Runtime tools : Channels components : HTML Channel : Tasks : Performing validation : Performing data field validation
  
Performing data field validation
Each typed data field must define its required syntactic validation in the dsetype.xml file.
You can also use the validation process in the startup sequence by passing data through the request to the CSEstablishSessionServlet. The startup operation may define its typed data elements with the same validators.
For an example of how data field validation works on a data field with the "Amount" data type, see the following in the HTML Sample Application:
accountTransferData.amount data field in accountTransferOp.xml
Amount type in dsetype.xml
com.ibm.btt.samples.html.AmountValidator class
<dse:text dataName="amount" error="yes" size="10" maxLength="10"/> in transfer.jsp
<dse:error dataName="amount"/> in transfer.jsp
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Performing validation