Shiny.onInputChange is not a function

Question

I have code like is in my shiny app:

$(function() {
   Shiny.onInputChange('initialHash', parseHashQuery());
});

function parseHashQuery() {
  var result = {};
  location.hash.replace(/^#/, '').split('&').filter(Boolean).forEach(function(part) {
    var pair = part.split('=');
    result[pair[0]] = pair[1];
  });
  return result;
}

but I've got error:

common.js:59 Uncaught TypeError: Shiny.onInputChange is not a function
    at HTMLDocument.<anonymous> (common.js:59)
    at i (jquery.min.js:2)
    at Object.fireWith [as resolveWith] (jquery.min.js:2)
    at Function.ready (jquery.min.js:2)
    at HTMLDocument.K (jquery.min.js:2)

Answer 1

The solution was to use shiny event:

  $(document).on('shiny:sessioninitialized', function(event) {
    Shiny.onInputChange('initialHash', parseHashQuery());
  });

which was executed when Shiny.onInputChange was already defined.

Looking at the source code, Shiny is initialized in jQuery ready function but with timeout:

$(function() {
  // Init Shiny a little later than document ready, so user code can
  // run first (i.e. to register bindings)
  setTimeout(initShiny, 1);
});