动态创建GWT CellTable

问题描述

我遇到了GWT CellTable的问题。我需要动态创建celltable，我没有实体（Bean）类来实现。我已经看到所有的celltable的例子，搜索了很多，没有实体类。

我需要根据存储在数据库中的一些元数据动态填充表。我可以创建表结构

考虑有两个类，一个是GRID，另一个是元数据和列定义的COLUMN。 GRID将列表COLUMNS作为列定义

 类GRID {
列表< COLUMN>列; 
} 
 
类COLUMN {
 String columnName; 
} 
  

现在我需要从数据库获取网格并循环列填充单元格（列）如：

  com.google.gwt.user.cellview.client.Column< String，String> textColumn = new Column< String，String>（
 new EditTextCell（））{
 @Override 
 public String getValue（String object）{
 return object; 
} 
}; 
  

现在，我需要向celltable添加一些数据。但没有实体，没有例子如何填充不同的列。我已经尝试过我的自我：（考虑网格有3列）

 列表< String>数据; 
 
 String a1 =A1; 
 String a2 =A2; 
 String a3 =A3; 
 
 data = new ArrayList< String>（）; 
 data.add（a1）; 
 data.add（a2）; 
 data.add（a3）; 
 
 final AsyncDataProvider< String> provider = new AsyncDataProvider< String>（）{
 @Override 
 protected void onRangeChanged（HasData< String> display）{
 updateRowData（0，data）; 
} 
}; 
 provider.addDataDisplay（grid）; 
 provider.updateRowCount（data.size（），true）; 
  

我可以生成如下输出：

  A1 A1 A1 
 
 A2 A2 A2 
 
 A3 A3 A3 
  pre> 
 
 
实际输出应该只是一行，如
  A1 A2 A3 
  
但是没有这样做。 
 
 
 
请帮助。
 
 
 
感谢，
 
 
 
请问，
解决方案
您可以将行表示为列表< String> 实例，您必须将您的参数化从 String 更改为列表< String>  >网格，列和数据提供者;当然，您必须使用列表< String< String> 调用 updateRowData ，而不是列表< String> 。
 
 
 
您还需要一个列列，通过索引将值从列表< String> 中取值：
  class IndexedColumn extends Column< List< String>，String> 
 private final int index; 
 public IndexedColumn（int index）{
 super（new EditTextCell（）; 
 this.index = index; 
} 
 
 @Override 
 public String getValue（List< String> object）{
 return object.get（this.index）; 
} 
} 
  
 
I am stuck in a problem with GWT CellTable. I need to create celltable dynamically and I dont have entity (Bean) class to do so. I have seen all the examples of celltable and searched a lot to do so without entity class.
I need to populate table dynamically according to some metadata stored in database. I am able create table structure 
Consider there are two classes one is GRID and another is COLUMN for the metadata and columns definition. GRID will have list of COLUMNS as a columns definition
    Class GRID {
List<COLUMN> columns;
}

Class COLUMN {
  String columnName;
}
Now i need to get grid from database and loop the columns to populate the cells (Columns) like :
com.google.gwt.user.cellview.client.Column<String, String> textColumn = new Column<String, String>(
                        new EditTextCell()) {
                    @Override
                    public String getValue(String object) {
                        return object;
                    }
                };
Now, I need to add some data to the celltable. but without entity there are no example how to populate the different columns. I have tried my self like : (Consider Grid have 3 columns)
List<String> data;

String a1 = "A1";
            String a2 = "A2";
            String a3 = "A3";

            data = new ArrayList<String>();
            data.add(a1);
            data.add(a2);
            data.add(a3);

final AsyncDataProvider<String> provider = new AsyncDataProvider<String>() {
            @Override
            protected void onRangeChanged(HasData<String> display) {
                updateRowData(0, data);
            }
          };
          provider.addDataDisplay(grid);
provider.updateRowCount(data.size(), true);
I am able to produce the output like :
A1 A1 A1

A2 A2 A2

A3 A3 A3
Actually output should be one row only like 
A1 A2 A3
But failed to do so. 
Please help.
Thankx,
Regards,
 解决方案 
You can represent your "rows" as List<String> instances, you have to change your parameterization from String to List<String> in your Grid, Column and data provider; and of course you have to call updateRowData with a List<List<String>>, not a List<String>.
You also need one Column instance per column, taking the value out of the List<String> by index:
class IndexedColumn extends Column<List<String>, String>
   private final int index;
   public IndexedColumn(int index) {
     super(new EditTextCell();
     this.index = index;
   }

   @Override
   public String getValue(List<String> object) {
      return object.get(this.index);
   }
}
                        
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