The undelegate() method is an inbuilt method in jQuery which is used to remove the specified event handler from the selected element.
Syntax:
$(selector).undelegate(selector, event, function)
Parameters: This method accepts three parameters as mentioned above and described below:
- selector: It is an optional parameter which is used to specify the selector from which event will remove.
- event: It is an optional parameter which is used to specify the name of the event type on the selector.
- function: It is an optional parameter which is used to specify the name of the handler function to remove.
Return Value: This method returns the selected element with specified changes made by undelegate() method.
Below examples illustrate the undelegate() method in jQuery:
Example 1: This example does not contain any parameters.
<!DOCTYPE html> <html> <head> <title>The undelegate Method</title> <script src= </script> <!-- jQuery code to show the working of this method --> <script> $(document).ready(function() { $("body").delegate("p", "click", function() { $(this).css("font-size", "25px"); }); $("button").click(function() { $("body").undelegate(); }); }); </script> <style> div { width: 300px; height: 100px; background-color: lightgreen; padding: 20px; font-weight: bold; font-size: 20px; border: 2px solid green; } button { margin-top: 10px; } </style> </head> <body> <div> <!-- click on this p element --> <p>Welcome to GeeksforGeeks!.</p> </div> <!-- click on this button to remove the event handler --> <button>Remove...!</button> </body> </html> |
Output:
Before click anywhere:
After click on the paragraph:
Note: First click on the button and then click on the paragraph, then no changes occur.
Example 2: This example contains all parameters.
<!DOCTYPE html> <html> <head> <title>The undelegate Method</title> <script src= </script> <!-- jQuery code to show the working of this method --> <script> $(document).ready(function() { $("body").delegate("div", "click", function() { $(this).animate({ height: "+=100px" }); $(this).animate({ width: "+=100px" }); }); $("button").click(function() { $("body").undelegate("div", "click"); }); }); </script> <style> div { width: 30px; height: 30px; background-color: green; } button { margin-top: 10px; } </style> </head> <body> <div></div> <!-- click on this button --> <button>Click here..!</button> </body> </html> |
Output:
Before clicking anywhere:
After clicking on the div element get resized.
Note: If click on the button and then click on the div element then no change in the size will take place.
