Form not submitting inside $.ajax success function

Question

I\'m validating for duplicate names by using jquery+Ajax. Everything is working fine except that the form is not submitting once everything returns true

What

Answer 1

$('#form1').submit(function(){

    var name = $('#shelf_name').val();

    if(name == '')
    {
        alert('Shelf name is required');
        $('#shelf_name').focus();
    }
    else
    {                   
        var istrue = false;        
        $.ajax({
            type:'post',
            url:'check-duplicate-shelf-name.php',
            data:{'name':name},
            context:this,
            success:function(data)
            {
                if(data == 'stop')
                {
                    alert('Shelf name already exists');
                    istrue = false;
                }
                else
                {   
                    alert('else working?') // alert box is showing up                           
                    istrue = true;
                }
            }
        });
        return istrue;
    }
});

some thing like this :) cant test