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							<header>
    GetElementById Throw
</header>

<body>
    <div id="xId">
        <div id="testId">testDiv</div>
    </div>
    <script>
        const getElementById = (parent, id) => {
            try {
                walker(parent, id);
                return null;
            }
            catch (e) {
                if (e.message == "Element found.")
                    return e.result;
                else
                    throw e;
            }
        }
        function walker(parent, id) {
            let isObject = true;
            if (Array.isArray(parent)) {
            }
            else if (parent != null && typeof parent === "object") {
                if (parent.id == id) {
                    let err = new Error("Element found.");
                    err.result = parent;
                    throw err;
                }
            }
            else
                isObject = false;
            if (isObject) {
                for (child of parent.children) {
                    walker(child, id);
                }
            }
        }
        var children = xId.children;
        var val = xId.value;
        el = getElementById(document.body, "testId");
        alert(el.innerText);
    </script>
</body>