如果给出url-parameter，如何通过jQuery提交表单？

I am trying to make a form be submitted if there is a trigger-parameter in the url. I so far added a code-snippet so automatically insert the parameter into the input field.

This is my current code, working perfectly when using the submit-button or Enter.

e.g => website.com/?lookup=value

<form  method="post" name="formid" id="formid">
     <?php $paraid = $_GET['lookup']; ?>   
          <input class="form-control" id="steamid" name="s" value="<?php echo $paraid; ?>" > 
              <input type="submit" id="invbtn"  value="submit" />
      </form>

      <script>
        $('#formid').submit(function() {
          var id = $("#steamid").val().replace(/(?:https?\:)?\/\//i, '');
          $.ajax({
            type: "GET",
            data: "s="+id,
            url: 'steam.php',
            beforeSend:function() {
              $("#outputinfo").html("<center><img src='./assets/img/load.gif'></br></br>Wait...</center>");
            },success: function(html) {
              $("#outputinfo").html(html);
            }
          });
          return false;
        });
        $(document).ready(function() {
          var id = '<?php echo $_GET['s']; ?>';
          if (id != null) {
            $.ajax({
              type: "GET",
              data: "s="+id,
              url: 'steam.php',
              beforeSend:function() {
                $("#outputinfo").html("<center><img src='./assets/img/load.gif'></br></br>Wait...</center>");
              },success: function(html) {
                $("#outputinfo").html(html);
              }
            });
          }
          return false;
        });
      </script>

Thanks in advance.. i hope you guys can help me out..

To submit a form if it has a certain word in the url use:

<?php if(isset($_GET['lookup'}) == 'value') :?> //whatever website.com/?lookup=value is
<script>
$(document).ready(function(){
    $('#formid').submit();
});
</script>
<?php endif ?>