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Loading gif while waiting for AJAX response without any button trigger

When there is no trigger for loading gif we can use setTimeout dunction to display image


<img src="loading.GIF" id="img" style="display:none"/ >

<script>
           
            setTimeout(function(){$('#img').show();},30);
            $.ajax({
                 type: 'POST',
                 url:' ajaxfile.php',
                 data:{id:123},
                 success: function(response)
                 {   
                      $('#img').hide()
                     
                 },
                 error :function(response,status)
                 {
                  alert('Error');

                 } 
            });
</script>

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