我如何从JavaScript和Grails访问变量？ [英] How I access a variable from JavaScript and Grails?

问题描述

我有一个 Grails 变量，它的类型为JASONList，它被渲染一个模板。

有没有一种方法可以从JavaScript函数中访问这个列表？

假设我想让onresize适合屏幕上的所有对象。没有进行数据库调用并从Ajax中重新整理整个列表...

让我们说模板做了这样的事情：

 < g：每个var =reportin =$ {reportList？.myArrayList}> 
< li style =display：inline; list-style：none;> 
< img src =$ {report？.img}> 
< / li> 
< / g：每个> 
< script type =text / javascript> 
 function resize（list）{
 if（list.size< givenSize）//伪代码
 list.subList（）//伪代码
} 
 window.onresize = resize（$ {reportList}）
< / script> 
  

这个问题在于，由于某些原因，Grails gsp不会将$ {reportList}渲染为一个列表。相反，它将它呈现为字符串$ {reportList}。

我可能认为这个问题完全错误，但是有没有办法调整这些对象的大小或获取他们通过document.getElementById或那种性质？

$ reportList由 POJO 为JSON转换...

解决方案

我想出了我的问题。基本上，如果你在Grails中使用POJO，那么Grails作为JSON转换不是很聪明。它所做的只是对对象的toString，而不是可能查看所有公共访问器等。

这有点令人失望，但基本上我需要创建JSON在我的POJO的toString方法中进行转换。

I have a Grails variable which is of type JASONList that is rendered in a template.

Is there a way to access this list from inside a JavaScript function?

Let's say I want onresize to fit all the objects on the screen. Without making a database call and refetching the entire list from Ajax...

Let's say the template does something like this:

<g:each var="report" in="${reportList?.myArrayList}">
  <li style="display:inline; list-style:none;">
    <img src="  ${report?.img}">
  </li>
</g:each>
<script type="text/javascript">
    function resize(list) {
        if (list.size <givenSize) // Pseudocode
            list.subList() // Pseudocode
    }
    window.onresize = resize("${reportList}")
</script>

The problem with this is that for some reason Grails gsp does not render "${reportList}" as a list. Instead it renders it as the string "${reportList}".

I am probably thinking of this problem completely wrong, but is there a way to resize these objects or get them through document.getElementById or something of that nature?

The $reportList is populated by POJO as JSON conversion...

解决方案

I figured out my problem. Basically if you are using POJO in Grails the Grails as JSON conversion is not very smart. All it does is a toString on the object instead of potentially looking at all the public accessors, etc.

It is kind of disappointing, but basically I need to create the JSON conversion in the toString method of my POJO.

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