java Tapestry5 <select>

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Java XML HTML

16.public class Brand {
17.
18.    private String id;
19.    private String description;
20.
21.    public Brand() {}
22.
23.    public Brand(String id, String description) {
24.        this.id = id;
25.        this.description = description;
26.    }
27.
28.    public String getId() {
29.        return id;
30.    }
31.
32.    public String getDescription() {
33.        return description;
34.    }
35.
36.}
37.
38.
39.Test.java
40.
41.public class Test {
42.
43.    @Persist
44.    private Brand brand;
45.
46.    @Persist
47.    private List<Brand> brands;
48.
49.    public Brand getBrand() {
50.        return brand;
51.    }
52.
53.    public void setBrand(Brand brand) {
54.        this.brand = brand;
55.    }
56.
57.    private List<Brand> getBrands()
58.    {
59.        if(brands == null) {
60.            brands = new ArrayList<Brand>();
61.            brands.add(new Brand("1", "Brand 1"));
62.            brands.add(new Brand("2", "Brand 2"));
63.            brands.add(new Brand("3", "Brand 3"));
64.            brands.add(new Brand("4", "Brand 4"));
65.        }
66.
67.        return brands;
68.    }
69.
70.    public BrandSelectModel getBrandSelectModel() {
71.        return new BrandSelectModel(getBrands());
72.    }
73.
74.    public BrandValueEncoder getBrandValueEncoder() {
75.        return new BrandValueEncoder(getBrands());
76.    }
77.
78.    public class BrandValueEncoder implements ValueEncoder<Brand> {
79.
80.        private List<Brand> brands;
81.
82.        public BrandValueEncoder(List<Brand> brands) {
83.            this.brands = brands;
84.        }
85.
86.        public String toClient(Brand brand) {
87.            return brand.getDescription();
88.        }
89.
90.        public Brand toValue(String string) {
91.            for(Brand brand : brands) {
92.
93.if(brand.getDescription().equals(string)) {
94.                    return brand;
95.                }
96.            }
97.            return null;
98.        }
99.
100.    }
101.
102.    public class BrandSelectModel implements SelectModel {
103.
104.        private List<Brand> brands;
105.
106.        public BrandSelectModel(List<Brand> brands) {
107.            this.brands = brands;
108.        }
109.
110.        public List<OptionGroupModel> getOptionGroups() {
111.            return null;
112.        }
113.
114.        public List<OptionModel> getOptions() {
115.            List<OptionModel> optionModelList = new
116.ArrayList<OptionModel>();
117.            for(Brand brand: brands) {
118.                optionModelList.add(
119.                    new OptionModelImpl(
120.                        brand.getDescription(),
121.                        false,
122.                        brand,
123.                        new String[0]
124.                    )
125.                );
126.            }
127.            return optionModelList;
128.        }
129.
130.    }
131.
132.}
xml 代码

1.Test.html
2.
3.<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd">
4.<t:form>
5.
6.    <select t:type="select" t:id="brand"
7.        value="brand" model="brandSelectModel"
8.encoder="brandValueEncoder"
9.        onchange="this.form.submit();" />
10.
11.    <br/>
12.
13.    <t:if test="brand">
14.        ${brand.description}
15.    </t:if>
16.
17.</t:form>
18.</html>

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