fixed: riot/riot#3000

src/generators/template/checks.js

@@ -147,14 +147,23 @@ export function isTextNode(node) {
 }
 
 /**
- * True if the node parsed is the root one
+ * True if the node parsed any of the root nodes (each, tag bindings create root nodes as well...)
  * @param   {RiotParser.Node} node - riot parser node
  * @returns {boolean} true only for the root nodes
  */
 export function isRootNode(node) {
   return node.isRoot
 }
 
+/**
+ * True if the node parsed is the absolute root node (nested root nodes are not considered)
+ * @param   {RiotParser.Node} node - riot parser node
+ * @returns {boolean} true only for the root nodes
+ */
+export function isAbsoluteRootNode(node) {
+  return node.isRoot && !node.isNestedRoot
+}
+
 /**
  * True if the attribute parsed is of type spread one
  * @param   {RiotParser.Node} node - riot parser node

src/generators/template/expressions/attribute.js

@@ -13,6 +13,7 @@ import {
   simplePropertyNode,
 } from '../../../utils/custom-ast-nodes.js'
 import { builders } from '../../../utils/build-types.js'
+import { isAbsoluteRootNode, isSpreadAttribute } from '../checks.js'
 import { createAttributeEvaluationFunction } from '../utils.js'
 /**
  * Create a simple attribute expression
@@ -47,7 +48,7 @@ export default function createAttributeExpression(
           // Custom nodes can't handle boolean attrs
           // Riot.js will handle the bool attrs logic only on native html tags
           (!parentNode[IS_CUSTOM_NODE] &&
-            !isRootNode(parentNode) &&
+            !isAbsoluteRootNode(parentNode) &&
             !isSpread &&
             !!sourceNode[IS_BOOLEAN_ATTRIBUTE]),
       ),
@@ -62,5 +63,3 @@ export default function createAttributeExpression(
     ),
   ])
 }
-
-import { isRootNode, isSpreadAttribute } from '../checks.js'

src/generators/template/utils.js

@@ -434,6 +434,7 @@ export function createRootNode(node) {
 export function createNestedRootNode(node) {
   return {
     ...rootNodeFactory(node),
+    isNestedRoot: true,
     attributes: cleanAttributes(node),
   }
 }

test/generators/template.spec.js

@@ -439,6 +439,25 @@ describe('Generators - Template', () => {
       expect(expression[BINDING_IS_BOOLEAN_ATTRIBUTE]).to.be.equal(true)
     })
 
+    it('Known boolean attribute on a select node https://github.com/riot/riot/issues/3000', () => {
+      const source = `<my-tag>
+<select name="customer">
+    <option each={ customer in state.customers } value="{ customer.id }" selected="{ state.current.id === customer.id }">
+       { customer.name }
+    </option> 
+</select></my-tag>`
+      const { template } = parse(source)
+      const [, bindings] = builder(
+        createRootNode(template),
+        FAKE_SRC_FILE,
+        source,
+      )
+      const output = evaluateOutput(bindings[0])
+      const expression = output.template.bindingsData[0].expressions[2]
+
+      expect(expression[BINDING_IS_BOOLEAN_ATTRIBUTE]).to.be.equal(true)
+    })
+
     it('Spread attribute expression', () => {
       const source = '<li {...foo}></li>'
       const { template } = parse(source)