How can i handle events in perl

Dasari

Hi,

I want to know more details about eventhandling in perl. I would like to use this in workflow.

Thanks.

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Ambuj

Hi,

I want to know more details about eventhandling in perl. I would like to use this in workflow.

Thanks.

Can you please elaborate your requirement as what exactly you want to achieve?

Dasari

I have the following scenario.

I have one drop down list where I can select an item from that. Now, onChange of the item in that dropdown, another listbox should be displayed dynamically depending on the selected item from the dropdown. We can do this by using "onChange" in javascript. Can we do this in perl in anyway?

kaalraa

I have the following scenario.

I have one drop down list where I can select an item from that. Now, onChange of the item in that dropdown, another listbox should be displayed dynamically depending on the selected item from the dropdown. We can do this by using "onChange" in javascript. Can we do this in perl in anyway?

I think you are trying to grow oranges on the apple trees. When the change of list box is done on client side; how come an event be called on server.

You need to pass the event from client to server; which enable you to do some action over there.

Adam Stoller

I have the following scenario.

I have one drop down list where I can select an item from that. Now, onChange of the item in that dropdown, another listbox should be displayed dynamically depending on the selected item from the dropdown. We can do this by using "onChange" in javascript. Can we do this in perl in anyway?

Perhaps - but it would likely be an up-hill battle if you're trying to do it without javascript.

You could take a look at various Apache::*, CGI::*, LWP::* modules for example - but eventually it comes down to initiating the event handler from the client-side and since you cannot depend on the client-side having Perl and the specific modules you want - you generally have to assume that you're using javascript there.

On the server side it's a lot easier to write the code in Perl - that's what a lot of CGI programs use - you have more control over what's available on the server side.

So - basically you end up with javascript on the client side that traps the event and then can signal / call a program on the server side written in a different language (e.g.: Perl) that processes the event and then returns HTML and/or Javascript code back through STDOUT.

For the specific case you're asking about - I think javascript with either Ajax or CGI::Ajax code is the way to go ... though I must admit I haven't had much experience with Ajax thus far, it sounds like a pretty neat and useful technology.