理解XForm——学习IBM DW的资料 (4)

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>