在play framework 2.0中为java列表分配变量

Question

I need to access a Java list from html code in play. My list is returned by a public static method:

ComboboxOpts.getListOfValues()

I am using this method several times in my scala code want to assign it to some variable. Maybe something similar to this

@mylist = ComboboxOpts.getListOfValues()

So that I can use it like this

@for(i <- 0 to mylist.size -1){
    //Do stuff
}

rather than this

@for(i <- 0 to ComboboxOpts.getListOfValues.size -1){
    //Do stuff
}

Answer 1

You can use defining() to set new variables, such as:

@defining(getName() + " " + getType()) { text => 
  Hello @text!
}

However, for your case, you can just iterate over a list as follows:

@for(value <- ComboboxOpts.getListOfValues()) {
  <li>@value</li>
} 

This will not call your function repeatedly, and is much more expressive. The Play documentation has several related examples: http://www.playframework.org/documentation/2.0/JavaTemplates

If you absolutely need the index as well, try using Scala's zipWithIndex() .

Answer 2

1. public class Application extends Controller {
2. public static Result index() {
3. List myList = new ArrayList();
4. myList.add("one");
5. myList.add("two");
6. return ok(index.render(myList));
7. }
8. }
9. @(myList: List[String])
10. @main("Welcome to Play 2.0") {
11. @for(item
12. @item
13. }
14. }