how to fire code on click with javascript code example

Example 1: how to open new form on button click in c# xamarin

private void button1Click(object sender, EventArgs e)
{            
     App.Current.MainPage = new settings();
}

Example 2: button not clicking for random jokes in javascript

<button id = "getQuote" class = "button" onclick="getElementById("quote").innerHTML = getRandomQuote()">