有没有办法检查控制值是否有效（如果需要值，该值是否有效）？我尝试过使用xf:valid和xxf:valid，但没有一个像我预期的那样工作（似乎必须更改另一个不相关的控件来重做计算值。
2016.2表单构建器示例表单 - 一旦更改control-5的值，电子邮件有效值就更正。
<xh:html xmlns:xh="http://www.w3.org/1999/xhtml" xmlns:xf="http://www.w3.org/2002/xforms"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ev="http://www.w3.org/2001/xml-events"
xmlns:xi="http://www.w3.org/2001/XInclude"
xmlns:xxi="http://orbeon.org/oxf/xml/xinclude"
xmlns:xxf="http://orbeon.org/oxf/xml/xforms"
xmlns:exf="http://www.exforms.org/exf/1-0"
xmlns:fr="http://orbeon.org/oxf/xml/form-runner"
xmlns:saxon="http://saxon.sf.net/"
xmlns:sql="http://orbeon.org/oxf/xml/sql"
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:fb="http://orbeon.org/oxf/xml/form-builder">
<xh:head>
<xh:title>Untitled Form</xh:title>
<xf:model id="fr-form-model" xxf:expose-xpath-types="true">
<!-- Main instance -->
<xf:instance id="fr-form-instance" xxf:exclude-result-prefixes="#all" xxf:index="id">
<form>
<section-1>
<email-required/>
<email/>
<email-valid/>
<control-5/>
</section-1>
</form>
</xf:instance>
<!-- Bindings -->
<xf:bind id="fr-form-binds" ref="instance('fr-form-instance')">
<xf:bind id="section-1-bind" name="section-1" ref="section-1">
<xf:bind id="email-required-bind" name="email-required" ref="email-required"
xxf:whitespace="trim"/>
<xf:bind id="email-bind" ref="email" name="email" type="xf:email" xxf:whitespace="trim"
required="//email-required ne ''"/>
<xf:bind id="email-valid-bind" ref="email-valid" name="email-valid"
calculate="if (xxf:valid(//email)) then 'good' else 'bad'"/>
<xf:bind id="control-5-bind" ref="control-5" name="control-5" xxf:whitespace="trim"/>
</xf:bind>
</xf:bind>
<!-- Metadata -->
<xf:instance xxf:readonly="true" id="fr-form-metadata" xxf:exclude-result-prefixes="#all">
<metadata>
<application-name>TEST</application-name>
<form-name>TEST</form-name>
<title xml:lang="en">Untitled Form</title>
<description xml:lang="en"/>
</metadata>
</xf:instance>
<!-- Attachments -->
<xf:instance id="fr-form-attachments" xxf:exclude-result-prefixes="#all">
<attachments>
<css mediatype="text/css" filename="" size=""/>
<pdf mediatype="application/pdf" filename="" size=""/>
</attachments>
</xf:instance>
<!-- All form resources -->
<xf:instance xxf:readonly="true" id="fr-form-resources" xxf:exclude-result-prefixes="#all">
<resources>
<resource xml:lang="en">
<section-1>
<label>Untitled Section</label>
</section-1>
<email-required>
<label>Email Required?</label>
<hint/>
</email-required>
<email>
<label>Emal</label>
<hint/>
</email>
<email-valid>
<label>Email Valid</label>
<hint/>
</email-valid>
<control-5>
<label>Random Field</label>
<hint/>
</control-5>
</resource>
</resources>
</xf:instance>
<!-- Utility instances for services -->
<xf:instance id="fr-service-request-instance" xxf:exclude-result-prefixes="#all">
<request/>
</xf:instance>
<xf:instance id="fr-service-response-instance" xxf:exclude-result-prefixes="#all">
<response/>
</xf:instance>
</xf:model>
</xh:head>
<xh:body>
<fr:view>
<fr:body xmlns:xbl="http://www.w3.org/ns/xbl" xmlns:p="http://www.orbeon.com/oxf/pipeline"
xmlns:oxf="http://www.orbeon.com/oxf/processors">
<fr:section id="section-1-control" bind="section-1-bind">
<xf:label ref="$form-resources/section-1/label"/>
<fr:grid>
<xh:tr>
<xh:td>
<xf:input id="email-required-control" bind="email-required-bind">
<xf:label ref="$form-resources/email-required/label"/>
<xf:hint ref="$form-resources/email-required/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:input>
</xh:td>
<xh:td>
<xf:input id="email-control" bind="email-bind">
<xf:label ref="$form-resources/email/label"/>
<xf:hint ref="$form-resources/email/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:input>
</xh:td>
</xh:tr>
<xh:tr>
<xh:td>
<xf:output id="email-valid-control" bind="email-valid-bind">
<xf:label ref="$form-resources/email-valid/label"/>
<xf:hint ref="$form-resources/email-valid/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:output>
</xh:td>
<xh:td>
<xf:input id="control-5-control" bind="control-5-bind">
<xf:label ref="$form-resources/control-5/label"/>
<xf:hint ref="$form-resources/control-5/hint"/>
<xf:alert ref="$fr-resources/detail/labels/alert"/>
</xf:input>
</xh:td>
</xh:tr>
</fr:grid>
</fr:section>
</fr:body>
</fr:view>
</xh:body>
</xh:html>
答案 0 :(得分：0)
发生这种情况的原因是XForms中的处理模型：
因此，如果您根据验证进行计算，您可以进入您所看到的那种循环，即事情不会按照您期望的顺序发生。这可能可以通过更微妙的依赖算法来解决（另请参阅此RFE），但目前这是必须发生的事情。
在这些情况下，您可以使用以下操作：
<xf:setvalue
observer="email-valid-control"
event="xforms-valid"
ref="bind('email-valid-bind')"
value="true()"/>
<xf:setvalue
observer="email-valid-control"
event="xforms-invalid"
ref="bind('email-valid-bind')"
value="false()"/>
这个比较重，需要你使用custom model logic，但这是目前唯一可靠的方法。