Javascript Code Doesn't Work After Putting The Code As External File

I'm applying a Javascript (JS) code for bootstrap modal(popup window) in my page. I'm planning to let it run dynamically as i enter an input into the textbox that appears from the

Solution 1:

try putting your code in document.ready

$(document).ready(function () {
     // New Modal ================================================
     $('#inputNew').on('hidden.bs.modal', function (e) {
         document.getElementById("input").checked = true;
     });
})