Develop Reference

Show a div during function call jquery

I'd like to display the #LoadingDiv while checkCoupon is firing, and have it disappear when it finishes, to show the function is in progress. checkCoupon is triggered by a button click (not displayed).
I've tried a variety of things including creating another function to include in onclick event, I've put this in different parts of the ajax call, and tried altering the CSS in different ways. It's still not working.
Any idea how to get this functionality and have this display properly at the beginning of the call starts?
function checkCoupon() {
var coupon = document.getElementById('couponCode').value;
var coupon_v = false;
$('#LoadingDiv').css('display', 'block');
$.ajax({
type: 'post',
url: 'coupon.php',
async: false,
data: {
'coupon': coupon
},
success: function(data) {
if (data != "empty") {
coupon_v = data;
}
}
})
}
<div id="LoadingDiv" style="display:none;">One Moment Please...<br />
<img src="images/progressbar.gif" class="displayed" alt="" />
</div>

You can hide the div on ajax complete function which is called when the request finishes (after the success or error callbacks are executed):
complete: function(){
$('#LoadingDiv').hide();
}

You can make use of jQuery's beforeSend and complete methods to address states before and after the call:
function checkCoupon() {
var coupon = document.querySelector('#couponCode').value;
var coupon_v = false;
let $loading = $('#LoadingDiv');
$.ajax({
type: 'post',
url: '.', //coupon.php
async: false,
data: {
'coupon': coupon
},
beforeSend: function() {
$loading.removeClass('hide')
},
success: function(data) {
if (data != "empty") {
coupon_v = data;
}
},
complete: function() {
// timeout only used for demo effect
window.setTimeout(function() {
$loading.addClass('hide')
}, 1500)
}
})
}
.hide {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="LoadingDiv" class="hide">One Moment Please...<br />
<img src="images/progressbar.gif" class="displayed" alt="" />
</div>
<input type="hidden" id="couponCode" value="3" />
<button onclick="checkCoupon()">Click</button>

I had the same issue. I know this is an older question by now, but obviously still relevant as I ran into the same conundrum.
I would call the showLoadingOverlay() method which would make the loading div visible, then run the function I wanted to run and then hide the loading overlay, but the overlay would never show. I finally found that the issue was that the function I was performing after showing the loading overlay was happening too quickly and it would pause the process of showing the overlay until it was done and then the hide function on the overlay was being called too quickly afterwards when the show method was able to resume. This is why it appeared that nothing was happening at all.
So, you need to delay the function you are trying to call (I used the setTimeout() method). The 400 in the setTimeout() method is 400 miliseconds that will be delayed before performing the processFunction method. Here is a generic way to accomplish your goal:
Javascript:
/******************************************************************************************
* Toggle loading overlay.
* ***************************************************************************************/
/**
* Toggle the loading overlay in order to prevent the user from performing any actions.
* The processFunction must call the endLoadOverlay method once it is finished.
* #param {any} processFunction The process to perform while the loading screen is active.
* This method must call the endLoadOverlay method once it is done.
*/
function startLoadOverlay(processFunction) {
$('#overlay').css('display', '');
setTimeout(processFunction, 400);
}
/**
* Ends the loading overlay.
* */
function endLoadOverlay() {
$('#overlay').css('display', 'none');
}
/******************************************************************************************
* End of toggle loading overlay.
* ***************************************************************************************/
Then when you call the startLoadOverlay() method pass the method that you want to accomplish through it. In my example I'm having a button click event call the overlay method:
HTML:
<button id="btnDoAction" type="button" onclick="startLoadOverlay(myFunctionToAccomplish);">Accomplish Something</button>
Remember, myFunctionToAccomplish() is the method that I want performed while the overlay is visible. NOTE: The method that you pass to the startLoadOverlay() method must call the endLoadOverlay() method after it is done processing in order to hide the loading overlay. So:
Javascript
function myFunctionToAccomplish() {
// Perform functionality.
//TODO: Add whatever functionality here.
// Once I'm done I need to call the endLoadOverlay() method in order to hide the loading overlay.
endLoadOverlay();
}
In case you are curious about my $('#overlay') element. The idea is basically from here: https://www.w3schools.com/howto/howto_css_overlay.asp

Limit ajaxStart function to only 1 of 2 ajax functions

I have a loading.gif that launches each time the user makes an AJAX powered search. However, I've got some search fields that automatically show suggestions while the user types, also powered by AJAX.
Now my loading.gif appears on the user search as well as the search suggestions while typing. How do I limit my function that shows the loading.gif to only show when it's a user AJAX search and not a search-suggestion-while-typing AJAX search?
This is my function:
$(document).ajaxStart(function () {
$(".se-pre-con").fadeIn("fast");
}).ajaxStop(function () {
$(".se-pre-con").fadeOut("fast");
});

how about bind it with condition like if user is still on the search input then dont show the loading.gif else if the user is out of the search input or first contact on the search input then show the loading.gif (refer below)
first the global variable
var input_focus = false;
and then when the specified input is on focus
$("#specified_input").focus(function(){
//set the variable named 'input_focus' to true to reject the showing of the loader (loading.gif) or hide it.
input_focus = true;
}).blur(function(){
//when the specified input lose it focus then set the variable 'input_focus' to false so that the loader (loading.gif) is allowed to show
input_focus = false;
});
$.ajax({
url : 'my-url',
type : 'post',
data : {},
beforeSend : function(){
//check if input is on focus
if(input_focus !== true){
//show the loading.gif, assume that #loader
$("#loader").show();
}else{
//hide the loading.gif, assume that #loader
$("#loader").hide();
}
},
complete : function(){
//when the ajax request is complete
},
success : function(response){
//the response function
}
});

I'd tackle it by either of the following:
1) Add a global variable such as showLoadingAnimation and set it to true or false depending on the need. Within your ajaxStart and ajaxStop do the following:
$(document).ajaxStart(function () {
if (showLoadingAnimation) $(".se-pre-con").fadeIn("fast");
}).ajaxStop(function () {
if (showLoadingAnimation) $(".se-pre-con").fadeOut("fast");
});
2) Instead of changing the jQuery global settings, Wrap the jQuery method with your own method:
//only listen to ajaxStop event so that we can hide the animation
$(document).ajaxStop(function () {
$(".se-pre-con").fadeOut("fast");
});
function myAjax(params, showAnimation) {
if (showAnimation) $(".se-pre-con").fadeIn("fast");
$.ajax(params);
}
//in your code you instead of calling $.ajax({...}) simply use `myAjax({...})`
Hope this helps.

Loading Spinner Image too fast at start of Function

I have a function that displays contents of a posts when clicked on. I want the loading spinner to display and delay for few sections before the post content appears. The issue here is when I click on each post, the spinner appears for maybe 1ms and in some cases it disappears long before the content appears.
function showPost(id) {
setTimeout(function() {$('#loader').show();},1);
$('#pcontent').empty();
$.getJSON('http://howtodeployit.com/category/daily-devotion/?json=get_post&post_id=' + id + '&callback=?', function(data) {
var $postcon = $('<div/>').append([$("<h3>", {html: data.post.title}),$("<p>", {html: data.post.content})]);
$postcon.appendTo('#pcontent');
});
}
Spinner HTML:
<div id='loader'><img src="css/images/loader.gif"/></div>

Try this:
function showPost(id) {
$('#loader').show();
$('#pcontent').empty();
$.ajax({
url: 'http://howtodeployit.com/category/daily-devotion/?json=get_post&post_id=' + id + '&callback=?',
dataType: 'json',
success: function (data) {
var $postcon = $('<div/>').append([$("<h3>", {
html: data.post.title
}), $("<p>", {
html: data.post.content
})]);
$postcon.appendTo('#pcontent');
$('#loader').hide();
}
});
}

gif image always behave differently on every device..basically it depends upon device's processing speed. so better option is to use image sprites and animate it with javascript..
In your case at page load there is nothing processing..but as page starts to load device's processor cant handle the load and as a result your gif image gets slower

It seems from your last commented line that you are using a timeout to hide the loader. Instead You should handle the hiding inside the callback function of your ajax request, so that loader hides after request is completed, not after a fixed amount of time:
function showPost(id) {
$('#loader').show();
$('#pcontent').empty();
$.getJSON('http://howtodeployit.com/category/daily-devotion/?json=get_post&post_id=' + id + '&callback=?', function(data) {
$('#loader').hide();
var $postcon = $('<div/>').append([$("<h3>", {html: data.post.title}),$("<p>", {html: data.post.content})]);
$postcon.appendTo('#pcontent');
});
}

How To Call Function on page Loading

I'm Using Web service using AJAX Call In My HTML Page . Web Service Returning Data Nearly 30 to 40 second's .
During This Loading Time I Need to Use Some Loading Gif Images After Data Completely Received Form Web Service The Loading Image Must Be Hide.
I'm Using Only HTML,JAVASCRIPT,CSS,J Query.
Any Idea Or Samples Needed.
I'm Using Following Code
$(document).ready(function () {
document.write('<img src="http://www.esta.org.uk/spinner.gif">');
});
$( window ).load(function() {
//This following Function Related To My Design
jQuery(".chosen").data("placeholder", "Select Frameworks...").chosen();
var config = {
'.chosen-select': {},
'.chosen-select-deselect': { allow_single_deselect: true },
'.chosen-select-no-single': { disable_search_threshold: 10 },
'.chosen-select-no-results': { no_results_text: 'Oops, nothing found!' },
'.chosen-select-width': { width: "95%" }
}
for (var selector in config) {
$(selector).chosen(config[selector]);
}
});
In The Above Code My Problem Is On Page Load Gif Image Show But It's Not Hide Only Gif Image Only Showing.

Put a hidden image on your page and as soon as your ajax call is made, make that image visible
$('#image').show();
$.ajax({
complete: function(){
$('#image').hide();
}
});
and hide that image again on Complete of Ajax call.

Use your ajax request callback (on success/failure) instead of page load.

When sending the request just show a gif animation by setting the Display to block
then when you have the data set the display to none
or use jquery
function showHourGlass()
{
$("#gifimage").show();
}
function hideHourGlass()
{
$("#gifimage").hide();
}

You ask for ideas, I have one sample -
http://www.myntra.com/shoes
load scroll down fastly this is the ajax jquery request which is exact output which you have mentioned in your question
Check source code
Jquery Ajax loading image while getting the data
This what the html looks like:
<button id="save">Load User</button>
<div id="loading"></div>
and the javascript:
$('#save').click(function () {
// add loading image to div
$('#loading').html('<img src="http://preloaders.net/preloaders/287/Filling%20broken%20ring.gif"> loading...');
// run ajax request
$.ajax({
type: "GET",
dataType: "json",
url: "https://api.github.com/users/jveldboom",
success: function (d) {
// replace div's content with returned data
// $('#loading').html('<img src="'+d.avatar_url+'"><br>'+d.login);
// setTimeout added to show loading
setTimeout(function () {
$('#loading').html('<img src="' + d.avatar_url + '"><br>' + d.login);
}, 2000);
}
});
});
I hope this will help you.

Image loading before loading a page with get()

How to display a gif image during the loading ?
i use get.
function getCurrentUrl() {
$(
$.get(
"page1.html",
function (data) {
$("#divReceptLoad").empty().append(data);
},
'html'
)
);
}
than you very much if you can help me :)

Create a <img id="loading" src="..." style="display:none;" /> then:
function getCurrentUrl() {
$('#loading').show(); //show it before sending the ajax request
$.get("page1.html", function (data) {
$('#loading').hide(); //hide in the callback
$("#divReceptLoad").empty().append(data);
},'html'));
}
Feel free to add more styling/positioning to the image and replace the basic show/hide methods with fadeIn/fadeOut, slideDown/slideUp or other effects if you fancy.
Here's a loading GIF generator and another in case you don't want to grab one from Google Images.
And here's a nice collection of premade ones.

function getCurrentUrl() {
$('#gif').fadeIn() // show the hidden gif
$.get("page1.html", function(data){
$('#gif').hide() // hide it
$("#divReceptLoad").empty().append(data);
},'html')
}