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Checking the visibility of a div not working inside ajax success function

Well long story short, I am trying hide a div inside Ajax success function depending on whether its visible or not. But don't understand why it isn't working. I can set it to hide simply and which works but in the console when I check I find that it keeps on setting the div to display:none even if it is already hidden.
JS
$(document).ready(function() {
$('#loading').show();
setInterval(function () {
$.ajax({
type: "GET",
url: "generate_list.php",
success: function (result) {
//$('#loading').hide();
$('#loading:visible').hide();
if(result != '') {
$('#empty_storage').hide();
$('#file_list').html(result);
}
else {
$('#file_list').html('');
$('#empty_storage').show();
}
}
});
}, 1700);
});

Toggle visibility
$(document).ready(function() {
$('#loading').css('visibility': 'visible');
setInterval(function () {
$.ajax({
type: "GET",
url: "generate_list.php",
success: function (result) {
if ($('#loading').css('visibility') == 'visible') {
$('#loading').css('visibility','hidden');
}
if(result != '') {
$('#empty_storage').hide();
$('#file_list').html(result);
}
else {
$('#file_list').html('');
$('#empty_storage').show();
}
}
});
}, 1700);
});
CSS : Initially loader will be hidden
#loading {
visibility : hidden;
}
So go with visibility property if you want to check the visibility. But if you want to use .hide() or .show() then it depends on display property
Visibility : http://www.w3schools.com/cssref/pr_class_visibility.asp
Display : http://www.w3schools.com/cssref/pr_class_display.asp
Sample Demo : https://jsbin.com/jiluren/11/edit?html,css,js,output
Hope this helps. Thanks !

Your problem might be that you misplaced the call of showing the loading indicator. You call $('#loading').show(); only once, before starting the setInterval iteration. So the first time your #loading gets hidden, it will stay hidden forever. You should call $('#loading').show(); before each ajax call like this.
$(document).ready(function() {
setInterval(function () {
$('#loading').show();
$.ajax({
type: "GET",
url: "generate_list.php",
success: function (result) {
//$('#loading').hide();
$('#loading:visible').hide();
if(result != '') {
$('#empty_storage').hide();
$('#file_list').html(result);
}
else {
$('#file_list').html('');
$('#empty_storage').show();
}
}
});
}, 1700);
});
Also, note that for such a loading indication it's better to hide it in the always callback of the promise returned by $.ajax. That way the loading panel will be hidden also when an error occures, and the success callback is not called. I mean something like thi.
$("#loading").show();
$.ajax({ ... })
.always(function() {
$("#loading").hide();
});

If i understand your requirement , you need to show the loading icon before ajax call and hide it once ajax call completes
In that case there are predefined callback functions avialable
beforeSend: function (xhr) {
$("#loaderforsearch").show()
},
complete: function()
{
$("#loaderforsearch").hide();
},

FadeOut Content load and show content

i want to simply show the content after load not fadeIn how is it possible?
$(function() {
$('.hovers').click(function(event) {
var target = $(this).attr('href');
window.location.hash = target;
$.ajax({
url: target,
success: function(data) {
$('#allcontent')
.fadeOut('slow', function() {
$(this).html(data).fadeIn('slow');
});
}
});
return false;
});
});
maybe i use .show() ?
Thanks for help

success: function(data) {
$('#allcontent').html(data).show();
}

Just fadeIn 0 , which happens immediately
$(this).html(data).fadeIn(0);
also you might want to do this
$(this).html(data).delay(2000).fadeIn(0);
adding a delay of 2 seconds or however much you want, and then show immediately

Sliding without hiding element?

Is there a way to animate new DOM elements without having to hide them first? If so, how?
For example, what I'm doing now is:
$(document).ready(function() {
$(document).on("click", ".link", function(event) {
event.preventDefault();
var count = 1;
$.ajax({
url: 'php/get_data.php',
type: 'POST',
dataType: 'json',
data: { total_count: count },
success: function(data) {
$(".new-elements").append(data).hide().slideDown(function() {
}
});
});
});
Thanks.

Yes, you try to add css (for default for these elements) for example display: none or if you prefer opacity: 0 only, then you try to animate them.

jQuery pagination - Applying class to items

I am trying to design a pagination system in jQuery. The bit I am stuck on is when I click on different page number links, I want it to move the "active" class to the newly clicked page.
In the example page "1" has the active class. When I click "2" I want the active class to move to "2" and be removed from "1".
http://jsfiddle.net/qKyNL/24/
$('a').click(function(event){
event.preventDefault();
var number = $(this).attr('href');
$.ajax({
url: "/ajax_json_echo/",
type: "GET",
dataType: "json",
timeout: 5000,
beforeSend: function () {
$('#content').fadeTo(500, 0.5);
},
success: function (data, textStatus) {
// TO DO: Load in new content
$('html, body').animate({
scrollTop: '0px'
}, 300);
// TO DO: Change URL
// TO DO: Set number as active class
},
error: function (x, t, m) {
if (t === "timeout") {
alert("Request timeout");
} else {
alert('Request error');
}
},
complete: function () {
$('#content').fadeTo(500, 1);
}
});
});
I'm quite new to jQuery and could do with some help. Can anyone please give me some guidance on how to do this?

You could check addClass method here and removeClass method here

Remove the current active li and add the active class to the one you clicked.
Add those two lines in your click event handler
$('#pagination li.active').removeClass("active");
$(this).parent().addClass("active");

When this ajax jquery trigger I want a image that loads for 1 second

I have this code
<script type="text/javascript">
$(function () {
$(".a").live("click", function () {
var $this = $(this),
ProductImageId = $this.data('ProductImageId');
$.ajax({
url: '/Home/AddToCart',
type: "post",
cache: false,
data: { ProductImageId: ProductImageId },
success: function (data) {
data = eval(data);
$this.addClass('productSelected');
},
error: function (result) {
$(".validation-summary-errors").append("<li>Error connecting to server.</li>");
}
});
});
Every time someone click on this button I want a image to load for like 1 sec
so the user knows that something happened..
any kind of help is appreciated

Something like:
var $loader = $('<img src="loader.gif">').appendTo(document.body);
And then
success: function (data) {
setTimeout(function() {
$loader.remove();
data = eval(data);
$this.addClass('productSelected');
},1000);
}
It will show the image for 1sec + the ajax loading time. Although, as a visitor of your site I would probably prefer to skip the 1sec delay...

Add before send like this :
beforeSend: function(){
$("some element").append("<img src='url' id='one_sec_img' />");
SetTimeout(1000, function(){
$("#one_sec_img").hide();
})
}
But, I think your requirement is something normal :
Here, bcoz of the before send, as soon as you click button that triggers ajax, the image will be loaded, and on success, the image can be hidden . This is the usual process, in this case,setTimeout is not needed . But, if your requirement is something like, the image should appear only one sec, you can use set timeout. Otherwise, below code is enough.
beforeSend: function(){
$("some element").append("<img src='url' id='one_sec_img' />");
},
success: function(res){
$("#one_sec_img").hide();
}

<script type="text/javascript">
$(function () {
$(".a").live("click", function () {
var html=$(this).html();
$(this).html('loading');//<img src="" />
var $this = $(this),
ProductImageId = $this.data('ProductImageId');
$.ajax({
url: '/Home/AddToCart',
type: "post",
cache: false,
data: { ProductImageId: ProductImageId },
success: function (data) {
$(".a").html(html);
data = eval(data);
$this.addClass('productSelected');
},
error: function (result) {
$(".validation-summary-errors").append("<li>Error connecting to server.</li>");
}
});
});
try this.

Use jQuery BlockUI Plugin to show the image, may be it solve your problem.

Try:
$(".a").click( function( ) {
$("#idOfImage").show().delay( 1000 ).hide();
// ajax call
});
else if you only want the image to disappear only after the ajax call
$(".a").click( function( ) {
$("#idOfImage").show();
$.ajax({
// parameters
}).done( function( ) {
$("#idOfImage").hide( );
});
});