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If the eventType string contains a period. The period character separates the event from its namespace. For example, in the call.
Namespacing allows us to unbind or trigger some events of a type without affecting others. See the discussion of. There are shorthand methods for some standard browser events such as. For a complete list of shorthand methods, see the events category. When an event reaches an element, all handlers bound to that event type for the element are fired. If there are multiple handlers registered, they will always execute in the order in which they were bound.
After all handlers have executed, the event continues along the normal event propagation path. This code will cause the element with an ID of foo to respond to the click event. When a user clicks inside this element thereafter, the alert will be shown. As of jQuery 1. The handler parameter takes a callback function, as shown above. Within the handler, the keyword this refers to the DOM element to which the handler is bound.
After this code is executed, when the user clicks inside the element with an ID of foo , its text contents will be shown as an alert. This is useful when the event data feature is being used, or when other unique data resides in a closure around the event handler function. This will bind an event handler equivalent to: This function can be removed at a later time by calling: The handler callback function can also take parameters.
When the function is called, the event object will be passed to the first parameter. The event object is often unnecessary and the parameter omitted, as sufficient context is usually available when the handler is bound to know exactly what needs to be done when the handler is triggered.
However, at times it becomes necessary to gather more information about the user's environment at the time the event was initiated. View the full Event Object. Returning false from a handler is equivalent to calling both. Note the parameter added to the anonymous function. This code will cause a click on the element with ID foo to report the page coordinates of the mouse cursor at the time of the click. The optional eventData parameter is not commonly used. When provided, this argument allows us to pass additional information to the handler.
One handy use of this parameter is to work around issues caused by closures. For example, suppose we have two event handlers that both refer to the same external variable:. Because the handlers are closures that both have message in their environment, both will display the message Not in the face!
The variable's value has changed. To sidestep this, we can pass the message in using eventData:. This time the variable is not referred to directly within the handlers; instead, the variable is passed in by value through eventData , which fixes the value at the time the event is bound. The first handler will now display Spoon!
Note that objects are passed to functions by reference , which further complicates this scenario. If eventData is present, it is the second argument to the. Although demonstrated in the next example, it is inadvisable to bind handlers to both the click and dblclick events for the same element. The sequence of events triggered varies from browser to browser, with some receiving two click events before the dblclick and others only one. Double-click sensitivity maximum time between clicks that is detected as a double click can vary by operating system and browser, and is often user-configurable.
Handle click and double-click for the paragraph. Stop an event from bubbling without preventing the default action by using the. Attach a handler to an event for the elements. A string containing one or more DOM event types, such as "click" or "submit," or custom event names. Setting the third argument to false will attach a function that prevents the default action from occurring and stops the event from bubbling.
The default is true. A basic usage of. To display each paragraph's text in an alert box whenever it is clicked: You can pass some extra data before the event handler: Cancel a default action and prevent it from bubbling up by returning false: Cancel only the default action by using the. Bind multiple events simultaneously.