I have added an ajax loader to my code below. The problem is when the data from database is over, still the scroll function is going to an infinite loop and also the ajax scroll image is displayed. I want to stop the scroll function once the data is finished and also disable the ajax loader image. THis is my code
var counter=25;
$(window).on('scroll',function(){
if($(window).scrollTop()==($(document).height()-$(window).height())){
$('div#lastPostsLoader').html('<img src="loading-icon.gif">');
//Get older posts
$.ajax({
type: 'POST',
url: 'getdata.php?start_row=' + counter,
success: function(oldposts){
if(oldposts)
{
//Append #postsDiv
$('#data').append(oldposts);
counter += 15;
}
else
{
$('#lastPostsLoader').hide();
}
}
});
}
});
Try with this:
var counter = 25;
$(window).on('scroll', function () {
if ($(window).scrollTop() == ($(document).height() - $(window).height())) {
$(document).ajaxStart(function() {
$('div#lastPostsLoader').html('<img src="loading-icon.gif">');
});
$.ajax({
type: 'POST',
url: 'getdata.php?start_row=' + counter,
success: function (oldposts) {
if ($('#data')) {
$('#data').append(oldposts);
counter += 15;
}
}
});
$(document).ajaxComplete(function() {
$('div#lastPostsLoader').find('img[src^="loading"]').remove();
});
}
});
If i am not wrong, in the success function, if you get the data, you should hide the loader there itself. I am not getting what is the purpose of hiding the $('#lastPostsLoader') in the else part ???
From what I understand is that you are hiding the loader if you dont get any data.
#pavan
if ($('#data')) {
//if you have data process your business logic.
}
else
{
//Hide the loader.
//remove the event handler you can use .off for it.
}
For removing event handler http://api.jquery.com/off/
Related
I'm using scrolling instead of pagination but my problem is that it still loading even the data already there and no more data found, so the scrolling down will never stop, and I think because I can't set the condition that if reached to the last page then stop loading
to check if the json html is empty is difficult because it contains html divs
I hope you can help me to reach to the end of content then stop scrolling
var page = 1;
$(window).scroll(function() {
if($(window).scrollTop() + $(window).height() >= $(document).height()) {
page++;
loadMoreData(page);
}
});
function loadMoreData(page) {
$.ajax({
url: '?page=' + page,
type: "get",
beforeSend: function() {
$('.ajax-load').show();
}
}).done(function(data) {
if(page == " ") {
$('.ajax-load').html("No more records found");
return;
}
$('.ajax-load').hide();
$("#load_data").append(data.html);
}).fail(function(jqXHR, ajaxOptions, thrownError) {
alert('server not responding...');
});
}
/*Show Hide Cousines*/
$('#showcuisine').on('click', function (event) {
event.preventDefault();
$(".cuisines").show();
$("#showcuisine").hide();
$("#hidecuisine").show();
});
$('#hidecuisine').on('click', function (event) {
event.preventDefault();
var allcuisines = jQuery('.cuisines');
for (var i = 5; i < allcuisines.length; i++) {
$('#cuisine' + i).hide();
}
$("#showcuisine").show();
$("#hidecuisine").hide();
});
Controller
if ($request->ajax()) {
$view = view('store-search.listing', compact(
'stores','storedays','cuisines'
))->render();
return response()->json(['html'=>$view]);
}
When there is no more data to receive you can return null or false instead of view.
Then replace
if(page == " ") {
$('.ajax-load').html("No more records found");
return;
}
with:
if(!data) {
$('.ajax-load').html("No more records found");
return;
}
You should also include a variable isLastPageLoaded = false and set it to true wen last page is reached. Before making new AJAX request you should check if this is still false. If it's true then you don't need to load new records.
Do I understand correctly that already existing records get duplicated?
check with if condition on api side if zero record fetching then return null.
and then put this on your ajax done function
if(data == null) {
$('.ajax-load').html("No more records found");
return;
}
Solved,
I have to put the foreach in a div with no other html up to the foreach
Please help,
I have a dynamically generated set of button-incremented inputs. First i store id's and values into localstorage, and everything goes fine and i can see all the id-value pairs, but i cannot send the data using AJAX call.
Here's what it looks like:
The AJAX is assigned on button click:
<script>
$("#send_order").click(function (e) {
if (localStorage) {
if (localStorage.length) {
for (var i = 0; i < localStorage.length; i++) {
var pid = localStorage.key(i);
var value = localStorage.getItem(localStorage.key(i));
$.ajax({
url: "update.php?pid="+pid+"&qty="+value,
success: function(){
alert( "Прибыли данные: ");
}
});
}
} else {
output += 'Нет сохраненных данных.';
}
} else {
output += 'Ваш браузер не поддерживает локальное хранилище.';
}
)};
</script>
But nothing happens when the button is clicked.
What i do wrong?
While your code looks fine it is little inefficient to send your localstorage data one by one in a loop. It makes more sense to convert your localstorage to a json string and send everything at the same time. You can json_decode the json string in your php update script. Also I included a function to test if localStorage is available by trying to write in it. This is more reliable then if(localStorage)
$("#send_order").on("click", function () {
var output='';
if(localStorageTest() === true){
console.log('localStorage is available');
if(localStorage.length){
var data=JSON.stringify(localStorage);
$.ajax({
type: "GET",
url: "update.php?data="+data,
success: function(){
alert( "your data is send correctly!");
}
});
}else{
output += 'localStorage is empty\n';
}
}else{
output += 'localStorage is not available\n';
}
})
function localStorageTest(){
var test = "test";
try {
localStorage.setItem(test, test);
localStorage.removeItem(test);
return true;
} catch(e) {
return false;
}
}
I have a simple installer that's divided in segments, not by syntax, but just by logic. Here's how it works:
if ($_POST['install'] == "Install")
{
// fetches user values
// creates tables
// creates some files
// creates some emails
// inserts relevant stuff into the database
// finishes
}
The code is too long and unnecessary for this question. Each of those steps counts as 20% complete for the installation, how would I make a progress bar displaying the info to the user? I'd like this for two reasons, one is for them to keep track, other is for them to know they shouldn't close the browser tab before it's done.
Now my idea is to assign a variable to each part of the code, for instance $done = 20% in the first, $done = 40% in the second etc, and simply show progress bar based on that variable. The the only thing I don't know is how to show the progress bar?
Thanks
My recommended solution:
Create separate ajax requests for each step in your process like so...
// do first step
$.ajax({
url: myUrl + '?step=1',
success: function() {
// update progress bar 20%
}
});
// do second step
$.ajax({
url: myUrl + '?step=2',
success: function() {
// update progress bar 40%
}
});
// etc.
If you want to be DRY, try this:
var steps = 5;
for (var i = 1; i <= steps; i++) {
$.ajax({
url: myUrl + '?step=' + i;
success: function() {
// update success incrementally
}
});
}
With jQuery UI progressbar:
$(function() {
$("#progressbar").progressbar({
value: 0
});
var steps = 5;
for (var i = 1; i <= steps; i++) {
$.ajax({
url: myUrl + '?step=' + i;
success: function() {
// update success incrementally
$("#progressbar").progressbar('value', i * 20);
}
});
}
});
Ref. http://jqueryui.com/progressbar/#default
The best practice is to store the progress value in a db or a key-value storage system such as APC, Memcache or Redis. And then retrieve the progress with an ajax query.
A good jquery plugin is progressbar bar from jQuery-ui, and you can use json to encode the progress value:
// GET /ajax/get-status.json
{
"progress":10,
"error":"",
"warning":""
}
The page:
<div id="error" style="color: red"></div>
<div id="warning" style="color: yellow"></div>
<div id="message"></div>
<div id="progressbar"></div>
<script type="text/javascript">
jQuery(document).ready(function() {
$("#progressbar").progressbar({ value: 0 });
$.ajaxSetup({ cache: false });
function updateProgress() {
jQuery.getJSON("/ajax/get-status.json", function(response) {
if (response.error) {
$("#error").html( response.error );
return;
} else {
$("#progressbar").progressbar( 'value', parseInt( response.progress ) ); // Add the new value to the progress bar
$("#message").html( response.message );
$("#warning").html( response.warning );
if(parseInt( response.progress ) < 100){
setTimeout(updateProgress, 1);
}
}
});
}
updateProgress();
});
</script>
You can use an HTML5 progress bar.
Send ajax request and return the percent complete.
Change the progress tag's value.
<progress id='p' max="100" value="50"></progress>
I have problem with the site I'm developing. The dynamically loaded div (ajax) is empty in IE9 and works poorly on firefox (php doesn't compile) and I can read the source of my php file in the div.
I've tried a lot of solutions like changing from GET to POST or adding a unique id to the url or making an async request but the content is absolutely empty. Any ideas? thanks
function pageload(hash) {
if(hash == '' || hash == null)
{
document.location.hash = "#php"; // home page
}
if(hash)
{
getPage();
}
}
function getUniqueTime() {
var time = new Date().getTime();
while (time == new Date().getTime());
return new Date().getTime();
}
function getPage() {
var str = getUniqueTime();
console.log(str);
var data = 'page=' + encodeURIComponent(document.location.hash);
$('#content').fadeOut(200);
$.ajax({
url: "loader.php?_=" + str,
type: "POST",
data: data,
cache: false,
success: function (html) {
$('#content').fadeIn(200);
$('#content').html(html);
}
});
}
EDIT:
//loader.php
<?
require_once('session.class.php');
require_once('user.class.php');
$se = new session();
$lo = new user();
$se->regenerate();
if(isset($_POST))
{
$alpha = (string) $_POST['page'];
if($alpha == '#php')
{
include 'homeloader.php';
}
else if($alpha == '#cplus')
{
include 'cplusloader.php';
}
else if($alpha == '#web')
{
include 'underloader.php';
}
else if($alpha == '#about')
{
include 'underloader.php';
}
else if($alpha == '#social')
{
include 'socialloader.php';
}
}
else
$page = 'error';
echo $page;
?>
try this:
//on click of a button:
$("#button").live("click", function(){
//get you string data
var str = "test";
//do new version of ajax
$.post("loader.php", {str:str}, function(html){
$('#content').html(html);
});
});
and you dont need to do AJAX method anymore $.post works amazing
php doesn't compile? async request? actually not specifying ascync: true the request is executed asyncroniously and in version jQuery 1.8 there is no sync AJAX requests at all. Attach an error handler and you will see that your request probably results an error:
...
cache: false,
success: function (html) {
$('#content').fadeIn(200);
$('#content').html(html);
},
error: function (a,b) {
alert('Error!');
}
...
Normally AJAX consists of 2 parts - client side and server side. I don't see serverside posted in your question. You have to check both of them. Make a simple loader.php returning the string success and get rid of all extra get params. First test your php file in browser to be sure that it works. Check FireBug for javascript errors ...
I have this
"fsField" is the class of all elements in the form. So whenever the user blurs to another field it submits the form using the function autosave() - given below. It saves data when the user blurs but when the user clicks the button with class "save_secL" to go to next page it does not save.
$('.fsField').bind('blur', function()
{
autosave();
}
});
but when i use this code
$('.save_secL').click(function()
{
var buttonid = this.id;
{
var answer = confirm("You have left some questions unanswered. Click OK if you are sure to leave this section? \\n Click CANCEL if you want stay in this section. ");
if(!answer)
{
var spl_items = valid().split(',');
$(spl_items[0]).focus();
return false;
}
else
{
$('#hidden_agree').append('<input id="secLuseragreed" name="secL_user_agreed" value="unanswered" type="hidden" />');
autosave();
window.location= buttonid+".php"
}
}
else
{
$('#hidden_agree').append('<input id="secLuseragreed" name="secL_user_agreed" value="answered all" type="hidden" />');
autosave();
window.location= buttonid+".php"
}
}
});
**autosave_secL.php is the php source thats saving the data in the database. I ran it independently and it does save data okay. **
function autosave()
{
var secL_partA_ques_1_select = $('[name="secL_partA_ques_1_select"]').val();
var secL_partA_ques_1 = $('[name="secL_partA_ques_1"]:checked').val();
var secL_partA_ques_2_select = $('[name="secL_partA_ques_2_select"]').val();
$.ajax(
{
type: "POST",
url: "autosave_secL.php",
data: "secL_partA_ques_1_select=" + secL_partA_ques_1_select + "&secL_partA_ques_1=" + secL_partA_ques_1 + "&user_id=<?php echo $row_token[user_id]?>" + "&updated_by=<?php echo $member."-".$key;?>",
cache: false,
success: function()
{
$("#timestamp").empty().append('Data Saved Successfully!');
}
});
}
**
valid() is a validation function that checks if any field is empty and returns a value if there is an empty field.**
function valid()
{
var items = '';
$('.fsField').each(function()
{
var thisname = $(this).attr('name')
if($(this).is('select'))
{
if($(this).val()=='')
{
var thisid = $(this).attr('id')
items += "#\"+thisid+\",";
$('[name=\"'+thisname+'\"]').closest('td').css('background-color', '#B5EAAA');
}
}
else
{
$('[name=\"'+thisname+'\"]').closest('td').css('background-color', '');
}
});
return items;
}
Can anyone please help? i am stuck for a day now. Can't understand why it saves when the user goes field to field but does not save when button is clicked with validation.
Tested with Firefox. this line appears in red with a Cross sign beside when the button(save_secL class) is clicked. I am using a ssl connection.
POST https://example.com/files/autosave_secL.php x
Here is the modified code trying to implement the solution
$('#submit_survey_secL').click(function()
{
if(valid() !='')
{
var answer = confirm("You have left some questions unanswered. Are you sure you want to Submit and go to Section B? ");
if(!answer)
{
var spl_items = valid().split(',');
$(spl_items[0]).focus();
return false;
}
else
{
$('#hidden_agree').append('<input id=\"secLuseragreed\" name=\"secL_user_agreed\" value=\"unanswered\" type=\"hidden\" />');
autosave(function(){
window.location= "part1secM.php?token=1&id=4"
});
}
}
else
{
$('#hidden_agree').append('<input id=\"secLuseragreed\" name=\"secL_user_agreed\" value=\"unanswered\" type=\"hidden\" />');
autosave(function(){
window.location= "part1secM.php?token=1&id=6"
});
}
});
function autosave(callback)
{
var secL_partL_ques_1_select = $('[name="secL_partL_ques_1_select"]').val();
var secL_partL_ques_1 = $('[name="secL_partL_ques_1"]:checked').val();
var secL_partL_ques_2_select = $('[name="secL_partL_ques_2_select"]').val();
$.ajax(
{
type: "POST",
url: "autosave_secL.php",
data: "secL_partL_ques_1_select=" + secL_partL_ques_1_select + "&secL_partL_ques_1=" + secL_partL_ques_1 + "&user_id=<?php echo $row_token[user_id]?>" + "&updated_by=<?php echo $member."-".$key;?>",
cache: false,
success: function()
{
$("#timestamp").empty().append('Data Saved Successfully!');
if($.isFunction(callback))
{
callback();
}
}
});
}
I don't understand why this doesn't work as callback should totally work. Firebug does not show POST https://example.com/files/autosave_secL.php in red any more but it shows that it has posted but I think the callback is not triggering for some reason
$('.save_secL').click(function() {
//...
//start autosave. Note: Async, returns immediately
autosave();
//and now, before the POST request has been completed, we change location...
window.location= buttonid+".php?token=$row_token[survey_token]&$member=$key&agr=1"
//....and the POST request gets aborted :(
Solution:
function autosave(callback)
{
//...
$.ajax(
{
//...
success: function()
{
$("#timestamp").empty().append('Data Saved Successfully!');
if($.isFunction(callback))
callback();
}
});
}
//and
autosave(function(){
window.location= buttonid+".php?token=$row_token[survey_token]&$member=$key&agr=1"
});
By the way, your autosave function is pretty hard for your server. Did you consider using localStorage + a final POST request containing all data?
I got the solution.
It might be one of the several. scr4ve's solution definitely helped. So here are the points for which I think its working now.
Moved "cache: false, " and removed "async:false" before url: in the ajax autosave function. Before I was putting it after "data: "
Added a random variable after autosave_secL.php/?"+Match.random()
Added scr4ve's solution so that POST is completed before redirect