Thymeleaf对象的绑定列表 [英] Thymeleaf Binding list of objects

问题描述

  @RequestMapping（/ category / edit / {id }）
 @ org.springframework.transaction.annotation.Transactional 
 public ModelAndView displayCategoryList（@PathVariable（id）Integer id）{
 ModelAndView mav = new ModelAndView（category-form ）; 
列表< CatFeatGroup> catFeatGroupList = catFeatGroupService.findGroupsForCategory（id）; 
 mav.addObject（catFeatGroupList，catFeatGroupList）; 
 return mav; 
} 
  

这是我的表单。

 < form class =form-horizo​​ntal> 
< div th：each =catFeatGroup，status：$ {catFeatGroupList}class =form-group> 
< label>位置< / label>< input th：field =catFeatGroupList [$ {status.index}]。positionth：value =$ {catFeatGroup.position}/> 
< label>名称< / label> < input name =catGroupList [$ {status.index}]。nameth：value =$ {catFeatGroup.name}/> 
< / div> 
< button type =submitclass =btn btn-default>提交< / button> 
< / form> 
  

我需要使用 th：field 来绑定该对象，但这个错误显示：

无法解析为表达式：catFeatGroupList [$ {status.index}]。position

解决方案

添加这样的__符号

 < form class =form-horizo​​ntal> 
< div th：each =catFeatGroup，status：$ {catFeatGroupList}class =form-group> 
< label> Position< / label>< input th：field =* {catFeatGroupList [__ $ {status.index} __]。position}th：value =$ {catFeatGroup.position} /> 
< label>名称< / label> < input data-th-name =* {catFeatGroupList [__ $ {status.index} __]。name}th：value =$ {catFeatGroup.name}/> 
< / div> 
< button type =submitclass =btn btn-default>提交< / button> 
< / form> 
  

Here's my Object that I've retrieved from the DB:

@RequestMapping("/category/edit/{id}")
@org.springframework.transaction.annotation.Transactional
public ModelAndView displayCategoryList(@PathVariable("id")Integer id){
    ModelAndView mav = new ModelAndView("category-form");
    List<CatFeatGroup> catFeatGroupList = catFeatGroupService.findGroupsForCategory(id);
    mav.addObject("catFeatGroupList",catFeatGroupList);
    return  mav;
}

Here's my form.

<form class="form-horizontal">
    <div th:each="catFeatGroup,status : ${catFeatGroupList}" class="form-group">
        <label>Position</label><input th:field="catFeatGroupList[${status.index}].position"  th:value="${catFeatGroup.position}" />
        <label>Name</label> <input name="catGroupList[${status.index}].name" th:value="${catFeatGroup.name}" />
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
</form>

I need to use th:field to bind that object however this error shows up:

Could not parse as expression: "catFeatGroupList[${status.index}].position"

解决方案

Add the "__" notation like this

<form class="form-horizontal">
            <div th:each="catFeatGroup,status : ${catFeatGroupList}" class="form-group">
                <label>Position</label><input th:field="*{catFeatGroupList[__${status.index}__].position}"  th:value="${catFeatGroup.position}" />
                <label>Name</label> <input data-th-name="*{catFeatGroupList[__${status.index}__].name}" th:value="${catFeatGroup.name}" />
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
        </form>

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