php - ajax request gets blocked until the server return the response -


i sending ajax request html page using jquery send bulk emails , fetch data server.

here code send request bulk mail

var sendreq =   $.ajax({                 type: 'post',                 data: "leftid="+json.stringify(leftid)+"&rightid="+json.stringify(rightid)+"&mode="+mode,                 datatype: 'json',                 url:"bulk.php"           });          sendreq.done(function( data ) {                       $("#bms-ack").html(data.status);                     $("#bms-ack").fadein('slow');                     $("#bms-ack").fadeout(6000);                      console.log(data);                     console.log("success");          });          sendreq.fail(function(jqxhr, data){                       $("#bms-ack").html(data.status);                     $("#bms-ack").fadein('slow');                     $("#bms-ack").fadeout(6000);                       console.log("fail");           });

now issue when send request php page send mails , respond success message.

as php returning response client ajax request going blocked ? because when send request jqtable fetch new data takes time until previous request of ajax send bulk mail hans't finished. , jqtable keeps loading.

how rid of blocking request , should remove returning success message php , if how user know request has been submitted ?

if understand correctly issue can't fire javascript call while first 1 running? that's because javascript single-threaded in browser implementations.

some light reading:is javascript guaranteed single-threaded?


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