jQuery Input Field Filter

jquery-filter-by-field.js

$(".city-input").keyup(function() {
  filter(this);
});
function filter(element) {
  var value = $(element).val().toLowerCase();
  $("[data-filter]").each(function () {
    var $this = $(this),
    lower = $this.data("filter").toLowerCase();
    if (lower.indexOf(value) > -1) {
      $this.show();
    } else {
      $this.hide();
    }
  });
}