alm/src/app/utils/preventBackspaceNav.ts

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// Prevent the backspace key from navigating back.
// http://stackoverflow.com/a/2768256/390330
export var preventBackspaceNav = function() {
    document.addEventListener('keydown', function(event: any) {
        var doPrevent = false;
        if (event.keyCode === 8) {
            var d = event.srcElement || event.target;
            if ((d.tagName.toUpperCase() === 'INPUT' &&
                (
                    d.type.toUpperCase() === 'TEXT' ||
                    d.type.toUpperCase() === 'PASSWORD' ||
                    d.type.toUpperCase() === 'FILE' ||
                    d.type.toUpperCase() === 'SEARCH' ||
                    d.type.toUpperCase() === 'EMAIL' ||
                    d.type.toUpperCase() === 'NUMBER' ||
                    d.type.toUpperCase() === 'DATE')
            ) ||
                d.tagName.toUpperCase() === 'TEXTAREA') {
                doPrevent = d.readOnly || d.disabled;
            }
            else {
                doPrevent = true;
            }
        }

        if (doPrevent) {
            event.preventDefault();
        }
    });
}