jQuery BlockUI Plugin lets you simulate synchronous behavior when using AJAX, without locking the browser.
https://jquery.malsup.com/block/
JavaScript Libraries and Functions
Get access to data on 12,694,809 websites that are jQuery BlockUI Customers. We know of 5,328,049 live websites using jQuery BlockUI and an additional 7,366,760 sites that used jQuery BlockUI historically and 2,309,471 websites in the United States.
Get a list of 12,694,809 websites using jQuery BlockUI which includes location information, hosting data, contact details, 5,328,049 currently live websites and an additional 2,613,950 domains that redirect to sites in this list. 7,366,760 sites that used this technology previously and 2,309,471 websites in the United States currently using jQuery BlockUI.
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