通過綁定獲取提交的值

Question

我想將所有網格面板存儲到一個數組列表中，以便我可以遍歷它們。但是，獲得的結果並不符合我的預期。使用Netbeans調試模式，我意識到無論添加到數組列表中的是哪個網格面板，它都與jsp綁定的值不同。

例如，（從調試模式）

Name     Type     Value 
gridPanel1    HtmlPanelGrid   #334 
. 
. 
gridPanels    ArrayList_   #323 
[0]      HtmlPanelGrid   #524 

的問題是，什麼是錯的？什麼是正確的方法來做到這一點？

JSP文件

<h:panelGrid binding="#{CreatePage.gridPanel1}" columns="10" id="gridPanel1" style="height: 100%" width="671"> 
    <webuijsf:label for="column_TF1" id="columnLabel1" text="Column 1: "/> 
    <webuijsf:textField binding="#{CreatePage.column_TF1}" id="column_TF1" valueChangeListenerExpression="#{CreatePage.column_TF1_processValueChange}"/> 
    <webuijsf:label for="dataDropDown1" id="dataLabel1" text="Data Type: "/> 
    <webuijsf:dropDown binding="#{CreatePage.dataDropDown1}" id="dataDropDown1" 
            items="#{CreatePage.dataDropDown1DefaultOptions.options}" 
            onChange="webui.suntheme4_2.common.timeoutSubmitForm(this.form, 'mainGridPanel:columnGridPanel:gridPanel1:dataDropDown1');" 
            selected="#{CreatePage.dataDropDown1DefaultOptions.selectedValue}" valueChangeListenerExpression="#{CreatePage.dataDropDown1_processValueChange}"/> 
    <webuijsf:textField binding="#{CreatePage.charValueTF1}" columns="5" id="charValueTF1" rendered="false"/> 
    <webuijsf:label for="pkDropDown1" id="pkLabel1" text="Primary Key: "/> 
    <webuijsf:dropDown binding="#{CreatePage.pkDropDown1}" id="pkDropDown1" 
            items="#{CreatePage.pkDropDown1DefaultOptions.options}" onChange="" selected="#{CreatePage.pkDropDown1DefaultOptions.selectedValue}"/> 
    <webuijsf:label for="nullableDropDown1" id="nullableLabel1" text="Nullable:"/> 
    <webuijsf:dropDown binding="#{CreatePage.nullableDropDown1}" id="nullableDropDown1" 
            items="#{CreatePage.pkDropDown1DefaultOptions.options}" onChange="" 
            selected="#{CreatePage.pkDropDown1DefaultOptions.selectedValue}" valueChangeListenerExpression="#{CreatePage.nullableDropDown1_processValueChange}"/> 
</h:panelGrid> 
<h:panelGrid binding="#{CreatePage.gridPanel2}" columns="10" id="gridPanel2" style="height: 100%" width="671"> 
    <webuijsf:label for="column_TF2" id="columnLabel2" text="Column 2: "/> 
    <webuijsf:textField binding="#{CreatePage.column_TF2}" id="column_TF2" valueChangeListenerExpression="#{CreatePage.column_TF2_processValueChange}"/> 
    <webuijsf:label for="dataDropDown2" id="dataLabel2" text="Data Type: "/> 
    <webuijsf:dropDown binding="#{CreatePage.dataDropDown2}" id="dataDropDown2" 
            items="#{CreatePage.dataDropDown1DefaultOptions.options}" 
            onChange="webui.suntheme4_2.common.timeoutSubmitForm(this.form, 'mainGridPanel:columnGridPanel:gridPanel2:dataDropDown2');" selected="#{CreatePage.dataDropDown1DefaultOptions.selectedValue}"/> 
    <webuijsf:textField binding="#{CreatePage.charValueTF2}" columns="5" id="charValueTF2" rendered="false"/> 
    <webuijsf:label for="pkDropDown2" id="pkLabel2" text="Primary Key: "/> 
    <webuijsf:dropDown binding="#{CreatePage.pkDropDown2}" id="pkDropDown2" 
            items="#{CreatePage.pkDropDown1DefaultOptions.options}" onChange="" selected="#{CreatePage.pkDropDown1DefaultOptions.selectedValue}"/> 
    <webuijsf:label for="nullableDropDown2" id="nullableLabel2" text="Nullable:"/> 
    <webuijsf:dropDown binding="#{CreatePage.nullableDropDown2}" id="nullableDropDown2" 
            items="#{CreatePage.pkDropDown1DefaultOptions.options}" onChange="" 
            selected="#{CreatePage.pkDropDown1DefaultOptions.selectedValue}" valueChangeListenerExpression="#{CreatePage.nullableDropDown1_processValueChange}"/> 
</h:panelGrid> 

的Java文件

List<HtmlPanelGrid> gridPanels = new ArrayList<HtmlPanelGrid>(); 

public HtmlPanelGrid getGridPanel1() { 
    return gridPanel1; 
} 

public void setGridPanel1(HtmlPanelGrid hpg) { 
    this.gridPanel1 = hpg; 
} 
private HtmlPanelGrid gridPanel2 = new HtmlPanelGrid(); 

public HtmlPanelGrid getGridPanel2() { 
    return gridPanel2; 
} 

public void setGridPanel2(HtmlPanelGrid hpg) { 
    this.gridPanel2 = hpg; 
} 
private HtmlPanelGrid gridPanel3 = new HtmlPanelGrid(); 

if (gridPanels.isEmpty()) { 
     gridPanels.add(gridPanel1); 
     gridPanels.add(gridPanel2); 
     gridPanels.add(gridPanel3); 
     gridPanels.add(gridPanel4); 
     gridPanels.add(gridPanel5); 
     gridPanels.add(gridPanel6); 
} 

for (int i = 0; i < gridPanels.size(); i++) { 
     TextField tempTF = (TextField) gridPanels.get(i).findComponent(("column_TF" + Integer.toString(i))); 

     // I always get null value 
     tempStr = (String) tempTF.getValue(); 
    } 

Answer 1

爲什麼我不斷收到空值是因爲我沒有得到來自正確的位置值的原因。

正確的代碼應該是

for (int i = 0; i < gridPanels.size(); i++) { 
    // first get() returns the gridPanel 
    // second get() returns the components within the gridPanel. 
    // In this case, 1 is the TextField 
    TextField tempTF = (TextField) gridPanels.get(i).getChildren().get(1); 

    tempStr = (String) tempTF.getValue(); 
}