add anchors to table of contents (wip)

docs/src/demos/Guide/NodeViews/TableOfContents/Component.vue

@@ -7,7 +7,9 @@
         v-for="(heading, index) in headings"
         :key="index"
       >
+        <a :href="`#${heading.id}`">
           {{ heading.text }}
+        </a>
       </li>
     </ul>
   </node-view-wrapper>
@@ -38,17 +40,41 @@ export default {
     handleUpdate() {
       const headings = []
 
-      this.editor.state.doc.descendants(node => {
+      this.editor.state.doc.descendants((node, pos) => {
         if (node.type.name === 'heading') {
+          const id = `heading-${headings.length + 1}`
+
+          if (node.attrs.id !== id) {
+            this.updateNodeAttributes(node, pos, {
+              id,
+            })
+          }
+
           headings.push({
             level: node.attrs.level,
             text: node.textContent,
+            id,
           })
         }
       })
 
       this.headings = headings
     },
+    updateNodeAttributes(node, pos, attributes) {
+      const { state } = this.editor.view
+      const transaction = state.tr.setNodeMarkup(pos, undefined, {
+        ...node.attrs,
+        ...attributes,
+      })
+
+      console.log(pos, undefined, {
+        ...node.attrs,
+        ...attributes,
+      })
+
+      // TODO: Why is that not needed? 🤔
+      this.editor.view.dispatch(transaction)
+    },
   },
 
   mounted() {
@@ -58,10 +84,6 @@ export default {
 }
 </script>
 
-<style>
-
-</style>
-
 <style lang="scss">
 /* Basic editor styles */
 .ProseMirror {
@@ -84,7 +106,7 @@ export default {
 
     &::before {
       display: block;
-      content: "In this document";
+      content: "Table of Contents";
       font-weight: 700;
       letter-spacing: 0.025rem;
       font-size: 0.75rem;
@@ -94,6 +116,10 @@ export default {
   }
 
   &__item {
+    a:hover {
+      opacity: 0.5;
+    }
+
     &--3 {
       padding-left: 1rem;
     }

docs/src/demos/Guide/NodeViews/TableOfContents/TableOfContents.js

@@ -24,4 +24,19 @@ export default Node.create({
   addNodeView() {
     return VueNodeViewRenderer(Component)
   },
+
+  addGlobalAttributes() {
+    return [
+      {
+        types: [
+          'heading',
+        ],
+        attributes: {
+          id: {
+            default: null,
+          },
+        },
+      },
+    ]
+  },
 })

docs/src/demos/Guide/NodeViews/TableOfContents/index.vue

@@ -27,7 +27,6 @@ export default {
         TableOfContents,
       ],
       content: `
-        <toc></toc>
         <h2>1 heading</h2>
         <p>paragraph</p>
         <h3>1.1 heading</h3>
@@ -38,6 +37,7 @@ export default {
         <p>paragraph</p>
         <h3>2.1 heading</h3>
         <p>paragraph</p>
+        <toc></toc>
       `,
     })
   },