simplest cross-browser check if protocol handler is registered

Question

When user clicks link with custom protocol (like myapp://superlink)

I need either launch an app or allow user to download and run configuration app

Answer 1

Update to Korono's answer, this worked for me:

$(function() {
    var timeIndex;
    $("a[href*='myapp://']").blur(function(e)
    {
        clearTimeout(timeIndex);
    });

    $("a[href*='myapp://']").click(function(e)
    {
      var el = $(this);
      timeIndex = setTimeout(function() {
        window.location = el.attr("data-href-alt");
      }, 200);

      // once you do the custom-uri, it should properly execute the handler, otherwise, the settimeout that you set before will kick in
      window.location = el.attr("href");
      e.preventDefault();
    });
});