What is the best way to display a specific number of list items using AngularJS?

Question

What is the best way to display a specific number of list items using AngularJS?

My goal is to display 3 li elements initially, and after a delay of 1 second, these 3 li items will slide up while the next set of 3 li elements automatically appear in the div.#content.

<div id="content">
    <ul>
        <li>122</li>
        <li>first</li>
        <li>second</li>
        <li>third</li>
        <li>fourth</li>
        <li>fifth</li>
        <li>sixth</li>
    </ul>
</div>

I was able to achieve this using jquery, but I am now looking to implement it with angularJs. However, I am not very experienced with angularjs. If anyone could offer some guidance, I would greatly appreciate it. You can view the current implementation using jquery here.

javascript angularjs

Answer 1

Answer №1

If you're only dealing with translation, then execute the code snippet

(function ()
{
    var app = angular.module("app", []);

    function HomeController($interval)
    {
        var vm = this;        
        var i = 2,
            $ul = angular.element('#content ul');
        int = $interval(function ()
            {
                angular.element('li', $ul).slideUp();
                angular.element('li' + (i == -1 ? '' : ':gt(' + i + ')') + ':lt(3)', $ul).slideDown();
                i += 3;
                if (i + 1 >= angular.element('li', $ul).length) i = -1;
            },
            2000);
    }

    app.controller("HomeController", ["$interval",HomeController]);

})();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!DOCTYPE html>
<html lang="en" ng-app="app">
    <head>
        <meta charset="UTF-8">
        <title>Angular JS App</title>        
    </head>
    <body>

        <div class="container" ng-controller="HomeController as homeCtrl">


            <div id="content">
                <ul>
                    <li>1</li>
                    <li>2</li>
                    <li>3</li>
                    <li>4</li>
                    <li>5</li>
                    <li>6</li>
                    <li>7</li>
                    <li>8</li>
                    <li>9</li>
                </ul>
            </div>           

        </div>
    </body>
</html>

Answer 2

If you're only dealing with translation, then execute the code snippet

(function ()
{
    var app = angular.module("app", []);

    function HomeController($interval)
    {
        var vm = this;        
        var i = 2,
            $ul = angular.element('#content ul');
        int = $interval(function ()
            {
                angular.element('li', $ul).slideUp();
                angular.element('li' + (i == -1 ? '' : ':gt(' + i + ')') + ':lt(3)', $ul).slideDown();
                i += 3;
                if (i + 1 >= angular.element('li', $ul).length) i = -1;
            },
            2000);
    }

    app.controller("HomeController", ["$interval",HomeController]);

})();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<!DOCTYPE html>
<html lang="en" ng-app="app">
    <head>
        <meta charset="UTF-8">
        <title>Angular JS App</title>        
    </head>
    <body>

        <div class="container" ng-controller="HomeController as homeCtrl">


            <div id="content">
                <ul>
                    <li>1</li>
                    <li>2</li>
                    <li>3</li>
                    <li>4</li>
                    <li>5</li>
                    <li>6</li>
                    <li>7</li>
                    <li>8</li>
                    <li>9</li>
                </ul>
            </div>           

        </div>
    </body>
</html>

Answer 3

Answer №2

Take a look at this Plunker. I have eliminated jQuery and implemented some mathematical logic instead.

let index = 0;

    const mainList=[1,2,3,4,5,6,7,8,9];

    $scope.list = [mainList[index], mainList[index+1], mainList[index+2]];

    $ul = angular.element('#content ul');

    interval = $interval(function ()
        {
             if(index > 8){
              index = 0;
            }
            $scope.list = [mainList[index], mainList[index+1], mainList[index+2]];
        },
        2000);

Answer 4

Take a look at this Plunker. I have eliminated jQuery and implemented some mathematical logic instead.

let index = 0;

    const mainList=[1,2,3,4,5,6,7,8,9];

    $scope.list = [mainList[index], mainList[index+1], mainList[index+2]];

    $ul = angular.element('#content ul');

    interval = $interval(function ()
        {
             if(index > 8){
              index = 0;
            }
            $scope.list = [mainList[index], mainList[index+1], mainList[index+2]];
        },
        2000);

Answer 5

Answer №3

Give this a shot:

angular.module('app', [])
    .directive('slideRoller',function($interval){
        return {
            restrict:'A',
            link:function(scope,ele,attrs){
                var interval = attrs.interval || 2000;
                var children = ele.find('li');

                var start = -1;
                roll(start);
                $interval(function(){
                    start += 3;
                    if(start>=children.length-3){
                        start = -1;
                    }
                    roll(start);
                },interval);

                function roll(i){
                    angular.forEach(children,function(val,index){
                        if(index>i && index<=i+3){
                            angular.element(val).removeClass('slide-up').addClass('slide-down');
                        }else{
                            angular.element(val).removeClass('slide-down').addClass('slide-up');
                        }
                    });
                }
            }
        }
    })
;

.slide-up{
max-height: 0;
overflow-y: hidden;
}

.slide-down {
max-height: 10em;
-webkit-transition: max-height 0.5s ease-in-out;
-moz-transition: max-height 0.5s ease-in-out;
-o-transition: max-height 0.5s ease-in-out;
transition: max-height 0.5s ease-in-out;
}

<html>
<head>
    <title>Example Page</title>
    <script src="//cdn.bootcss.com/angular.js/1.4.7/angular.js"></script>

</head>

<body ng-app="app">
    <div class="container">
        <ul slide-roller interval="1000">
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li>6</li>
            <li>7</li>
            <li>8</li>
            <li>9</li>
        </ul>
    </div>
</body>
</html>

Answer 6

Give this a shot:

angular.module('app', [])
    .directive('slideRoller',function($interval){
        return {
            restrict:'A',
            link:function(scope,ele,attrs){
                var interval = attrs.interval || 2000;
                var children = ele.find('li');

                var start = -1;
                roll(start);
                $interval(function(){
                    start += 3;
                    if(start>=children.length-3){
                        start = -1;
                    }
                    roll(start);
                },interval);

                function roll(i){
                    angular.forEach(children,function(val,index){
                        if(index>i && index<=i+3){
                            angular.element(val).removeClass('slide-up').addClass('slide-down');
                        }else{
                            angular.element(val).removeClass('slide-down').addClass('slide-up');
                        }
                    });
                }
            }
        }
    })
;

.slide-up{
max-height: 0;
overflow-y: hidden;
}

.slide-down {
max-height: 10em;
-webkit-transition: max-height 0.5s ease-in-out;
-moz-transition: max-height 0.5s ease-in-out;
-o-transition: max-height 0.5s ease-in-out;
transition: max-height 0.5s ease-in-out;
}

<html>
<head>
    <title>Example Page</title>
    <script src="//cdn.bootcss.com/angular.js/1.4.7/angular.js"></script>

</head>

<body ng-app="app">
    <div class="container">
        <ul slide-roller interval="1000">
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li>6</li>
            <li>7</li>
            <li>8</li>
            <li>9</li>
        </ul>
    </div>
</body>
</html>

Answer 7

Answer №4

Here's some helpful information for you:

If you decide to import jQuery, AngularJs will incorporate it, making it acceptable to use jQuery.

However, if you choose not to import jQuery, AngularJs will utilize jQlite instead, which is very similar to jQuery.

According to the official documentation:

Does Angular depend on the jQuery library? Yes, Angular can make use of jQuery if it exists in your app at bootstrap time. If jQuery is unavailable, Angular will default to its own implementation known as jQLite that mirrors a subset of jQuery.

It is important to note that Angular 1.3 only supports jQuery version 2.1 or higher. While jQuery 1.7 and newer may function correctly with Angular, it is not guaranteed.

For more details, visit the FAQ page: https://docs.angularjs.org/misc/faq

Learn about Angular jqLite here: https://docs.angularjs.org/api/ng/function/angular.element

Answer 8

Here's some helpful information for you:

If you decide to import jQuery, AngularJs will incorporate it, making it acceptable to use jQuery.

However, if you choose not to import jQuery, AngularJs will utilize jQlite instead, which is very similar to jQuery.

According to the official documentation:

Does Angular depend on the jQuery library? Yes, Angular can make use of jQuery if it exists in your app at bootstrap time. If jQuery is unavailable, Angular will default to its own implementation known as jQLite that mirrors a subset of jQuery.

It is important to note that Angular 1.3 only supports jQuery version 2.1 or higher. While jQuery 1.7 and newer may function correctly with Angular, it is not guaranteed.

For more details, visit the FAQ page: https://docs.angularjs.org/misc/faq

Learn about Angular jqLite here: https://docs.angularjs.org/api/ng/function/angular.element

What is the best way to display a specific number of list items using AngularJS?

Answer №1

Answer №2

Answer №3

Answer №4

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