using check box selected append textarea and update textarea value using jQuery - php

Question

I have problem in updating value of textarea.
when this checkbox is checked , it will show textarea. Now the problem is i am not able to add and save some more text in the textarea.
For example, as of now the textarea shows CBC value, but if i change it to CBC NEW, then it should be update to CBC NEW.
('#contactform :checkbox.one_c').change(function() {
var $this = $(this);
if ($this.is(':checked')) {
var newInput = $('<textarea id="addme" class="doctor1 value" ><div id="c-content"></div></textarea>');
$('#contactform').append(newInput);
$("textarea").text("CBC");
$('#contactform :checkbox.one_c').attr("checked", "checked");
} else {
$('#contactform').find('#addme').remove();
$('#contactform :checkbox.one_c').removeAttr('checked');
}
});
<form class="textboxes1" method="post" id="tb2_1964">
<div id="contactform">
<div class="row">
<div class="col-md-3 col-sm-4 col-xs-12 remove_all">
<input type="checkbox" class="checkbox-inline one_c" checked="checked">
<label>CBC </label>
</div>
</div>
<textarea id="addme" class="doctor1 value">CBC</textarea>
<div id="c-content"></div>
</div> <button class="patient_add2 no_print">Save</button>
</form>

Answer 1

problem in your JS code. Try this hope this is helpful for you
$('.one_c').change(function() {
var $this = $(this);
if ($this.is(':checked')) {
var newInput = $('<textarea id="addme" class="doctor1 value" ><div id="c-content"></div></textarea>');
$('#contactform').append(newInput);
$("textarea").text("CBC");
$('#contactform :checkbox.one_c').attr("checked", "checked");
} else {
$('#contactform').find('#addme').remove();
$('#contactform :checkbox.one_c').removeAttr('checked');
}
});
$('.patient_add2').click(function(){
alert($("textarea").val());
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<form class="textboxes1" method="post" id="tb2_1964">
<div id="contactform">
<div class="row">
<div class="col-md-3 col-sm-4 col-xs-12 remove_all">
<input type="checkbox" class="checkbox-inline one_c" checked="checked">
<label>CBC </label>
</div>
</div>
<textarea id="addme" class="doctor1 value">CBC</textarea>
<div id="c-content"></div>
</div> <button class="patient_add2 no_print">Save</button>
</form>