Develop Reference

Jquery not detect click after append of element

i've made a sortable list with html5sortable library, where user have a category, where can add products inside, and can add other categories where to add products too.
The first one category is already displayed, and work fine when adding products, but if I add another category I can't add product on this category.
I've tried with "on" method instead of "click", as it should work on element created dinamically, but I think I'm using it in the wrong way.
Here is the HTML
<div class="container-categorie">
//THIS IS A CATEGORY ITEM, WITH ADD PRODUCT BUTTON INSIDE
<div class="category" id="categoria-1">
<input type="text" class="input-categoria" placeholder="NAME CATEGORY" autofocus="autofocus">
<div class="list" id="list-1">
//products will be added here
</div>
<div class="item-products add-product-container">
<div align="center" class="add-product-btn" id="addproduct-1">
+ add product
</div>
</div>
</div>
//END OF CATEGORY ITEM
<div class="add-categoria-container">
Nuova categoria
</div>
</div>
And here is the js code:
var i = 2;
$(".categoria").on('click', function() {
//to delegate the click I applied this event to "add product" button's container
});
//This add a product inside category div
$(".add-product-btn").click(function() {
var id_btn = $(this).attr("id");
var single_id = id_btn.substring(id_btn.indexOf("-") + 1);
$("#list-"+single_id).append('<div class="item-products">prova</div>');
sortable('.list');
});
//This should add a new category inside "container-categorie", with an "add product"
//button inside, to add products inside this new category
$(".add-categoria-container").click(function() {
$(".sortable-categorie").append('<div class="categoria"><input type="text" class="input-categoria" placeholder="NOME CATEGORIA PRODOTTI" autofocus="autofocus"><div class="list" id="list-'+i+'"></div><div class="item-products add-product-container"><div align="center" class="add-product-btn" id="addproduct-'+i+'">+ Aggiungi prodotto</div></div></div>');
sortable('.sortable-categorie');
});

Jquery can't listen to dynamically generated Elements directly, what you can do is you can provide parent element which is already there in DOM listen to them.
$("element which is already in DOM").on('click',"element to listen to", function() {
//Code here
});
$(".container-categorie").on('click',".categoria", function() {
//Code here
});
or you can directly listen to the body instead, but it is not preferable.
For Ref : https://api.jquery.com/on/#on-events-selector-data-handler

Try this
$(document).on('click',".your_class_name", function() {
//to delegate the click I applied this event to "add product" button's container
});

JQuery has no virtual DOM like Angular or React. That means JQ can't "see" the dynamically generated element. What you can do is using a onclick="functionYouWantToTrigger(someParameters)" directly in the HTML tag.

How to copy an input element with its value?

I have simple textboxes generated by AJAX.
<input type='text' id='txt1' name='txt1_nm' />
What I'd like to do, when I press a button. The input is all copied inside a different div with its new value inserted by user.
I use
$('#txt1').html();
but, the value is not copied only the textbox

You need to make use of clone() so that you get the element with its value. Type anything in the textbox in the snippet below and press the Copy button.
//detect the click of the copy button
$('#copyBtn').click(function(){
//get the clonned element
var inputElement = $('#txt1').clone();
//add clonned element to a new div
$('#copiedDiv').html(inputElement);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
<input type='text' id='txt1' name='txt1_nm' />
</div>
<div id='copiedDiv'></div>
<button id='copyBtn'>Copy</button>
If you want to add multiple cloned items then you will require to change the id of the input element and then append that to the page. You can do like this to achieve it,
//detect the click of the copy button
$('#copyBtn').click(function(){
//get the last input item
var $inputEl = $('input[name="txt1_nm"]:last');
//get the next id number
var num = parseInt( $inputEl.prop("id").match(/\d+/g), 10 ) +1;
//clone and set a new id for this element
var $cloneEl = $inputEl.clone().prop('id', 'txt'+num );
//add clonned element to a new div
$('#copiedDiv').append($cloneEl);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
<input type='text' id='txt1' name='txt1_nm' />
</div>
<div id='copiedDiv'></div>
<button id='copyBtn'>Copy</button>

$(document).on('click','#myBtn',function(){
value=$('#txt1').val();
$('#myDiv').empty();
$('#myDiv').append($('#txt1').clone());
$('#txt1').val("");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='text' id='txt1' name='txt1_nm' />
<button type="button" id="myBtn">Click Me</button>
<div id="myDiv"></div>

You can simply use:
$('#txt1').clone()
It will perform a deep clone of that element with all of its content.
NOTE: Cloning an element will also duplicate its ID if it has one.
You should change any ids to classes beforehand.
This is from the documentation:
Note: Using .clone() has the side-effect of producing elements with duplicate id attributes, which are supposed to be unique. Where possible, it is recommended to avoid cloning elements with this attribute or using class attributes as identifiers instead.

Why isn't jQuery append method working when passing parent class to add a child input?

I want to append a duplicate of an input box in a parent box. Here is my HTML structure:
<div class="reading-group input-group">
<input type="text" placeholder="Enter Reading link" id="link">
</div>
+ Add another link
And here is my jQuery code:
function addPlaceholder(parentClass){
var placeHolder = $(parentClass).children().eq(0);
$(parentClass).append(placeHolder);
console.log(placeHolder);
}
$('.add-reading-btn').click(function(){
addPlaceholder('.reading-group');
});
Here is the jsfiddle link: https://jsfiddle.net/abhishekraj007/kexe6gxn/
What am I doing wrong?

Your code is taking the existing <input> element and moving it from the <div> and back into the <div>, so it looks like nothing is happening. If you .clone() the element and then .append() it, a new element will be added.
Here is a working example:
function addPlaceholder(parentClass) {
var placeHolder = $(parentClass).children().eq(0).clone();
$(parentClass).append(placeHolder);
console.log(placeHolder);
}
$('.add-reading-btn').click(function() {
addPlaceholder('.reading-group');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="reading-group input-group">
<input type="text" placeholder="Enter Reading link" id="link">
</div>
+ Add another link
If you want to add focus to your <input> element on load, you can do so by adding this line to the bottom of your code:
$('#link').focus();
If you want to add focus to the new element on creation, as well as give it an empty value rather than copying the prior element's value, add this line to the end of your addPlaceholder() function:
$(placeHolder).val("").focus();

you can just add the .clone() method of jquery to create a clone of the textbox like below . You were only referring to the same element not the cloned html before.
$(document).ready(function(){
function addPlaceholder(parentClass){
var placeHolder = $(parentClass).children().eq(0).clone();
$(parentClass).append(placeHolder);
//console.log(placeHolder);
}
$('.add-reading-btn').click(function(){
addPlaceholder('.reading-group');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="reading-group input-group">
<input type="text" placeholder="Enter Reading link" id="link">
</div>
+ Add another link
Here is a working fiddle
https://jsfiddle.net/kexe6gxn/2/

Getting the last element of a form jquery

I am a beginner in programming and am stuck in a problem. I want to find the last child (element) of parent (form). Then I want to insert an input element after the last child but it should be inside the form not after the form (outside). The form might contain input elements as well as select elements. How to accomplish it? I have tried the following ways but they don't work unfortunately.
var lastRepeatingGroup = $('.form-to-be-submitted:last'); // this one gives me the whole form meaning if I add something it will added at the end of the form
var lastRepeatingGroup = $('.form-to-be-submitted input:last'); //this gives me the last input element
var lastRepeatingGroup = $('.form-to-be-submitted input select').last(); //this does nothing, I think its an error
$newSection = $('<input type="button" value="newbutton" name="mybutton"/>');
newSection.insertAfter(lastRepeatingGroup); // when I use this statement it adds after the form not inside the form

So you just need some guidance on CSS Selectors and Jquery methods.
First lets look at:
The form might contain input elements as well as select elements.
So in CSS to do an or you need to use a comma:
input,select
if you are looking for direct descendants you need to use a >
form > input, form > select
These are then wrapped in jquery:
$('form > input, form > select')
Which yields all items, so we use last() to grab the last element:
var $last = $('form > input, form > select').last();
(if you don't need the > just remove it).
This was pretty close:
var lastRepeatingGroup = $('.form-to-be-submitted input select').last();
but it's looking for a select element in a input element in that class. Just needs a little adjustment:
var lastRepeatingGroup = $('.form-to-be-submitted input, .form-to-be-submitted select')
.last();
If you want to insert the element at the end of a specific element, you don't need to find the last item. Just use jquery's append
Except:
Consider the following HTML:
<h2>Greetings</h2>
<div class="container">
<div class="inner">Hello</div>
<div class="inner">Goodbye</div>
</div>
You can create content and insert it into several elements at once:
$( ".inner" ).append( "<p>Test</p>" );
Each inner element gets this new content:
<h2>Greetings</h2>
<div class="container">
<div class="inner">
Hello
<p>Test</p>
</div>
<div class="inner">
Goodbye
<p>Test</p>
</div>
</div>

This should work:
$('.form-to-be-submitted').children().last()
.children() will select all the children in your form and .last() filters that further to only select the last child.
And to insert content after that element, just use .after() like:
$('.form-to-be-submitted').children().last().after('<input>')
Example:
$('.form-to-be-submitted').children().last().after('<input type="radio">')
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form class="form-to-be-submitted">
<input type="text">
<input type="radio">
<input type="checkbox">
<select>
<option></option>
</select>
</form>

JQuery not needed. To insert a new element just before the end of the form, simply use .appendChild().
var frm = document.getElementById("theForm"); // Get reference to form
// Create a new element and configure it
var newElement = document.createElement("input");
newElement.id = "txtUser";
// Simply append it to the form.
frm.appendChild(newElement);
console.log(frm.elements[frm.elements.length-1]); // Get last element in form
<form id="theForm">
<input type="text">
<select>
<option>one</option>
<option>two</option>
<option>three</option>
</select>
<button type="button">Click Me</button>
</form>

Dynamic add divs to html using js

I am trying to add html divs( with textfields) using button click.My form look like this :
On add size button click it add one row (Price and size ) and one add More item button click i want to add new area with name,price and size and so on.
HTML Code is :
<div class="clearfix"></div>
<div class="moreitems form-group" style="border:1px solid #ccc;height:200px;display:none;">
</div>
My js code is :
jQuery("#addmoreitems").click(function () {
var options = jQuery("#select1").html();
jQuery('.moreitems').css("display","block");
var fld = '<div class="clearfix"></div><div class="form-group"><div class="col-sm-3"><label for="" class="text-left control-label">Product Name :</label></div><div class="col-sm-4"><input type="text" class="required-entry form-control" name="pname[]" id="pname"></div></div></div>';
fld += '<div class="clearfix"></div><div class="form-group"><div class="col-sm-3"><label for="" class="text-left control-label">Price :</label></div><div class="col-sm-4"><input type="text" class="required-entry form-control" name="more_prices[]" id="prices"><select name="more_size[]" class="mysize">'+options+'</select></div></div>';
fld += '<div class="col-sm-4"><div class="col-sm-3" style="margin-top:15px;"><button type="button" id="addsize" class="btn btn-info">Add Size</button></div></div>';
jQuery('.moreitems').html(fld);
jQuery('.mysize').html(options);
});
});
But this code add first time.I want to add as many times the add more items button.Also on add more size button want to add price and size fields.

The problem is that you're using html() function which replaces the entire html contents, where in your situation you want to append() the HTML every time you click the button.
Change:
jQuery('.moreitems').html(fld);
To:
jQuery('.moreitems').append(fld);

Hi as i know the may the problem is in appending the using the .html() method.
here the difference between this two methods reference link given
http://www.slideshare.net/umarali1981/jqueryappend-vs-jqueryhtml
cause .html() overwrites the contents of the DIV. while .append() will add to the contents of the DIV. so use this and another thing to notify is that you should bind the 'click' event in-spite of using the only 'click' method like.
$("#addmoreitems").unbind('click').bind('click',function () {
// write your code here
});