on()
The function is used to bind one or more events for the specified element Event processing function .
In addition, you can also pass some additional required data to the event handling function.
Starting from jQuery 1.7, the on()
function provides all the functions required to bind event handlers and is used to uniformly replace the previous bind(), delegate(), live( ) and other event functions.
Even if it is a newly added element after executing the
on() function, as long as it meets the conditions, the bound event handling function will be valid for it.
In addition, this function can bind multiple event processing functions to the same element and the same event type. When an event is triggered, jQuery will execute the bound event processing functions in the order of binding.
To delete an event bound via on()
, use the off() function. If you want to attach an event, execute it only once, and then delete itself, use the one() function.
This function belongs to the jQuery
object (instance).
Syntax
jQuery 1.7 Add this function. It mainly has the following two forms of usage:
Usage one:
1 jQueryObject.on( events [, selector ] [, data ], handler )
Usage two:
1 jQueryObject.on( eventsMap [, selector ] [, data ] )
Parameters
Description | |
---|---|
events | String type One or more event types separated by spaces and an optional namespace, such as "click" , "focus click", "keydown.myPlugin". |
eventsMap | Object type An Object object, each of its properties corresponds to the event type And the optional namespace (parameter events), the attribute value corresponds to the bound event processing function (parameter handler).
|
selector | Optional/String type A jQuery selector used to specify which descendant elements can trigger binding determined event. If this parameter is null or is omitted, it means that the current element itself is bound to the event (the actual triggerer may also be a descendant element, as long as the event stream can reach the current element).
|
data | When an optional/any type of event is triggered, it needs to be passed to the event processing function through event.data any data. |
handler | Event handling function specified by Function type. |
The above is the detailed content of jQuery on() selector function. For more information, please follow other related articles on the PHP Chinese website!

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