Develop Reference

Adding a new element dynamically with jQuery problem

I have a script element with HTML content to be added dynamically to page
I've tried adding it using jQuery with the following code:
let template = jQuery.validator.format($.trim($('#customTemplate').html()));
$($(template()).html()).appendTo('.custom-class');
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.3/jquery.validate.min.js" integrity="sha512-37T7leoNS06R80c8Ulq7cdCDU5MNQBwlYoy1TX/WUsLFC2eYNqtKlV0QjH7r8JpG/S0GUMZwebnVFLPd6SU5yg==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<script type="text/html" id="customTemplate">
<div class="col-sm-4">
<div class="form-group">
<label>Days: <span class="text-danger">*</span></label>
<input type="date" name="Days" placeholder="Days..." class="form-control required data-required">
</div>
</div>
</script>

Why the trim?
Why not a template
This works
let template = $('#customTemplate')[0].content;
$('.custom-class').append(template)
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<template id="customTemplate">
<div class="col-sm-4">
<div class="form-group">
<label>Days: <span class="text-danger">*</span></label>
<input type="date" name="Days" placeholder="Days..." class="form-control required data-required">
</div>
</div>
</template>
<div class="custom-class"></div>

datepicker is not a function in bootstrap 4.1

I am working on a domain in which I want to make the calendar visible on click of a search input box.
The HTML code which I have used in order to place a input boxes are:
<div class="dates">
<div class="start_date">
<input class="form-control start_date mb-4" type="text" placeholder="start date" id="startdate_datepicker">
<span class="fa fa-calendar start_date_calendar" aria-hidden="true "></span>
</div>
<div class="end_date">
<input class="form-control end_date mb-4" type="text" placeholder="end date" id="enddate_datepicker">
<span class="fa fa-calendar end_date_calendar" aria-hidden="true "></span>
</div>
</div>
The script files which I have used is:
<script>
$("#startdate_datepicker").datepicker();
$("#enddate_datepicker" ).datepicker();
</script>
Problem Statement:
I am wondering what changes I need to make in the order of script files from my domain in order to make that work.
I have a feeling the script files are placed in a wrong order in my domain.

The bootstrap-datepicker is not a part of the Bootstrap. So,you have to include datepicker plugin code, before use it.
$("#startdate_datepicker").datepicker();
$("#enddate_datepicker").datepicker();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" integrity="sha384-9gVQ4dYFwwWSjIDZnLEWnxCjeSWFphJiwGPXr1jddIhOegiu1FwO5qRGvFXOdJZ4" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" />
<!-- Include Bootstrap Datepicker -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/css/bootstrap-datepicker.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/js/bootstrap-datepicker.min.js"></script>
<div class="dates">
<div class="start_date input-group mb-4">
<input class="form-control start_date" type="text" placeholder="start date" id="startdate_datepicker">
<div class="input-group-append">
<span class="fa fa-calendar input-group-text start_date_calendar" aria-hidden="true "></span>
</div>
</div>
<div class="end_date input-group mb-4">
<input class="form-control end_date" type="text" placeholder="end date" id="enddate_datepicker">
<div class="input-group-append">
<span class="fa fa-calendar input-group-text end_date_calendar" aria-hidden="true "></span>
</div>
</div>
</div>
If it's not possible to use CDN, you could place the CSS and JavaScript files of the plugin on your server and link to them.

I think you forgot to add jquery and bootstrap-datepicker to your domain
put this codes between <head></head>
Jquery:
Google CDN:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
or
Microsoft CDN:
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.3.1.min.js"></script>
Also add this:
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.3.0/js/bootstrap-datepicker.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.3.0/css/datepicker.css"/>

I've got the same issue.
First it was a mismatch beetween datepicker and datetimepicker.
Next I've got a new issue with the datetimepicker and found finally that for bootstrap 4.1 there is a sucessor to bootstrap-datepicker : Tempus Dominus.
The URL web site : https://tempusdominus.github.io/bootstrap-4/
From the "Installing" section :
<head>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.0.0-alpha14/js/tempusdominus-bootstrap-4.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.0.0-alpha14/css/tempusdominus-bootstrap-4.min.css" />
</head>
Next from the "Usage" section :
<div class="container">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<div class="input-group date" id="datetimepicker1" data-target-input="nearest">
<input type="text" class="form-control datetimepicker-input" data-target="#datetimepicker1"/>
<div class="input-group-append" data-target="#datetimepicker1" data-toggle="datetimepicker">
<div class="input-group-text"><i class="fa fa-calendar"></i></div>
</div>
</div>
</div>
</div>
<script type="text/javascript">
$(function () {
$('#datetimepicker1').datetimepicker();
});
</script>
</div>
</div>

Javascript not working - datepicker

I'm trying to use a datepicker and a time picker in my html form. My code is below :
<div class="form-group" style="width: 50%;">
<label>Date:</label>
<div class="input-group date">
<div class="input-group-addon">
<i class="fa fa-calendar"></i>
</div>
<input type="text" class="form-control pull-right" id="datepicker" name="date" >
</div>
<!-- /.input group -->
</div>
<div class='col-sm-6'>
<div class="form-group">
<div class='input-group date' id='datetimepicker3'>
<input type='text' class="form-control" />
<span class="input-group-addon">
<span class="glyphicon glyphicon-time"></span>
</span>
</div>
</div>
</div>
<label>
And I use the inclusions below:
<script src="bower_components/jquery/dist/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script type="text/javascript" src="bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="plugins/datepicker/datepicker3.css">
<link rel="stylesheet" href="plugins/timepicker/bootstrap-timepicker.min.css">
<script type="text/javascript" src="plugins/datepicker/locales/bootstrap-datepicker.fr.js"></script>
<script type="text/javascript" src="plugins/timepicker/bootstrap-timepicker.min.js"></script>
The html is working fine, I can see the datepicker field but I can't use it, the timepicker seems to got the same problem.
When I click on it, the calendar or the timepicker are not opening.
What is wrong?

where is your javascript to initialize fields and convert to datepickers? if you only do html markup, fields know nothing about functionality.
use this:
$('#datepicker').datepicker();
but first! read the docs...

Can't change the format of Bootstrap DateTimePicker

I want to make my DateTimePicker format to be yyyy-mm-dd because it is the format that I've inserted in my database.
Here is the markup:
<div class="col-sm-6">
<div class="input-group date" data-provide="datepicker">
<input type="text" class="form-control" id="repdate" name="repdate" placeholder="Report date" required>
<div class="input-group-addon">
<span class="glyphicon glyphicon-th"></span>
</div>
</div>
</div>
And here is the code I wrote to change the format, but it doesn't work:
$(document).ready(function() {
$(function () {
$('.datepicker').datetimepicker({
format: 'YYYY-MM-DD'
});
});
});

$('.datetimepicker').datetimepicker({
timepicker: false,
format: 'Y-m-d',
closeOnDateSelect: true,
scrollInput: false
});

The problem is your jQuery selector, you should use $('[data-provide="datepicker"]') instead of $('.datepicker') or add a datepicker class to your input.
Here a working example:
$('[data-provide="datepicker"]').datetimepicker({
format: 'YYYY-MM-DD'
});
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.css" rel="stylesheet"/>
<link href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.37/css/bootstrap-datetimepicker.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.37/js/bootstrap-datetimepicker.min.js"></script>
<div class="col-sm-6">
<div class="input-group date" data-provide="datepicker">
<input type="text" class="form-control" id="repdate" name="repdate" placeholder="Report date" required>
<div class="input-group-addon">
<span class="glyphicon glyphicon-th"></span>
</div>
</div>
</div>

In your jQuery code, it uses a datepicker class but you are not using it correctly. You should use it like below
<div class="col-sm-6">
<div class="input-group date datepicker">
<input type="text" class="form-control" id="repdate" name="repdate" placeholder="Report date" required>
<div class="input-group-addon">
<span class="glyphicon glyphicon-th"></span>
</div>
</div>
</div>
Anyway, you do not have to use the same format in your database as you can update the date on your backend code with the proper database format later.

Bootstrap-Datepicker not working properly

My bootstrap-datetimepicker is not working properly
This question has been asked a lot of times here, but the answers from here, here and here and manny others didn't help me further...
at the top of my webpage in the<head> i'm including:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.6.4/js/bootstrap-datepicker.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
and then in my form i want to call him like this:
<div class="col-md-4">
<label class="control-label" for="birthday">Birthday:</label>
<div class="form-group">
<div class='input-group date' id='datetimepicker'>
<input type='text' class="form-control" placeholder="dd/mm/yyyy" value="" />
<span class="input-group-addon">
<span class="glyphicon glyphicon-calendar"></span>
</span>
</div>
</div>
</div>
and at the bottom before the </body> tag there is the javascript/jquery part:
<script type="text/javascript">
$('#datetimepicker').datepicker();
</script>
What am i doing wrong ? Can someone correct my mistakes ?

i've read that bootstrap datepicker requires jquery 1.7.1 and up
check this fiddle im using jquery 1.9.1
<div class="col-md-4">
<label class="control-label" for="birthday">Birthday:</label>
<div class="form-group">
<div class='input-group date' id='datetimepicker'>
<input type='text' class="form-control" placeholder="dd/mm/yyyy" value="" />
<span class="input-group-addon">
<span class="glyphicon glyphicon-calendar"></span>
</span>
</div>
</div>
</div>

Try wrap plugin initialization in document ready function.
<script type="text/javascript">
$(document).ready(function() {
$('#datetimepicker').datepicker();
});
</script>