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How to bind 2 input fields dynamically added in a table with Jquery

I am not very familiar with javascript/Jquery Syntax, I would like to bind 2 input text fields that were dynamically added to a table inside a loop. The main goal is to automatically fill the second text field with text from the first one. I was able to do it for 2 static text field by doing that.
$(document).bind('input', '#changeReviewer', function () {
var stt = $('#changeReviewer').val();
stt = stt.replace(/ /g,'.')
$("#changeReviewerEmail").val(stt + "##xxxxxx.com");
});
I have tried a few things but when I try to get the value of the first input, it always returns empty. Thanks.

Check this code
$(document).on('input', '#changeReviewer', function() {
var stt = $('#changeReviewer').val();
stt = stt.replace(/ /g, '.');
$("#changeReviewerEmail").val(stt + "##xxxxxx.com");
});
$('#addbtn').click(function() {
$('div').empty().append(`<input id='changeReviewer'><input id='changeReviewerEmail'>`);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
<button id='addbtn'>add inputs</button>
</div>

Unable to get value of input field, even through text() and val() methods

I want to get the value of an input field that a user will type into, then do things with it. I've tried the two ways to get value , text() and val(), on the input fields, but neither work.
Kindly advise on what it could be that I'm missing here.
What happens exactly in the code below is that after hovering a button, the value of an input field would be shown through an alert() function. But the alert is constantly blank.
HTML
<div id="collection_name">
collection name
</div>
<input type="text" id="collection_title" placeholder="Midnight in New York">
<div id="collection_button"></div>
jQuery
var collection_title = $('#collection_title').text();
var collection_button = $('#collection_button');
collection_button.on({
mouseover: function() {
alert(collection_title); // the alert comes out blank
}
});

You need to call the text()/val() methods within the handler itself
var collection_title = $('#collection_title');
var collection_button = $('#collection_button');
collection_button.on({
mouseover: function() {
alert(collection_title.val()); //or .text() depending on the element type
}
});
The reason it was blank before is at the time of initializing
var collection_title = $('#collection_title').text();
it had no text value

Demo Fiddle
var collection_title = $('#collection_name').text();
var collection_button = $('#collection_button');
collection_button.on({
mouseover: function () {
alert(collection_title); // the alert comes out blank
}
});

JavaScript to clear SharePoint Text Filter box on focus

I am using the following code to clear default value which is "Keyword ...." from a SharePoint text filter box. I put in an alert at line 10 but it doesn't pop-up. Do you any reason why it would not clear the Text Box when a user clicks inside the box to type something.
<script type="text/javascript">
// Clears text box on click or focus
var TextBoxID = document.getElementById("ctl00_m_g_22e9e7dd_3da6_4f0b_bc1c_0874742c6012_SPTextSlicerValueTextControl");
TextBoxID.focus(function()
{
if(this.value == "Keyword ....")
{
alert('test line 10');
$(this).val("");
}
});
</script>

It looks like you may have an error in your jQuery selector.
Should that have been $('#'+searchID).focus(...)?
If not, I was mislead by the reuse of "searchID" as a local variable and the name of a class on an element.

Try something like this?
HTML
Search Box: <input onclick="clearPlaceholder();" id="ctl00_m_g_22e9e7dd_3da6_4f0b_bc1c_0874742c6012_SPTextSlicerValueTextControl" type="text" name="fname" value="Keyword..."><br>
JS
function clearPlaceholder(){
var TextBoxID = document.getElementById("ctl00_m_g_22e9e7dd_3da6_4f0b_bc1c_0874742c6012_SPTextSlicerValueTextControl");
TextBoxID.value = "";
}
http://jsfiddle.net/z5h6H/2/

Here is the code that solved the issue. I needed to clear the value in the text field when user click inside the text box.
<script type="text/javascript">
// Clears text box on click or focus
var TextBoxID = document.getElementById('ctl00_m_g_22e9e7dd_3da6_4f0b_bc1c_0815182c6012_SPTextSlicerValueTextControl');
TextBoxID.onfocus = function(){
if(this.value == 'Keyword ....')
{
TextBoxID.value="";
}
};
</script>

How to get the values of html hidden wrapped by a div using jquery?

Im very new to javascript and jquery so please bear with me.
Here's my code: http://jsfiddle.net/94MnY/1/
Im trying to get the values of each hidden field inside the div.
I tried
$(document).ready(function() {
$('input#btnDispHidden').click(function() {
var totalHidden = 7;
for(var i=0; i<totalHidden; i++) {
alert($("#hiddenField hidden").html());
}
});
});
but the value Im getting is null.
I also wanna know how to get the total number of html elements inside a div. In my case how am I gonna get the total number hidden field inside the div. I assigned the value of totalHidden = 7 but what if I dont know total number of hidden fields.
Please help. Thanks in advance.

$('#hiddenField hidden') is attempting to access an actual <hidden> tag that is a child of #hiddenField
Try this instead. What you want to use is the input[type=hidden] selector syntax. You can then loop through each of the resulting input fields using the jQuery.each() method.

If you want to iterate over the <input> elements and alert each value try this:
$(document).ready(function() {
$('input#btnDispHidden').click(function() {
$('#hiddenField input').each(function() {
alert(this.value);
});
});
});
http://jsfiddle.net/94MnY/8/

Here it is.
Basically, you are looking for .each(). I removed a few input fields because so many alert messages are annoying. Also added in the selector the type hidden to avoid getting your last input field.
$(document).ready(function() {
$('input#btnDispHidden').click(function() {
$('input[type="hidden"]').each(function(i){
alert($(this).attr('value'))
})
});
});

To stick to what you already have - but with few modifications:
DEMO
$(document).ready(function() {
$('input#btnDispHidden').click(function() {
var totalHidden = $('#hiddenField input[type=hidden]').length; // get number of inputs
for(var i=0; i<totalHidden; i++) {
alert($("#hiddenField input[type=hidden]").eq(i).val());
}
});
});

You can actually just create an array of those hidden elements using query and loop through them and alert their values.
I have put a jsfiddle for you to see
http://jsfiddle.net/94MnY/4/
$(document).ready(function() {
$('input#btnDispHidden').click(function() {
$("#hiddenField input[type='hidden']").each(function(i, e){
alert($(this).val());
});
});
});

Try
$('#hiddenfield input[type=hidden]').each(function(){
alert(this.val());
});

add and remove a certain value from a text field

each checkbox that i check, i fill the input with it's id
now, how can i retrieve this id that i put inside the input if the user uncheck the checkbox?
exp:
estate SC,SP was checked;
input recieve SC,SP value in this format = SC,SP
but the user uncheck the checkbox with SC value, then SC should be removed from the input.
this is what i'm doing to fill the input with the checkboxes.
var separador = ",";
var estadosS = "";
$(".checkboxEstados").live("click", function(){
if($(this).is(":checked")){
estadosS += (estadosS == "") ? "" : separador;
estadosS += $(this).attr("id");
$("#holdEstados").val(estadosS);
}else{
// now i'm just cleaning all the input,
// but i need to clean only the checkbox that was unchecked
$("#holdEstados").val("");
}
});
dont know if i was clear, any question, be my guest.
Thanks.

An easy way to solve this is to avoid parsing and removing parts of the data. Instead of trying to remove 'SC', instead regenerate the entire contents of the text field each time any checkbox is selected.
When a checkbox click event is detected, deleted the contents of the text input field, scan all of the selected checkboxes, and include their IDs in the text input field.

You're logic can be greatly simplified. Simply grab each checkbox that is checked when the click event fires:
$(".checkboxEstados").live("click", function() {
var aryIds = new Array();
$(".checkboxEstados:checked").each(function() {
aryIds.push($(this).attr("id"));
});
$("#holdEstados").val(aryIds.toString());
});
Here's a working fiddle.

I would store the value in an array and add and remove values from it and then write the array to the output instead of trying to parse the text each time:
var estadosS = [];
$(".checkboxEstados").live("click", function(){
var index;
if($(this).is(":checked")){
// append the id to the list
estadosS.push($(this).attr("id"));
}else{
index = estadosS.indexOf($(this).attr("id"));
if(index > -1) {
estadosS.splice(index, 1);
}
}
$("#holdEstados").val(estadosS.join(separador));
});

If all you are aiming to do is get a list of the checked values from all the check boxes, you could do:
$('.checkboxEstados:checked').each(function(){
alert($(this).val());
});
And that should return all the check box items that have been checked. Then you don't have to worry about adding and removing data from a text box. I'm just alerting the value, you would want to store them into an object or something more useful.