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From "Alvarado, Juan (c)" <>
Subject RE: LookupDispatchAction onchange
Date Tue, 10 Dec 2002 16:05:16 GMT
The LookupDispatchAction was designed with the intention of not having to
use javascript to work with multiple submit buttons in one form. 

Since what you need is a submit from an onChange event in a text field which
is a somewhat not often seen operation (at least from my experiences), you
have no choice but to do the javascript in this case.

Just our of curiosity, what requirement in your application do you have that
needs the form to be submitted when a text field changes???

-----Original Message-----
From: Cook, Graham []
Sent: Tuesday, December 10, 2002 10:50 AM
To: 'Struts Users Mailing List'
Subject: RE: LookupDispatchAction onchange

Thanks Andrew & Juan, thats very helpful. 

Its is a shame that I have to use JavaScript to achieve a submit from a text
field. The other buttons on the screen use the <html:submit> tag, 

<html:submit property="doaction">
	<bean:message key="button.savedetails"/>

obviously theres no Javascript there, shame there isnt some way of doing
this with a tag rather than having javascript code to do the submit.

Thanks you for your help.

-----Original Message-----
From: Alvarado, Juan (c) []
Sent: 10 December 2002 15:25
To: 'Struts Users Mailing List'
Subject: RE: LookupDispatchAction onchange

If I remember correctly the LookupDispatchAction does a reverse lookup on
your resource bundle in order to determine which method to call in the


if you have a key in your called:

textfield.changed=submit form

then you would obviously need something like the following in the

map.put("textfield.changed", "textFieldChangedMethod");

So when your text field changes, you will need to submit the parameter you
configured for your LookupDispatchAction in struts-config.xml with the a
value of 'submit form'

What the action should do is do a reverse lookup on the ApplicationResources
file and look for a value of 'submit form'. 'submit form' is associated with
the key textfield.changed and it will cause the textFieldChangedMethod to be
called in your class.

Also, make sure you follow Andrew's suggestion about not using 'action' as
the parameter name. This has the potential to cause your form to behave in a
very weird manner. It caused me lots of headaches in the past until I
figured out it was the parameter name I used was 'action'.

If you need any more help on this let me know.

Take care

-----Original Message-----
From: Andrew Hill []
Sent: Tuesday, December 10, 2002 9:54 AM
To: Struts Users Mailing List
Subject: RE: LookupDispatchAction onchange

Should be possible.
You may need to do something like appending a parameter to your forms action
url with a bit of javascript to simulate whats submitted by a button. Can't
remember the details for LookupDispatchAction since I havent used it, but
heres some js that will play with your forms action and append a parameter
named 'method' with value defined by useMethod.
Adapt as required. (nb: its modified from a similar script (which works with
DispatchAction rather than LookupDispatchAction) of mine for the purposes of
this reply and thus untested!)

function submitBlah(useMethod)
    document.forms[0].action =

function appendParameter(url, parameter, value)
  var delimeter = url.indexOf('?') == -1 ? '?' : '&';
  return url + delimeter + parameter + '=' + value;

Having said all that I should point out that you might be able achieve a
similar effect using an appropriate hidden field too. Much simpler (though
doesnt work too well with multipart forms submitting to a DispatchAction).
If you try that be careful you dont submit 2 values for your property when a
button is clicked.

btw: Just looking at the javadocs for LDA. I see they use 'action' as the
name of their example parameter. Bad idea naming anything on a form
'action'. It will shadow the form.action property (which means above script
wont work for one thing). Same reason that naming a button 'submit' will
lead you into trouble when you later try to add a call to javascripts
form.submit() method...

-----Original Message-----
From: Cook, Graham []
Sent: Tuesday, December 10, 2002 22:27
To: ''
Subject: LookupDispatchAction onchange

Is it possible to use an onchange event on a text input field to submit the
form to a LookupDispatchAction?

I have numerous buttons on the JSP page which submit the form to my
LookupDispatchAction, and work depending on what the value of the action is,
but i would like to also call my LookupDispatchAction from an onchange event
of a text field?

Anyone done this?

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