jQuery submit for two buttons - javascript

I have a basic form popup that will display when the button buy now of the main product is clicked with this code: onclick="productAddToCartForm.submit(this)"
and i have related products too in the same page with this main product with exactly the same button, and i want this pop up to be displayed also when it's clicked, and i tried to add onclick="productAddToCartForm.submit(this)" to it too but if i push it the pop up WILL work but will add to the CART both products.
how can i do this?
the code looks like this:
<div style="display: none;" id="ajax-popup">
<span class="button b-close"><span>X</span></span>
<h2 id="ajax-popup-message"></h2>
<div id="ajax-popup-content"></div>
</div>
<script type="text/javascript">
//<![CDATA[
var productAddToCartForm = new VarienForm('product_addtocart_form');
productAddToCartForm.submit = function(button, url) {
if (this.validator.validate()) {
var form = this.form;
var oldUrl = form.action;
if (url) {
form.action = url;
}
var e = null;
// Start of our new ajax code
if (!url) {
url = jQuery('#product_addtocart_form').attr('action');
}
url = url.replace("checkout/cart","ajax/index"); // New Code
var data = jQuery('#product_addtocart_form').serialize();
data += '&isAjax=1';
jQuery('#ajax_loader').show();
try {
jQuery.ajax( {
url : url,
dataType : 'json',
type : 'post',
data : data,
success : function(data) {
jQuery('#ajax_loader').hide();
//alert(data.status + ": " + data.message);
jQuery('#ajax-popup-message').addClass(data.status);
if(jQuery('#ajax-popup')){
jQuery('#ajax-popup-message').html(data.message);
}
if(jQuery('#ajax-popup')){
jQuery('#ajax-popup-content').html(data.sidebar);
}
if(jQuery('.header .links')){
jQuery('.header .links').replaceWith(data.toplink);
}
jQuery('#ajax-popup').bPopup();
}
});
} catch (e) {
}
// End of our new ajax code
this.form.action = oldUrl;
if (e) {
throw e;
}
}
}.bind(productAddToCartForm);
productAddToCartForm.submitLight = function(button, url){
if(this.validator) {
var nv = Validation.methods;
delete Validation.methods['required-entry'];
delete Validation.methods['validate-one-required'];
delete Validation.methods['validate-one-required-by-name'];
// Remove custom datetime validators
for (var methodName in Validation.methods) {
if (methodName.match(/^validate-datetime-.*/i)) {
delete Validation.methods[methodName];
}
}
if (this.validator.validate()) {
if (url) {
this.form.action = url;
}
this.form.submit();
}
Object.extend(Validation.methods, nv);
}
}.bind(productAddToCartForm);
//]]>
</script>
HTML looks like this:
<div class="main">
<div class="first">
<div class="add-to-cart">
<img onclick="productAddToCartForm.submit(this)" title="Add to Cart" src="../images/add-to-cart.png">
</div></div>
//STUFF
<div class="second">
<button onclick="window.location='URL'; productAddToCartForm.submit(this)" class="form-button add-to-cart" type="button"></button></div>
</div>

The root of your issue is, from what I can see from your example, that you are calling the form submission function twice. It appears that the second onclick had debug code with the window.location left in it when you pasted it here, of which is, what I can only determine from your description, the popup window markup that causes an endless loop of submitting items to the cart.
Firstly you're using jQuery to make programming with Javascript easier, get rid of the onclick= DHTML events in your html and use jQuery.
then add
jQuery(document).ready(function(){
jQuery('.add-to-cart').click(function(e){
e.preventDefault();
productAddToCartForm.submit(this);
});
});
Secondly there's no reason to wrap jQuery.ajax in a try catch, it has it's own error processing functionality. Unless you believe something would be wrong with jQuery's ajax function. Otherwise if you are trying to catch errors within the success method, you need to place the code inside the success method.
Think of ajax as a completely separate browser being opened up the instant it is executed.
Here's an example of what I am referring to: http://jsfiddle.net/73gpC/1/
Here's an example of an error method:
jQuery.ajax({
error: function(jqXHR, text, errorThrown){
if(errorThrown){
alert('Error: ' + errorThrown);
}
}
});
Next you have already declared the form with var form = this.form;, why search the DOM for it again?
jQuery('#product_addtocart_form').serialize();
should be form.serialize();
Every time you execute jQuery('selector'), jQuery "searches" for the element within the DOM.
While it sounds okay at first, as you begin dealing with more complex applications it is extremely slow to do things this way while the user interacts with your application.
It is much faster to use the declared variable instead since you already found it. With that said always favor ID's over class names as they are much faster to find but require valid HTML (ID's are unique and can not be reused).
From the look of it <button onclick="window.location='URL'; productAddToCartForm.submit(this)" is just completely broken and you are expecting it do something it simply won't because window.location='URL' is going to redirect the users browser to 'URL' when they click it and productAddToCartForm.submit(this) will never execute.
Example: http://jsfiddle.net/CZqDL/
No alert box will be displayed on click, indicating the function never fired.
I am all for helping someone learn how to figure out an issue if I am able, but this is really beyond your experience level with Javascript or jQuery in general.
I suggest getting a jQuery programming book or hiring a developer to program it correctly.
Especially seeing as how VarienForm is a part of Magento, which should be listed in your tags, which is an eCommerce application.
If you're just learning I suggest reaching out on the jQuery or Magento forums on how to use the applications or possibly for training.
Otherwise you will lose customers, get incorrect orders, or possibly be sued or arrested (depending on if you are processing credit cards) should your form mess up due to poor programming practices.
There are many websites where you can hire a freelancer to do just what you need for very low costs and avoid the hassles.

Related

AJAX call to differrent page in same domain works, but does not load everything

So, a little context: I'm trying to do an ajax call to a webpage in the same domain to get a telephone number to show up as soon as I specify the client on the first page. I do get the data but it seems like not the whole page is loaded in.
I need this:
<div id="1">
<div id="2">
<a id="ineedthis"></a>
</div>
</div>
but instead it's giving me this:
<div id="1">
</div>
This is a website that I'm writing a script for, since I can't edit the source code. This is managed from our ERP program and is pretty limited in customizability.
My best guess is that the target webpage is also still loading in the information from the database, but my ajax call returns the webpage before that happens.
Here is my js code:
function updateClasses(){
var link = $('a[href^="/organisatie-beknopt-prs?BcId="]');
var href = "https://52134.afasinsite.nl" + link.attr("href");
console.log(href);
if(href !== "https://52134.afasinsite.nlundefined"){
$.ajax({
url:href,
type:'GET',
success: function(data){
var tel = $(data).find("#P_C_W_Title_Content");
console.log(tel);
}
});
}
}
setInterval(updateClasses, 1000);
I'm running this once per second to check for a change in the input field on the first page, I don't know if there is a better way for this?
Firstly, you could try running the script/function once a change has been detected.
Something along the lines of :
$('input[name="{inputFieldName}"]').on('change',function(){
updateClasses();
});
//You can also use "keyup" instead of "change", depending on the type of action that you are looking for.
For the Ajax, you could try using Promises. Basically, set up the ajax call and then set a ".done" case for the ajax call has been completed and received some result. A ".fail" can also be used to catch non-code related issues.
function updateClasses(){
var link = $('a[href^="/organisatie-beknopt-prs?BcId="]');
var href = "https://52134.afasinsite.nl" + link.attr("href");
var getPhonePromise = $.ajax({
url: href
});
getPhonePromise.done(function(data) {
var tel = $(data).find("#P_C_W_Title_Content");
console.log(tel);
});
getPhonePromise.fail(function(errRes) { console.log(errRes);});
}

Find closest class and reload it AJAX jQuery

This is a "LIKE" system similar to Facebook.
I've got an html layout with multiple links where each one looks something like this when rendered :
<a class="like-comment-link" href="#" data-id="278">
<span class="like-comment"></span></a>
<span class="likes">Bob, John and Peter like this</span>
I'm using AJAX to insert and delete the likes into the database, this is all working great. But I'm having trouble targeting the "likes" class from the ajax script to update the names of the people that liked it.
I basically need something which does the following :
$(this).closest(".likes").find(".likes").load(location.href + " .likes");
I know this doesn't work but I don't know the correct way to code it.
Basically, on a successful like or unlike I need jQuery to find the closest instance of ".likes" to the parent which is ".like-comment-link" and then reload that class only on this element.
EDIT
Including AJAX script
$(document).ready(function(){
$(document).on('click', "a.like-comment-link", function(event) {
event.preventDefault();
var $self = $(this);
var data = {
post_id: $self.data('id'),
nonce: likecom.nonce,
action: 'comment_likes'
};
$self.addClass('loading');
$.post(likecom.ajaxurl, data, function(res) {
if (res.success) {
$self.html(res.data);
$self.siblings(".likes").load(location.href + " .likes");
} else {
alert("It went tits up!");
}
$self.removeClass('loading');
});
});
});
If this is overly complicated I could change target class' name to include the id of the current item like this :
<span class="likes-278">....</span>
But I can't figure out how to concatenate strings in jQuery.
I tried a few things like this :
$(".likes-" + $self.data('id')).load(location.href + " .likes-" + $self.data('id'));
But that obviously didn't work.
Maybe somebody could show me how to correctly formulate this in the AJAX script?
You may try something like this. Since the span is always after the anchor element in your example, you may also use .next() function to locate the element
$('.like-comment-link').on("click",function()
{
if($(this).next("span").hasClass("likes"))
{
$(this).next("span").removeClass("likes");
$(this).next("span").addClass("nolikes");
// Write value to db
}
else
{
$(this).next("span").removeClass("nolikes");
$(this).next("span").addClass("likes");
// Write value to db
}
});
http://jsfiddle.net/3k0vLdt4/3/
Hope it helps doing what you want to do.

javascript doesnt work on a link

I have got this html:
<a style="display:block; padding:100%; text-decoration: none;" href="http://google.com " class="Jasmin" id="target_site_to_visit">
<span data-app-id="88" class="btn" id="visit_site" style="right:22px; top:65px; padding:5px;z-index: -99999;">VISIT SITE</span>
</a>
and this jquery:
(function($){
$('#target_site_to_visit').live('click',function(event){
event.preventDefault();
var appName=$('#target_site_to_visit').attr('class');
$.post('db/update_site_viewed.php',{ name:appName }, function(data){
throw new Error("AppName: "+appName);
},'html').error(function(data){
throw new Error("Error: "+data.responseText);
});
document.location.href=$('#target_site_to_visit').attr('href');
}); })(jQuery);
A problem exists, whenever the button is clicked.. the post method is executed which puts the data into the database. But that only happens when the last line in jquery doesnt exist: document.location.href.. the redirection effects the post somehow..and doesnt probably doesnt give the post method to execute..resulting in no record being inserted to the db (or in other post method doesnt execute).. is it possible that that is the cause..cause the redirection does effect the execution of the post method
This will solve your problem
<script type="text/javascript">
$('#target_site_to_visit').live("click",function(event){
event.preventDefault();
var appName=$('#target_site_to_visit').attr('class');
$.post('db/update_site_viewed.php',{ name:appName }, function(data){
// console.log("AppName: "+appName);
},'html').error(function(data){
// console.log("Error: "+data.responseText);
});
// document.location.href=$('#target_site_to_visit').attr('href');
});
But use .on() instead of .live().LIke
<script type="text/javascript">
$(document).on("click",'#target_site_to_visit',function(event){
event.preventDefault();
var appName=$('#target_site_to_visit').attr('class');
$.post('db/update_site_viewed.php',{ name:appName }, function(data){
// console.log("AppName: "+appName);
},'html').error(function(data){
// console.log("Error: "+data.responseText);
});
// document.location.href=$('#target_site_to_visit').attr('href');
});
</script>
You need to pass the event to listen for (in this case click) to the live method.
$("#somediv").live("click", function () {
console.log("you clicked it");
});
Also, as the other answerer said, you should use on as opposed to live, here is an article that explains why: http://bitovi.com/blog/2011/04/why-you-should-never-use-jquery-live.html
You don't appear to have specified the type of event. It should be 'click', and if my extremely limited knowledge of jQuery syntax is correct, it should be the first parameter before your callback.
To be on the safe side, I like to have any link that is intended to be handled by JavaScript have href="javascript:void(null);". That way, even if the event handler fails to cancel the event, nothing will happen anyway. It's also less confusing for the users to see a JavaScript link in their status bar when you hover over it, than a link to Google.

jQuery Modal Confirmation Dialog Not Submitting Form

I am trying to pop up a confirmation modal when the user presses the delete button on the edit form. The modal pops up fine, but when jQuery should be submitting the form, it's not doing anything. I have delete as a type="button", because when it is of type submit the modal function does not hold up the process and it just deletes the user right away.
The HTML ...
-- EDIT --
(I added the <form> tags)
<form action="/admin/edit-user" enctype="application/x-www-form-urlencoded" method="post" name="edit_user_form" id="edit_user_form">
...
<p><input type="submit" value="Save" name="submit" id="submit"/></p>
<p><input type="submit" value="Cancel" name="cancel" id="cancel"/></p>
<p><input type="button" value="Delete User" name="delete_btn" id="delete_btn" onclick="confirmDeleteUser();"/></p>
...
</form>
...
<div id="dialog-modal" title="Confirm Delete User">
<p><span class="ui-icon ui-icon-alert" style="float:left; margin:0 7px 0 0;"></span> Are you sure you wish to delete this user?</p>
<p>To continue editing, click cancel.</p>
</div>
The Javascript:
function confirmDeleteUser()
{
$('#dialog-modal').dialog({
autoOpen: false,
width: 400,
modal: true,
resizable: false,
buttons: {
"Cancel": function() {
$(this).dialog("close");
return false;
},
"Delete User": function() {
var self = $(this);
var form = $('#edit_user_form');
tmpElm = $('<input type="hidden" />');
tmpElm.attr('name', 'delete');
tmpElm.attr('id', 'delete');
tmpElm.val(true);
tmpElm.appendTo(form);
form.submit();
return true;
}
}
});
$('#dialog-modal').dialog('open');
}
When I inspect the source, I'm seeing that the code is properly appending the new hidden element, but the submit just doesn't seem to want to fire. What step am I missing?
Try it a different way.
HTML
Your html has the following: onclick="confirmDeleteUser();"
Why? jQuery is supposed to make this easier for you, not harder.
Your HTML should be pure and not calling functions (with the exception of ultra-extreme circumstances you are very unlikely to encounter). Why not use the jQuery library to bind the event to the element, rather than mix javascript function calls into your HTML? You should be doing something like this in the <script> tags, after a document ready statement.
$("#delete_btn").click(function(e){
/*Code that runs on click of the "delete_btn" ID tag*/
});
If you're unfamiliar with jQuery selectors and events then start reading here.
You can find all the events here.
You can find all the selectors here
The other reason you should do this is in the event the document isn't correctly/fully loaded in order to prevent it from breaking on your users.
CSS
You've also done this: style="float:left; margin:0 7px 0 0;" in an HTML tag? That's evil, dude. Just evil. How am I going to maintain this code in five months?
Instead, use CSS.
In your tags, or CSS file, you need an entry such as:
.dialogAdjust {
float: left;
margin: 0 7px 0 0;
}
Then in your HTML you would say:
<span class="ui-icon ui-icon-alert dialogAdjust"></span>
And now you can tweak the thing to your heart's content. It's better if you can make the class on the dialog div, rather than individual HTML elements, and in this case you absolutely can.
JavaScript
Hokay, so, here's your function:
function confirmDeleteUser()
{
$('#dialog-modal').dialog({
autoOpen: false,
width: 400,
modal: true,
resizable: false,
buttons: {
"Cancel": function() {
$(this).dialog("close");
return false;
},
"Delete User": function() {
var self = $(this);
var form = $('#edit_user_form');
tmpElm = $('<input type="hidden" />');
tmpElm.prop('name', 'delete');
tmpElm.prop('id', 'delete');
tmpElm.val(true);
tmpElm.appendTo(form);
form.submit();
return true;
}
}
});
$('#dialog-modal').dialog('open');
}
What's going on here? First step, you should try and use a tool to measure code quality. Two popular ones are JSHint and JSLint. You don't need to follow things they say like it's the only way to write your code, but it's immensely helpful in finding bugs due to small mistakes. I like JSHint, so we're going to run it through that.
And here's the output:
Errors:
Line 17 tmpElm = $('<input type="hidden" />');
'tmpElm' is not defined.
Line 18 tmpElm.attr('name', 'delete');
'tmpElm' is not defined.
Line 19 tmpElm.attr('id', 'delete');
'tmpElm' is not defined.
Line 20 tmpElm.val(true);
'tmpElm' is not defined.
Line 21 tmpElm.appendTo(form);
'tmpElm' is not defined.
Oops. Looks like you've got an undefined variable in there, meaning it's now global. Global variables are bad, they break scope and can make your code function in strange ways.
We need to fix that. You should always declare local variables in local scope. That means putting a var tempElm; at the top of the "Delete User" function.
Do away with that function wrapper, you won't need it. Your code should create the dialog object and code when the document is done loading, and open the dialog when it's clicked. What is happening in your original code both creating the dialog and opening it every time you click that button. What's the problem with that? You keep creating the object, even though it's created. You're creating the same object again and again and again. In this implementation, you won't notice it, but your design will carry over to places it will unless you take notice of this now.
So, what does that look like? In your <head> tag you should see something like this:
<script>
/*
This makes all the code inside
run when the window is done loading,
not before, which may cause issues.
*/
$(window).load(function(){
/*
This sets up the dialog
as you've described before
*/
$('#dialog-modal').dialog({
autoOpen: false,
width: 400,
modal: true,
resizable: false,
buttons: {
"Cancel": function() {
$(this).dialog("close");
return false;
},
"Delete User": function() {
var self = $(this);
var form = $('#edit_user_form');
//We've added the var infront of tepElem
var tmpElm = $('<input type="hidden" />');
tmpElm.prop('name', 'delete');
tmpElm.prop('id', 'delete');
tmpElm.val(true);
tmpElm.appendTo(form);
form.submit();
return true;
}
}
});
/*
This is the part where I talked
about selectors and events in the HTML
*/
$("#delete_btn").click(function(e){
$('#dialog-modal').dialog('open');
});
});
</script>
When asking for help, use a tool like jsFiddle to post JavaScript in to make it easier for other people to help you.
Here's a jsFiddle of the revisions we've made so far. Spend a bit of time learning how to use it if you're doing a lot of work in JavaScript and want to test something really quickly.
Here's why I wanted you to learn jsFiddle:
You didn't give us enough code to work with successfully, thus leading to me writing this huge post about code quality and how to ask questions, doubly so when you post a bounty.
If you want help, don't make people work really hard for it. You won't get good help unless someone is totally insane.
jsFiddle requires you post actual working code (or non-working code) that lets us see if there's a problem with form.submit(), such as any strange attributes or properties on the form element, or any number of other issues that could be kicking around that you excluded.
So let's look at what's breaking your "Delete User" function.
function() {
var self = $(this);
var form = $('#edit_user_form');
tmpElm = $('<input type="hidden" />');
tmpElm.prop('name', 'delete');
tmpElm.prop('id', 'delete');
tmpElm.val(true);
tmpElm.appendTo(form);
form.submit();
return true;
}
Why have you declared self? You never use it once. Lets get rid of that.
You could use something called chaining, it's really up to you. Some people hate it.
You append a whole new input to the form for something that looks like a choice, I'm not sure this is wise. I'd suggest changing the value of a normal input, or using another pattern, this could lead to a lot of issues, but for the sake of the question I'll imagine it's done for all the right reasons. Be careful however, if someone double clicks submit, that input's in there two times.
form is a word reserved by used in the DOM, you should avoid using that one to avoid confusion between your variable and the DOM API.
Which form submission button are we clicking here? You have a lot, and jQuery isn't going to guess and hope for the best.
How forms should look:
The w3 explains what forms are and the purpose of things.
Key points:
Names are paired with values
The submit button clicked is sent, the submit buttons not clicked are not.
The DOM is can be navigated based on NAME and ID attributes
Something weird is going on in your form.
Here's a form that javascript understands how to submit:
http://jsfiddle.net/YS8uW/2/
Here's javascript attempting to submit your form (stripped down to bare-bones):
http://jsfiddle.net/LfDXh/
What's different here?
You have IDs all over the place.
You use keywords for names
Lets look at something you've done, given an ID of submit to something:
http://jsfiddle.net/fdLfC/
And what happens when we don't use that as an ID?
http://jsfiddle.net/fdLfC/1/
Ahh. So that's weird.
It's like giving it an id of submit won't let you call submit. A proper explanation is, you've re-written it because the dom did it when you assigned that ID and Name, it's trying to call the element.
You can see this if you open up a debugger or something, it gives you an alert to the effect of:
TypeError: Property 'submit' of object # is not a function
Keep away from using keywords to mean something else and you won't fall into these weird traps.
A big thank you to #MattMcDonald for linking me to this resource, which explains how to deal with, and why, NAME and ID attributes over-write the built-in HTML DOM methods.
Do the other stuff I said too. Disclaimer: Everyone's going to wage war on me saying it's not absolute that you should be doing all those things, I agree, but I think this post is long enough, and we'll all agree that doing these things is a step forward in code quality, not backwards. It's up to you at the end, but try avoiding mixing things together into a huge messy pot. Think about the execution of your code and how it's happening also.
If you are sure it appends the hidden input, then the problem must be in using duplicate ID.
The button and the hidden input have the same ID. Make them different and try again.
Dont ask me the reason why it worked, all i can tell you is after doing this and that and tearing each part of your code, finally i made it work. click below link to see the demo
http://jsfiddle.net/praveen_prasad/KaK5A/4/
The changes i made are: removed id and name attributes from submit buttons from form
Example:
<input type="submit" value="Save" name="submit" id="submit"/>
changed above to below
<input type="submit" value="Save" />
Note For JsFiddle Demo: when you will click delete user on modal, form will submit. jsfiddle will say "Error 404", as it wont find the link you are posting your form. Open firebug and see that its actually posting to correct url.
"Delete User": function() {
var self = $(this);
var form = $('#edit_user_form');
tmpElm = $('<input type="hidden" />');
tmpElm.attr('name', 'delete');
tmpElm.attr('id', 'delete');
tmpElm.val(true); // HERE ----------------
tmpElm.appendTo(form);
form.submit();
return true;
}
At the designated location, shouldn't it be :
tmpElm.value(true);
or
tmpElm.attr('value', 'true');
I find it less confusing to handle my form submits upon confirms via jQuery ajax with serialized form values. It has the added benefit of avoiding unwanted form submits from buttons inside the <form> tags. So, it would look something like this:
<form id="edit_user_form">
...
<button id="submit_btn">Submit</button><br />
<button id="cancel_btn">Cancel</button><br />
<button id="delete_btn">Delete</button>
...
</form>
And then the javascript:
$('#delete_btn').click(function() {
$('#dialog-modal').dialog({
autoOpen: false,
width: 400,
modal: true,
resizable: false,
buttons: {
"Cancel": function() {
$(this).dialog("close");
return false;
},
"Delete User": function() {
$.ajax({
url: "/admin/edit-user",
type: "POST",
data: $('#edit_user_form).serialize(),
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("An error has occurred: " + errorThrown);
},
success: function(){
//Notify of success, redirect, etc.
}
});
}
}
});
});
So, it still submits via a POST. It now can happen asynchronously (or not) You can "do things" on success without changing the page, or alternatively redirect as you might need. I use a "dispatcher" page to submit to my object oriented framework, which then returns the output back to the PHP dispatcher to be json_encoded and echoed as a string for the AJAX call to use on success. Using this pattern, I only have to have one page that spits out plain text and the rest can reside in my OO Classes, which can't be called directly by ajax without doing some serious clooging (by using xajax)

Popup using jQuery?

I'm trying to do a pretty simple thing, I believe. I need to popup a success confirmation dialog after a user clicks to add someone to his friends list. Simply there's an add link on the page with the url (mysite.com/add/friendname). I needed to make issue this request asynchronously so I used jQuery.ajax built-in function to send the request. Take a look at the following code:
$(document).ready(function() {
$('.track_links').click(function() {
if (confirm("are you sure you want to track <firstname lastname>?")) {
$.ajax({
type: "GET",
url: this.href,
success: function() {
alert("Congratulation! you're now tracking <firstname lastname>");
},
error: function() {
alert("Oops! An error occured, plz try again later!");
}
});
return false;
}
else {
return false;
}
});
});
Now, here's what I need to do in short:
1- I need to use an already designed Html form as the success or failure confirmation message, instead of just alerting!
2- I also need to replace a placeholder (###username###) on that html page with the actual user name (firstname space lastname) which is the value of another field on the document. How to manipulate this html before poping it up on the client?
p.s: My Html/Javascript skills is totally awesome ;) (well, not really)!
For the first part
You can use the
show
function to show a div in the ajax success function.
$("#divResult").show();
if divResult is the id of the div to be shown
For the second part
you can get the value of first name and last name using
$("#txtFirstname" ).val();
and
$("#txtLastname" ).val();
if your first name text box id is txtFirstname and last name text box id is txtLastName
This is how I setup an Acknowledgement dialog, which could quickly be modified to be a confirmation for an action like yours.
http://professionalaspnet.com/archive/2009/06/02/Displaying-a-Confirmation-Dialog-with-the-JQuery-UI-Dialog.aspx
For the Form, I would suggest the html() Method, which injects raw HTML you have to provide. Since you already have it, you can give it to the Method via parameters.
For the Placeholder Part, I would suggest the val() Methods, coupled with Javascript's built-in regex functions.
If your placeholder is "###firstname###", then you should try something like
var firstname = jQuery('input#firstname').val();
var lastname = jQuery('input#lastname').val();
var text = jQuery('span#ThePlaceMyPlaceholderIsAt').text();
text = text.replace(/\#\#\#firstname\#\#\#/,firstname);
text = text.replace(/\#\#\#lastname\#\#\#/,lastname);
jQuery('span#ThePlaceMyPlaceholderIsAt').text(text);

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