Resolved promises can still fire

If you call then() on a resolved promise, your function still gets called.

by jdmarshall

HTML

<script src="https://code.angularjs.org/1.2.12/angular.js"></script>
<div ng-controller="MyCtrl">
    <h2>Promises can be triggered after they're resolved</h2>
    <div class="output">Promise fired: {{output}}</div>
    <div class="input">
        <button ng-click='doClick()'>Click me</button>
    </div>
</div>

CSS

body{
    padding: 10px;
}

.input, .output {
    padding: 10px;
}

.output {
    height: 20px;
}

JavaScript

var myApp = angular.module('myApp',[]);

function MyCtrl($scope, $q) {
    var deferred = $q.defer();
    var promise = deferred.promise;
    
    // Promise is already resolved, but you can still add a then()
    deferred.resolve("yes");

    $scope.doClick = function() {
        promise.then(function(value) {
            $scope.output = value;
        });    
    };
}