javascript - jQuery Ajax Options - I need advice -


when working on jquery ajax, think it's option "async", know meaning (asynchronous javascript , xml), need ajax before statement complete, example form validations, when check in db, if username exists, add in ajax option "async: false". bad way this? need youd advice :)

my code:

var content = $("#content");  function ajaxresponse() {     var r = null;     $.ajax({         type: 'post',         url: 'data.html',         async: false,         success: function(data) {             r = data;         }     });     return r; }  setinterval(function(){      content.text(ajaxresponse()); },1000);

here how code except not post html page load html page instead

var content = $("#content"), tid;  function ajaxresponse() {     $.ajax({         type: 'post',         url: 'data.php',         success: function(data) {             content.text(data);             tid = settimeout(ajaxresponse,1000); // run again         }     }); }

to update content html page:

content.load("somepage.html");

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