How to give a default value to an <eval token> calculated in <input> tag in my XML dashboard?

[piece]

My input tag looks like this

</input>
    <input type="multiselect" token="fruit_name">
      <label>Fruit name</label>
      <choice value="*">All</choice>
      <default>*</default>
      <initialValue>*</initialValue>
      <fieldForLabel>fruit_name</fieldForLabel>
      <fieldForValue>fruit_name</fieldForValue>
      <search>
        <query>index=splunk query | mvexpand fruit_name
        </query>
      </search>
      <delimiter> </delimiter>
      <change>
        <eval token="fruit">
          <expression>if(isnull($fruit_name$), "//*", $fruit_name$)</expression>
          <default>*</default>
        </eval>
      </change>
    </input>

I use `fruit` later in a panel in the XML dashboard. The issue is if user doesn’t select anything from the drop down, `fruit_name` still holds value '*' but the panel which uses `fruit` just shows a message `Search is waiting for input...`. How can I make sure that when user doesn’t select anything, along with `fruit_name` `fruit` also holds the default value which is '*'. Please help.

[ITWhisperer · Accepted solution]

Try it this way

        <eval token="fruit">if(isnull($fruit_name$), "//*", $fruit_name$)</eval>