Infinite scrolling with Meteor - meteor

Question

I am trying to load 12 items only each time, until the user scroll all the way down and load another 12 elements
For some reason my code doesn't work. When i upload another item, i can see it in the admin panel so it is successfully uploaded but i can't see it in the normal user view. i can only view the first 12 items uploaded and it doesn't load anymore items when i scroll.
Here is my code in the client side
if (Meteor.isClient) {
var ITEMS_INCREMENT = 12; //this one refers to the number of elements to load
Session.setDefault('itemsLimit', ITEMS_INCREMENT);
Deps.autorun(function() {
Meteor.subscribe('items', Session.get('itemsLimit'));
});
Template.list_products.helpers({
applications: function () {
var limit = Session.get("itemsLimit");
//return Products.find({}, { sort: {createdAt: -1},limit: limit }); // render latest first
return Products.find({}, { sort: {createdAt: 1},limit: limit }); // render first first
}
});
Template.list_products.moreResults = function() {
// If, once the subscription is ready, we have less rows than we
// asked for, we've got all the rows in the collection.
return Products.find({}, { sort: {createdAt: -1},limit: limit });
}
// whenever #showMoreResults becomes visible, retrieve more results
function showMoreVisible() {
var threshold, target = $("#showMoreResults");
if (!target.length) return;
threshold = $(window).scrollTop() + $(window).height() - target.height();
if (target.offset().top < threshold) {
if (!target.data("visible")) {
// console.log("target became visible (inside viewable area)");
target.data("visible", true);
Session.set("itemsLimit",
Session.get("itemsLimit") + ITEMS_INCREMENT);
}
} else {
if (target.data("visible")) {
// console.log("target became invisible (below viewable arae)");
target.data("visible", false);
}
}
}
// The below line is to run the above func every time the user scrolls
$(window).scroll(showMoreVisible);
}

Answer 1

Here how i solved it:
if(Meteor.isClient) {
Session.set("itemsLimit", 9); // to set the limit to 9
lastScrollTop = 0;
$(window).scroll(function(event){
if($(window).scrollTop() + $(window).height() > $(document).height() - 100) { // to detect scroll event
var scrollTop = $(this).scrollTop();
if(scrollTop > lastScrollTop){ // detect scroll down
Session.set("itemsLimit", Session.get("itemsLimit") + 9); // when it reaches the end, add another 9 elements
}
lastScrollTop = scrollTop;
}
});
}
It works like a charm now :)

Answer 2

You can implement it like this:
HTML File:
<template name="yourTemplateName">
<div id="divId">
{{#each dataArr}}
//your view here.
{{/each}}
</div>
{{#if noMoreItem}}
<span>No more items to show</span>
{{/if}}
</template>
JS File:
var pageNumber = new ReactiveVar(0);
var noMoreItem = new ReactiveVar(false);
var mainContainer = // Your element here example: document.getElementById('divId')
mainContainer.addEventListener('scroll', function(){
if(mainContainer.scrollHeight - mainContainer.scrollTop === mainContainer.clientHeight) {
getMoreItems();
}
});
var getMoreItems = function () {
if(pageNumber.get() < Math.floor(Counts.get('countItems')/12)) {
pageNumber.set(Number(pageNumber.get())+1);
Meteor.subscribe('pubName', pageNumber.get(), 12);
} else {
noMoreItem.set(true);
}
}
Template.yourTemplateName.rendered = function () {
pageNumber.set(0);
Meteor.subscribe('pubName', pageNumber.get(), 12);
}
Template.yourTemplateName.helpers({
'dataArr': function () {
return CollectionName.find();
},
'noMoreItem': function () {
return noMoreItem.get();
}
})
Publication:
Meteor.publish("pubName", function (pageNumber, pageSize) {
Counts.publish(this, 'countItems', Meteor.users.find(filter), {
noReady: true
});
return CollectionName.find({}, {
skip: pageNumber > 0 ? ((pageNumber) * pageSize) : 0,
limit: pageSize
})
});