h:dataTable 复合组件，cc.attrs.var，IllegalArgumentException [英] h:dataTable composite component, cc.attrs.var, IllegalArgumentException

问题描述

我正在尝试像 primefaces 一样创建自己的数据表.问题是 cc.attrs.var 在使用时会抛出 IllegalArgumentException.所以我想知道如何拥有像 Primefaces 这样的 var 属性.

I'm trying to create my own dataTable like the primefaces one. The problem is that cc.attrs.var when used throws a IllegalArgumentException. So I'm wondering how I can have the var attribute like Primefaces.

<cc:interface>
    <cc:attribute name="value"/>
    <cc:attribute name="var"/>
    <cc:attribute name="styleClass"/>
</cc:interface>

<cc:implementation>

    <div>Previous</div>
    <div>Next</div>

    <h:dataTable value="#{cc.attrs.value}" var="#{cc.attrs.var}" styleClass="#{cc.attrs.styleClass}">
        <ui:insert/>
    </h:dataTable>

</cc:implementation>

推荐答案

根据 UIData#setValueExpression() javadoc，不允许有 EL 表达式var 属性.

抛出:IllegalArgumentException - 如果 name 是 id、parent、var 或 rowIndex

Throws: IllegalArgumentException - if name is one of id, parent, var, or rowIndex

最好的办法是创建一个支持组件，您可以在其中手动评估和设置 UIData 组件在 期间绑定到 >postAddToView 事件.

Your best bet is to create a backing component wherein you manually evaluate and set the var attribute of the UIData component bound to <h:dataTable> during the postAddToView event.

<cc:interface componentType="yourTableComposite">
    <cc:attribute name="value" />
    <cc:attribute name="var" />
</cc:interface>
<cc:implementation>
    <f:event type="postAddToView" listener="#{cc.init}" />

    <h:dataTable binding="#{cc.table}" value="#{cc.attrs.value}">
        <cc:insertChildren />
    </h:dataTable>
</cc:implementation>

@FacesComponent("yourTableComposite")
public class YourTableComposite extends UINamingContainer {

    private UIData table;

    public void init() {
        table.setVar((String) getAttributes().get("var"));
    }

    public UIData getTable() {
        return table;
    }

    public void setTable(UIData table) {
        this.table = table;
    }

}

请注意，我将 固定为 . 只能在 / 中使用.

Note that I fixed the <ui:insert> to be <cc:insertChildren>. The <ui:insert> can only be used in <ui:composition>/<ui:decorate>.

• 根据提供的属性初始化一个复合组件
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