customValidation not work on blank field

[yisuren]

hi,
I am user smartgwt 3.0p

I try to do some validation on dynamicform field.
It's a requiredIf check and I want it work both on client and server side,
so I need to define the validation in datasource and I search the forum got that the best way is to use customValidation in smartgwt.
My case is this : when field [url] got input, [landing_url] should be required="true", but I found when I leave [landing_url] blank the validation will not be called.

Anyhelp will be appreciate.

My code

    <field name="url" type="text" length="255" />
    <field name="landing_url" type="text" length="255">
      <validators>
        <validator type="serverCustom">
          <serverCondition>#if(!$record.url.equals("") &amp;&amp; $value.equals("")) false #else true #end</serverCondition>
        </validator>
      </validators>
    </field>

[yisuren]

somebody help?

[yisuren1]

somebody help?