Field Validator that checks if a conversion error occurred for this field.
fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required.<!-- Plain Validator Syntax -->
<validator type="conversion">
<param name="fieldName">myField</param>
<message>Conversion Error Occurred</message>
</validator>
<!-- Field Validator Syntax -->
<field name="myField">
<field-validator type="conversion">
<message>Conversion Error Occurred</message>
</field-validator>
</field>
The capability of auto-repopulating the stack with a fake parameter map when a conversion error has occurred can be done with repopulateField property set to true.
This is typically useful when one wants to repopulate the field with the original value when a conversion error occurred. Eg. with a textfield that only allows an Integer (the action class have an Integer field declared), upon conversion error, the incorrectly entered integer (maybe a text ‘one’) will not appear when dispatched back. With repopulateField property set to true, it will, meaning the textfield will have ‘one’ as its value upon conversion error.
<!-- myJspPage.jsp --> <s:form action="someAction" method="POST"> .... <s:textfield label="My Integer Field" name="myIntegerField" /> .... <s:submit /> </s:form>
<!-- xwork.xml -->
<xwork>
<include file="xwork-default.xml" />
....
<package name="myPackage" extends="xwork-default">
....
<action name="someAction" class="example.MyActionSupport.java">
<result name="input">myJspPage.jsp</result>
<result>success.jsp</result>
</action>
....
</package>
....
</xwork>
<!-- MyActionSupport.java -->
public class MyActionSupport extends ActionSupport {
private Integer myIntegerField;
public Integer getMyIntegerField() { return this.myIntegerField; }
public void setMyIntegerField(Integer myIntegerField) {
this.myIntegerField = myIntegerField;
}
}
<!-- MyActionSupport-someAction-validation.xml -->
<validators>
...
<field name="myIntegerField">
<field-validator type="conversion">
<param name="repopulateField">true</param>
<message>Conversion Error (Integer Wanted)</message>
</field-validator>
</field>
...
</validators>