Angular ng-class performance issue when too many elements in DOM

angularjs, html, javascript

Solution

Finally I found the solution and it will helps lot to improve performance in angular js.

If your model changes dynamically and if you have lots of data and then also it improve AngularJS pages rendering up to 1000% and more - no kidding !.

Fore more information you can visit : http://orangevolt.blogspot.in/2013/08/superspeed-your-angularjs-apps.html

Follow the steps:

- download the library from the link:library

2.example without library:(check your console)

function MyController( $scope) {
    var entries = [ 
        { label : 'one', value : 'first entry'}, 
        { label : 'two', value : 'second entry'}, 
        { label : 'three', value : 'third entry'}
    ];
    
    $scope.label ="";
    $scope.value ="";
    $scope.order = 'label';
    
    $scope.add = function() {
        entries.push({ 
            label : $scope.label, 
            value : $scope.value
        });
    };
        
    $scope.getEntries = function() {
        console && console.log( "getEntries() called");
        return entries;
    };
}

<script src="https://raw.githubusercontent.com/lodash/lodash/2.4.1/dist/lodash.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script>

<form name="myform" ng-app ng-controller="MyController">
    Label/Value :
    <input type="text" required ng-model="label">
    <input type="text" required ng-model="value">
    <button 
        ng-disabled="!myform.$valid" 
        ng-click="add()"
    >Add</button>
        
    <fieldset>    
        <legend>
            Entries sorted by 
            <select 
                ng-model="order" 
                ng-options="property for property in [ 'label', 'value']">
            </select>
        </legend>
        <div ng-repeat="entry in getEntries() | orderBy:order">
            {{entry.label}} = "{{entry.value}}"
        </div>
    </fieldset>
</form>

3.example with library:(check your console)

function MyController( $scope) {
    var entries = [ 
        { label : 'one', value : 'first entry'}, 
        { label : 'two', value : 'second entry'}, 
        { label : 'three', value : 'third entry'}
    ];
    
    $scope.label ="";
    $scope.value ="";
    $scope.order = 'label';
    
    $scope.add = function() {
        entries.push({ 
            label : $scope.label, 
            value : $scope.value
        });
            // clear cache
        $scope.getEntries.cache = {};
    };
        
    $scope.getEntries = _.memoize( 
        function() {
            console && console.log( "getEntries() sorted by '" + $scope.order + " 'called");
                // return entries sorted by value of $scope.order
            return _.sortBy( entries, $scope.order);
        }, 
        function() { 
                // return the cache key for the current result to store 
            return $scope.order;
        }
    );
}

<script src="https://raw.githubusercontent.com/lodash/lodash/2.4.1/dist/lodash.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.20/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script>

<form name="myform" ng-app ng-controller="MyController">
    Label/Value :
    <input type="text" required ng-model="label">
    <input type="text" required ng-model="value">
    <button 
        ng-disabled="!myform.$valid" 
        ng-click="add()"
    >Add</button>
        
    <fieldset>    
        <legend>
            Entries sorted by 
            <select 
                ng-model="order" 
                ng-options="property for property in [ 'label', 'value']">
            </select>
        </legend>
        <div ng-repeat="entry in getEntries()">
            {{entry.label}} = "{{entry.value}}"
        </div>
    </fieldset>
</form>

Problem

Original source