小编典典

使用Sprint Boot和Thymeleaf将复选框映射到列表

spring-boot

我有一个使用 Thymeleaf*Spring Boot 1.3.0
应用程序。我在页面上有一个表格,允许用户上传文件。我想添加一些复选框,也将返回到我的控制器。
*

我还没有找到一个很好的示例,说明如何以这种方式进行复选框。我认为我必须在模型中定义一个列表,并让Thymeleaf显示所有复选框,但是我无法使其工作。

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
    }
}

这是我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>

复选框列表会正确构建,但是当我选择其中任何一个时,控制器模型中都不会显示任何值。

有人可以向我指出正确的方向,以将所选复选框的列表返回给我的控制器吗?


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2020-05-30

共1个答案

小编典典

我已经修复了您的代码。

控制者

我使用initValues()方法来填充model值。

我也@RequestParam List<String> searchValueshandleFileUpload()方法添加了参数。

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";
    }
}

upload.html

我固定<label th:text="#{${search}}"></label><label th:text="${search}"></label>

我也固定<form><input type="checkbox">标签。

<!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>
2020-05-30