currently I have started to reimplement my existing blog (it is a JSF app : www.chr-thomas.de) with Lift to learn it (I can simply use my existing services via jndi lookup do get the appropriate content for the page).
I want to create a side bar, which should show a listing of all existing main-categories including its sub-categories (if you visit my page, you can see it on the right side under the header "Kategorien"). The visitor can click such a sub-category to the filter the result of article-previews on that page.
class Categories { def mainCategories(html: NodeSeq) : NodeSeq = { val resource = new BlogResource // know's how to access the java services val mainCategories = resource.getAllMainCategories return mainCategories.flatMap(category => bind("row", html, "name" -> {category.getName + " : " + category.getId}))
}
def subCategories(html: NodeSeq) : NodeSeq = { val resource = new BlogResource // know's how to access the java services val parentId : Long = 1 // for the first test a static id is set val subCategories = resource.getAllChildCategories(parentId) return subCategories.flatMap(category => bind("subrow", html, FuncAttrBindParam("link", {ns : NodeSeq => Text("/blog/category/" + category.getName.toLowerCase)}, "href"), "name" -> {category.getName}, "count" -> {resource.getNoOfArticlesForCategory(category.getId)}))
I have to pass the id of each main-category to the snippet, which generates the entries for the sub-categories ( currently a static known parentId val parentId : Long = 1 //in method subCategories is set to see, I the rest of the code works ) ?
You might need to put the source code into a new sbt skeleton project, but it still works with the latest Lift libs. There is an example David did with a list of forums and a list of threads per forum.
> I have to pass the id of each main-category to the snippet, which generates the entries for the sub-categories ( currently a static known parentId
> val parentId : Long = 1 //in method subCategories
> is set to see, I the rest of the code works ) ?
Also, please use the CSS Selector Transforms rather than the bind()
syntax... the CSS Selector Transforms lead to more readable
and understandable code.
On Sun, Nov 18, 2012 at 2:19 AM, AGYNAMIX Torsten Uhlmann <
> You might need to put the source code into a new sbt skeleton project, but
> it still works with the latest Lift libs. There is an example David did
> with a list of forums and a list of threads per forum.
> Am 18.11.2012 um 11:00 schrieb Christian Thomas <chris...@googlemail.com>:
> oops, I have accidentally post it...
> Okay, here my question:
> How can I solve it in Lift:
> I have to pass the id of each main-category to the snippet, which
> generates the entries for the sub-categories ( currently a static known
> parentId
> val parentId : Long = 1 //in method subCategories
> is set to see, I the rest of the code works ) ?
> Also, please use the CSS Selector Transforms rather than the bind() > syntax... the CSS Selector Transforms lead to more readable > and understandable code.
> On Sun, Nov 18, 2012 at 2:19 AM, AGYNAMIX Torsten Uhlmann < > T.Uh...@agynamix.de <javascript:>> wrote:
>> Hi Christian,
>> so you basically want to support a URL like "/blog/<xyz>/list" where xyz >> is a category or ID or whatever narrows down the elements to show?
>> You might need to put the source code into a new sbt skeleton project, >> but it still works with the latest Lift libs. There is an example David did >> with a list of forums and a list of threads per forum.
>> Am 18.11.2012 um 11:00 schrieb Christian Thomas <chri...@googlemail.com<javascript:> >> >:
>> oops, I have accidentally post it...
>> Okay, here my question:
>> How can I solve it in Lift:
>> I have to pass the id of each main-category to the snippet, which >> generates the entries for the sub-categories ( currently a static known >> parentId >> val parentId : Long = 1 //in method subCategories >> is set to see, I the rest of the code works ) ?
Please take a look at the project that Torsten pointed you to.
Specifically, the ForumStuff.scala file which contains the logic to create
a menu link based on a parameter:
class AForum(f: Forum) {
def render = "li *" #>
ForumThread.all(f).map(t =>
"a *+" #> t.name & "a [href]" #> AThread.menu.calcHref(f -> t))
}
On Sun, Nov 18, 2012 at 10:46 AM, Christian Thomas
<chris...@googlemail.com>wrote:
> Now I have to check, how to use the Menu.param to append the dynamic
> link's...
> Am Sonntag, 18. November 2012 18:07:48 UTC+1 schrieb David Pollak:
>> Also, please use the CSS Selector Transforms rather than the bind()
>> syntax... the CSS Selector Transforms lead to more readable
>> and understandable code.
>> On Sun, Nov 18, 2012 at 2:19 AM, AGYNAMIX Torsten Uhlmann <
>> T.Uh...@agynamix.de> wrote:
>>> Hi Christian,
>>> so you basically want to support a URL like "/blog/<xyz>/list" where xyz
>>> is a category or ID or whatever narrows down the elements to show?
>>> You might need to put the source code into a new sbt skeleton project,
>>> but it still works with the latest Lift libs. There is an example David did
>>> with a list of forums and a list of threads per forum.
>>> Am 18.11.2012 um 11:00 schrieb Christian Thomas <chri...@googlemail.com
>>> >:
>>> oops, I have accidentally post it...
>>> Okay, here my question:
>>> How can I solve it in Lift:
>>> I have to pass the id of each main-category to the snippet, which
>>> generates the entries for the sub-categories ( currently a static known
>>> parentId
>>> val parentId : Long = 1 //in method subCategories
>>> is set to see, I the rest of the code works ) ?
Currently I'm trying to find out, how it work's. But at this first time it is really hard to understand, what there happens (the concrete impl) !
In my example I have got a page blog.html. This contains the snippet above to show the existing categories. Each rendered sub-category is clickable to filter the summary of listed blog-articles.
For instance: /blog <-- has to show all existing blog-article-previews on the blog.html page /blog/category/example <-- has to show all blog-article-previews in relation to the category "example" on the blog.html page /blog/article/example-article <-- has to show the complete article on the article page ( I think I have to create an article folder containing a star.html file )
I have created a small mvn project (contains a lift-app and a tiny Java-Service (in real world it should be an EJB or something else...) ), which shows the current state of my test-project.
This version is still running without error's. May someone can support me to solve my current problem by giving some hints / example code (with may some short comments) appropriate to the small project.
For instance I really don't understand following code:
object AForum { lazy val menu = Menu.param[Forum]("AForum", // for what is this string good for? Simply a label Loc.LinkText(f => Text(S.?("Forum") +": "+f.name)), // ????? (s: String) => { // is this an anonymous function ?? println("Looking up forum "+s) val ret = Forum.find(s) println("Found "+ret) ret // where will the return ret value be used ?? }, (f: Forum) => f.id) / "forums" / * // this defines the dynamic url. the id will be replaced for the *
}
*Thank's in advance!*
Christian
Am Dienstag, 20. November 2012 00:20:21 UTC+1 schrieb David Pollak:
> Please take a look at the project that Torsten pointed you to. > Specifically, the ForumStuff.scala file which contains the logic to create > a menu link based on a parameter:
> class AForum(f: Forum) { > def render = "li *" #> > ForumThread.all(f).map(t => > "a *+" #> t.name & "a [href]" #> AThread.menu.calcHref(f -> t)) > }
> On Sun, Nov 18, 2012 at 10:46 AM, Christian Thomas <chri...@googlemail.com<javascript:> > > wrote:
>> @Torsten big thanks for your help via mail :thumbsup:
>> @Torsten, @David: yes, the css selector transforms is the better way. >> This also simply solved my problem.
>> Now I have to check, how to use the Menu.param to append the dynamic >> link's...
>> Am Sonntag, 18. November 2012 18:07:48 UTC+1 schrieb David Pollak:
>>> Also, please use the CSS Selector Transforms rather than the bind() >>> syntax... the CSS Selector Transforms lead to more readable >>> and understandable code.
>>> On Sun, Nov 18, 2012 at 2:19 AM, AGYNAMIX Torsten Uhlmann < >>> T.Uh...@agynamix.de> wrote:
>>>> Hi Christian,
>>>> so you basically want to support a URL like "/blog/<xyz>/list" where >>>> xyz is a category or ID or whatever narrows down the elements to show?
>>>> You might need to put the source code into a new sbt skeleton project, >>>> but it still works with the latest Lift libs. There is an example David did >>>> with a list of forums and a list of threads per forum.
>>>> Am 18.11.2012 um 11:00 schrieb Christian Thomas <chri...@googlemail.com >>>> >:
>>>> oops, I have accidentally post it...
>>>> Okay, here my question:
>>>> How can I solve it in Lift:
>>>> I have to pass the id of each main-category to the snippet, which >>>> generates the entries for the sub-categories ( currently a static known >>>> parentId >>>> val parentId : Long = 1 //in method subCategories >>>> is set to see, I the rest of the code works ) ?
Okay, now I have continued implementing my example project.
First of all I simply want to create the article navigation:
- behind the "read..." link an appropriate url for the article is requested
- after clicking the "read..." link the article page has to be called and has to show the whole article instead of the article-preview on the blog page
def render = {
/*
TODO:
- adapt class to support filtering by category
- add dynamic href article url
*/
/*
it is not necessary to return all real articles including content. It should be overhead. Only the complete
article is requested, if the visitor wants to read the article
--> An articlePreview knows the id of the article
*/
val articles = asScalaList(BlogJavaService.getAllArticlePreviews)
"* *" #> articles.map {article =>
"@article-title" #> article.getTitle &
"a [href]" #> Article.menu.calcHref(BlogJavaService.getArticle(article.getArticleId)) // TODO this is a first test to see, if something at all will work !!! Normally I do not want to call each article! I'm not really shure, how the Menu.param work's !!!
}
}
this is the render function of the ArticlePreviews snippet. This is used to show on the blog page all existing article-previews (or all previews appropriate to a selected category ( filter function ))
Here is the Article object:
object Article {
/*
* sealed trait MenuSingleton extends AnyRef
* def param[T <: AnyRef](name: String, linkText: LinkText[T], parser: (String) ⇒ Box[T], encoder: (T) ⇒ String): PreParamMenu[T]
*/
lazy val menu = Menu.param[de.java.entities.Article]("Article",
"Reading an article",
articleId => findArticleById(articleId),
article => getIdForArticle(article)
) / "article" / *
/* TODO I dont think, that is the best solution to get the box instance - source:
https://github.com/d6y/london_class_march_2011_sitemap_css/blob/maste... -> def find
*/
val map = Map(articleId -> article)
println("Found article=" + article + " for given id=" + articleId)
val box = map.get(articleId)
println("Returning created box=" + box)
box
}
def getIdForArticle(article: de.java.entities.Article) : String = {
val id = article.getId.toString
println("Returning requested id=" + id + " of article=" + article)
id
}
}
This code will create the required dynamic url's for each "read..." link on the blog page (my first success for that topic). But another solution should be better:
I think I have only to handle the articleId of each article-preview instance to create the url's. And if the user will click the "read..." link, then the whole article has to be loaded.
How do I have to change the Article.menu to solve this?
> Currently I'm trying to find out, how it work's. But at this first time it > is really hard to understand, what there happens (the concrete impl) !
> In my example I have got a page blog.html. This contains the snippet above > to show the existing categories. Each rendered sub-category is clickable to > filter the summary of listed blog-articles.
> For instance:
> /blog <-- has to show all existing blog-article-previews on the blog.html > page
> /blog/category/example <-- has to show all blog-article-previews in > relation to the category "example" on the blog.html page
> /blog/article/example-article <-- has to show the complete article on the > article page ( I think I have to create an article folder containing a > star.html file )
> I have created a small mvn project (contains a lift-app and a tiny > Java-Service (in real world it should be an EJB or something else...) ), > which shows the current state of my test-project.
> This version is still running without error's. May someone can support me > to solve my current problem by giving some hints / example code (with may > some short comments) appropriate to the small project.
> For instance I really don't understand following code:
> object AForum {
> lazy val menu = > Menu.param[Forum]("AForum", // for what is this string good for? > Simply a label
> Loc.LinkText(f => Text(S.?("Forum") +": "+f.name)), > // ?????
> (s: String) => { // is this an anonymous function ??
> println("Looking up forum "+s)
> val ret = Forum.find(s)
> println("Found "+ret)
> ret // where will the return ret value be used ??
> },
> (f: Forum) => f.id) / "forums" / * // this defines > the dynamic url. the id will be replaced for the *
> }
> *Thank's in advance!*
> Christian
> Am Dienstag, 20. November 2012 00:20:21 UTC+1 schrieb David Pollak:
>> Please take a look at the project that Torsten pointed you to. >> Specifically, the ForumStuff.scala file which contains the logic to create >> a menu link based on a parameter:
>> class AForum(f: Forum) {
>> def render = "li *" #>
>> ForumThread.all(f).map(t =>
>> "a *+" #> t.name & "a [href]" #> AThread.menu.calcHref(f -> t))
>> }
>> On Sun, Nov 18, 2012 at 10:46 AM, Christian Thomas <
>> chri...@googlemail.com> wrote:
>>> @Torsten big thanks for your help via mail :thumbsup:
>>> @Torsten, @David: yes, the css selector transforms is the better way. >>> This also simply solved my problem.
>>> Now I have to check, how to use the Menu.param to append the dynamic >>> link's...
>>> Am Sonntag, 18. November 2012 18:07:48 UTC+1 schrieb David Pollak:
>>>> Also, please use the CSS Selector Transforms rather than the bind() >>>> syntax... the CSS Selector Transforms lead to more readable >>>> and understandable code.
>>>> On Sun, Nov 18, 2012 at 2:19 AM, AGYNAMIX Torsten Uhlmann <
>>>> T.Uh...@agynamix.de> wrote:
>>>>> Hi Christian,
>>>>> so you basically want to support a URL like "/blog/<xyz>/list" where >>>>> xyz is a category or ID or whatever narrows down the elements to show?
>>>>> You might need to put the source code into a new sbt skeleton project, >>>>> but it still works with the latest Lift libs. There is an example David did >>>>> with a list of forums and a list of threads per forum.
>>>>> Am 18.11.2012 um 11:00 schrieb Christian Thomas <
>>>>> chri...@googlemail.com>:
>>>>> oops, I have accidentally post it...
>>>>> Okay, here my question:
>>>>> How can I solve it in Lift:
>>>>> I have to pass the id of each main-category to the snippet, which >>>>> generates the entries for the sub-categories ( currently a static known >>>>> parentId >>>>> val parentId : Long = 1 //in method subCategories
>>>>> is set to see, I the rest of the code works ) ?
