I have a JavaScript function which makes an AJAX call to return some data, the call is triggered on a select list change event.
I have tried many ways to display my loader whilst it's waiting, as it currently pauses the select list and doesn't look very good from a customer point of view.
The problem is, no matter what way I've tried to get this to show, the AJAX call completes before the loader shows.
Current Code:
<select name="addresslist" class="form-select" id="edit-addresslist" onchange="selectAddress(this)">
<option value="none">-- Please select an address from the list below --</option>
//there are more options but this isn't important here
</select>
JS File
function selectAddress(data) {
var loader = document.getElementbyId('overlay-loader');
var selectedAddress = data.value;
var uprn = selectedAddress.split(',')[1];
loader.style.display = "block";
$.ajax({
url: '~/collectiondates',
async: false,
data: {
uprn: uprn
},
success: function (data) {
result = data;
}
This is one of the ways I have tried, I have also tried calling a separate function on the "onchange" event, a separate function within selectAddress and another function which shows the loader then calls "selectAddress" but nothing works, the AJAX function is always completed first and then shows the loader (when it's no longer needed).
The rest of the code does exactly as expected.
Thanks.
Hi you should use deferred promises including done,fail and always with your ajax call and even a settimeout if the request is that fast check the example I made in this jsfiddle, also here is a syntax example:
$( function() {
function AjaxCall(rID,rStatus,rComment){
return $.ajax({
url: 'request.php',
data: {
id: rID,
requisitionStatus: rStatus,
comment: rComment
},
type: "POST",
cache: false,
beforeSend: function() {
$("#requisitionStatusDialog").dialog('close');
$('#ajax_loader_my').show();
}
})
}
$( "#requisitionStatusDialog" ).dialog();
$("#yourbuttonInputId").on('click',function(event) {
AjaxCall().done(function(data,response){
var obj = JSON.parse(data);
if (obj.status == "success") {
alert('whe are on done!');
}
}).fail(function(data,response){
$("#updateDialog").dialog(' close');
}).always(function(data){
if(confirm('You have finished the request. Click OK if you wish to continue ,click Cancel to reload the page.'))
{
$('#ajax_loader_my').hide();
$("#requisitionStatusDialog").dialog('open');
}else{
location.reload();
}
});
});
} );
Hope it helps =)
You could try placing the AJAX code inside a setTimeout function, in case the backend is working too fast.
setTimeout(function(){
// put here your AJAX
}, 2000); // 2 seconds delay
It is probably showing later because you are not setting the css to hide after success/error is returned. If you are worried about the loader not showing before the ajax finishes, you can set a delay in the AJAX call using setTimeout function
Here is what I do.
HTML -
<select name="addresslist" class="form-select" id="edit-addresslist" onchange="selectAddress(this)">
<option value="none">-- Please select an address from the list below --</option>
//there are more options but this isn't important here
</select>
JS/JQ -
function selectAddress(data) {
openloader();
var selectedAddress = data.value;
var uprn = selectedAddress.split(',')[1];
$.ajax({
url: '~/collectiondates',
async: false,
data: {
uprn: uprn
},
success: function (data) {
closeloader();
result = data;
}
}
}
function openloader(){
$("#overlay-loader").show();
}
function closeloader(){
$("#overlay-loader").hide();
}
Related
I have a project which involves live notification. So I stumbled upon using socket io but I didn't have enough time to learn it yet. So I tried doing it with AJAX and jQuery. Below is my code structure and I was wondering if this is gonna work with no drawbacks?
setInterval(function(){
if( !element.hasClass('processing') ){
element.addClass('processing');
$.ajax({
type: 'post',
dataType: 'json',
url: ajaxurl,
data: {},
success: function( response ){
/* Success! */
element.removeClass('processing');
}
});
}
}, 2500);
Some Extra Info
The way you described will work. From Experience I would just like to point out some things.
I usually do a recursive function, allows you to wait your interval between ajax calls and not a fixed rate. //OPTIONAL BUT DOES GIVE THE SERVER SOME BREATHING ROOM.
Use window.setTimeout() with an isActive flag. //ALLOWS YOU TO STOP POLLING FOR WHATEVER REASON, AND BECAUSE FUNCTION IS RECURSIVE START UP AGAIN IF NEED BE
For Sake of being thorough, I found it is always a good idea to handle the error case of the $.ajax() post. You could perhaps display some message telling the user he is no longer connected to the internet etc.
Some Sample Code:
var isActive = true;
$().ready(function () {
//EITHER USE A GLOBAL VAR OR PLACE VAR IN HIDDEN FIELD
//IF FOR WHATEVER REASON YOU WANT TO STOP POLLING
pollServer();
});
function pollServer()
{
if (isActive)
{
window.setTimeout(function () {
$.ajax({
url: "...",
type: "POST",
success: function (result) {
//SUCCESS LOGIC
pollServer();
},
error: function () {
//ERROR HANDLING
pollServer();
}});
}, 2500);
}
}
NOTE
This is just some things I picked up using the exact method you are using, It seems that Web Sockets could be the better option and I will be diving into that in the near future.
Please refer :
Jquery : Ajax : How can I show loading dialog before start and close after close?
I hope this could help you
$("div.add_post a").click(function(){
var dlg = loadingDialog({modal : true, minHeight : 80, show : true});
dlg.dialog("show");
$.ajax({
url : "/add.php",
complete : function (){
dlg.dialog("hide");
}
});
return false;
});
//--Loading dialog
function loadingDialog(dOpts, text = "пожалуйста подождите, идет загрузка...")
{
var dlg = $("<div><img src='/theme/style/imgs/busy.gif' alt='загрузка'/> "+text+"<div>").dialog(dOpts);
$(".ui-dialog-titlebar").hide();
return dialog;
}
I have a Employee page which shows list of employees with an edit option. On clicking the edit button jquery-ajax is used to fetch the data from the server.
The problem is when I click the edit button the event is firing twice.
I am using a seperate js file and is referring the file to the main page.The script was working fine until i moved it to the seperate js file.
The Jquery script is
//ajaxGet on edit button click
$(document).on('click', '.editRole', ajaxGet);
var ajaxGet = function (e) {
var spinner = $(this).parent('div').find('.spinner');
var href = $("#editMenuSettings").data("url");
var menuRoleId = $(this).data('id');
spinner.toggle(true);
var options = {
type: "GET",
url: href,
data: { menuRoleId: menuRoleId }
};
$.ajax(options).success(function (data) {
spinner.toggle(false);
$(".modal-body").html(data);
$(".modal").modal({
backdrop: 'static'
});
});
$.ajax(options).error(function (data) {
spinner.toggle(false);
toastr.error("Oops..Some thing gone wrong");
});
return false;
};
You call $.ajax twice.
At lines
$.ajax(options).success(function(data)...
$.ajax(options).error(function(data)...
you actually make two different AJAX calls - one with success callback only, another one with error callback.
In your case, your call should look like this:
var options = {
type: "GET",
url: href,
data: { menuRoleId: menuRoleId }
};
$.ajax(options)
.success(function (data) {
spinner.toggle(false);
$(".modal-body").html(data);
$(".modal").modal({
backdrop: 'static'
});
})
.error(function (data) {
spinner.toggle(false);
toastr.error("Oops..Some thing gone wrong");
});
return false;
It will set both callbacks to the single AJAX call and execute this one.
Hello guys here's my code:
var ajax={
chiamata:function(target,url,opzioni){
if (!tools.array_key_exists('caricamento',opzioni)){
opzioni['caricamento']=1;
}
var dati=url.split('?');
$.ajax({
type: opzioni['type'],
url: url,
contentType:"application/x-www-form-urlencoded; charset=UTF-8",
data: dati[1],
dataType: "html",
success: function(msg){
if (opzioni['caricamento']!=0){
ajax.printLoading();
}
$(target).html(msg);
},
error: function(){
alert("Chiamata fallita!");
}
})
},
printLoading:function(){
var body="#colonnaDX";
$(body).ajaxStart(function(){
$(body).append('<div id="loading"><img src="graphic/IMAGE/spinner.gif"/>Loading...</div>');
})
.ajaxStop(function(){
$('#loading').remove();
});
}
},
//Recursive function
var object={
checkAzione:function(target,url,opzioni,interval){
if (!interval)
interval=60000;
ajax.chiamata(target,url,opzioni);
setTimeout(function() {
this.checkAzione(target,url,opzioni,interval);
}, interval);
}
}
$(document).ready(function(){
object.checkAzione(
'#colonnaDX',
'someactions.php',{
'caricamento':0
},
10000
);
})
I'll try to explain the problem as better as i can, When the document is ready, the function "checkAzione" starts and it makes some stuff like DB calls etc, this kinds of ajax calls don't need any visual loading like spinner etc so in the array "opzioni" i set a flag 'caricamento':0 (same of 'loading':0) just check my ajax object to see what i mean, it works until i make some ajax calls that using 'caricamento':1, from that moment every ajax calls in my recursive function makes the "printLoading"... Any tips????
ajaxStart and ajaxStop are global, you add them to the body. You probably shouldn't use ajaxStart/Stop in this case, just add the functionality to your ajax listeners (success and error).
I have a nifty little piece of Ajax code that loads in PHP.
http://www.moneyworrier.com/client-stories/
What happens is that when you click on a menu item on the left-hand navigation, it reloads a Div with content appropriate.
What it does however is loop through previous requests, which is bothersome (Click on any left hand item 3x and you will see what I mean). I think I need to find a function that does the equivalent of exit; and clears any post data.
My call in code is:
Video
And my JS looks like:
$(document).ready(function () {
$('a.media').click(function () {
var usr = $(this).attr('rel');
$("#displaystories").html('Retrieving..');
$.ajax({
type: "POST",
url: "/client-stories/media.php",
data: "showcode=" + usr,
success: function (msg) {
$("#displaystories").ajaxComplete(function (event, request, settings) {
$(this).html(msg);
});
}
});
});
});
You're binding a new listener to ajaxComplete on every click. Your success callback should just be:
success: function(msg) {
$("#displaystories").html(msg);
}
I'm using bsmSelect jQuery plugin. Basically, what it does is changing the way a select-multiple is rendered to make easier to pick up the options. It hides the select element and shows a list instead.
So, first of all I'm applying the plugin function to my select-multiple element:
$(document).ready(function() {
...
$('#my_select_multiple').bsmSelect({
plugins: [$.bsmSelect.plugins.sortable()],
title: 'Add',
removeLabel: 'Remove'
});
...
});
On the other way, I have another select element (this one is simple) which has an ajax request bind to its change event. This ajax request get new #my_select_multiple options depending on the select simple value. Ajax response is the new HTML for #my_select_multiple options. So I have:
function getNewOptions(val) {
var r = $.ajax({
type: 'GET',
url: /*My URL*/
}).responseText;
return r;
}
...
$(document).ready(function() {
...
$('#my_select_simple').change() {
$('#my_select_multiple').html(getNewOptions($(this).val()));
}
...
});
AJAX is working as expected. New options are got correctly and they are inserted into #my_select_multiple (which is hidden by bsmSelect plugin, but I can check it with Firebug). But bsmSelect didn't realize new changes and doesn't get updated.
So, I think what I want is to reapply $('#my_select_multiple').bsmSelect(); with its new options.
I've been looking around a little bit and here is what I have tried.
1. I've tried to call again the funcion with the success and complete (one at time) of the AJAX request. Didn't work:
function getNewOptions(val) {
var r = $.ajax({
type: 'GET',
url: /*My URL*/,
success: function() { $('#my_select_multiple').bsmSelect(); }
}).responseText;
return r;
}
2. I've tried to bind the function with the on jQuery function. Didn't work:
$('#my_select_simple').on('change', function() {
$('#my_select_multiple').bsmSelect();
});
3. I've tried 1 and 2 removing previosly the HTML generated by bsmSelect. Didn't work.
Thank you very much.
UPDATE: The exact code
First I have a global.js file which apply bsmSelect plugin to some select multiples (.quizzes):
$('.quizzes').bsmSelect({
plugins: [$.bsmSelect.plugins.sortable()],
title: 'Add',
removeLabel: 'Remove'
});
And then, in the php file I define the updateQuizzes function and bind it to the select simple (project_id) change event:
<script type="text/javascript">
function updateQuizzes(project_id) {
var r = $.ajax({
type: 'GET',
url: '<?php echo url_for('event/updateQuizzes')?>'+'<?php echo ($form->getObject()->isNew()?'':'?id='.$form->getObject()->getId()).($form->getObject()->isNew()?'?project_id=':'&project_id=')?>'+project_id,
success: function() { $('.quizzes').bsmSelect({
plugins: [$.bsmSelect.plugins.sortable()],
title: 'Add',
removeLabel: 'Remove'
}); }
}).responseText;
return r;
}
$('#project_id').change(function(){
$('.quizzes').html(updateQuizzes($(this).val()));
});
</script>
As I told, the AJAX request works without problems, but not the calling bsmSelect the second time...
Not sure if this is what the problem is, but you could try
$('#my_select_simple').change() {
$('#my_select_multiple').html(getNewOptions($(this).val())).trigger('change');
}
This triggers a change event on select_multiple, and might fire bsmSelect. I'm not sure what the problem here is exactly, but that's the best I can come up with.
I think you want to set your HTML in the success of the Ajax call, something like:
function loadNewOptions(val) {
$.ajax({
type: 'GET',
url: /*My URL*/,
success: function(data) {
$('#my_select_multiple').html(data).bsmSelect();
}
});
}
And then calling like:
$('#my_select_simple').change() {
loadNewOptions($(this).val());
}
$(document).ready(function() {
$('#my_select_simple').change() {
$('#my_select_multiple').load("your Url", function(){
$('#my_select_multiple').bsmSelect();
});
}
});
something like this should work.
.load will put whatever your url returns into #my_select_multiple
the first parameter is the url to load, and the 2nd is a function to call when it is done. which is where you need to set up your fancy selector.
Ok, I opened a ticket and bsmSelect developer has answered me in minutes. Great!
To let bsmSelect know about its select changes, you have to trigger a change event on the select. There is no need to call bsmSelect again.
So it can be that way:
function loadNewOptions(val) {
var r = $.ajax({
type: 'GET',
url: /*My URL*/,
success: function(data) {
$('#my_select_multiple').html(data).trigger('change');
}
}).responseText;
return r;
}
$('#my_select_simple').change(function() {
loadNewOptions($(this).val());
});