用于检查控件值是否有效的 XPath

Question

有没有一种方法可以检查控制值是否有效（如果需要则存在一个值并且该值有效）？我曾尝试使用 xf:valid and xxf:valid，但 none 按我的预期工作（似乎必须更改另一个不相关的控件才能重做计算值。

2016.2 表单生成器示例表单 - 更改 control-5 的值后电子邮件有效值正确。

<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>

Answer 1

发生这种情况的原因是 XForms 中的处理模型：

首先，更新并重新计算数据。
其次，数据重新验证。

因此，如果您根据验证进行计算，就会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），但目前这是事情必须发生的方式。

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，需要您使用 custom model logic，但这是目前唯一可靠的方法。

用于检查控件值是否有效的 XPath

XPath to check if control value valid

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