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Add removed element back to DOM jQuery 2

I have the following code where I wanna remove and add an element back to the DOM in jQuery:
var pm_container = $(document).find('.pm-container');
$(document).on('change', '#payment-form .cat_field', function(){
displayPrice($(this), pm_container);
});
function displayPrice(elem, pm_container){
$.ajax({
type: 'GET',
url: 'getamount.php',
dataType: 'json',
cache: false,
success: function (data) {
var amount_field = $(document).find('#payment-form #amount');
amount_field.val(data.price);
if(amount_field.val() == 0) {
$(document).find('.pm-container').remove();
} else {
$(document).find('.save-listing').prev(pm_container);
}
}
});
}
For some reason, when the value of amount_field is not equal to zero, my element .pm-container is not added back into my page.
Any idea why?
Thanks for any help.

When you remove the element, it is gone. there is no way to get it back. one solution is to clone the element into a variable and be able to re-use it later:
var pm_container = $(document).find('.pm-container').clone();
$(document).on('change', '#payment-form .cat_field', function(){
displayPrice($(this), pm_container); });
function displayPrice(elem, pm_container){
$.ajax({
type: 'GET',
url: 'getamount.php',
dataType: 'json',
cache: false,
success: function (data) {
var amount_field = $(document).find('#payment-form #amount');
amount_field.val(data.price);
if(amount_field.val() == 0) {
$(document).find('.pm-container').remove();
} else {
$(document).find('.save-listing').prepend(pm_container);
}
}
}); }
However, for your case, Best way could be hiding and showing back the element:
$(document).on('change', '#payment-form .cat_field', function(){
displayPrice($(this)); });
function displayPrice(elem){
$.ajax({
type: 'GET',
url: 'getamount.php',
dataType: 'json',
cache: false,
success: function (data) {
var amount_field = $(document).find('#payment-form #amount');
amount_field.val(data.price);
if(amount_field.val() == 0) {
$(document).find('.pm-container').hide();
} else {
$(document).find('. pm-container').show();
}
}
}); }

First create a variable for your Clone .pm-container outside ajax function
Note*: When you use .remove() you cannot take it back.
var container = $(".pm-container").clone();
then inside your ajax function
if (amount_field.val() == 0) {
$(".pm-container").detach();
} else {
container.insertBefore($(".save-listing"));
}
jsfiddle: https://jsfiddle.net/marksalvania/3h7eLgp1/

Ajax not working properly

Bear with me I'm my javascript is a little rusty. So I'm trying to use a call by ajax to a PHP file and give it a plan type then make sense of it check to see if it then return a true or false if some allowed slots are less than some slots used up for the plan. Here is the Form in XHTML.
<form method="post" action="/membership-change-success" id="PaymentForm">
<input type="hidden" name="planChosen" id="planChosen" value="" />
</form>
On the same file. The ( < PLAN CHOICE > ) gets parsed out to the current plan.
<script>
var hash = window.location.hash;
var currentPlan = "( < PLAN CHOICE > )";
$(".planChoice").click(function(event){
var isGood=confirm('Are you sure you want to change your plan?');
var success;
$("#planChosen").val($(this).data("plan"));
$.ajax({
url: '/ajax/planCheck.php',
type: "POST",
dataType: 'json',
data: ({plan: $(this).data("plan")}),
success: function (data) { //This is what is not working I can't get it to return true
success = data;
}
});
if(success) {
if (isGood) {
$("#PaymentForm").submit();
}
window.location = '/membership-change-success';
} else {
alert('Please make sure you deactivate your listings to the appropriate amount before you Downgrade.')
}
});
My PHP for the ajax response looks like this.
<?php
require ('../includes/common.php');
include_once ('../includes/db-common.php');
require ('../includes/config.php');
$membership = new membership($dbobject);
$listing = new listing($dbobject);
$totalAvailableListings = ($membership->get_listingsAmount($_POST['plan']));
if($totalAvailableListings>=$listing->get_active_listings($user->id)){
echo json_encode(true); // I've tried with out jason_encode too
} else {
echo json_encode(false);
}
And that's pretty much it if you have any suggestions please let me know.
So I've tried to do it another way.
$(".planChoice").click(function (event) {
var isGood = confirm('Are you sure you want to change your plan?');
var success;
$("#planChosen").val($(this).data("plan"));
if (false) {
if (isGood) {
$("#PaymentForm").submit();
alert('you did it');
}
} else {
alert(isSuccessful($(this).data("plan")));
//alert('Please make sure you deactivate your listings to the appropriate amount before you downgrade.');
}
});
and I have an ajax function
function isSuccessful(plan) {
return $.ajax({
url: '/ajax/planCheck.php',
type: "POST",
dataType: 'json',
data: {plan: plan}
});
}
The alert tells me this [object XMLHttpRequest]
any suggestions?

$.ajax() returns results asynchronously. Use .then() chained to $.ajax() call to perform task based on response
$.ajax({
url: '/ajax/planCheck.php',
type: "POST",
dataType: 'json',
data: {plan: $(this).data("plan")}
})
.then(function(success) {
if (success) {
$("#PaymentForm").submit();
}
// if `form` is submitted why do we need to set `.location`?
// window.location = '/membership-change-success';
} else {
alert('Please make sure you deactivate your listings to the appropriate amount before you Downgrade.')
}
}, function err(jqxhr, textStatus, errorThrown) {
console.log(errorThrow)
})

You should use the following form for your ajax call
$.ajax({
url: '/ajax/planCheck.php',
type: "POST",
dataType: 'json',
data: ({plan: $(this).data("plan")}),
success: success = data
})
.done(function(response) {
if(success) {
if (isGood) {
$("#PaymentForm").submit();
}
window.location = '/membership-change-success';
}
else {
alert('Please make sure you deactivate your listings to the
appropriate amount before you Downgrade.')
}
});
the .done() clause ensures that you perform that code after the ajax call is finished and the response is obtained.

How to delay ajax call on keypress?

I have an input box where I'm doing an AJAX GET to check if the email is within my database. I'm simply checking for an email address and if it's within the database, we retrieve true/else false. So depending on the return I display either a tick or cross image.
$.ajax({
url: '/api/user/emailaddress/' + emailAddress,
type: 'GET',
dataType: 'json',
success: function(data) {
if (data===true) {
$(".email-address-validator").removeClass("success");
$(".email-address-validator").addClass("error");
}
}
});
Each time a key is pressed within the input box field, this gets called. The problem that I thought might prop up is if someone looks at this file and see's that I'm doing an AJAX GET request on the field that they might just keep pressing keys on that particular input box.
Q: How can I set a timeout on this, for around 5 seconds so a user doesn't just keep spamming the box?

You could set a flag to handle this scenario. Something like this is much better than a timer.
var waitingForResponse= false;
function isValidEmail () {
if (!waitingForResponse) {
waitingForResponse = true;
$.ajax({
url: '/api/user/emailaddress/' + emailAddress,
type: 'GET',
dataType: 'json',
success: function(data) {
waitingForResponse= false;
if (data===true) {
$(".email-address-validator").removeClass("success");
$(".email-address-validator").addClass("error");
}
}
});
}
}
This design pattern will prevent subsequent requests until the first response is received. If you need a further interval between requests than this suggestion, then you can wrap the waitingForResponse flag in a setTimeout function inside the success callback. Like so:
var waitingForResponse= false;
function isValidEmail () {
if (!waitingForResponse) {
waitingForResponse = true;
$.ajax({
url: '/api/user/emailaddress/' + emailAddress,
type: 'GET',
dataType: 'json',
success: function(data) {
setTimeout(function () {
waitingForResponse= false;
}, 5000);
if (data===true) {
$(".email-address-validator").removeClass("success");
$(".email-address-validator").addClass("error");
}
}
});
}
}

How to display a progress bar during an ajax request (jquery/php)

I have an ajax request, whereby I am installing a magento shop automatically, and when the process is done, it would redirect the user to the newly created shop. Here are my codes:
function postSuccessFormData() {
var targetUrl = '/index.php/install/wizard/successPost';
jQuery('.form-button').addClass('loading');
setInterval(installStatus(),4000);
jQuery.ajax({
url: targetUrl,
global: false,
type: 'POST',
data: ({
finish: 1,
password_key: jQuery('#password_key').val()
}),
async: true,
dataType: 'json',
error: function() {
alert("An error has occurred. Please try again.");
},
success: function(data) {
window.location.href = '/';
}
});
function installStatus() {
var installerUpdatesUrl = '/index.php/install/wizard/installerStatus';
//showProgressBar();
jQuery.ajax({
url: installerUpdatesUrl,
// global: false,
type: 'GET',
async: true,
dataType: 'json',
error: function (data) {
// alert(data.result);
},
success: function (data) {
handle data.result
var dataKeys = Object.keys(data);
var lastElementKey = dataKeys[dataKeys.length - 1];
var lastMessage = data[lastElementKey]['message'];
if(data[lastElementKey]['progress'] == '') {
updateProgressBar(data[dataKeys[dataKeys.length - 2]]['progress'],100);
}
setting message
jQuery("#message").html(lastMessage);
if (data[lastElementKey]['state'] == 'Failure') {
var stepStr = lastElementKey.split('_');
var stepString = stepStr[0].toUpperCase() + ' ' + stepStr[1] + ':';
alert(stepString + "\n" + data[lastElementKey]['message']);
//hideProgressBar();
jQuery('.form-button').removeClass('loading');
return false;
} else if (data[lastElementKey]['state'] == 'Finish') {
alert(data[lastElementKey]['message']);
//hideProgressBar();
jQuery('.form-button').removeClass('loading');
//window.location.href = '/';
} else {
// installStatus();
}
},
complete: function () {
installStatus();
jQuery('.form-button').removeClass('loading');
}
});
}
The way this is done:
After every 4 seconds the function installStatus is run, which will output the current progress in JSON format. My problem is, this function needs to be executed simultaneously with the function post().
This is not happening, the installStatus is only run after the first function has been completed.
What is wrong?

You are executing installStatus when you define it. So this:
setInterval(installStatus(),4000);
needs to be
setInterval(installStatus, 4000);

The new XMLHttpRequest has a nice progress event you can listen to show the user the upload progress.
Here's the spec with a nice demo: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress

Initially you should call installStatus() only once and then inside the method inside ajax success you should update the procent in the progress bar and call it recursively the same method. On the server side you can save the current procent in a cookie and with every recursive call you can update the cookie and return the procent.

Javascript function being called again while it is still running

I have a javascript function that is called when the user clicks on a button and performs an AJAX query that adds some data to my database. However, I've been getting complaints that a lot of data hasn't been getting through, and I've isolated the problem to be the time between clicks. When they wait long enough between clicks, the data always gets through, but if they don't wait long enough it's a crapshoot.
So I'm pretty much settled that the problem is that the javascript function is being called again while it is already running, which I shouldn't allow. Is there a way I can lock the user's browser at the beginning of the function and unlock it at the end after the AJAX? I know this may irritate my users, but I can't see any other solution.
It's not totally necessary, but here's what my javascript function looks like:
function addtolist(thisform, sdata)
{
var scntDiv = $('#p_data');
var request = $.ajax({ async: false, url: "php_addtolist.php", type: "POST", data: {data:sdata}, dataType: "html" });
request.done(function(msg) { outdata = parseInt(msg); });
$(outdata).appendTo(scntDiv);
}

You can disable the button when the function is called, then re-enable it with the complete callback:
function addtolist(thisform, sdata)
{
$('#submit_btn').prop('disabled', true);
var scntDiv = $('#p_data');
var request = $.ajax({
async: false,
url: "php_addtolist.php",
type: "POST",
data: {data:sdata}, dataType: "html" },
complete: function() { $('#submit_btn').prop('disabled', false); }
);
request.done(function(msg) { outdata = parseInt(msg); });
$(outdata).appendTo(scntDiv);
}

Basically it seems like the outdata is async. the following should resolve.
function addtolist(thisform, sdata)
{
var scntDiv = $('#p_data');
var request = $.ajax({ async: false, url: "php_addtolist.php", type: "POST", data: {data:sdata}, dataType: "html" });
request.done(function(msg) {
outdata = parseInt(msg);
$(outdata).appendTo(scntDiv);
});
}