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Posted to users@tapestry.apache.org by Peter Dawn <pe...@gmail.com> on 2006/09/07 06:17:30 UTC

Obtaining check box data from a form

guys,

i am trying to implement a big form within my web app. in the form the
user is able to select through checkboxes what information they want
viewed. now each checkbox has a corresponding value associated with
it.

now when the user clicks on the submit button, i want to pass on the
values of all checked checkboxes to my java code (the value of
unchecked boxes should not be passed).

I have been working on it all morning now. can somebody help me out
with this. i am using tap3.

thanks.

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Re: Re: Obtaining check box data from a form

Posted by Sam Gendler <sg...@ideasculptor.com>.

The Tapestry Checkbox component doesn't offer a way to do what you
want but it is possible to do it.  If you have multiple input fields
with the same name, the servlet spec says that you can call
request.getParameters("fieldName") and receive an array of strings.

So here's how I solved this:

Write some code that renders a plain <input type="checkbox"
name="myName" value="someValue"/> rather than using Tapestry Checkbox
component.  If you want to make it a component, one very similar to
existing Checkbox, then so much the better.

Now make another component called CheckboxGroup.  Include a listener
method which will get executed whenever the CheckboxGroup is rewound.
Your custom Checkbox component can check if the current Container is a
CheckboxGroup.  if it is, get the name from the CheckboxGroup.  Then,
in your Group listener, call getWebRequest().getParameters("myName")
to retrieve a String[] of values. Now, if necessary, convert the
string to an actual object.  Then assign the array to the appropriate
place. html would look something like this:

<span jwcid="@lib:CheckboxGroup" name="literal:someObject.someEntitySet" >
  <span jwcid="@lib:CustomCheckbox" value="ognl:someValue"/>
  <span jwcid="@lib:CustomCheckbox" value="ognl:someOtherValue"/>
</span>

Although in our case, we skipped the CustomCheckbox component
entirely.  We just pass a SelectionModel to the CheckboxGroup, and use
the label and value properties to render a checkbox from the render
method of the CheckboxGroup.  We can fetch the values during the
rewind method of the same component.  And some simple ognl
manipulations on the name parameter can allow you to assign the
resulting values to the named object/property.

Of course, I have no idea if any of this will work in Tap3, but in my
case, it was only a couple of hours in Tap4, mostly spent figuring out
what changes I needed to make to the contrib:MultiplePropertySelection
and contrib:CheckBoxMultiplePropertySelectionRenderer.  The code was
easy enough to understand and modify to my own needs.

--sam

On 9/6/06, Peter Dawn <pe...@gmail.com> wrote:
> ok. the only other way for me to obtain a users selection would a
> radio button. might try that.
>
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RE: Obtaining check box data from a form

Posted by Mark Stang <ms...@pingidentity.com>.

The example in the Component Reference doesn't provide the simplest example...


Name: Mark J. Stang
Title: Senior Engineer/Architect
office: +1 303.468.2900
mobile: +1 303.507.2833
Ping Identity



-----Original Message-----
From: Peter Dawn [mailto:petedawn@gmail.com]
Sent: Thu 9/7/2006 4:38 PM
To: Tapestry users
Subject: Re: Obtaining check box data from a form
 
Mark, so as per your example, if i am understanding it corrently, i
can only retrieve the boolean value and not the corresponding string
associated with the checkbox.

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