Hi Luisa,
if you want to change the case of an input Field you can create or modify the Field Template of the unit. In this case you can prepare a Javascript function which takes in input the value of the current field and returns the same value in uppercase. This function can be called with the onkeyup event.
For example:
<html:text [%onkeyPressed()%] [% if (maxLength != "") { %]maxlength="[%= maxLength %]"[% } %] size="[%= inputSize %]" styleId="[%= htmlId %]" styleClass="[%=styleClass%]" property="[%=fieldProp%]" readonly="[%= readOnly%]"/>
You can set the onkeyup event and the this.value=this.value.toUpperCase(); function:
<html:text [%onkeyPressed()%] [% if (maxLength != "") { %]maxlength="[%= maxLength %]"[% } %] size="[%= inputSize %]" styleId="[%= htmlId %]" styleClass="[%=styleClass%]" property="[%=fieldProp%]" readonly="[%= readOnly%]" onkeyup="this.value=this.value.toUpperCase();"/>