jQuery focus() Method
Example
Attach a function to the focus event. The focus event occurs when the <input> field gets focus:
  
    $("input").focus(function(){
    $("span").css("display", "inline").fadeOut(2000);
 });
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Definition and Usage
The focus event occurs when an element gets focus (when selected by a mouse click or by "tab-navigating" to it).
The focus() method triggers the focus event, or attaches a function to run when a focus event occurs.
Tip: This method is often used together with the blur() method.
Syntax
Trigger the focus event for selected elements:
  
    $(selector).focus()
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Attach a function to the focus event:
  
    $(selector).focus(function)
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| Parameter | Description | 
|---|---|
| function | Optional. Specifies the function to run when the focus event occurs | 

