ng-disabled is failing to interact with the $scope variable

Attempting something like this:

<button class="btn btn-lg btn-block btn-section"
     ng-disabled="{{ selectedfruits.length }} < 5" > Show selected fruits</button>

When inspecting in Chrome developer tools, the code appears as follows:

<button class="btn btn-lg btn-block btn-section" 
    ng-disabled="0 < 5">
        Show selected fruits</button>

Despite this, the button remains enabled. Below is the snippet of my controller:

.controller('fruitSelectorController',
     function ($scope, $rootScope, $timeout) { 
    $scope.fruits = ['a', 'b', 'c', 'd', 'e'];
                $scope.selectedfruits = [];
    });

Answer №1

Make sure to avoid using interpolation when writing code with {{ }}. The system will automatically interpret the content and execute the expression as needed.

ng-disabled="selectedfruits.length < 5"

For more information, refer to the Official Documentation

Answer №2

Make sure to remove the curly braces from ng-disabled as it is not necessary. Avoid evaluating arrays in the view HTML, as the scope variable automatically does this for you. Angular's two-way binding feature ensures that the view will be updated automatically.

<button class="btn btn-lg btn-block btn-section" ng-disabled=" selectedfruits.length  < 5" > Show selected fruits</button>

Answer №3

<!DOCTYPE html>
<html lang="en-US">
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body ng-app="myApp" ng-controller="fruitSelectorController">
<button ng-disabled="selectedfruits.length  < 5">Test Button</button>
</body>
<script type="text/javascript">
    angular.module('myApp',[]).controller('fruitSelectorController', function ($scope) 
    { 
        $scope.fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
        $scope.selectedfruits = ['orange'];
    });
</script>
</html>

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