Primefaces动态列，以编程方式 [英] Primefaces dynamic columns, programmatically

问题描述

我正在使用Primefaces重写(非常大的)旧的Richfaces应用程序.我现在遇到一种情况，我得到两个列表，一个带有列名，一个带有应该表示为行的对象.

I'm in the process of rewriting a (very) big and old Richfaces application using Primefaces. I now have a situation where I get two lists, one with column names and one with objects that should be represented as rows.

对象看起来像这样:

public class AVeryGenericThingThatIDoNotLike {
    Object[] values;
    //Other parameters that I dont care about
}

当我应该显示此内容时，我希望它将values [0]映射到第一列，values [1]映射到第二列，依此类推.

When I should display this I want it to map values[0] to the first column, values[1] to the second and so forth.

我已经看了primefaces展示，并且有一个动态列的示例，但是我尝试过，但是当我不知道可以存在哪些列时，我无法使它工作.我不知道这一点的原因是，这些列是从一个包含行的数据库中决定的，该行会说应该存在哪些列，并且可以更改，因此，我无法像展示示例中那样构建一个类来使所有列都可用

I have looked at the primefaces showcase and there is an example of dynamic columns but I have tried that and I can not get it to work when I do not know what columns that can exist. The reason that I do not know this is that the columns are decided from a database that holds a row saying what columns that should exist and this can change, so I can not build a class to have all the columns available like in the showcase example.

有人可以在这里给我指点吗?我已经坚持了几天，我真的需要帮助.

Can anyone give me any pointers here? I've been stuck on this for a few days and I really need help.

现在，它可以与Laabidi Raissi的解决方案一起使用.我现在的问题是，对于某些列，我希望呈现按钮和命令链接.通过这种方法，我只能获取字符串，并且如果我尝试返回诸如CommandButtons之类的对象，它将仅打印Java对象哈希.

Now it is kinda working with the solution from Laabidi Raissi. My problem now is that for some columns I want to have buttons being rendered and command links. With this approach I am only able to get strings and if I try to return objects like CommandButtons it will just print a java object hash.

推荐答案

如果您使用的是JSF2，那么我认为该解决方案可能对您有用.首先，在您的托管bean中，从数据库(动态)构建列列表，然后:

If you are using JSF2, then I think this solution may work for you. First, in your managed bean, you build your list of columns (dynamically) from DB, and then:

<p:columns value="#{yourManagedBean.listOfColumnsFromDB}"  var="column" columnIndexVar="colIndex">  
  <f:facet name="header"> #{column}</f:facet>
  <h:outputText value="#{yourManagedBean.values[colIndex]}" />
</p:columns>

根据您的评论，我认为添加commandbutton或outputlink非常明显(而不是outputText):

Base on your comment, I think adding commandbutton or outputlink is very obvious (instead of the outputText):

<h:commandButton value="#{yourManagedBean.values[colIndex]}" action="#{yourManagedBean.someActionThatTakesAParam(colIndex)}" rendered="#{colIndex == 4}"/>

假设您希望在第5列中使用commandButton.

Supposing you want commandButton in column 5.

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