Js method to trigger the onchange event

The onchange event in js is an event that starts when the client changes the value of the input control, such as a textbox. However, if you change the value of a textbox in your js code instead of changing the value of a textbox through keyboard input, the onchange event will not start.

Then, how to trigger the onchange event of textbox control through the code in js code mode? After looking up the materials, I found that js provides a method that can trigger the control should be all events. The object.fireevent () method, which fires the onchange event of the control using a method such as object.fireevent ('onchange').

Similarly, using the fireEvent method in js can also trigger other spatial events.