Enable/Disable Example

Location: examples/webapp/enable/

This example demonstrates the <enable> attribute for conditionally showing or hiding inputs based on other input values.

tool.xml (simplified)

<input>
  <choice id="model">
    <about><label>Model</label></about>
    <option><about><label>Drift-Diffusion</label></about><value>dd</value></option>
    <option><about><label>Boltzmann Transport</label></about><value>bte</value></option>
    <option><about><label>Quantum NEGF</label></about><value>negf</value></option>
    <default>Drift-Diffusion</default>
  </choice>

  <!-- Shown only when model == "dd" -->
  <group id="dd">
    <about>
      <label>Drift-Diffusion Options</label>
      <enable>input.choice(model) == "dd"</enable>
    </about>
    <boolean id="recomb">
      <about><label>Recombination Model</label></about>
      <default>off</default>
    </boolean>
    <!-- Shown only when recomb is on -->
    <number id="taun">
      <about>
        <label>Electron Lifetime</label>
        <enable>input.group(dd).boolean(recomb)</enable>
      </about>
      <default>1e-6</default>
    </number>
  </group>

  <!-- Shown only when model == "bte" -->
  <group id="bte">
    <about>
      <label>BTE Options</label>
      <enable>input.choice(model) == "bte"</enable>
    </about>
    <number id="temp">
      <about><label>Temperature</label></about>
      <units>K</units>
      <default>300K</default>
    </number>
    <!-- Always hidden -->
    <integer id="secret">
      <about>
        <label>Secret number</label>
        <enable>no</enable>
      </about>
      <default>7</default>
    </integer>
  </group>

  <!-- Value-based enable with unit comparison -->
  <group id="negf">
    <about>
      <label>Quantum Options</label>
      <enable>input.choice(model) == "negf"</enable>
    </about>
    <number id="tbe">
      <about><label>Tight-binding Energy</label></about>
      <units>eV</units>
      <default>3.12eV</default>
    </number>
    <number id="tau">
      <about>
        <label>High-energy lifetime</label>
        <enable>input.(negf).(tbe):eV &gt;= 3</enable>
      </about>
      <units>ns</units>
      <default>10ns</default>
    </number>
  </group>
</input>

Enable expression syntax

Expression	Meaning
input.choice(model) == "dd"	Exact value match
input.group(dd).boolean(recomb)	Boolean is true/on
input.(negf).(tbe):eV >= 3	Numeric comparison with unit
no	Always disabled/hidden

Running

rappture2web examples/webapp/enable/