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Add bullet to multiple textarea and hidden textareas

I'm trying to add bullets to multiple textarea. This works fine when the textareas are not hidden, however I'd like to be able to add bullets to newly created textareas (click on the button "Add New". Ideally I'd like also newly created bullets to go to the next line rather than to be displayed side by side.
$(document).ready()
$('.add-bullet').click(function() {
$(this).parent().next('textarea').val(function(idx, value){
return value + '\u2022';
});
return false;
});
(function($) {
"use strict";
var itemTemplate = $('.workExperience-template').detach(),
editArea = $('.workExperience-area'),
itemNumber = 1;
$(document).on('click', '.workExperience-area .add', function(event) {
var item = itemTemplate.clone();
item.find('[name]').attr('name', function() {
return $(this).attr('name') + '_' + itemNumber;
});
++itemNumber;
item.prependTo(editArea);
});
$(document).on('click', '.workExperience-area .rem', function(event) {
editArea.children('.workExperience-template').last().remove();
});
$(document).on('click', '.workExperience-area .del', function(event) {
var target = $(event.target),
row = target.closest('.workExperience-template');
row.remove();
});
}(jQuery));
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="textarea">
<div>Add bullet</div>
<textarea id="todolist" class="todolist" name="todolist" placeholder="Write something.." ></textarea>
</div>
<div class="hidden">
<div class="workExperience-template">
<div class="textarea">
<div>Add bullet</div>
<textarea id="list" class="list" name="tata" placeholder="Write something.." ></textarea>
</div>
</div>
</div>
<div class="workExperience-area">
<button type="button" class="add buttonBlueAddField">Add New</button>
</div>

You should attach click event on newly created anchors:
$(document).ready()
$('.add-bullet').click(function() {
$(this).parent().next('textarea').val(function(idx, value){
return value + '\u2022';
});
return false;
});
(function($) {
"use strict";
var itemTemplate = $('.workExperience-template').detach(),
editArea = $('.workExperience-area'),
itemNumber = 1;
$(document).on('click', '.workExperience-area .add', function(event) {
var item = itemTemplate.clone();
item.find('[name]').attr('name', function() {
return $(this).attr('name') + '_' + itemNumber;
});
++itemNumber;
item.find(".add-bullet").click(function() {
$(this).parent().next('textarea').val(function(idx, value){
return value + '\u2022\n';
});
return false;
});
$(".textarea").next().append(item);
});
$(document).on('click', '.workExperience-area .rem', function(event) {
editArea.children('.workExperience-template').last().remove();
});
$(document).on('click', '.workExperience-area .del', function(event) {
var target = $(event.target),
row = target.closest('.workExperience-template');
row.remove();
});
}(jQuery));
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="textarea">
<div>Add bullet</div>
<textarea id="todolist" class="todolist" name="todolist" placeholder="Write something.." ></textarea>
</div>
<div class="hidden">
<div class="workExperience-template">
<div class="textarea">
<div>Add bullet</div>
<textarea id="list" class="list" name="tata" placeholder="Write something.." ></textarea>
</div>
</div>
</div>
<div class="workExperience-area">
<button type="button" class="add buttonBlueAddField">Add New</button>
</div>

How to clear my input if button is clicked and at the same time make button unclickable if input is empty?

I want to create a simple chat but don't know how to clear my input if the button is clicked and at the same time make button unclickable if the input is empty. This is how I did but it doesn't work.
function ctrlButton() {
btn.disabled = this.value.trim().length === 0;
}
text.addEventListener('input', ctrlButton, false);
ctrlButton.call(text);
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>

Everything you are doing is good,You just need to add btn.disabled =true; inside click event.
function ctrlButton() {
btn.disabled = this.value.trim().length === 0;
}
text.addEventListener('input', ctrlButton, false);
ctrlButton.call(text);
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
btn.disabled =true;
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>
Better version
$("#text").on("input propertychange paste",function(){
debugger;
if($(this).val()===''){
$('#btn').attr('disabled',true);
}else{
$('#btn').removeAttr('disabled');
}
});
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
$('#btn').attr('disabled',true);
}
});
$('#btn').attr('disabled',true);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>

Your logic is pretty much correct. The last thing you need to do is to disable the button when you clear the value of the input.
Note that I converted the example below to use jQuery entirely to save confusion.
var $btn = $('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
$btn.prop('disabled', true);
}
});
$('#text').on('input', function() {
var $text = $(this);
$btn.prop('disabled', function() {
return $text.val().trim().length === 0;
});
}).trigger('input');
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>

First set your button to disabled like this:
<button class="button button1" id="btn" disabled>Send</button>
Then to disable the button when the <input> is empty put those functions in a <script> tag at the bottom of your document:
$('#text').keyup(function(){
if ($('#text').val() != '') {
$('#btn').prop('disabled', false);
}
});
$('#btn').click(function(){
$('#text').val('');
$('#btn').prop('disabled', true);
});
This should work for you.

Your code is correct, you just need to add$(this).attr("disabled",true); line at last of your button's onclick event.
Here's the JSFiddle Link
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
}
$(this).attr("disabled",true);
});

function ctrlButton() {
btn.disabled = this.value.trim().length === 0;
}
text.addEventListener('input', ctrlButton, false);
ctrlButton.call(text);
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
$('#btn').prop('disabled', true);
}
else
{
$('#btn').prop('disabled', false);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>

function ctrlButton() {
btn.disabled = this.value.trim().length === 0;
}
text.addEventListener('input', ctrlButton, false);
ctrlButton.call(text);
$('#btn').on('click', function(e) {
e.preventDefault();
var val = $('#text').val();
if (val.length >= 1) {
$('#text').val("");
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="sendCtrls">
<input type="text" autocomplete="off" placeholder="Your message is here" id='text'>
<button class="button button1" id="btn">Send</button>
</div>

Disable submit button until all form inputs have data

I'm trying to disable the submit button until all inputs have some data. Right now the button is disabled, but it stays disabled after all inputs are filled in. What am I doing wrong?
$(document).ready(function (){
validate();
$('input').on('keyup', validate);
});
function validate(){
if ($('input').val().length > 0) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}

Here's a modification of your code that checks all the <input> fields, instead of just the first one.
$(document).ready(function() {
validate();
$('input').on('keyup', validate);
});
function validate() {
var inputsWithValues = 0;
// get all input fields except for type='submit'
var myInputs = $("input:not([type='submit'])");
myInputs.each(function(e) {
// if it has a value, increment the counter
if ($(this).val()) {
inputsWithValues += 1;
}
});
if (inputsWithValues == myInputs.length) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text"><br>
<input type="text"><br>
<input type="text"><br>
<input type="submit" value="Join">

Vanilla JS Solution.
In question selected JavaScript tag.
HTML Form:
<form action="/signup">
<div>
<label for="username">User Name</label>
<input type="text" name="username" required/>
</div>
<div>
<label for="password">Password</label>
<input type="password" name="password" />
</div>
<div>
<label for="r_password">Retype Password</label>
<input type="password" name="r_password" />
</div>
<div>
<label for="email">Email</label>
<input type="text" name="email" />
</div>
<input type="submit" value="Signup" disabled="disabled" />
</form>
JavaScript:
var form = document.querySelector('form')
var inputs = document.querySelectorAll('input')
var required_inputs = document.querySelectorAll('input[required]')
var register = document.querySelector('input[type="submit"]')
form.addEventListener('keyup', function(e) {
var disabled = false
inputs.forEach(function(input, index) {
if (input.value === '' || !input.value.replace(/\s/g, '').length) {
disabled = true
}
})
if (disabled) {
register.setAttribute('disabled', 'disabled')
} else {
register.removeAttribute('disabled')
}
})
Some explanation:
In this code we add keyup event on html form and on every keypress check all input fields. If at least one input field we have are empty or contains only space characters then we assign the true value to disabled variable and disable submit button.
If you need to disable submit button until all required input fields are filled in - replace:
inputs.forEach(function(input, index) {
with:
required_inputs.forEach(function(input, index) {
where required_inputs is already declared array containing only required input fields.
JSFiddle Demo: https://jsfiddle.net/ydo7L3m7/

You could try using jQuery Validate
http://jqueryvalidation.org/
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.js"></script>
And then do something like the following:
$('#YourFormName').validate({
rules: {
InputName1: {
required: true
},
InputName2: { //etc..
required: true
}
}
});

Refer to the sample here.
In this only input of type="text" has been considered as described in your question.
HTML:
<div>
<form>
<div>
<label>
Name:
<input type="text" name="name">
</label>
</div>
<br>
<div>
<label>
Age:
<input type="text" name="age">
</label>
</div>
<br>
<div>
<input type="submit" value="Submit">
</div>
</form>
</div>
JS:
$(document).ready(function () {
validate();
$('input').on('keyup check', validate);
});
function validate() {
var input = $('input');
var isValid = false;
$.each(input, function (k, v) {
if (v.type != "submit") {
isValid = (k == 0) ?
v.value ? true : false : isValid && v.value ? true : false;
}
if (isValid) {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
});
}

Try to modify your function like this :
function validate(){
if ($('input').val() != '') {
$("input[type=submit]").prop("disabled", false);
} else {
$("input[type=submit]").prop("disabled", true);
}
}
and place some event trigger or something like onkeyup in jquery.But for plain js, it looks like this :
<input type = "text" name = "test" id = "test" onkeyup = "validate();">
Not so sure of this but it might help.

Here is a dynamic code that check all inputs to have data when wants to submit it:
$("form").submit(function(e) {
var error = 0;
$('input').removeClass('error');
$('.require').each(function(index) {
if ($(this).val() == '' || $(this).val() == ' ') {
$(this).addClass('error');
error++;
}
});
if (error > 0) {
//Means if has error:
e.preventDefault();
return false;
} else {
return true;
}
});
.error {
border: 1px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<form>
<form action="google.com">
<input type="text" placeholder="This is input #1" class="require" />
<input type="text" placeholder="This is input #2" class="require" />
<input type="submit" value="submit" />
</form>
</form>
Now you see there is a class called require, you just need to give this class to inputs that have to have value then this function will check if that input has value or not, and if those required inputs are empty Jquery will prevent to submit the form!

Modify your code
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" type="text/javascript"></script>
<input type="text"><br>
<input type="text"><br>
<input type="text"><br>
<input type="submit" value="Join">
<script>
$(document).ready(function (){
validate();
$('input').on('keyup', validate);
});
function validate(){
$("input[type=text]").each(function(){
if($(this).val().length > 0)
{
$("input[type=submit]").prop("disabled", false);
}
else
{
$("input[type=submit]").prop("disabled", true);
}
});
}
</script>

function disabledBtn(_className,_btnName) {
var inputsWithValues = 0;
var _f = document.getElementsByClassName(_className);
for(var i=0; i < _f.length; i++) {
if (_f[i].value) {
inputsWithValues += 1;
}
}
if (inputsWithValues == _f.length) {
document.getElementsByName(_btnName)[0].disabled = false;
} else {
document.getElementsByName(_btnName)[0].disabled = true;
}
}
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="text" class="xxxxx" onKeyUp="disabledBtn('xxxxx','fruit')"><br>
<input type="submit" value="Join" id="yyyyy" disabled name="fruit">

Issue on Checking Multi Inputs Calculation Using each()

Can you please take a look at this Demo and let me know why I am not able to do the calculation check using the each iterator?
As you can see I tried to use :
if (!parseInt($(this).val()) === ((parseInt($(this).closest('div').find('.upper').text())) - parseInt($(this).closest('div').find('.lower').text()))) {}
Which it didnt work then I used this :
if (!parseInt($(this).val()) === ((parseInt($(this).prev('.upper').text())) - parseInt($(this).prev('.lower').text()))) {
but still not validating the input?

I'm not sure if that what you want to achieve, take a look at following example :
$('#test').on('click', function (e) {
$("input").each(function () {
if ($(this).val().length === 0)
{
$(this).addClass('input-error');
} else {
var upper = parseInt($(this).prev().prev().text());
var lower = parseInt($(this).prev().text());
var current_value = parseInt($(this).val());
if (current_value != (upper-lower)){
$(this).addClass('input-error');
}else{
$(this).removeClass('input-error');
}
}
});
});
.input-error {
background: red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="upper">5</div>
<div class="lower">2</div>
<input type="text" id="txt1">
<hr />
<div class="upper">7</div>
<div class="lower">3</div>
<input type="text" id="txt2">
<hr />
<div class="upper">200</div>
<div class="lower">66</div>
<input type="text" id="txt3">
<hr />
<br />
<button type='button' id="test">Test</button>

jquery .prop('disabled', true) not working

I am attempting to toggle disabled = true|false on a <input type="text">, using a checkbox. I am able to get the value of the input, but I cannot set the input to disabled.
my jquery/js code
<script>
$(function () {
$('.date').datepicker();
$('body').on('change', '.housing', function () {
if ($(this).val() == 'dorms') {
$(this).parent().next(".dorms").show();
} else {
$(this).parent().siblings(".dorms").hide();
}
});
$('body').on('change', '.single', function () {
if ($(this).checked) {
$('#echo1').text($(this).prev(".roommate").val()); // this works
$(this).prev(".roommate").val(''); // does not empty the input
$(this).prev(".roommate").disabled = true; // does not set to disabled
$(this).prev(".roommate").prop('disabled', true); // does not set to disabled
$('#echo2').text($(this).prev(".roommate").prop('disabled')); // always says false
} else {
$('#echo1').text($(this).prev(".roommate").val()); // this works
$(this).prev(".roommate").disabled = false; // always stays false
$('#echo2').text($(this).prev(".roommate").prop('disabled')); // always says false
}
});
});
</script>
my html code
<div class="registration_housing particpant_0" data-sync="0">
<div>
<label class="particpant_0"></label>
</div>
<div>
<label>Off Campus (not included)</label>
<input type="radio" name="housing[0]" value="none" class="housing" />
</div>
<div>
<label>On Campus</label>
<input type="radio" name="housing[0]" value="dorms" class="housing" />
</div>
<div class="dorms" style="display:none;">
<div>
<label>Checkin:</label>
<input type="text" name="check_in[0]" class="date" />
</div>
<div>
<label>Checkout:</label>
<input type="text" name="check_out[0]" class="date" />
</div>
<div>
<label>Roommate:</label>
<input type="text" name="roommate[0]" class="roommate" />
<input type="checkbox" name="roommate_single[0]" value="single" class="single" />check for singe-occupancy</div>
</div>
<div class="line">
<hr size="1" />
</div>
</div>
<div>
<label id="echo1"></label>
</div>
<div>
<label id="echo2"></label>
</div>
you can see this at http://jsfiddle.net/78dQE/1/
Any idea why I can get the value of (".roommate") - ie. $(this).prev(".roommate").val()
but
$(this).prev(".roommate").disabled = true;
OR
$(this).prev(".roommate").prop('disabled', true);
will not set (".roommate") to disabled?

Your issue is mixing jquery with DOM element attributes
change if ($(this).checked) { to if (this.checked) {
With jquery you would do
$(this).is(':checked') // But you could just do this.checked
And
$(this).prev(".roommate").prop('disabled', false); // or $(this).prev(".roommate")[0].disabled = false;
instead of
$(this).prev(".roommate").disabled = false;
Fiddle
So you just probably need this:
$('body').on('change', '.single', function () {
$(this).prev(".roommate").prop('disabled', this.checked).val('');
});