Is it possible to define a function to be called when a MenuItem is selected? - Lift

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Message from discussion Is it possible to define a function to be called when a MenuItem is selected?
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Date: Wed, 23 May 2012 11:40:10 +1000
Message-ID: <CAFUZPrWrXkmCUSHuLsJL__rkmVwQCfbQgznnV_2aHA6ohd=...@mail.gmail.com>
Subject: Re: [Lift] Is it possible to define a function to be called when a
 MenuItem is selected?
From: Jonathan Ferguson <j...@spiralarm.com>
To: liftweb@googlegroups.com
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Hi David,

Sorry for the delay, I got caught up with another project.

I think this could be a viable solution. Do you know where there is
anything documentation on type safe Loc and LocParam other than the scala
docs?

I'll have a look at the scala doc and see if I can get an example working.

Thank you

Jono

On 16 May 2012 08:39, David Whittaker <d...@iradix.com> wrote:

> Jono,
>
> Could you not accomplish that through a type safe Loc that calculates a
> value?  Maybe this doesn't fit your particular use case but I'm thinking
> that a Loc[State] where the the State is calculated via a CalcValue
> LocParam would make the State available to the snippets when the Loc is
> matched.  You can then define your snippets as:
>
> class MySnippet(val state: State) extends DispatchSnippet {
> ..... some transforms that use your state .....
> }
>
> On Tue, May 15, 2012 at 6:18 PM, Jonathan Ferguson <j...@spiralarm.com>wrote:
>
>> Hi David,
>>
>> The code needs to run when the menu item is clicked. So the new state is
>> available to the snippets when the page is being built.
>>
>> Jono
>>
>>
>> On Wednesday, 16 May 2012 01:42:58 UTC+10, David Whittaker wrote:
>>>
>>> Hi Jono,
>>>
>>> What type of state are we talking about?  Does your code need to run
>>> when the menu item is clicked, or can it be invoked when the page the menu
>>> item points to is displayed?
>>>
>>> On Tue, May 15, 2012 at 3:00 AM, Jonathan Ferguson <j...@spiralarm.com>wrote:
>>>
>>>> Hello all,
>>>>    I have a custom Loc in which I override **supplimentalKidMenuItems
>>>> to build a sub menu based on a database table.  Ideally when a MenuItem
>>>> from the sub menu is clicked a function would be run allowing me to change
>>>> state.  Currently I'm stuck and am thinking about using a RestHelper to
>>>> trigger the state change, which seems ugly.
>>>>
>>>>    override def supplimentalKidMenuItems =  CurrentUser.is match{
>>>>
>>>>       case Full(u) =>
>>>>
>>>>         val ts = u.things
>>>>
>>>>         ts.size match {
>>>>
>>>>           case 1 => Nil
>>>>
>>>>           case otherwise =>
>>>>
>>>>             val x = for { t <- ts}  yield {MenuItem(Text(t.name.is),
>>>> Text("switch/%s".format(t.id))**, Nil, false, false,Nil)}
>>>>
>>>>             x.toList ::: super.**supplimentalKidMenuItems
>>>>
>>>>         }
>>>>
>>>>       case otherwise => Nil
>>>>
>>>>       }
>>>> Any pointers would be appreciated.
>>>>
>>>>
>>>> Thank you
>>>> Jono
>>>>
>>>> --
>>>> Lift, the simply functional web framework: http://liftweb.net
>>>> Code: http://github.com/lift
>>>> Discussion: http://groups.google.com/**group/liftweb<http://groups.google.com/group/liftweb>
>>>> Stuck? Help us help you: https://www.assembla.com/wiki/**
>>>> show/liftweb/Posting_example_**code<https://www.assembla.com/wiki/show/liftweb/Posting_example_code>
>>>>
>>>
>>>  --
>> Lift, the simply functional web framework: http://liftweb.net
>> Code: http://github.com/lift
>> Discussion: http://groups.google.com/group/liftweb
>> Stuck? Help us help you:
>> https://www.assembla.com/wiki/show/liftweb/Posting_example_code
>>
>
>  --
> Lift, the simply functional web framework: http://liftweb.net
> Code: http://github.com/lift
> Discussion: http://groups.google.com/group/liftweb
> Stuck? Help us help you:
> https://www.assembla.com/wiki/show/liftweb/Posting_example_code
>

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Hi David,=C2=A0<div><br></div><div>Sorry for the delay, I got caught up wit=
h another project.=C2=A0</div><div><br></div><div>I think this could be a v=
iable solution. Do you know where there is anything documentation on type s=
afe Loc and LocParam other than the scala docs?</div>
<div><br></div><div>I&#39;ll have a look at the scala doc and see if I can =
get an example working.=C2=A0</div><div><br></div><div>Thank you=C2=A0</div=
><div><br></div><div>Jono<br><br><div class=3D"gmail_quote">On 16 May 2012 =
08:39, David Whittaker <span dir=3D"ltr">&lt;<a href=3D"mailto:dave@iradix.=
com" target=3D"_blank">d...@iradix.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Jono,<div><br></div><div>Could you not accom=
plish that through a type safe Loc that calculates a value? =C2=A0Maybe thi=
s doesn&#39;t fit your particular use case but I&#39;m thinking that a Loc[=
State] where the the State is calculated via a CalcValue LocParam would mak=
e the State available to the snippets when the Loc is matched. =C2=A0You ca=
n then define your snippets as:</div>


<div><br></div><div>class MySnippet(val state: State) extends DispatchSnipp=
et {</div><div>..... some transforms that use your state .....</div><div cl=
ass=3D"HOEnZb"><div class=3D"h5"><div>}</div><div><br><div class=3D"gmail_q=
uote">
On Tue, May 15, 2012 at 6:18 PM, Jonathan Ferguson <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:j...@spiralarm.com" target=3D"_blank">j...@spiralarm.com</a=
>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi David,=C2=A0<div>=C2=A0=C2=A0</div><div>T=
he code needs to run when the menu item is clicked. So the new state is ava=
ilable to the snippets when the page is being built.=C2=A0</div>


<div><br></div><div>Jono<div><div><br><br>On Wednesday, 16 May 2012 01:42:5=
8 UTC+10, David Whittaker  wrote:<blockquote class=3D"gmail_quote" style=3D=
"margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex">

Hi Jono,<div><br></div><div>What type of state are we talking about? =C2=A0=
Does your code need to run when the menu item is clicked, or can it be invo=
ked when the page the menu item points to is displayed?<br><div><br><div cl=
ass=3D"gmail_quote">




On Tue, May 15, 2012 at 3:00 AM, Jonathan Ferguson <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:j...@spiralarm.com" target=3D"_blank">j...@spiralarm.com</a=
>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




Hello all,=C2=A0<div>=C2=A0 =C2=A0I have a custom Loc in which I override=
=C2=A0<u></u>supplimentalKidMenuItems to build a sub menu based on a databa=
se table. =C2=A0Ideally when a MenuItem from the sub menu is clicked a func=
tion would be run allowing me to change state. =C2=A0Currently I&#39;m stuc=
k and am thinking about using a RestHelper to trigger the state change, whi=
ch seems ugly.</div>




<div><br></div><div>







<p>=C2=A0 =C2=A0<span>override</span> <span>def</span> supplimentalKidMenuI=
tems =3D=C2=A0 CurrentUser.is <span>match</span>{</p>
<p>=C2=A0 =C2=A0 =C2=A0 <span>case</span> Full(<span>u</span>) =3D&gt;</p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 <span>val</span> <span>ts</span> =3D <span>u=
</span>.things</p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0<span>ts</span>.size <span>match</span>=
 {<br></p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <span>case</span> 1 =3D&gt; Nil =C2=
=A0</p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <span>case</span> <span>otherwise</sp=
an> =3D&gt;</p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <span>val</span> <span>x</span=
> =3D <span>for</span> { <span>t</span> &lt;- <span>ts</span>}=C2=A0 <span>=
yield</span> {MenuItem(Text(<span>t</span>.<span>name</span>.is), Text(<spa=
n>&quot;switch/%s&quot;</span>.format(<span>t</span>.id))<u></u>, Nil, <spa=
n>false</span>, <span>false</span>,Nil)}</p>





<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <span>x</span>.toList ::: <spa=
n>super</span>.<u></u>supplimentalKidMenuItems=C2=A0</p>
<p>=C2=A0 =C2=A0 =C2=A0 =C2=A0 }</p>
<p>=C2=A0 =C2=A0 =C2=A0 <span>case</span> <span>otherwise</span> =3D&gt;=C2=
=A0Nil</p>
<p>=C2=A0 =C2=A0 =C2=A0 }</p></div><div>Any pointers would be appreciated.<=
/div><div><br></div><div><br></div><div>Thank you=C2=A0</div><div>Jono</div=
><span><font color=3D"#888888">







<p></p>

-- <br>
Lift, the simply functional web framework: <a href=3D"http://liftweb.net" t=
arget=3D"_blank">http://liftweb.net</a><br>
Code: <a href=3D"http://github.com/lift" target=3D"_blank">http://github.co=
m/lift</a><br>
Discussion: <a href=3D"http://groups.google.com/group/liftweb" target=3D"_b=
lank">http://groups.google.com/<u></u>group/liftweb</a><br>
Stuck? Help us help you: <a href=3D"https://www.assembla.com/wiki/show/lift=
web/Posting_example_code" target=3D"_blank">https://www.assembla.com/wiki/<=
u></u>show/liftweb/Posting_example_<u></u>code</a><br>
</font></span></blockquote></div><br></div></div>
</blockquote></div></div></div><div><div>

<p></p>

-- <br>
Lift, the simply functional web framework: <a href=3D"http://liftweb.net" t=
arget=3D"_blank">http://liftweb.net</a><br>
Code: <a href=3D"http://github.com/lift" target=3D"_blank">http://github.co=
m/lift</a><br>
Discussion: <a href=3D"http://groups.google.com/group/liftweb" target=3D"_b=
lank">http://groups.google.com/group/liftweb</a><br>
Stuck? Help us help you: <a href=3D"https://www.assembla.com/wiki/show/lift=
web/Posting_example_code" target=3D"_blank">https://www.assembla.com/wiki/s=
how/liftweb/Posting_example_code</a><br>
</div></div></blockquote></div><br></div>

<p></p>

-- <br>
Lift, the simply functional web framework: <a href=3D"http://liftweb.net" t=
arget=3D"_blank">http://liftweb.net</a><br>
Code: <a href=3D"http://github.com/lift" target=3D"_blank">http://github.co=
m/lift</a><br>
Discussion: <a href=3D"http://groups.google.com/group/liftweb" target=3D"_b=
lank">http://groups.google.com/group/liftweb</a><br>
Stuck? Help us help you: <a href=3D"https://www.assembla.com/wiki/show/lift=
web/Posting_example_code" target=3D"_blank">https://www.assembla.com/wiki/s=
how/liftweb/Posting_example_code</a><br>
</div></div></blockquote></div><br></div>

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