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Select boxes are HTML controls of the form of 
<select></select>

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Binding to a Process Variable

A select box can be bound to a process variable using the cam-variable-name directive: 
<select cam-variable-name="foo"
        cam-variable-type="String">
  <option>bar</option>
  <option>zar</option>
</select>

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Supported Variable Types

The select box supports the same value types as <input type="text">.

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Populating the Options from a Variable

The <option> entries can be populated using a variable. The name of the variable can be provided using the cam-choices directive: 
<select cam-variable-name="PRODUCT_TYPE"
        cam-variable-type="String"
        cam-choices="AVAILABLE_PRODUCT_TYPES">
</select>
The directive cam-choices expects the values to be a List or Map (Object). In case of a Map (Object), the keys of the map are used as values of the options. java.util.Map and java.util.List are supported but must be serialized as JSON: 
Map<String, String> productTypes = new HashMap<String, String>();
productTypes.put("001", "Notebook");
productTypes.put("002", "Server");
productTypes.put("003", "Workstation");

execution.setVariable("AVAILABLE_PRODUCT_TYPES",  Spin.JSON(productTypes));
Would be rendered as 
<select cam-variable-name="PRODUCT_TYPE"
        cam-variable-type="String"
        cam-choices="AVAILABLE_PRODUCT_TYPES">
  <option value="001">Notebook</option>
  <option value="002">Server</option>
  <option value="003">Workstation</option>
</select>