如何找出在 VisualForce 的下一页上选择了哪些复选框? [英] How to find out which checkboxes have been selected on the next page in VisualForce?

问题描述

我有一个数据表，它遍历自定义对象并生成复选框.在第二页上，我想确定哪些复选框已被选中.

I have a data table which iterates through a custom object and generates checkboxes. On the second page, I want to determine which of these checkboxes have been selected.

在 VisualForce 页面中:

In the VisualForce page:

 Age <apex:inputText value="{!age}" id="age" />
 <apex:dataTable value="{!Areas}" var="a">
      <apex:column >
      <apex:inputCheckbox value="{!a.name}" /> <apex:outputText value="{!a.name}" />
      </apex:column>
  </apex:dataTable>

在控制器中:

 public String age {get; set; }
  public List<Area_Of_Interest__c> getAreas() {
      areas = [select id, name from Area_Of_Interest__c];
      return areas;
  }

在我的第二页上，我可以使用 {!age} 检索用户放入文本框age"中的值.如何检索已选中的复选框?

On my second page, I can retrieve the value that the user put in the textbox "age" by using {!age}. How Do I retrieve which checkboxes have been checked?

谢谢.

推荐答案

好吧，如果你想用 Javascript 来处理它，使用 Pavel 的方法，否则使用以下通过控制器来完成.您必须为要跟踪的任何内容创建一个包装类.我不确定它是如何工作的，但不知何故，如果您在包装类中将布尔变量命名为selected"，它会映射到复选框.代码如下:

Ok, if you want to handle it with Javascript, use Pavel's method, otherwise use the following to do it via the controller. You must create a wrapper class for whatever you wish to track. I'm not sure how it works, but somehow if you name a boolean variable "selected" in your wrapper class, it is mapped to the checkbox. Below is the code:

因此，在您的 Visual force 页面中，执行以下操作:

So in your Visual force page, do:

<apex:dataTable value="{!Foos}" var="f">
    <apex:column >
        <apex:outputLabel value="{!f.foo.name}" /> <apex:inputCheckbox value="{!f.selected}" />
    </apex:column>
 </apex:dataTable>
 <apex:commandButton action="{!getPage2}" value="go"/>

在您的控制器中，执行以下操作:1) 使用布尔值selected"创建一个 Wrapper 类，它以某种方式映射到所选的 inputCheckbox:

In your Controller, do the following: 1) Make a Wrapper class with the boolean "selected", which somehow maps to the inputCheckbox selected:

public class wFoo {
    public Foo__c foo {get; set}
    public boolean selected {get; set;}

    public wFoo(Foo__c foo) {
        this.foo = foo;
        selected = false; //If you want all checkboxes initially selected, set this to true
    }
}

2) 声明列表变量

public List<wFoo> foos {get; set;}
public List<Foo__c> selectedFoos {get; set;}

3) 定义列表的访问器

3) Define the accessor for the List

public List<wFoo> getFoos() {
    if (foos == null) {
        foos = new List<wFoo>();
        for (Foo__c foo : [select id, name from Foo__c]) {
            foos.add(new wFoo(foo));
        }
    }
    return foos;
}

4) 定义处理选中复选框的方法，并将它们放入一个列表中以供其他页面使用

4) Define the method to process the selected checkboxes and place them in a List for use on another page

public void processSelectedFoos() {
    selectedFoos = new List<Foo__c>();
    for (wFoo foo : getFoos) {
        if (foo.selected = true) {
            selectedFoos.add(foo.foo); // This adds the wrapper wFoo's real Foo__c
        }
    }
}

5) 定义点击提交按钮时返回PageReference到下一页的方法

5) Define the method to return the PageReference to the next page when the submit button is clicked

public PageReference getPage2() {
    processSelectedFoos();
    return Page.Page2;
}

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