navigator.clipboard.writetext('sdftgyuh') not working code example

Example: navigator.clipboard.writetext not working

$scope.CopyToClipBoard = function (text) {        
    if (navigator.clipboard != undefined) {//Chrome
        navigator.clipboard.writeText(text).then(function () {
            console.log('Async: Copying to clipboard was successful!');
        }, function (err) {
            console.error('Async: Could not copy text: ', err);
        });
    }
    else if(window.clipboardData) { // Internet Explorer
        window.clipboardData.setData("Text", text);
    }
};