The performance of Ionic scroll is hindered by a slow response time coupled with a

I'm experiencing an issue where the page loads square by square when I scroll, which looks like this: https://i.sstatic.net/yHNLx.jpg

Here is the code snippet:

categoryList.html

<ion-header-bar align-title="center" class="bar-stable">
    <h1 class="title">Best Wishes App</h1>
</ion-header-bar>
<ion-content class="padding" overflow-scroll="true">
    <div class="list">
        <div class="card responsive-card" ng-repeat="item in data">
            <a href="#/sublist/{{item.id}}">
                <div class="item item-image">
                    <img ng-src="{{item.image}}" alt="item image">
                </div>
                <div class="item item-divider">
                    {{item.categoryTitle}}
                </div>
            </a>
        </div>
    </div>
</ion-content>

app.js

angular.module('starter', ['ionic'])            
        .config(function ($stateProvider, $urlRouterProvider) {
            $stateProvider
                .state('list', {
                    url: '/',
                    templateUrl: 'template/categoryList.html',
                    controller: 'ListController'
                })                    
            $urlRouterProvider.otherwise("/");
        })
        .controller('ListController', ['$scope', '$http', '$state', '$ionicHistory', '$rootScope', function ($scope, $http, $state, $ionicHistory, $rootScope) {                
            console.log($rootScope.data);
            $rootScope.$watch('data',function(){
                $scope.data = $rootScope.data;
            })
        }])

Since I'm new to Angular, please provide a detailed explanation in your answer. :/

I'm using version 1.7 of the ionic-framework

and my IDE is Visual Studio which leverages cordova CLI in the background to package and run the app.

Answer №1

For optimal performance, it is recommended to utilize ionics collection-repeat instead of ng-repeat when all elements share the same height.

Take a look at this demo: http://codepen.io/ionic/pen/0c2c35a34a8b18ad4d793fef0b081693

You can easily arrange two items side by side as demonstrated in your example.

Moreover, consider deactivating javascript scrolling in ionic to resolve any potential issues. Global configuration can be set in your config like this:

.config(function($ionicConfigProvider) {
  $ionicConfigProvider.scrolling.jsScrolling(false);
})

If the above solutions do not work, implementing a lazy loader for images can eliminate any lag. The ionic-image-lazy-load plugin, available on bower, is a reliable option that I have personally used to address similar flickering issues with images.

Plugin: https://github.com/paveisistemas/ionic-image-lazy-load

Example: http://codepen.io/mvidailhet/pen/yNOGzY

These suggestions aim to assist you in resolving the challenges you are facing. Good luck!

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