How to set a Default Filter

When enter the page, I want to filter a default value before searching, i tried with onload , but i not sure how to work with onload and keyup together. Currently , the keyup filter function is works but i want to add a onload to let first times the page load with a default value filter.

HTML

<label>Search:<input type="search" id="searching" value="default-value"></label>

Script

<script>

$(document).ready(function(){
$("#searching").on("keyup", function() {
  var value = $(this).val().toLowerCase();
  $("#Table1body tr").filter(function() {
    $(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
  });
});
});
</script>