无法访问FTL文件中从Modelmap发送的对象列表 [英] cannot access list of object sent from modelmap in FTL file

问题描述

我是ftl(FreeMarker模板)的新手.我使用这样的模型映射从控制器发送对象列表

Im new to ftl(FreeMarker template). I send a List of object from my controller using model map like this

@RequestMapping(value="/xxx")
public String myMethod(ModelMap model){
  List<MyDTO> dto = mymethods(); // I return some list objects in this method
  model.addAttribute("dto",dto);
  model.addAttribute("dtoLength",dto.size());
  return "myview"; 
}

MyDTO.java

public class myDTO{
  Public String var1;
  Public String var2;

  public String getVar1() {
return var1;
  }
  public void setVar1(String var1) {
this.var1 = var1;
   }      
  public String getVar2() {
return var2;
  }
  public void setVar2(String var2) {
this.var2 = var2;
   } 
}

现在我尝试从我的ftl的javascript访问dto.我尝试了很多这样的方法:

Now i try to access dto from my ftl's javascript.I tried it many ways like this:

 var dto=${dto};

它说$ {....}中必须是字符串，整数，布尔值..等等等等

it said whatever must be inside ${....} should be either string,integer,boolean ..blah blah

所以我想到了这样迭代以获得我想要的东西

So i thought of iterating it like this to get what i want

var valueIWanted;
if(${dtoLength}>0){
  for(var i=0 ; i < ${dtoLength} ; i++){
     ticketList[i] = ${ticket[i].var2};
  }
}

但是我也无法通过这种方式访问​​它.我应该在这里做什么?我想我缺少语法.有人可以帮我吗?

but i was not able to access it this way too.what am i supposed to do in here ?I think i m missing the syntax.Can anyone help me out with this?

推荐答案

您可以通过以下方式轻松访问modelMap数据:

You can easily access modelMap data as :

    <#list dto as dtoList>
    <tr>
        <td>${dtoList.var1}</td> <td>${dtoList.var1}</td>
    </tr>
    </#list>

您不需要发送长度DTO，如果您将其用于其他目的，则可以使用它.

You don't need to send the length of DTO, if you are using it for other purpose then you can use it.

，您可以简单地迭代列表，不需要for循环.

and you can simply iterate list, you don't need for loop.

查看此.

如果要使用JavaScript访问数据，则可以在控制器页面加载时使用ajax请求，并向您发送包含数据的响应，然后处理该数据并在FTL页面上打印.如果可能的话，请使用一些JavaScript框架，以便轻松便捷地处理此类请求.

If you want to access the data using the JavaScript then you can use ajax request on page load on controller and it sends you a response with data and then process that data and print on FTL page. If possible then use some JavaScript framework so to handle such a request become easy and convenient.

仍然可以执行:var dtoList= "${dto}";.不是没有报价.

Still you can do : var dtoList= "${dto}";. not without quote.

请参见 SO答案.

用于检查是否为空:

[#if dto??]
   //inside it write all your code
[/#if]

您可以在此处进行检查.

带有示例.

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