Develop Reference

How to define a variable after process in ajax?

I use an ajax process to modify user's state on an index.php file.
It works but I would like to color my div function of the user's state
My code:
function recupstatut() {
$.post('recup.php', function(data) {
$('.cont2').html(data);
var content = document.querySelector('#cont2');
var status2 = content.innerHTML;
if (status2 == "En-ligne") {
content.style.backgroundColor = "#4CAF50";
} else {
content.style.backgroundColor = "#f44336";
}
});
}
setInterval(recupstatut, 1000);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div class="cont2" id="cont2">
</div>
The condition always applies the else state:
content.style.backgroundColor = "#f44336";
I think the problem comes from var status2 =
How can I fix this?

HTML
<div class="cont2" id="cont2"></div>
SCRIPT
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script>
function recupstatut() {
$.post('recup.php', function(data) {
console.log(data);
var status2 = data.trim();
console.log(status2);
$('.cont2').html(status2);
if (status2 == "En-ligne") {
content.style.backgroundColor = "#4CAF50";
} else {
content.style.backgroundColor = "#f44336";
}
});
}
setInterval(recupstatut, 1000);
</script>
what went wrong is that you imported jquery file after calling the function
so make the import in top of calling your function
your mistake was that you made the import after calling the function, that is why you got undefined error.

As you say you echo string in your page then you can check this one directly from the data as per below code.
Script:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script>
$(function(){
function recupstatut() {
$.post('recup.php', function(data) {
$('#cont2').html(data); // If the data return from the php page as a string then you can compare it directly.
if (data == "En-ligne") {
$('#cont2').css("backgroundColor","#4CAF50");
} else {
$('#cont2').css("backgroundColor","#f44336");
}
});
}
setInterval(recupstatut, 1000);
});
</script>
HTML:
<div class="cont2" id="cont2"></div>

function recupstatut(){
$.post('recup.php',function(data){
console.log(data);
$('.cont2').html(data);
var status2 = data;
if (status2 == "En-ligne") {
$('#cont2').css("backgroundColor","#4CAF50");
} else {
$('#cont2').css("backgroundColor","#f44336");
}
});
}
setInterval(recupstatut,1000);
nothing appear in my div now with the console.log...

THere many ways to accomplish this. You can use the $.post() function by sending the $.post as a variable. Example:
// Fire off the request to /form.php
request = $.post({
url: "recup.php",
});
// Callback handler that will be called on success
request.done(function (response, textStatus, jqXHR){
// Log a message to the console
console.log("Hooray, it worked!");
});
// Callback handler that will be called on failure
request.fail(function (jqXHR, textStatus, errorThrown){
// Log the error to the console
console.error(
"The following error occurred: "+
textStatus, errorThrown
);
});
// Callback handler that will be called regardless
// if the request failed or succeeded
request.always(function () {
// Reenable the inputs
$inputs.prop("disabled", false);
});
Or (i recommended) use the $.ajax({}) function as this way:
// Fire off the request to /form.php
$.ajax({
url: "recup.php",
type: "post",
data: { //specify data to be sent },
beforeSend:function(){
/* before sending the data to the other page
may be a loader to show waiting animation
*/
},
success:function(status){
/* this will check the response received from the previous page
and the determine the below conditions
*/
if (status == "En-ligne") {
content.style.backgroundColor = "#4CAF50";
} else {
content.style.backgroundColor = "#f44336";
}
}
});

jQuery AJAX function call

I have a problem with jQuery calling an AJAX function, basically everytime a user changes a select box, I want it to call the getSubCategories function, but for some reason, nothing is happening. Any ideas?
If I load the page and add console.log inside the getSubCategories function it logs it, should that even be happening?
function getSubCategories() {
var id = $("#category").prop('selectedIndex');
var selectedCategory = $("#category").val();
//should change this into a response from AJAX and grab the slug from there, this is fine for now.
var slugOfCategory = convertToSlug(selectedCategory);
id++;
console.log('here');
$.ajax({
method: 'GET', // Type of response and matches what we said in the route
url: '/product/get_subcategories', // This is the url we gave in the route
data: {
'id': id
}, // a JSON object to send back
success: function(response) { // What to do if we succeed
$("#sub_category option").remove(); //Remove all the subcategory options
$.each(response, function() {
$("#sub_category").append('<option value="' + this.body + '">' + this.body + '</option>'); //add the sub categories to the options
});
$("#category_slug").attr('value', slugOfCategory);
},
error: function(jqXHR, textStatus, errorThrown) { // What to do if we fail
console.log(JSON.stringify(jqXHR));
console.log("AJAX error: " + textStatus + ' : ' + errorThrown);
}
});
}
function getCategories() {
var id = $("#type").prop('selectedIndex');
var selectedType = $("#type").val();
//should change this into a response from AJAX and grab the slug from there, this is fine for now.
var slugOfType = convertToSlug(selectedType);
console.log(slugOfType);
//add one to the ID because indexes dont start at 0 as the id on the model
id++;
$.ajax({
method: 'GET', // Type of response and matches what we said in the route
url: '/product/get_categories', // This is the url we gave in the route
data: {
'id': id
}, // a JSON object to send back
success: function(response) { // What to do if we succeed
$("#category option").remove(); //Remove all the subcategory options
$.each(response, function() {
$("#category").append('<option value="' + this.name + '">' + this.name + '</option>'); //add the sub categories to the options
});
$("#type_slug").attr('value', slugOfType);
},
error: function(jqXHR, textStatus, errorThrown) { // What to do if we fail
console.log(JSON.stringify(jqXHR));
console.log("AJAX error: " + textStatus + ' : ' + errorThrown);
}
});
}
function convertToSlug(Text) {
return Text
.toLowerCase()
.replace(/ /g, '_')
.replace(/[^\w-]+/g, '');
}
$(document).ready(function() {
var firstCatgegory = $("#category").val();
var slugOfFirstCategory = convertToSlug(firstCatgegory);
$("#category_slug").attr('value', slugOfFirstCategory);
var firstType = $("#type").val();
var slugOfFirstType = convertToSlug(firstType);
$("#type_slug").attr('value', slugOfFirstType);
$("#type").change(getCategories());
$("#category").change(getSubCategories());
});
Thanks for any help. (Sorry the code is a little messy, i've just been trying to get it to work so far)

This is due to the fact that the ajax call you are trying to make is asynchronous. When you call getSubCategories() it returns undefined which is why your code is not working.
To make this work you need to put your code within the success callback function instead.
<script>
function getSubCategories()
{
var id= $("#category").prop('selectedIndex');
$.ajax({
method: 'GET',
url: '/product/get_subcategories',
data: {'id' : id},
success: function(response){
// DO SOMETHING HERE
},
error: function(jqXHR, textStatus, errorThrown) { }
});
}
$( document ).ready(function() {
// This is also wrong. Currently you're passing
// whatever is returned from getSubCategories
// (which is undefined) as the callback function
// that the "change" event will call. This instead
// should be the reference to the function. Which
// in this case is getSubCategories
$("#category").change(getSubCategories);
});

Please put getCategories() and getSubCategories() Methods inside Change function like this.Sorry for not code formatting.
<script>
$(document).ready(function(){
$("#category").change(function(){
getSubCategories();
});
$("#type").change(function(){
getCategories();
});
});
</script>

ajax loading indicator stopped in between

I am saving data on a save button click that calls ajax and passing json data to a controller method but when we save it loading starts and suddenly stop though the data is not saved.
It is not working I have tried it in all way but not working please help me on this.
<button type="button" id="saveDeleg" class="btn_reg_back btnmainsize btnautowidth btngrad btnrds btnbdr btnsavesize " aria-hidden="true" data-icon="">#Resources.Resource.Save</button>
$('#saveDeleg').click(function() {
var response = Validation();
if (!response) {
return false;
}
$("#overlay").show();
$('.loading').show();
if ($('#organName').val() == '') {
$('#validorganisation').show();
return false;
} else {
$('#validorganisation').hide();
}
//Contact name
var SubDelegation = $('#subdelegation').is(':checked');
var CopyNotification = $('#copynotification').is(':checked');
var ArrangementId = $("#ArrangementId").val();
var paramList = {
ArrangementId: ArrangementId,
ArrangementName: $('#arrangName').val(),
OrganisationName: $('#organName').val(),
OrganisationId: $('#OrganisationId').val(),
ContactName: $('#contactName').val(),
ContactId: $('#ContactId').val(),
SubDelegation: $('#subdelegation').is(':checked'),
CopyNotification: $('#copynotification').is(':checked'),
ContactType: $('#ContactType').val(),
SelectedTypeName: $("input[name$=SelectedType]:checked").val()
};
setTimeout(function() {
$.ajax({
async: false,
type: "POST",
url: '#Url.Action("SaveDelegation", "Structures")',
dataType: "json",
contentType: "application/json; charset=utf-8",
data: JSON.stringify(paramList),
processdata: true,
success: function(result) {
//stopAnimation()
paramList = null;
if (result == 0) {
window.location.href = '../Structures/MyDelegationArrangement';
} else if (result == 1) {
window.location.href = '../Structures/CreateDelegation';
} else if (result == 2) {
window.location.href = '../Home/Error';
} else if (result == 3) {
window.location.href = '../Account/Login';
} else {
//validation message
alert('Error');
}
},
error: function() {},
complete: function() {
$("#overlay").hide();
$('.loading').hide();
}
});
}, 500);
});

The problem with the loading indicator is because you used async: false which locks up the UI. Remove that setting.
Also note that if the data is not being saved I would assume that your AJAX call is returning an error. If so, check the console to see the response code. It may also be worth putting some logic in the error callback function to give you some information on whats happened, as well as inform your users about what to do next.

Ajax PHP Follow Script - Nothing stored in the database

I recently discovered a treehouse blog on ajax for beginners http://blog.teamtreehouse.com/beginners-guide-to-ajax-development-with-php I've been looking for a follow script for a while and I've hit a dead end. Currently the follow button fades as it should do, yet no values are stored in the database as of yet.
Profile.php (follow button):
<div id="followbtncontainer" class="btncontainer">Follow</div>
Ajax.js
$(function(){
$('#followbtn').on('click', function(e){
e.preventDefault();
$('#followbtn').fadeOut(300);
$.ajax({
url: '../ajax-follow.php',
type: 'post',
data: {'action': 'follow'},
success: function(data, status) {
if(data == "ok") {
$('#followbtncontainer').html('<p><em>Following!</em></p>');
var numfollowers = parseInt($('#followercnt').html()) + 1;
$('#followercnt').html(numfollowers);
}
},
error: function(xhr, desc, err) {
console.log(xhr);
console.log("Details: " + desc + "\nError:" + err);
}
}); // end ajax call
});
$('body').on('click', '#morefllwrs', function(e){
e.preventDefault();
var container = $('#loadmorefollowers');
$(container).html('<img src="images/loader.gif">');
var newhtml = '';
$.ajax({
url: 'ajax-followers.php',
type: 'post',
data: {'page': $(this).attr('href')},
cache: false,
success: function(json) {
$.each(json, function(i, item) {
if(typeof item == 'object') {
newhtml += '<div class="user"> <img src="'+item.profile_pic+'" class="avi"> <h4>'+item.username+'</h4></div>';
}
else {
return false;
}
}) // end $.each() loop
if(json.nextpage != 'end') {
// if the nextpage is any other value other than end, we add the next page link
$(container).html('Load more followers');
} else {
$(container).html('<p></p>');
}
$('#followers').append(newhtml);
},
error: function(xhr, desc, err) {
console.log(xhr + "\n" + err);
}
}); // end ajax call
});
});
ajax.php
<?php require 'database.php' //<?php include 'session-check-index.php' ?>
<?php include 'authentication.php' ?>
<?php
session_start();
$follower=$_SESSION['id'];
$sql = "SELECT * FROM users WHERE username='$username'";
$result = mysqli_query($database,$sql);
$rws = mysqli_fetch_array($result);
$following=$rws['id'];
/**
* this script will auto-follow the user and update their followers count
* check out your POST data with var_dump($_POST)
**/
if($_POST['action'] == "follow") {
$sql=" INSERT INTO `user_follow` (`follower`, `following`, `subscribed`) VALUES ('$follower', '$following', CURRENT_TIMESTAMP);"
/**
* we can pass any action like block, follow, unfollow, send PM....
* if we get a 'follow' action then we could take the user ID and create a SQL command
* but with no database, we can simply assume the follow action has been completed and return 'ok'
**/
mysqli_query($database,$sql) or die(mysqli_error($database));
}
?>
I'm not sure if the actual $following and $follower values are causing the problem, and just not passing any data. Any help would be much appreciated, thanks!

try to change in ajax.js
$(function(){
$('#followbtn').on('click', function(e){
e.preventDefault();
$('#followbtn').fadeOut(300);
$.ajax({
url: '../ajax-follow.php',
...
the url parameter to :
url: 'ajax-follow.php',
See if it will work that way

Hiding a modal on clicking off in bootstrap

I have a button that turns on and off a connection. When the button is in on state and the user clicks on it. In order to turn it off, a modal pops up and asks for confirmation. But when the button is in off state, no modal should pop up. The problem is that its the same button that is being toggled to display "On" and "Off" and a modal element is attached to it. Even when the off button is clicked the modal pops up which I don't want. Please help me out.
if(status == 'On'){
var url = "/streams/status";
$('button[id="modal-'+ streamId + '"]').click(function(){
console.log("close modal function")
$('myModal-'+ streamId).modal('hide');
$.ajax({
type: "POST",
url: url,
data: "streamId="+streamId,
success: function(res){
$('button[id="profile-'+ res.streamId + '"]').toggleClass('btn-success btn-danger');
$('button[id="profile-'+ res.streamId + '"]').text(function (){
console.log($(this).text())
return 'Off';
});
},
error: function (res){
console.log('there was an error', res);
}
});
})
}
else{
console.log("button is off currently");
$('myModal-' + streamId).modal('hide');
var url = "/streams/status";
$.ajax({
type: "POST",
url: url,
data: "streamId="+streamId,
success: function(res){
$('button[id="profile-'+ res.streamId + '"]').toggleClass('btn-success btn-danger');
$('button[id="profile-'+ res.streamId + '"]').text(function (){
console.log($(this).text())
return 'On';
});
},
error: function (res){
console.log('there was an error', res);
}
});
}
})

i think you should add a rel attribute (off or on), detect onclick event and check this attribute :
$('#myModal-' + streamId).click(function(event){
if($('#myModal-' + streamId).attr('rel') == 'on'){
//do ajax request ON here
//on success ajax, replace return 'off' by
$('#myModal-' + streamId).attr('rel', 'off');
}
else{
//do ajax request OFF here
//on success ajax, replace return 'on' by
$('#myModal-' + streamId).attr('rel', 'on');
}
}
it should be works

Here is the correct way to do it:
script.
function toggleStatus (streamId, statusBefore){
$.ajax({
type: "POST",
url: "/streams/status",
data: "streamId="+streamId,
success: function(res){
$('button[id="profile-'+ res.streamId + '"]')
.toggleClass('btn-success btn-danger')
.attr('data-toggle', statusBefore == true ? "": 'modal');
$('#profile-glyphicon-'+ res.streamId).toggleClass('glyphicon-ok glyphicon-remove');
},
error: function (res){
console.log('there was an error', res);
}
});
}
$('button[id^="modal-"]').click(function(){
var streamId = this.id.split('-')[1];
toggleStatus(streamId, true);
$('myModal-'+streamId).modal('hide');
})
$('button[id^="profile-"]').on("click", function(e){
var streamId = this.id.split('-')[1];
var statusBefore;
var dataToggleStatus = $('#profile-' + streamId).attr("data-toggle");
if(dataToggleStatus=='modal'){
statusBefore = true;
e.preventDefault();
} else {
statusBefore = false;
toggleStatus(streamId, statusBefore);
}
})