add and save button functionality

public/js/text.js

@@ -43,15 +43,62 @@ function buildTree(nodes) {
     return roots;
 }
 
-function renderTree(nodes) {
+function renderTree(nodes, textId) {
     const ul = document.createElement('ul');
     nodes.forEach(node => {
         const li = document.createElement('li');
-        li.textContent = node.title;
+
+        const titleSpan = document.createElement('span');
+        titleSpan.textContent = node.title;
+        li.appendChild(titleSpan);
+
+        const addBtn = document.createElement('button');
+        addBtn.textContent = 'Add child';
+        addBtn.className = 'add-child';
+        addBtn.addEventListener('click', () => toggleAddForm(li, node.id, textId));
+        li.appendChild(addBtn);
+
         if (node.children.length > 0) {
-            li.appendChild(renderTree(node.children));
+            li.appendChild(renderTree(node.children, textId));
         }
+
         ul.appendChild(li);
     });
     return ul;
 }
+
+function toggleAddForm(li, parentNodeId, textId) {
+    const existing = li.querySelector('input.child-title');
+    if (existing) {
+        existing.remove();
+        li.querySelector('button.save-child').remove();
+        return;
+    }
+
+    const input = document.createElement('input');
+    input.type = 'text';
+    input.className = 'child-title';
+    input.placeholder = 'Node title';
+
+    const saveBtn = document.createElement('button');
+    saveBtn.textContent = 'Save';
+    saveBtn.className = 'save-child';
+    saveBtn.addEventListener('click', () => {
+        const title = input.value.trim();
+        if (!title) return;
+
+        fetch('/api/nodes', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ textId: parseInt(textId), title, parentNodeId }),
+        })
+            .then(res => {
+                if (!res.ok) throw new Error('Failed to create node');
+                return res.json();
+            })
+            .then(() => fetchAndRenderNodes(textId));
+    });
+
+    li.appendChild(input);
+    li.appendChild(saveBtn);
+}