"Add _ Delete_Divs"
Bootstrap 3.3.0 Snippet by ravindra93

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/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 class="row">
<div class='element row' id='div_1'>
<div class="col-md-3">
<div class="form-group">
<label>Chapter Name</label>
<input type='text' placeholder='Enter your skill' id='txt_1' class="form-control">
</div>
</div>
<div class="col-md-3">
<div class="form-group">
<label>Chapter Video/Url</label>
<input type='text' placeholder='Enter your skill' id='txt_1' class="form-control">
</div>
</div>
<div class="col-md-3">
<div class="form-group">
<label>Chapter Name</label>
<input type='text' placeholder='Enter your skill' id='txt_1' class="form-control">
</div>
</div>
<div class="col-md-3">
<button type="button" class='btn btn-primary add mt-20'>Add Chapter</button>
</div>
</div>
<!-- Subchapter -->
<div class='subelement row' id='subdiv_1'>
<div class="col-md-3">
<div class="form-group">
<label>SubChapter Name</label>
<input type='text' placeholder='Enter your skill' id='subtxt_1' class="form-control">
</div>
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.mt-20{margin-top: 20px;}
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$(document).ready(function(){
// Add new element
$(".add").click(function(){
// Finding total number of elements added
var total_element = $(".element").length;
// last <div> with element class id
var lastid = $(".element:last").attr("id");
var split_id = lastid.split("_");
var nextindex = Number(split_id[1]) + 1;
var max = 1000;
// Check total number elements
if(total_element < max ){
// Adding new div container after last occurance of element class
$(".element:last").after("<div class='element' id='div_"+ nextindex +"'></div>");
// Adding element to <div>
$("#div_" + nextindex).append("<div class='row'><div class='col-md-3'> <div class='form-group'> <label>Chapater Name</label><input type='text' class='form-control' placeholder='Enter your skill' id='txt_"+ nextindex +"'> </div></div><div class='col-md-3'><div class='form-group'> <label>Chapater Video/Url</label><input type='text' class='form-control' placeholder='Enter your skill' id='txt_"+ nextindex +"'> </div></div><div class='col-md-3'><div class='form-group'> <label>Chapater Name</label><input type='text' class='form-control' placeholder='Enter your skill' id='txt_"+ nextindex +"'> </div></div><button id='remove_" + nextindex + "' class='remove btn btn-danger mt-20'>X</button></div>");
}
}); //add chapter
$(".subadd").click(function(){
// Finding total number of elements added
var total_element = $(".subelement").length;
// last <div> with element class id
var lastid = $(".subelement:last").attr("id");
var split_id = lastid.split("_");
var subindex = Number(split_id[1]) + 1;
var max = 1000;
// Check total number elements
if(total_element < max ){
// Adding new div container after last occurance of element class
$(".subelement:last").after("<div class='subelement' id='subdiv_"+ subindex +"'></div>");
// Adding element to <div>
$("#subdiv_" + subindex).append("<div class='row'><div class='col-md-3'> <div class='form-group'> <label>SubChapater Name</label><input type='text' class='form-control' placeholder='Enter your skill' id='subtxt_"+ subindex +"'> </div></div><div class='col-md-3'><div class='form-group'> <label>SubChapater Video/Url</label><input type='text' class='form-control' placeholder='Enter your skill' id='subtxt_"+ subindex +"'> </div></div><div class='col-md-3'><div class='form-group'> <label>SubChapater Name</label><input type='text' class='form-control' placeholder='Enter your skill' id='subtxt_"+ subindex +"'> </div></div><button id='remove_" + subindex + "' class='subremove btn btn-danger mt-20'>X</button></div>");
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