append html form element
<script src="http://code.jquery.com/jquery-2.1.3.min.js"></script>
<script>
$(document).ready(function () {
$(".add_exp1").click(function(){
$(".exp").append('<br><label for="exp">Another Work Experience<br><br>Company Name: </label>' +
'<input type="input" style="width: 60%;" class="form-control" id="company_name" placeholder="Company Name">'+
'<br>'+
'<label for="exp"><br><br>Position: </label>'+
'<input type="input" class="form-control" id="position" placeholder="Position">'+
'<label for="bday"> Duration:'+
' </label>'+
'<input id="date-picker-2" type="date" class="date-picker form-control" placeholder="Date Started"/>'+
'<input id="date-picker-3" type="date" class="date-picker form-control" placeholder="Date Ended"/> <input type="checkbox"'+
'id="present" value="present"> Present'+
'<br><br><br>');
});
})
</script>