searchfilter.js

jQuery(document).ready(function($) {
  $("#myInput").on("keyup", function() {
    var value = $(this).val().toLowerCase();
    //Select all article and show
    $("article > div").show().filter(function() {        
        //Find h3 and p also check if the value is substring of the text. Return true if not found.
      return $(this).find('h3,p').text().toLowerCase().indexOf(value) === -1; 
    }).hide();
    //Hide all h3 and p that that the value is not the substring of text
  });
});