我使用的是Orbeon Forms CE版本orbeon-4.0.0.M11.201210030654-CE。
我有一个包含多个实例的XForm（XHTML），我在其中一个实例上使用required =“true（）”进行绑定，并使用xxforms-invalid＆amp; xxforms - 有效切换案例。以下是我的xform中的一些代码示例。
<xforms:instance id="teaching-load-instance" src="oxf:/apps/uis-common/model/uis-teaching-load-xforms-instance.xml"/>
<xforms:bind nodeset="instance('teaching-load-instance')/teaching_load">
<xforms:bind nodeset="module_id" required="true()"/>
</xforms:bind>
<xforms:action ev:event="xxforms-invalid" ev:observer="teaching-load-instance">
<xforms:toggle case="invalid-form-case"/>
</xforms:action>
<xforms:action ev:event="xxforms-valid" ev:observer="teaching-load-instance">
<xforms:toggle case="valid-form-case"/>
</xforms:action>
访问此xform页面时，将抛出stackoverflow错误。
以下是orbeon.log文件的调试日志。
2012-10-23 21:42:42,470 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "month-instance"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,470 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "verification-instance"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,470 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,470 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "modules-instance"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,471 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - end dispatching {time (ms): "1"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start dispatching {name: "xxforms-invalid", target: "teaching-load-instance"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start handler {name: "xxforms-invalid", phase: "target", observer: "teaching-load-instance"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:action"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:toggle"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start dispatching {name: "xforms-revalidate", target: "xf-2"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,471 DEBUG XFormsServer - validation - start performing revalidate {model id: "xf-2"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "triggers-instance"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,471 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,471 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "parameters-instance"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end dispatching {time (ms): "1"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "check-user-instance"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "main"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "temp"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "session"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,472 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "status-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end dispatching {time (ms): "1"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "month-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "verification-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "modules-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start dispatching {name: "xxforms-invalid", target: "teaching-load-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - start handler {name: "xxforms-invalid", phase: "target", observer: "teaching-load-instance"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:action"}
2012-10-23 21:42:42,473 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:toggle"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start dispatching {name: "xforms-revalidate", target: "xf-2"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,474 DEBUG XFormsServer - validation - start performing revalidate {model id: "xf-2"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "triggers-instance"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,474 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "parameters-instance"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,474 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "check-user-instance"}
2012-10-23 21:42:42,474 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,474 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end dispatching {time (ms): "1"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "main"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "temp"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "session"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "status-instance"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,475 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "month-instance"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end dispatching {time (ms): "1"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "verification-instance"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "modules-instance"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start dispatching {name: "xxforms-invalid", target: "teaching-load-instance"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - start handler {name: "xxforms-invalid", phase: "target", observer: "teaching-load-instance"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:action"}
2012-10-23 21:42:42,476 DEBUG XFormsServer - interpreter - start executing {action name: "xforms:toggle"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start dispatching {name: "xforms-revalidate", target: "xf-2"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,477 DEBUG XFormsServer - validation - start performing revalidate {model id: "xf-2"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "triggers-instance"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,477 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - end dispatching {time (ms): "0"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start dispatching {name: "xxforms-valid", target: "parameters-instance"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - start performing default action {}
2012-10-23 21:42:42,477 DEBUG XFormsServer - end performing default action {time (ms): "0"}
2012-10-23 21:42:42,477 DEBUG XFormsServer - end dispatching {time (ms): "0"}
答案 0 :(得分：1)
您可以在XForms中创建无限循环，但在这种情况下，您似乎遇到了XForms引擎中的错误。如果案例没有改变，xf:toggle应该没有效果。我为此填写an issue，您可以跟踪。
自Orbeon Forms 4.0 M13以来，此问题已得到解决。对于早期版本，您可以在if上添加xf:toggle来解决此问题。假设您的交换机ID为my-switch：
<xforms:toggle if="xxforms:case('my-switch') != 'invalid-form-case'"
case="invalid-form-case"/>
加上另一个if的等效<xforms:toggle case="valid-form-case"/>。