将对象的对象绑定到窗体

Question

我有以下型号：

public class Color {
    public String name;
    public Long id;
    public String rgb;
//setters, getters
}

public class Product {

  private static List<Product> products;

  static {
    products = new ArrayList<Product>();
    products.add(new Product("1111111111111", "Paperclips 1",
        "Paperclips description 1", new Color(1L,"yellow","ff4400")));
    products.add(new Product("2222222222222", "Paperclips 2",
        "Paperclips description ",new Color(2L,"red","ff1100")));
    products.add(new Product("3333333333333", "Paperclips 3",
        "Paperclips description 3",new Color(3L,"brown","ff8800")));
    products.add(new Product("4444444444444", "Paperclips 4",
        "Paperclips description 4",new Color(4L,"blue","ff4400")));
    products.add(new Product("5555555555555", "Paperclips 5",
        "Paperclips description 5",new Color(5L,"black","ff4400")));
  }

  @Constraints.Required
  public String ean;
  @Constraints.Required
  public String name;
  public String description;
  public Color color;

  public Product() {
  }

  public Product(String ean, String name, String description, Color color) {
    this.ean = ean;
    this.name = name;
    this.description = description;
    this.color = color;
  }
//other methods required by controller
}

以及显示产品表单的视图：

@(productForm: Form[Product])
@import helper._
@import helper.twitterBootstrap._

@main("Product form") {
  <h1>Product form</h1>
  @helper.form(action = routes.Products.save()) {
    <fieldset>
      <legend>Product (@productForm("name").valueOr("New"))</legend>
      @helper.inputText(productForm("ean"), '_label -> "EAN")
      @helper.inputText(productForm("name"),'_label -> "Name")
      @helper.textarea(productForm("description"), '_label -> "Description")
      @helper.inputText(@productForm("color.id"),'_label -> " @productForm('color.name') : @productForm('color.rgb')")
    </fieldset>
    <input type="submit" class="btn btn-primary">
     <a class="btn" href="@routes.Products.index()">Cancel</a>
  }
}

我的问题涉及以下行：

@helper.inputText(@productForm("color.id"),'_label -> " @productForm('color.name') : @productForm('color.rgb')")

我知道这是不正确的，但我需要这样的东西，即访问表单中对象的对象，并且它还应该像表单[Product] 的任何字段一样是可绑定和不可绑定的。可能吗？如果不是，人们通常如何处理此类案件？

Answer 1

您可以使用 value 访问字段的内容，例如

productForm("color.name").value.getOrElse("unknown")

如果它有点笨拙，或者你想重用它，你可以将它定义为模板变量 defining:

@defining( productForm("color.name").value.getOrElse("unknown")+" : "+productForm("color.rgb").value.getOrElse("-") ) { colorLabel =>
   @helper.inputText(@productForm("color.id"), '_label -> colorLabel)

将对象的对象绑定到窗体

Binding Object of an object to Form

java

forms

custom-formatting

playframework-2.3