Java 如何使用百里香叶和弹簧用列表填充下拉列表
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How do I populate a drop down with a list using thymeleaf and spring
提问by Roman Paolucci
I need to populate a drop down with all the values within a list of strings.
我需要用字符串列表中的所有值填充下拉列表。
Controller Class
控制器类
@RequestMapping(value = "/generateIds", method = RequestMethod.GET)
public String launchPage(Model model) {
List<Municipality> municipalities = rCountryService.finaAllMunicipalities();
//assume the list is populated with values
List<String> countryName = new ArrayList<String>();
for(int i=0; i<municipalities.size(); i++) {
countryName.add(municipalities.get(i).getCountry().toString());
}
model.addAttribute("countryName ", countryName );
return "generateIds";
}
I didn't know where to start for the HTML so I started with this
我不知道从哪里开始 HTML 所以我从这个开始
<select th:field="*{countryName }">
<option value="default">Select a country</option>
<option th:each="${countryName }" th:value="${countryName }"th:text="${countryName }"/>
</select>
What should my html/controller look like to add all of the elements of the list as drop down options?
将列表的所有元素添加为下拉选项时，我的 html/控制器应该是什么样的？
Thanks in advance!
提前致谢！
采纳答案by Hasitha Diluka
This is how I populate the drop down list.I think it may help to you get some idea about it.
这就是我填充下拉列表的方式。我认为这可能有助于您对此有所了解。
Controller
控制器
List<Operator> operators = operatorService.getAllOperaors()
model.addAttribute("operators", operators);
Model
模型
@Entity
@Table(name = "operator")
public class Operator {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
@JsonIgnore
private Long id;
@NotBlank(message="operator Name cannot be empty")
@Column(name = "operator_name", nullable = false)
private String operatorName;
getters and setters ...
}
View
看法
<div class="form-group blu-margin">
<select class="form-control" th:field="${operator.opeId}" id="dropOperator">
<option value="0">select operator</option>
<option th:each="operator : ${operators}" th:value="${operator.id}" th:text="${operator.operatorName}"></option>
</select>
</div>
回答by Thanongsak Chamung
First thank to your question and answer! I've done with this solution.
首先感谢您的问答！我已经完成了这个解决方案。
My Model
我的模特
@Entity
@Table(name = "test")
public class Test {
@Id
private String testCode;
private String testName;
private int price;
public Test() {}
public Test(String testCode, String testName, int price) {
this.testCode = testCode;
this.testName = testName;
this.price = price;
}
public String getTestCode() {
return testCode;
}
public String getTestName() {
return testName;
}
public int getPrice() {
return price;
}
}
My View
我的看法
List<Test> test = new ArrayList<>();
model.addAttribute("test", test);
List<Test> tests = testRepository.findAll();
model.addAttribute("tests", tests);
My HTML
我的 HTML
<div class="col-lg-3" th:object="${test}">
<select class="form-control" id="testOrder" name="testOrder">
<option value="">Select Test Order</option>
<option th:each="test : ${tests}"
th:value="${test.testCode}"
th:text="${test.testCode}+' : '+${test.testName}"></option>
</select>
</div>
My Result
我的结果
回答by Leemarshn
You only need this code in your view.
您只需要在您的视图中使用此代码。
List<Test> tests = testRepository.findAll();
model.addAttribute("tests", tests);
回答by Ranveer Singh
For generating dropdown for the list of String returned in model you just need to use these lines. You don't need to create any model class with extra getter and setter methods. Your code is correct, you just missed the variable name for storing the value returned in countryName list in th:each.
要为模型中返回的字符串列表生成下拉列表，您只需要使用这些行。您不需要使用额外的 getter 和 setter 方法创建任何模型类。您的代码是正确的，您只是错过了用于存储 th:each 中 countryName 列表中返回值的变量名称。
<select th:field="*{countryName}">
<option value="">Select Country</option>
<option th:each="country : ${countryName}" th:value="${country}" th:text="${country}"></option>
</select>
回答by Senthuran
I have implemented a similar where i need to populate the dropdown from the database. For that I retrieved the data from the controller as below
我已经实现了一个类似的地方，我需要从数据库中填充下拉列表。为此，我从控制器中检索了数据，如下所示
@GetMapping("/addexpense")
public String addExpense(Expense expense,Model model){
model.addAttribute("categories",categoryRepo.findAll());
return "addExpense";
}
Then in the thymeleaf I have used the below code.
然后在百里香叶中我使用了下面的代码。
<div class="form-group col-md-8">
<label class="col-form-label">Category </label>
<select id="category" name="category" th:field="*{category.id}" >
<option th:each="category : ${categories}" th:value="${category.id}" th:utext="${category.name}"/>
</select>
</div>
