jQuery one() Method (original) (raw)

Last Updated : 11 Jul, 2025

The **jQuery one() method is an inbuilt method that attaches one or more event handlers for the selected element. This also attaches a function to run when the event occurs. This method is named one because whatever event handler attaches to this method will run only once.

**Syntax:

$(selector).one(event, data, function)

**Parameter:

This method accepts three parameters as mentioned above and described below:

• **event: It is a required parameter. It is used to specify one or more events to attach to the elements. If multiple events given then use space to separate them.
• **data: It is an optional parameter. It is used to specify additional data to pass along to the function.
• **function: It is a required parameter. It is used to specify the function to run when the event occurs.

**Return Value:

This method returns the selected element with the specified event handler.

**Example 1: This example illustrates the use of one() method.

HTML `