Call angularjs function using jquery/javascript

Solution provide in the questions which you linked is correct. Problem with your implementation is that You have not specified the ID of element correctly.

Secondly you need to use load event to execute your code. Currently DOM is not loaded hence element is not found thus you are getting error.

HTML

<div id="YourElementId" ng-app='MyModule' ng-controller="MyController">
    Hi
</div>

JS Code

angular.module('MyModule', [])
    .controller('MyController', function ($scope) {
    $scope.myfunction = function (data) {
        alert("---" + data);
    };
});

window.onload = function () {
    angular.element(document.getElementById('YourElementId')).scope().myfunction('test');
}

DEMO

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