"SMS Box"
Bootstrap 4.1.1 Snippet by tejlavwaladhaval

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div>
<br style="clear:both">
<div class="form-group col-md-4 ">
<label id="messageLabel" for="message">Message </label>
<textarea class="form-control input-sm " type="textarea" id="message" placeholder="Message" maxlength="140" rows="7"></textarea>
<span class="help-block"><p id="characterLeft" class="help-block ">You have reached the limit</p></span>
</div>
<br style="clear:both">
<div class="form-group col-md-2">
<button class="form-control input-sm btn btn-success disabled" id="btnSubmit" name="btnSubmit" type="button" style="height:35px"> Send</button>
</div>
</div>
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.red{
color:red;
}
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$(document).ready(function(){
$('#characterLeft').text('140 characters left');
$('#message').keyup(function () {
var max = 140;
var len = $(this).val().length;
if (len >= max) {
$('#characterLeft').text('You have reached the limit');
$('#characterLeft').addClass('red');
$('#btnSubmit').addClass('disabled');
}
else {
var ch = max - len;
$('#characterLeft').text(ch + ' characters left');
$('#btnSubmit').removeClass('disabled');
$('#characterLeft').removeClass('red');
}
});
});
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