How to change bootstrap 3 menu button on click on mobile version?

Question

css

The site has a standard Bootstrap 3 menu. clip2net.com/s/3N5EpJs It is necessary that when you click on the menu button, the menu opens, and the menu button changes to a Cross. clip2net.com/s/3N5EyBS When the menu was closed, the button became back to standard. I don't know how to change the button to a cross. Tell me please

Answer 1

This is done via jquery. Read up on toggleClass in jquery. Adds a class, for example, close_menu to this element, for close_menu you prescribe this background with a cross and when you click the class will be removed and there will be a standard picture.