jQuery延迟对象回调不触发

Question

I have the following code

function get_hash(){
    id = $('#file_id').val()
    deferred =  $.ajax({ url: "/rest/hash_upload/", type: "GET", data: {file_id: id} })
    $.when(deferred).then(function(data){
        alert('executing')
        $('#input_md5_checksum').val(data)
    })
}

The ajax gets called and my backend returns the hash as expected. However, the deferred callback method does not fire. Can anyone see what I'm doing wrong?

Thanks.

Answer 1

Why set your query as a variable and and then use when() , why not just use a regular ajax call?

        $.ajax({ 
            url: "/rest/hash_upload/", 
            type: "GET", 
            data: {file_id: id} 
        }).done(function(data){
            alert('executing');
            $('#input_md5_checksum').val(data);
        }).fail(function(xhr, status, error){
            return ("Ajax failed: " + xhr.responseText);
        });