(a,d){c.isUndefined(d)?b.removeAttr(a):b.attr(a,d)}),b.detach().removeData("ttAttrs").removeClass("tt-query").insertAfter(a),a.remove()}var g={wrapper:'<span class="twitter-typeahead"></span>',hint:'<input class="tt-hint" type="text" autocomplete="off" spellcheck="off" disabled>',dropdown:'<span class="tt-dropdown-menu"></span>'},h={wrapper:{position:"relative",display:"inline-block"},hint:{position:"absolute",top:"0",left:"0",borderColor:"transparent",boxShadow:"none"},query:{position:"relative",verticalAlign:"to1p",backgroundColor:"transparent"},dropdown:{position:"absolute",top:"100%",left:"0",zIndex:"100",display:"none"}};return c.isMsie()&&c.mixin(h.query,{backgroundImage:"url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)"}),c.isMsie()&&c.isMsie()<=7&&(c.mixin(h.wrapper,{display:"inline",zoom:"1"}),c.mixin(h.query,{marginTop:"-1px"})),c.mixin(b.prototype,d,{_managePreventDefault:function(a){var b,c,d=a.data,e=!1;switch(a.type){case"tabKeyed":b=this.inputView.getHintValue(),c=this.inputView.getInputValue(),e=b&&b!==c;break;case"upKeyed":case"downKeyed":e=!d.shiftKey&&!d.ctrlKey&&!d.metaKey}e&&d.preventDefault()},_setLanguageDirection:function(){var a=this.inputView.getLanguageDirection();a!==this.dir&&(this.dir=a,this.$node.css("direction",a),this.dropdownView.setLanguageDirection(a))},_updateHint:function(){var a,b,d,e,f,g=this.dropdownView.getFirstSuggestion(),h=g?g.value:null,i=this.dropdownView.isVisible(),j=this.inputView.isOverflow();h&&i&&!j&&(a=this.inputView.getInputValue(),b=a.replace(/\s{2,}/g," ").replace(/^\s+/g,""),d=c.escapeRegExChars(b),e=new RegExp("^(?:"+d+")(.*$)","i"),f=e.exec(h),this.inputView.setHintValue(a+(f?f[1]:"")))},_clearHint:function(){this.inputView.setHintValue("")},_clearSuggestions:function(){this.dropdownView.clearSuggestions()},_setInputValueToQuery:function(){this.inputView.setInputValue(this.inputView.getQuery())},_setInputValueToSuggestionUnderCursor:function(a){var b=a.data;this.inputView.setInputValue(b.value,!0)},_openDropdown:function(){this.dropdownView.open()},_closeDropdown:function(a){this.dropdownView["blured"===a.type?"closeUnlessMouseIsOverDropdown":"close"]()},_moveDropdownCursor:function(a){var b=a.data;b.shiftKey||b.ctrlKey||b.metaKey||this.dropdownView["upKeyed"===a.type?"moveCursorUp":"moveCursorDown"]()},_handleSelection:function(a){var b="suggestionSelected"===a.type,d=b?a.data:this.dropdownView.getSuggestionUnderCursor();d&&(this.inputView.setInputValue(d.value),b?this.inputView.focus():a.data.preventDefault(),b&&c.isMsie()?c.defer(this.dropdownView.close):this.dropdownView.close(),this.eventBus.trigger("selected",d.datum,d.dataset))},_getSuggestions:function(){var a=this,b=this.inputView.getQuery();c.isBlankString(b)||c.each(this.datasets,function(c,d){d.getSuggestions(b,function(c){b===a.inputView.getQuery()&&a.dropdownView.renderSuggestions(d,c)})})},_autocomplete:function(a){var b,c,d,e,f;("rightKeyed"!==a.type&&"leftKeyed"!==a.type||(b=this.inputView.isCursorAtEnd(),c="ltr"===this.inputView.getLanguageDirection()?"leftKeyed"===a.type:"rightKeyed"===a.type,b&&!c))&&(d=this.inputView.getQuery(),e=this.inputView.getHintValue(),""!==e&&d!==e&&(f=this.dropdownView.getFirstSuggestion(),this.inputView.setInputValue(f.value),this.eventBus.trigger("autocompleted",f.datum,f.dataset)))},_propagateEvent:function(a){this.eventBus.trigger(a.type)},destroy:function(){this.inputView.destroy(),this.dropdownView.destroy(),f(this.$node),this.$node=null},setQuery:function(a){this.inputView.setQuery(a),this.inputView.setInputValue(a),this._clearHint(),this._clearSuggestions(),this._getSuggestions()}}),b}();!function(){var b,d={},f="ttView";b={initialize:function(b){function g(){var b,d=a(this),g=new e({el:d});b=c.map(h,function(a){return a.initialize()}),d.data(f,new l({input:d,eventBus:g=new e({el:d}),datasets:h})),a.when.apply(a,b).always(function(){c.defer(function(){g.trigger("initialized")})})}var h;return b=c.isArray(b)?b:[b],0===b.length&&a.error("no datasets provided"),h=c.map(b,function(a){var b=d[a.name]?d[a.name]:new i(a);return a.name&&(d[a.name]=b),b}),this.each(g)},destroy:function(){function b(){var b=a(this),c=b.data(f);c&&(c.destroy(),b.removeData(f))}return this.each(b)},setQuery:function(b){function c(){var c=a(this).data(f);c&&c.setQuery(b)}return this.each(c)}},jQuery.fn.typeahead=function(a){return b[a]?b[a].apply(this,[].slice.call(arguments,1)):b.initialize.apply(this,arguments)}}()}(window.jQuery);
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="/typeahead.min.js"></script>
<script>
$(document).ready(function(){
$('input.typeahead').typeahead({
name: 'typeahead',
remote:'/search.php?key=%QUERY',
limit : 10
});
});
</script>
<script type="text/javascript">
$(document).ready(function () {
//Disable part of page
$('input#ara').bind('cut copy paste', function (e) {
e.preventDefault();
});
});
</script>
<script type="text/javascript">
function numbersonly(myfield, e, dec) {
var key;
var keychar;
if (window.event)
key = window.event.keyCode;
else if (e)
key = e.which;
else
return true;
keychar = String.fromCharCode(key);
// control keys
if ((key == null) || (key == 0) || (key == 8) ||
(key == 9) || (key == 13) || (key == 27))
return true;
// numbers
else if ((("ABCÇDEFGĞHIİJKLMNOÖPQRSŞTUÜVWXYZabcçdefgğhıijklmnoöpqrsştuüvwxyz0123456789").indexOf(keychar) > -1))
return true;
// decimal point jump
else if (dec && (keychar == ".")) {
myfield.form.elements[dec].focus();
return false;
}
else
return false;
}
</script>
My another topic has been marked as duplicate but to be honest, I don't really know how to adapt these suggested lines to my js codes to get it working properly.
var myString = getElementById("input").value;
var withoutSpace = myString.replace(/ /g,"");
var length = withoutSpace.length;

You just take the value, in your case val, and strip out the spaces.
Change this line:
var val = Field.value;
To:
var val = Field.value.replace(/\s/g, '');
I have changed the regex from the solution you've posted with \s, which matches all kinds of space, not just the whitespace character.

You could count all the caracters, including spaces, with this:
var val = Field.value;
var chars = val.length;
Then you can count how many spaces do you have:
var spacesArr = val.split(" ");
var spaces = spacesArr.length;
Finally, if you substract the values, you have the actual characters count:
var actualLength = chars - spaces;

Jquery: Copy text from a form to a DIV while checking the last letter

On my HTML form, users can enter their name.
Their name will then appear in a DIV as part of a book title.
The book title uses apostrophe 's (e.g. Amy's Holiday Album).
If the user enters a name which ends in a S, I don't want the apostrophe s to appear.
(e.g. it should be Chris' Holiday Album instead of Chris's Holiday Album).
I also only want this to occur if the form has a class of apostrophe. If this class does not exist, then the name should be copied as is without any apostrophe or 's'.
I know you can use slice() to get the last character of an element, so I thought I could combine this with an if statement. But it doesn't seem to work.
Here is JSFiddle
Here is my HTML:
<div><b class="title"></b> Holiday Album</div>
Here is my Jquery (1.8.3):
$(document).ready(function() {
$('.name').keyup(function() {
var finalname = text($(this).val());
var scheck = finalname.slice(-1);
var finaltitle;
if ($(".apostrophe")[0]) {
if (scheck == 's') {
finaltitle = finalname + "'";
}
else {
finaltitle = finalname + "'s";
}
$('.title').text(finaltitle);
}
else {
$('.title').text(finalname);
}
});
});

text method is not needed on
var finalname = $(this).val();
check fiddle

Use
var finalname = $(this).val();
instead of
var finalname = text($(this).val());

Simplified version
$(document).ready(function() {
//Code fires when user starts typing:
$('.name.apostrophe').keyup(function() {
if (this.value.indexOf("'s") != -1 ) {
$('.title').text(this.value.replace(/'s/g, "'"));
} else {
$('.title').text(this.value)
}
}); /* Capture Personalised Message */
});
This will also replace all occurrences of the 's with ' only.
Hope it helps!.

Implementing a highlight feature for a live search in JavaScript/JQuery

I'm trying to implement a highlighting feature for a livesearch.
What I do is, send an ajax request with an token the user looks for. I receive an html text containing a table.
So I thought I could use a simple regex, looking for the users token and then surround it with a span, but I am receiving some longfilled <a> - Tags, so chances are good that the user types something and I break my HTML by replacing something inside a tag.
So how can I exclude html tags in my search?
Oh I'm using javascript regexp.

You would need to load jQuery highlight plugin and then you can just do something like this:
var words = "keyword1,keyword2,keyword3";
var keywords = words.split(',');
for(var i = 0; i < keywords.length; i++) {
$(selector).highlight($.trim(keywords[i]));
}
If you wanna do highlighting in the entire page, then replace selector with 'body', otherwise use selector for desired element.

//These results to be highlighted
var results = [];
results[0] = 'jquery';
results[1] = 'json';
results[2] = 'Java Script';
results[3] = 'java';
results[4] = 'java Update';
results[5] = 'javelin';
results[6] = 'James';
results[7] = 'jacob';
results[8] = 'Jail';
results[9] = 'Jailor';
jQuery(document).ready(function(){
//Search the results
jQuery('#search').live('keyup', function(event){
var term = jQuery(this).val();//keyword to be matched
var htm = '';
//Keys with codes 40 and below are special (enter, arrow keys, escape, etc.), Key code 8 is backspace.
if(event.keyCode > 40 || event.keyCode <91 || event.keyCode == 8 ||
event.keyCode == 20 || event.keyCode == 16 || event.keyCode == 9 ||
event.keyCode == 37 || event.keyCode == 38 || event.keyCode == 39 ||
event.keyCode == 40) {
for(x in results){
var match = results[x];
if(match.toLowerCase().indexOf(term.toLowerCase()) != -1){
var o = '<b><u>'+term+'</u></b>';
var a = match.replace(term, o);
htm += '<li>'+a+'</li>';
}
}
//create a orderd list for the matched results
var output = '<ol>' + htm + '</ol>';
if (htm.length > 0) {
jQuery('#result').show().append(output);
}
}
});
});
The complete tutorial can be found here: http://www.webspeaks.in/2012/09/live-text-search-highlight-using.html

Not sure how well the jQuery plugin works, here is the script I came up with but doesn't highlight text over multiple tags.
If I want to highlight "my script" and the html looks like "my script" then it would not be highlighted. Still working on that part.
Here is the script so far:
str='<img src="brown fox.jpg" title="The brown fox" />'
+'<p>some text containing fox. And onother fox.</p>'
var word="fox";
word="(\\b"+
word.replace(/([{}()[\]\\.?*+^$|=!:~-])/g, "\\$1")
+ "\\b)";
var r = new RegExp(word,"igm")
str.replace(/(>[^<]+)/igm,function(a){
return a.replace(r,"<span class='hl'>$1</span>");
})