Progressive loading in ng-repeat for images, angular js

Question

How do I implement progressive loading of content as you scroll down the page? Otherwise 1000 images would load at the same time.

Answer 1

Use infinite scrolling directive. ngInfiniteScroll

DEMO

---

HTML

<div ng-app='myApp' ng-controller='DemoController'>
  <div infinite-scroll='loadMore()' infinite-scroll-distance='2'>
    <img ng-repeat='image in images' ng-src='http://placehold.it/225x250&text={{image}}'>
  </div>
</div>

JS

var myApp = angular.module('myApp', ['infinite-scroll']);
myApp.controller('DemoController', function($scope) {
  $scope.images = [1, 2, 3, 4, 5, 6, 7, 8];

  $scope.loadMore = function() {
    var last = $scope.images[$scope.images.length - 1];
    for(var i = 1; i <= 8; i++) {
      $scope.images.push(last + i);
    }
  };
});

Answer 2

I didn't want to use ngInfiniteScroll the other guy posted as my mobile app does not use jQuery so there is no point in loading it just for this.

Anyhow, I found a jsfiddle with pure Javascript that solves this problem.

HTML

<div id="fixed" when-scrolled="loadMore()">
    <ul>
        <li ng-repeat="i in items"></li>
    </ul>
</div>

JavaScript

function Main($scope) {
    $scope.items = [];
    var counter = 0;
    $scope.loadMore = function() {
        for (var i = 0; i < 5; i++) {
            $scope.items.push({
                id: counter
            });
            counter += 10;
        }
    };
    $scope.loadMore();
}

angular.module('scroll', []).directive('whenScrolled', function() {
    return function(scope, elm, attr) {
        var raw = elm[0];
        elm.bind('scroll', function() {
            if (raw.scrollTop + raw.offsetHeight >= raw.scrollHeight) {
                scope.$apply(attr.whenScrolled);
            }
        });
    };
});

Source: http://jsfiddle.net/vojtajina/U7Bz9/

Answer 3

Ben Nadel has a good solution for this, where he takes in account both window and document resizing. He also avoids a repaint after every ng-repeat node. Check it out.

Answer 4

I've created a module that does roughly the same as ngInfiniteScroll, but does not depend on jQuery. It does take window resizing into account. ngInfiniteScroll wasn't performing properly in my application so I've build my own and it's a lot lighter.

https://github.com/Bram77/su-endless-scroll