Capturing Hierarchy Axis Changes to Document Property

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My friend recently asked an Interesting Question -
I have a chart where I am using a Hierarchy as Category Axis. I want to capture changes in that Axis (Hierarchy) to a Property Control. Is there a way to do this ?
Sounds interesting  🙃
Well , Let's start doing it !
  1. Add a Input field property enclosed in a span like below. Code in red is optional based on whether you need to display document property on not.
    <span id='AxisTracker' style='display:none;'>
      <SpotfireControl id="635a7ae743a14feb865833e75f3e9b4d" />
    </span>
  2. Add below JavaScript to capture changes. Here code in red indicates the possible states of Hierarchy Axis of interest

    function updateProperty(){
    $('.sf-element-text-box').each(function(index){
    //console.log($(this).text());
    switch($(this).text()){
        case "Geo (Region)":
        case "Geo (State)":
        case "Geo (City)":
    console.log($(this).text());
    $('#AxisTracker input').val($(this).text()).blur()
    break;
    }
    });}
    setInterval(updateProperty,500)
  3. This is pretty much all 🤓 
Using this approach helps in tracking changes to the Axis and we can trigger IronPython code as well on Document property change. 
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