I'm trying to create a dynamic list of URLs in Twirl template with Play with no luck. I can't seem to map over a collection to create list of URLs for some reason. This is what I have:
#casesCollection.map(e => {
<td>#e.name</td>
})
The part within the href does not compile. Any ideas how this issue can be solved?
You've not given enough details about the type of casesCollection and the error you're getting.
Here's a simplified example that works:
In the controller:
def index = Action {
val casesCollection = List("A", "B", "C")
Ok(views.html.xxx(casesCollection))
}
The view xxx.scala.html:
#(casesCollection: List[String])
<ul>
#casesCollection.map { e =>
<li>#e</li>
}
</ul>
In my example casesCollection is a simple List of Strings. You may have a list of some sort of objects, but it should be easy to adapt.
Related
I've got a list(string) with an unknown length which I would like to render in my ReasonReact component. I've read that there is no built-in support for printing complex data structures. But how would one go about rendering a list in its component in a pure functional way without using Javascript? I've found a snippet that achieves this using recursion on pattern matching. I presume there must be an easier way as this seems like a rather often-used operation.
The Javascript equivalent of what I'm trying to achieve is Array.toString().
If I understand you correctly, there are two steps you want accomplished:
To create a string out of the list(string), preferably formatted in the same way Array.toString does, i.e. comma-separated without surrounding square brackets, and without using any JavaScript-specific APIs.
To render the string as a ReasonReact component.
Step 1: String conversion
This can be done using String.concat:
let myList = ["a", "b", "c"];
let myString = String.concat(", ", myList);
which will return "a, b, c"
Step 2: Render as ReasonReact component
Rendering strings in ReasonReact are done using ReasonReact.string. Here's a complete, runnable example of a component taking a prop items of type list(string) and rendering it in a <span> element.
module ListRenderer = {
let component = ReasonReact.statelessComponent("ListRenderer");
let make = (~items, _children) => {
...component,
render: _self =>
<span> {ReasonReact.string(String.concat(", ", items))} </span>
};
};
ReactDOMRe.renderToElementWithId(<ListRenderer items=["a", "b", "c"] />, "preview");
Playground link
I use SetHtml() all the time to swap chunks of HTML as part of the return trip of an ajax call, ie. when my "Edit Item" ajax call returns, I swap the contents of with form elements representing the "Item" to be edited.
Now I'm trying to add a new item to a list (so that "Item 2" appears as the next li under "Item 1"). My html looks like (this is a greatly simplified version) this:
<div data-lift="form.ajax">
<div data-lift="JsCmdTest">
<test:submitbutton></test:submitbutton>
<ul id="targetdiv">
<li>Item 1</li>
</ul>
</div>
</div>
and my Lift code looks like this
class JsCmdTest extends StatefulSnippet
{
def dispatch = { case "render" => render }
def bindStuff(ns: NodeSeq): NodeSeq =
{
bind("test", ns,
"submitbutton" -> SHtml.ajaxButton("Go", ()=> {
val newLi = Jx(<div>Item 2</div>)
(ElemById("targetdiv") ~> JsFunc("appendChild", newLi.toJs)).cmd
})
)
}
def render: (NodeSeq)=>NodeSeq = (ns: NodeSeq) => {
bindStuff(ns)
}
}
When I run this, the ajax call is fired, and the response looks fine, but I get the following error in the browser console:
The server call succeeded, but the returned Javascript contains an error: NotFoundError: Failed to execute 'appendChild' on 'Node': The new child element is null.
WANTED: a way to append replacement HTML to an existing < ul >. I feel like the way I'm going about appending seems way more esoteric than probably needed, but i haven't found any other way to do it.
Thanks in advance!
you're using a very old syntax for binding. If I am not mistaken, a new way for bindings was introduced somewhere in lift-2, and it is the recommended one since somewhere in lift-2.2. (I'll write the syntax below.)
JsFunc is an anonymous function, like def local(a: A): B. You don't need to send anonymous function, you can send the code directly. (See below.)
So, I recommend something like this:
import net.liftweb.http.js.{JsExp, JsCmd, JsCmds}
import net.liftweb.http.js.jquery.JqJE.{JqAppend, JqId}
def render = {
val appendJs: JsExp = JqId("targetdiv") ~> JqAppend(newLi)
"#mySubmitButton" #> SHtml.ajaxButton("Go", () => appendJs.cmd)
}
You'll also have to adapt the HTML a little, like using a normal <button> with id="mySubmitButton".
I'm trying to extract the parameter from a Lift Menu.param within a snippet so that I can use it to create a named Comet. However, I get a NullPointerException when I try to pass the parameter to the snippet using SnippetDisptach in my Boot.scala, as suggested here:
http://comments.gmane.org/gmane.comp.web.lift/44299
I've created the Menu item as follows:
object AnItemPage {
// create a parameterized page
def menu = Menu.param[Item]("Item", "Item",
s => fetchItem(s), item => item._id.toString) / "item"
private def fetchItem(s:String) : Box[Item] = synchronized {
ItemDAO.findById(ObjectId.massageToObjectId(s))
}
}
I've added the menu to SiteMap. I've also created a Snippet which I would like to pick up the Item parameter. (I'm using fmpwizard's InsertNamedComet library here):
class AddCometItemPage(boxedItem: Box[Item]) extends InsertNamedComet with DispatchSnippet{
val item : Item = boxedItem.openOr(null)
override lazy val name= "comet_item_" + item._id.toString
override lazy val cometClass= "UserItemCometActor"
def dispatch = null
}
My next step is to crate an instance of this class as demonstrated by David Pollak here:
http://comments.gmane.org/gmane.comp.web.lift/44299
This is what I have added to my Boot.scala:
LiftRules.snippetDispatch.append {
case "item_page" => new AddCometItemPage(AnItemPage.menu.currentValue)
}
My item.html references this snippet:
<div class="lift:item_page">
I get the following null pointer exception when I compile and run this:
Exception occurred while processing /item/5114eb4044ae953cf863b786
Message: java.lang.NullPointerException
net.liftweb.sitemap.Loc$class.siteMap(Loc.scala:147)
net.liftweb.sitemap.Menu$ParamMenuable$$anon$9.siteMap(Menu.scala:170)
net.liftweb.sitemap.Loc$class.allParams(Loc.scala:123)
net.liftweb.sitemap.Menu$ParamMenuable$$anon$9.allParams(Menu.scala:170)
net.liftweb.sitemap.Loc$class.net$liftweb$sitemap$Loc$$staticValue(Loc.scala:87)
net.liftweb.sitemap.Menu$ParamMenuable$$anon$9.net$liftweb$sitemap$Loc$$staticValue(Menu.scala:170)
net.liftweb.sitemap.Loc$$anonfun$paramValue$2.apply(Loc.scala:85)
net.liftweb.sitemap.Loc$$anonfun$paramValue$2.apply(Loc.scala:85)
net.liftweb.common.EmptyBox.or(Box.scala:646)
net.liftweb.sitemap.Loc$class.paramValue(Loc.scala:85)
net.liftweb.sitemap.Menu$ParamMenuable$$anon$9.paramValue(Menu.scala:170)
net.liftweb.sitemap.Loc$$anonfun$currentValue$3.apply(Loc.scala:114)
net.liftweb.sitemap.Loc$$anonfun$currentValue$3.apply(Loc.scala:114)
net.liftweb.common.EmptyBox.or(Box.scala:646)
net.liftweb.sitemap.Loc$class.currentValue(Loc.scala:114)
net.liftweb.sitemap.Menu$ParamMenuable$$anon$9.currentValue(Menu.scala:170)
bootstrap.liftweb.Boot$$anonfun$lift$8.apply(Boot.scala:107)
bootstrap.liftweb.Boot$$anonfun$lift$8.apply(Boot.scala:106)
net.liftweb.util.NamedPF$$anonfun$applyBox$1.apply(NamedPartialFunction.scala:97)
net.liftweb.util.NamedPF$$anonfun$applyBox$1.apply(NamedPartialFunction.scala:97)
net.liftweb.common.Full.map(Box.scala:553)
net.liftweb.util.NamedPF$.applyBox(NamedPartialFunction.scala:97)
net.liftweb.http.LiftRules.snippet(LiftRules.scala:711)
net.liftweb.http.LiftSession$$anonfun$net$liftweb$http$LiftSession$$findSnippetInstance$1.apply(LiftSession.scala:1506)
net.liftweb.http.LiftSession$$anonfun$net$liftweb$http$LiftSession$$findSnippetInstance$1.apply(LiftSession.scala:1506)
net.liftweb.common.EmptyBox.or(Box.scala:646)
net.liftweb.http.LiftSession.net$liftweb$http$LiftSession$$findSnippetInstance(LiftSession.scala:1505)
net.liftweb.http.LiftSession$$anonfun$locateAndCacheSnippet$1$1$$anonfun$apply$88.apply(LiftSession.scala:1670)
net.liftweb.http.LiftSession$$anonfun$locateAndCacheSnippet$1$1$$anonfun$apply$88.apply(LiftSession.scala:1669)
Has anybody any idea where I'm going wrong? I've not been able to find a lot of information on Menu.param.
Thank you very much for your help.
f
I have never tried what you are doing, so I am not sure the best way to accomplish it. The way you are using the Loc Param, you are extracting a variable from a URL pattern. In your case, http://server/item/ITEMID where ITEMID is the string representation of an Item, and which is the value that gets passed to the fetchItem function. The function call will not have a value if you just arbitrarily call it, and from what I can see you are requesting a value that is not initialized.
I would think there are two possible solutions. The first would be to use S.location instead of AnItemPage.menu.currentValue. It will return a Box[Loc[Any]] representing the Loc that is currently being accessed (with the parameters set). You can use that Loc to retrive currentValue and set your parameter.
The other option would be to instantiate the actor in your snippet. Something like this:
item.html
<div data-lift="AnItemPage">
<div id="mycomet"></div>
</div>
And then in your AnItemPage snippet, something like this:
class AnItemPage(item: Item) {
def render = "#mycomet" #> new AddCometItemPage(item).render
}
I haven't tested either of those, so they'll probably need some tweaking. Hopefully it will give you a general idea.
I have a problem with my lift view. The thing is, I am making an expensive remote rest-api call twice - where I should really need to do it only once.
But I can't figure out how to solve this.
Basically I have an HTML template like this, that needs to display the list of users and their count:
//UserSearchResults.html
Num users: <span class="lift:UserSearchResults.userCount"></span>
User list:
<ul>
<lift:UserSearchResults.userList>
<li><user:userName/></li>
</lift:UserSearchResults.userList>
</ul>
And then I have an actual snippet that goes and retrieves the list of users from the rest-api server. However, note that it actually does this TWICE - once to count the number of users, and once to render the list.
//UserSearchResults.scala
/** Get list of users from api */
def users: List[User] = {
val url = "http://server/rest-api/user-search";
val result = io.Source.fromURL(url).mkString
//... parse users into List[User] and return it
return entries
}
/** Render user count */
def userCount =
"* *" #> users.length //<-- ONE call
def userList(in: NodeSeq): NodeSeq = {
users.flatMap(user => Helpers.bind("user", in, //<--SECOND call
"userName" -> user.user_name))
}
Is there a better place to put the api call? Is there like a "constructor" for the snippet, that I can use cache the user list, and to share it across all the functions in the class?
Any help is appreciated.
If UserSearchResults is a class (as opposed to an object), then there will be a per-request instance of that class. As such, all you have to do is change your def users to a lazy val users and you should be good to go.
If your snippet extends StatefulSnippet, you can just save the list in an instance variable. Another option would be to put the list into a RequestVar. Then it could also be accessed from other snippets.
Given a String list
val www = List("http://bloomberg.com", "http://marketwatch.com");
I want to dynamically generate
<span id="span1">http://bloomberg.com</span>
<span id="span2">http://marketwatch.com</span>
def genSpan(web: String) = <span id="span1"> + web + </span>;
www.map(genSpan); // How can I pass the loop index?
How can I use the Scala map function to generate the ids (span1, span2), as 1 and 2 are the loop indexes?
Or is the only way is to use for comprehension?
The easiest way is to use zipWithIndex which turns a list into a list of tuples (value,index). In your case,
def genSpan(web: String, id: Int) = {
<span id={ "span%d".format(id) }> { web } </span>
}
www.zipWithIndex.map(x => genSpan(x._1,x._2+1))
Note that the index, x._2, starts from zero but you want to start from one, so I added one in the call to genSpan. Note also that you can set attributes using Scala code by wrapping the Scala code in {}.