jquery Understanding Event Delegation

The delegate() method attaches one or more event handlers for specified elements that are children of selected elements, and specifies a function to run when the events occur.
Event handlers attached using the delegate() method will work for both current and FUTURE elements (like a new element created by a script).

As of jQuery version 1.7, the on() method is the preferred method for attaching event handlers for selected elements.

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When a <p> element inside a <div> element is clicked, change the background color of all <p> elements:

$("div").delegate("p","click",function(){
  $("p").css("background-color","pink");
});

Try it yourself »

Syntax

$(selector).delegate(childSelector,event,data,function)

Parameter	Description
childSelector	Required. Specifies one or more child elements to attach the event handler to
event	Required. Specifies one or more events to attach to the elements. Multiple event values are separated by space. Must be a valid event
data	Optional. Specifies additional data to pass along to the function
function	Required. Specifies the function to run when the event occurs

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mysql query Sorting certain values to the top

Hay guys you can see the query as same result but execution speed

--------------------------------------------------- 

(

 SELECT  * 
FROM cyb_jm_master_countries_m
WHERE country_name =  "United States"
)
UNION (

SELECT  * 
FROM cyb_jm_master_countries_m
WHERE country_name !=  "United States"
)

---------------------------------------------------- 

OR

SELECT  * 
FROM cyb_jm_master_countries_m
ORDER  BY  `country_name`  =  'United States' DESC ,  `country_name`  ASC 
LIMIT 0 , 30