Develop Reference

jQuery function doesn't work after after loading dynamic content

I'm using below code. This is bootstrap 3 delete conformation message.
$(document).ready(function(){
$('a.btnDelete').on('click', function (e) {
e.preventDefault();
var id = $(this).closest('div').data('id');
$('#myModal').data('id', id).modal('show');
});
$('#btnDelteYes').click(function () {
var id = $('#myModal').data('id');
var dataString = 'id='+ id ;
$('[data-id=' + id + ']').parent().remove();
$('#myModal').modal('hide');
//ajax
$.ajax({
type: "POST",
url: "delete.php",
data: dataString,
cache: false,
success: function(html)
{
//$(".fav-count").html(html);
$("#output").html(html);
}
});
//ajax ends
});
});
This is the trigger element that I'm using
<div data-id="MYID"><a class="btnDelete" href="#">Delete</a></div>
And I'm using the same HTML element dynamically to trigger delete and it doesn't work.
Can someone point me the correct way to do it?

You have to use event delegation
$(document).on("click" , '#btnDelteYes' ,function () {
Pretty much: bind the click higher up to something that exists when the script is run, and when that something is clicked, tell it to pass the click event to the #btnDelteYes element instead
I cant understand what exactly you are doing on your code due to missing information, but the answer is: you should use event delegation on the dynamically inserted content

you can try
$('[data-id=MYID]').on('click','.btnDelteYes',function({
e.preventDefault();
var id = $(this).closest('div').data('id');
$('#myModal').data('id', id).modal('show');
});
here <div data-id="MYID"> should be a hard coded html content and The idea is to delegate the events to that wrapper, instead of binding handlers directly on the dynamic elements.

jQuery .on not working after ajax delete and div refresh

On a page with a tab control, each tab contains a table, each tr contains a td with a button which has a value assigned to it.
<td>
<button type="button" class="btn" name="deleteEventBtn" value="1">Delete</button>
</td>
This code below works for the first delete. After the AJAX call & the refresh of the div, no further delete buttons can be clicked. The .on is attached to the document. The same happens if I attach it to the body or anything closer to the buttons.
function deleteRecord(url, id, container) {
$.ajax({
type: "POST",
url: url,
data: { id: id },
success: function (data) {
$('#delete-popup').hide();
$(container).trigger('refresh');
}
});
}
$(document).ready(function () {
$(document).on('click', '[name^="delete"]', function (e) {
e.preventDefault();
var id = $(this).val();
$('#current-record-id').val(id);
$('#delete-popup').modal('show');
});
$('#delete-btn-yes').on('click', function (e) {
e.preventDefault();
var recordId = $('#current-record-id').val();
var recordType = location.hash;
switch (recordType) {
case "#personList":
deleteRecord(url, recordId, recordType);
break;
}
});
});
Any ideas? Could it be related to the wildcard for starts with [name^="delete"]? There are no other elements where the name starts with 'delete'.
EDIT
When replacing
$(container).trigger('refresh');
with
location.reload();
it "works", however that refreshes the whole page, loses the users position and defeats the point of using AJAX.

As the button click is firing at first attempt, there is no issue in that code. All you have to do is, put the button click event in a method and call it after the refresh. This way, the events will be attached to the element again. See the code below,
function deleteRecord(url, id, container) {
$.ajax({
type: "POST",
url: url,
data: { id: id },
success: function (data) {
$('#delete-popup').hide();
$(container).trigger('refresh');
BindEvents();
}
});
}
$(document).ready(function () {
BindEvents();
});
function BindEvents()
{
$(document).on('click', '[name^="delete"]', function (e) {
e.preventDefault();
var id = $(this).val();
$('#current-record-id').val(id);
$('#delete-popup').modal('show');
});
$('#delete-btn-yes').on('click', function (e) {
e.preventDefault();
var recordId = $('#current-record-id').val();
var recordType = location.hash;
switch (recordType) {
case "#personList":
deleteRecord(url, recordId, recordType);
break;
});
}

Apologies to all and thanks for your answers. The problem was due to the way the popup was being shown & hidden.
$('#delete-popup').modal('show');
and
$('#delete-popup').hide();
When I changed this line to:
$('#delete-popup').modal('hide');
it worked. Thanks to LShetty, the alert (in the right place) did help!

If you are using Bootstrap Modal
After Ajax Request before Refreshing page add
$('.modal').modal('hide');
This Line will Close your Modal and reload your page. Before that it will complete all Ajax Request things.
But for google chrome there is no issues :) hope this help someone.

Event delegation not working jquery

So I'm just getting started with event delegation and I'm still fairly confused by it but here goes:
I have a button which adds a rating in ajax, once clicked again I'd like it to remove the rating, here's the code with annotations (and some parts removed to make it look more clear).
$(document).on("click", '.add_rating', function() {
l.start();
var input = $(this).prev().children('.my_rating');
var score = input.val();
var what_do = input.attr('action_type');
var cur_average = $('.current_average').val();
var data = {};
data.score = score;
data.media_id = <?php echo $title_data->media_id; ?>;
data.what_do = what_do;
$.ajax({
dataType: "json",
type: 'post',
url: 'jquery/actions/add_remove_rating',
data: data,
success: function(data) {
if (data.comm === 'success') {
//do some other stuff there, irrelevant
$('.ladda-button').removeClass('btn-primary');
$('.ladda-button').removeClass('btn-sm');
$('.ladda-button').addClass('btn-danger btn-xs');
$('.ladda-label').html('Remove');
$('.ladda-button').addClass('remove_rating'); <-- add the remove rating class I want to call if the button is clicked again
input.attr('action_type', 'remove_rating');
l.stop();
}
}
});
$('.remove_rating').on('click', function() { <-- this doesn't work, why?
alert('remove was clicked');
});
});
I can't seem to trigger this:
$('.remove_rating').on('click', function() { <-- this doesn't work, why?
alert('remove was clicked');
});
Any help appreciated!
Edit: on a side note, I don't actually need this to work as php figures out if we're removing or adding a score based on the action_type attribute. I just wanted to find out why it's not triggering.

change your code to:
$(document).on("click", '.add_rating', function() {
l.start();
var input = $(this).prev().children('.my_rating');
var score = input.val();
var what_do = input.attr('action_type');
var cur_average = $('.current_average').val();
var data = {};
data.score = score;
data.media_id = <?php echo $title_data->media_id; ?>;
data.what_do = what_do;
$.ajax({
dataType: "json",
type: 'post',
url: 'jquery/actions/add_remove_rating',
data: data,
success: function(data) {
if (data.comm === 'success') {
//do some other stuff there, irrelevant
$('.ladda-button').removeClass('btn-primary');
$('.ladda-button').removeClass('btn-sm');
$('.ladda-button').addClass('btn-danger btn-xs');
$('.ladda-label').html('Remove');
$('.ladda-button').addClass('remove_rating'); <-- add the remove rating class I want to call if the button is clicked again
input.attr('action_type', 'remove_rating');
l.stop();
$('.remove_rating').on('click', function() { <-- this doesn't work, why?
alert('remove was clicked');
});
}
}
});
});
EXPLANATION:
first have a look here: Understanding Event Delegation.
event delegation is used when you need to create event handlers for elements that do not exist yet. you add a .remove_rating class to elements dynamically, however you are trying to attach a handler to elements with the above mentioned class before you even attach it.
you are attaching the class when the asynchronous ajax call returns, in the success function, however your event handler block is being processed right after you send the ajax, and not after the ajax returns (ajax is async rememeber?). therefore, you need to wait until the ajax returns and the elements are created, and only then attach the handler to them.
alternatively, using event delegation, you can attach the handler to the document, like you did in the following line:
$(document).on("click", '.add_rating', function() {
it means, that you attach the handler to the document, and whenever any element ON the document is clicked, if that element has the class '.add_rating' then execute the handler.
therefore, you may attach another handler to the document to monitor for clicks on elements with the .remove_rating class as follows:
$(document).on("click", '.remove_rating', function() {
this is called event delegation, because you delegate the event to a parent element.

Because class was added after click event initialised. You need to use live event handlers, like this:
$( document ).on('click', '.remove_rating', function() {
In this case .remove_rating click handler will work on dynamically created elements and on class name changes.

jQuery function not attached to dom elements

I am trying build a web page that will construct elements from JSON file and attach click function to those elements.
$(document).ready(function(){
$.ajax({
url: 'database.php',
type: "POST",
dataType: 'json',
success: function (datas) {
(datas);
for (var x = 0; x < datas.data.length; x++) {
var id = datas.data[x].ID;
var ip = datas.data[x].IP;
var ips='<div class="ip"><span id="ids">'+id+'</span><span id="number">'+ip+'</span></div>';
$('#left').append(ips);
}
}
});
$('.ip').click(function () {
alert($(this).children('#ids').text());
});
});
the code above builds the elements successfully but the click function is not working.

You can use the on function instead, it is used to apply event handlers to elements that are not yet created.
Where you have your current click setup, try something like this instead:
$(document).on('click', '.ip', function(){
alert($(this).children('#ids').text());
});
As #Pete has suggested, it is not a good idea to assign the same id attributes within a loop, they should be unique to the document. Consider finding them via class names instead, so you could alert something like:
alert($(this).children('.MyIdsSpan').text());

jquery click event

I have some jquery that looks like this,
$('.career_select .selectitems').click(function(){
var selectedCareer = $(this).attr('title');
$.ajax({
type: 'POST',
url: '/roadmap/step_two',
data: 'career_choice='+selectedCareer+"&ajax=true&submit_career=Next",
success: function(html){
$('.hfeed').append(html);
$('#grade_choice').SelectCustomizer();
}
});
});
My problem is that if the user keeps clicking then the .hfeed keeps getting data appended to it. How can I limit it so that it can only be clicked once?

Use the one function:
Attach a handler to an event for the elements. The handler is executed at most once per element
If you wanted the element to only be clicked once and then be re-enabled once the request finishes, you could:
A) Keep a state variable that updates if a request is currently in progress and exits at the top of the event if it is.
B) Use one, put your code inside a function, and rebind upon completion of request.
The second option would look like this:
function myClickEvent() {
var selectedCareer = $(this).attr('title');
var that = this;
$.ajax({
type: 'POST',
url: '/roadmap/step_two',
data: 'career_choice='+selectedCareer+"&ajax=true&submit_career=Next",
success: function(html){
$('.hfeed').append(html);
$('#grade_choice').SelectCustomizer();
},
complete: function() {
$(that).one('click', myClickEvent);
}
});
}
$('.career_select .selectitems').one('click', myClickEvent);

You can either use a global variable like
var added = false;
$('.career_select .selectitems').click(function(){
if(!added) {
// previous code here
added = true;
}
});
or use .one("click", function () { ... }) instead of the previous click function to execute the handler at most once per element. See http://api.jquery.com/one/ for more details.