Question

我尝试将bean绑定到表单中的表单片段：

[#ftl/]
[#import "spring.ftl" as spring /]
[#import "panda.ftl" as panda /]

[#import "discoveryProject.ftl" as discoveryProject/]
[#macro defineProjectForm newProject]
[@spring.bind "discoveryProjectDetailsBean"/]

[#if newProject?has_content && newProject =="true"]
<table class="transparentTable">
    <tr>
        <!--Left Part-->
        <td>
            <table>
                <tr>
                    <td>
                        [@spring.showErrors " " "errors"/]
                        <span>Data Source<sup><span style="color: red; ">*</span></sup></span>
                    </td>
                    <td>
                        <select id="dataSourceSelect" onchange="checkSelectChanges()">
                            [#if discoveryProjectLookupBean.dataSources?has_content]
                                [#list discoveryProjectLookupBean.dataSources as dataSource]
                                    <option id="${dataSource.id}" value="${dataSource.name}">${dataSource.name}</option>
                                [/#list]
                            [/#if]
                        </select>
                    [@spring.bind path="discoveryProjectDetailsBean.discoveryProjectBean.dataSource"/]
                    </td>
                </tr>
            </table>

将此提交给控制器，该控制器的代码段：

@RequestMapping("/navigateDiscoveryProject")
ModelAndView navigateDiscoveryProject(@RequestParam("index")String i,@RequestParam("direction")String direction,
        @ModelAttribute("discoveryProjectDetailsBean")DiscoveryProjectDetailsBean discoveryProjectDetailsBean,BindingResult result,HttpSession session)throws Exception{
    logger.info("method invoked");
    int index=Integer.parseInt(i);
    //another code
}

bean discoveryProjectDetailsBean包含的属性实际上是另一个bean discoveryProjectBean这个bean的属性总是为null但是我自己在ftl中将它们绑定在上面的dataSource属性示例中，所有属性的值都是discoveryProjectBean始终为空。

Answer 1

我找到了两个问题的答案。第一种方法是单独绑定每个属性，看我只绑定命令对象，而我应该将每个属性绑定到其特定的控制器。像这样

[#ftl/]
[#import "spring.ftl" as spring /]
[#import "panda.ftl" as panda /]

[#import "discoveryProject.ftl" as discoveryProject/]
[#macro defineProjectForm newProject]
// this is useless [@spring.bind "discoveryProjectDetailsBean"/]

[#if newProject?has_content && newProject =="true"]
<table class="transparentTable">
    <tr>
        <!--Left Part-->
        <td>
            <table>
                <tr>
                    <td>
                        [@spring.showErrors " " "errors"/]
                        <span>Data Source<sup><span style="color: red; ">*</span></sup></span>
                    </td>
                    <td>
                        <select id="discoveryProjectBean.dataSource" name="discoveryProjectBean.dataSource" onchange="checkSelectChanges()">
                            [#if discoveryProjectLookupBean.dataSources?has_content]
                                [#list discoveryProjectLookupBean.dataSources as dataSource]
                                    <option id="${dataSource.id}" value="${dataSource.name}">${dataSource.name}</option>
                                [/#list]
                            [/#if]
                        </select>
//the following binding work just fine
                        [@spring.bind path="discoveryProjectDetailsBean.discoveryProjectBean.dataSource"/]
                    </td>
                </tr>
            </table>

我上面做的是我从命令对象获取我需要的属性，将其设置为select标记的名称和ID，并使用@spring.bind将标记绑定到属性。

这是最好的解决方案

另一种方法是这样做：

[#ftl/]
[#import "spring.ftl" as spring /]
[#import "panda.ftl" as panda /]

[#import "discoveryProject.ftl" as discoveryProject/]
[#macro defineProjectForm newProject]
[@spring.bind "discoveryProjectDetailsBean"/]

[#if newProject?has_content && newProject =="true"]
<table class="transparentTable">
    <tr>
        <!--Left Part-->
        <td>
            <table>
                <tr>
                    <td>
                        [@spring.showErrors " " "errors"/]
                        <span>Data Source<sup><span style="color: red; ">*</span></sup></span>
                    </td>
                    <td>
                        [@spring.bind "dataSources"/]
                [@spring.formSingleSelect "discoveryProjectDetailsBean.discoveryProjectBean.dataSource" dataSources "disabled='disabled' multiple='multiple' class='singleList' onchange='checkValidations()'" /]

                    </td>
                </tr>
            </table>

这没有提供更少的编码，但是对select标签中的选项列表提供了限制，请参阅获取字符串列表以将其绑定到@spring.formSingleSelect这是上面代码中的dataSources如果此列表不是字符串列表，则会生成freemarker.template.TemplateException的freemarker异常：我希望这会对某人有所帮助

Bean使用Freemarker绑定形成

1 个答案:

这是最好的解决方案