使用Sprint Boot和Thymeleaf将复选框映射到List

时间:2016-02-28 07:07:15

标签: spring-mvc spring-boot thymeleaf

我有一个使用 Thymeleaf Spring Boot 1.3.0 应用。我在页面上有一个表单,允许用户上传文件。我想添加一些复选框也返回我的控制器。

我还没有找到一个很好的例子,如何以这种方式做复选框。我想我必须在我的模型中定义一个列表,让Thymeleaf显示所有复选框,但我无法使其工作。

这是我的控制器:

@Controller
public class CustomerDataController {

    private static final String SEARCH_TYPES = "searchTypes";

    @RequestMapping(value = "/upload", method = RequestMethod.GET)
    public String displayUpload(Model model) {
        initModel( model );
        return "upload";
    }

    private void initModel(Model model) {
        model.addAttribute( UPLOAD, null );
        // the values to display as check box title & values
        model.addAttribute(SEARCH_TYPES, Arrays.asList("Search A", "Search B"));
        // list to store what the user checks on the UI 
        model.addAttribute("searchValue", new ArrayList<>());
        model.addAttribute( customerResults );
    }

    @Transactional
    @RequestMapping(value = "/userFile", method = RequestMethod.POST)
    public String handleFileUpload(@RequestParam("myFile") MultipartFile file, Model model, Authentication authentication) {

    // looking to get searchValue list, but not sure this is right
    }
}

这里是我的html的重要部分:

<form onsubmit="return validate(this)" action="userFile"
      th:action="@{/userFile}" method="post" enctype="multipart/form-data">
    <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
    <ul>
        <li th:each="search : ${searchTypes}">
            <input type="checkbox" th:field="*{searchValue}" th:value="${search}"/>
            <label th:text="#{${search}}"></label>
        </li>
    </ul>
    <p><input type="file" name="myFile" id="myFile"/></p>
    <p><input type="submit" class="btn btn-success" value="Submit Customer Data"/></p>
    <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
</form>

复选框列表构建正确,但当我选择其中任何一个时,我的控制器模型中都没有显示任何值。

有人可以指出我正确的方向,将选定的复选框列表返回给我的控制器吗?

1 个答案:

答案 0 :(得分:5)

我修复了你的代码。

<强>控制器

我使用initValues()方法用值填充model

我还在@RequestParam List<String> searchValues方法中添加了handleFileUpload()参数。

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import java.util.Arrays;
import java.util.List;

@Controller
public class CustomerDataController {

    private static final String SEARCH_TYPES = "searchTypes";

    @ModelAttribute
    public void initValues(Model model) {
        model.addAttribute(SEARCH_TYPES, Arrays.asList("Search A", "Search B"));
    }

    @RequestMapping(value = "/upload", method = RequestMethod.GET)
    public String displayUpload() {
        return "upload";
    }

    @RequestMapping(value = "/userFile", method = RequestMethod.POST)
    public String handleFileUpload(@RequestParam("myFile") MultipartFile file,
                                   @RequestParam List<String> searchValues) {

        // here you can use searchValues and file
        return "result";
    }
}

<强> upload.html

我将<label th:text="#{${search}}"></label>修改为<label th:text="${search}"></label>

我还修复了<form><input type="checkbox">代码。

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org"
      lang="en"
      xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8"/>
    <title>Upload</title>
</head>
<body>

<form th:action="@{/userFile}" method="post" enctype="multipart/form-data">
    <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
    <ul>
        <li th:each="search : ${searchTypes}">
            <input type="checkbox" name="searchValues" th:value="${search}"/>
            <label th:text="${search}"></label>
        </li>
    </ul>
    <p><input type="file" name="myFile" id="myFile"/></p>
    <p><input type="submit" class="btn btn-success" value="Submit Customer Data"/></p>
    <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
</form>

</body>
</html>