Jquery synchronously calls Ajax

Source: Internet
Author: User

Because Ajax calls in jquery are asynchronous by default, problems may occur when synchronous execution is required. For example, if I have a form, I want to verify a text box before submitting it (to submit it to the server for database connection verification), the server will not return the verification result when submitting it, the form has been submitted.


1. Set async: false directly in $. Ajax ().

$. Ajax ({
Type: "Post", // HTTP Request Method
URL: "xmlserver", // URL of the server segment
Data: "username =" + username, // data sent to the server segment
Datatype: "html", // inform jquery of the returned data format
Success: callback, // callback function called when the interaction is complete and the server correctly returns data
Async: false

2. Use $. ajaxsetup ({async: false });

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