Question

在Spring MVC中，我想在同一页面中创建多个表单。据我说，这在逻辑上是正确的。但它给出了错误

错误：org.springframework.web.servlet.tags.form.HiddenInputTag - BindingResult和bean名称'cost'的普通目标对象都不是可用作请求属性

控制器

@RequestMapping(value = {  "/vehicle_cost" }, method = RequestMethod.GET)
public String vehicleCost(Model model, @RequestParam(defaultValue="0") int vId) {
    List<CostModel> _costs = null;
    List<CurrencyModel> _currencies = accountingService.getCurrencyList();
    List<IdElemModel> _cost_per_types = accountingService.getCostPerTypeList();
    if(vId > 0){
        _costs = operationService.getVehicleCostsByVehicleId(vId);
    }
    else{

    }
    model.addAttribute("costs", _costs);
    model.addAttribute("currencies",_currencies);
    model.addAttribute("cost_per_types",_cost_per_types);
    return "vehicle_management/vehicle_cost";
}

查看

<c:forEach items="${costs}" var="cost">
                    <form:form commandName="cost" method="POST"  action="save_vehicle_cost" cssClass="form-horizontal" role="form">
                    <form:hidden path="costId" />
                    <form:hidden path="costCategoryId" />
                    <div class="form-group">
                        <div class="col-lg-2">
                            <form:input path="cost" cssClass="form-control" />
                        </div>
                        <div class="col-lg-1">
                            <form:input path="taxRatio" cssClass="form-control" />
                        </div>
                        <div class="col-xs-2">
                            <form:select path="currencyId"  cssClass="form-control">
                            <option value="-1">Currency</option>
                                <form:options items="${currencies}" itemLabel="currency"
                                    itemValue="currencyId" />
                                    <form:options/>
                            </form:select>
                        </div>
                        <div class="col-lg-2">
                            <form:select path="costPerTypeId"  cssClass="form-control">
                            <option value="-1">Per Type</option>
                                <form:options items="${cost_per_types}" itemLabel="elem"
                                    itemValue="id" />
                                <form:options/>
                            </form:select>
                        </div>
                        <div class="col-lg-2">
                            <form:input path="periodBegin" cssClass="form-control dateInput" />
                        </div>
                        <div class="col-lg-2">
                            <form:input path="periodEnd" cssClass="form-control dateInput" />
                        </div>
                        <div class="col-lg-1"><button type="submit" class="btn btn-success">SAVE</button>
                        </div>
                    </div>
                    </form:form>
                </c:forEach>

Answer 1

表单期望“cost”在请求中，但是您的循环不会将对象放在正确的范围内。按照标准的Spring MVC模式在控制器中预先填充命令对象，您只需预加载它们：

在您的控制器中，将每个成本对象放入正确的范围，方法是使用“cost_”+ id：

等键加载它们

for(CostModel c: _costs) {
    model.addAttribute("cost_" + c.getId(), c);
}

在渲染表单时，在jsp中，在请求范围中查找“cost _ $ {id}”：

<c:forEach items="${costs}" var="cost">
    <form:form commandName="cost_${cost.id}" method="POST"  action="save_vehicle_cost" cssClass="form-horizontal" role="form">
    ...
...
</c:forEach>

我希望有所帮助。

多形式 - foreach中的表单标签

1 个答案: