如何将地图列表传递给GSP页面视图并对其进行迭代 [英] How to pass a List of Maps to a GSP page view and iterate over it

问题描述

假设我们想要显示关于文件夹文件的信息。我们必须将每个文件的信息保存在一个Map中。然后，将这些地图添加到列表中。

控制器操作：

  def show（）{
 
列出结果= new ArrayList（）; 
 
文件dir = getDir（params.id）; 
 
 if（dir.exists（））{
 dir.eachFile {
 
 Map fileInformation = new java.util.LinkedHashMap（）
 
 fileInformation.put（name，it.getName（））; 
 fileInformation.put（size，it.length（））; 
 fileInformation.put（path，it.getAbsolutePath（））; 
 
 results.add（fileInformation）; 
 
 
 
 $ files_folderData $ result 
 $ b $ / code> 

也许，这是我在视图中获取数据的最佳尝试（我遵循这里没有运气）：



 < g：每个in =$ {filesOfFolderData}> 
 
< p> it：$ {it}< / p> 
< p> it.properties：$ {it.properties}< / p> 
 
  
< p> propertyEntry.key：$ {propertyEntry.key}< / p> 
< p> propertyEntry.value：$ {propertyEntry.value}< / p> 
< p> propertyEntry.value.name：$ {propertyEntry.value}< / p> 
 
< / g：每个> 
 
< / g：每个> 
  

这是互联网浏览器显示的内容（注意：结果的第一行可能有点儿不同的，因为我简化了代码，所以我的客人，结果在我的案件的真实结果的基础）：

$ $ p $ it：[{ name = wololo1，size = 35，path = c：\}，{name = wololo2，size = 35，path = c：\}]

it.properties：{class = class java .util.ArrayList，empty = false}

propertyEntry.key：class
$ b propertyEntry.value：类java.util.ArrayList
$ b $ propertyEntry。 value.name：类java.util.ArrayList

propertyEntry.key：空

propertyEntry.value：false

propertyEntry.value.name： false


我们如何迭代列表？

解决方案

通过地图中的每个，您可以访问键和 value ，因此只需迭代该值即可。

 < g：每个in =$ {filesOfFolderData} VAR = 文件 > 
  ... 
< / g：每个> 
< / g：每个> 
  

Let's say we want to show information about the files of a folder. We have to save the information of each file in a Map. Then, add these Maps to a List.

Controller action:

def show() {

    List results = new ArrayList();

    File dir = getDir(params.id);

    if (dir.exists()) {
        dir.eachFile { 

        Map fileInformation= new java.util.LinkedHashMap()

        fileInformation.put("name", it.getName());
        fileInformation.put("size", it.length());
        fileInformation.put("path", it.getAbsolutePath() );

        results.add(fileInformation);

        }
    }

    [filesOfFolderData: result]
}

Maybe, this is my best attempt to get the data in the view (I followed the approach of here with no luck):

<g:each in="${filesOfFolderData}">

    <p> it: ${it}</p>
    <p> it.properties: ${it.properties} </p>

    <g:each var="propertyEntry" in="${it.properties}">

        <p> propertyEntry.key: ${propertyEntry.key} </p>
        <p> propertyEntry.value: ${propertyEntry.value} </p>
        <p> propertyEntry.value.name: ${propertyEntry.value} </p>           

    </g:each>

</g:each>

This is what the Internet Browser shows (note: the first line of the result could be a little bit different as I simplify the code so I guest that result in base of the real result of my case):

it: [{name=wololo1, size=35, path=c:\}, {name=wololo2, size=35, path=c:\}]

it.properties: {class=class java.util.ArrayList, empty=false}

propertyEntry.key: class

propertyEntry.value: class java.util.ArrayList

propertyEntry.value.name: class java.util.ArrayList

propertyEntry.key: empty

propertyEntry.value: false

propertyEntry.value.name: false 

How could we iterate over the List?

解决方案

With each in maps you have access to the key and value, so just iterate over the value.

<g:each in="${filesOfFolderData}" var="files">
  <g:each in="${files.value}" var="file">
    ...
  </g:each>
</g:each>

这篇关于如何将地图列表传递给GSP页面视图并对其进行迭代的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！