理解XForm——学习IBM DW的资料 (4)

答案：1、动态改变表单的字段

如增加、删除或修改表单的一个或一些字段，通过 XForm的Trigger元素中嵌入delete、add、setvalue属性来实现：

<xforms:trigger>   
  <xforms:label>Remove current item</xforms:label>   
  <xforms:delete event="xforms-activate" nodeset="order/soaps/item"      
            at="index('soaplist')"/>   
</xforms:trigger>
<xforms:trigger>   
  <xforms:label>Add an item</xforms:label>   
  <xforms:action event="xforms-activate">   
    <xforms:insert nodeset="order/soaps/item" at="index('soaplist')"
            position="after"/>   
    <xforms:setvalue ref="order/soaps/item[index('soaplist')]/
            qty">0</xforms:setvalue>

    <xforms:setvalue ref="order/soaps/item[index('soaplist')]/
            flavor">P</xforms:setvalue>  
    <xforms:setvalue   
            ref="order/soaps/item[index('soaplist')]/
                unitprice">2.50</xforms:setvalue>  
    <xforms:setvalue   
            ref="order/soaps/item[index('soaplist')]/
                totalprice">0.00</xforms:setvalue>  
  </xforms:action>   
</xforms:trigger>   

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