Comments on: Events Explained

By: Siddharth

Siddharth — Mon, 02 Jan 2012 07:52:28 +0000

When we are throwing a user defined event we are throwing it for only one component. If we want many components to listen the event, then we have to fire events for each components. Something like this.

component1.fireEvent(’assigned’, this, employee, position);
component2.fireEvent(’assigned’, this, employee, position);
component3.fireEvent(’assigned’, this, employee, position);

This is similar to call any normal function. It looks like custom events are not solving any technical challenge but they are providing a better design approach.

By: Radha Krishna

Radha Krishna — Tue, 27 Dec 2011 17:29:40 +0000

If you have multiple components in your application like grid panel,form etc. when you select something in grid . you will throw an user defined event. you have listeners in panel and from that will update their status according to the event. ‘Event’ is like broadcasting, listeners are like the people who are interested in event. It is like television broadcasting . there can be many channels available to you but you are interested in channel ‘abc’ and someone might be interested in ‘TNT’ etc.

By: Siddharth

Siddharth — Tue, 27 Dec 2011 12:52:19 +0000

I did not get it. Can you give an example.

By: Radha Krishna

Radha Krishna — Mon, 26 Dec 2011 18:39:31 +0000

I think events are used when there are multiple listeners, and when you have multiple asynchronous calls.

By: Siddharth

Siddharth — Thu, 22 Dec 2011 14:00:16 +0000

Hi Saki,

Thanks for this article. It is really helpful. However, I have one query. From example given here it looks like we are firing event manually using “this.fireEvent(’assigned’, this, employee, position);”. If we are firing event manually then why can’t we simply call a normal function here. Please correct me if I am missing anything.

Thanks,
Siddharth Jain

By: Jan

Jan — Wed, 23 Nov 2011 13:02:35 +0000

Thanks a million.

By: neo

neo — Sat, 30 Jul 2011 03:56:12 +0000

Thanks
one question please:
when we fire event “dismissed” for example that will call the “dismissed” function which also fire the even again! that will lead to execute code inside “dismissed” function forever ?

By: Irina

Irina — Wed, 08 Dec 2010 02:09:43 +0000

This is extremely helpful, thank you.

By: Saki

Saki — Mon, 16 Aug 2010 01:12:09 +0000

@all, sorry I won’t answer here questions of “How do I …” nature. There is fantasic forum for this at ext home page. http://www.sencha.com/forum

By: Saki

Saki — Mon, 16 Aug 2010 01:09:47 +0000

No, no. I’ve been around FORTRAN in 80-ties.