I can edit a cell

.claude/commands/developer-control.md

@@ -205,7 +205,7 @@ def render(self):
     return Div(
         self._mk_content(),
         Keyboard(self, _id="-keyboard").add("esc", self.commands.close()),
-        Mouse(self, _id="-mouse").add("click", self.commands.on_click()),
+        Mouse(self, _id="-mouse").add("click", self.commands.handle_on_click()),
         id=self._id
     )
 ```

.claude/skills/developer-control/SKILL.md

@@ -209,13 +209,14 @@ For interactive controls, compose `Keyboard` and `Mouse`:
 from myfasthtml.controls.Keyboard import Keyboard
 from myfasthtml.controls.Mouse import Mouse
 
+
 def render(self):
-    return Div(
+  return Div(
-        self._mk_content(),
+    self._mk_content(),
-        Keyboard(self, _id="-keyboard").add("esc", self.commands.close()),
+    Keyboard(self, _id="-keyboard").add("esc", self.commands.close()),
-        Mouse(self, _id="-mouse").add("click", self.commands.on_click()),
+    Mouse(self, _id="-mouse").add("click", self.commands.handle_on_click()),
-        id=self._id
+    id=self._id
-    )
+  )
 ```
 
 ---

src/myfasthtml/assets/core/mouse.js

@@ -14,6 +14,7 @@
     pendingMatches: [], // Array of matches waiting for timeout
     sequenceTimeout: 500, // 500ms timeout for sequences
     clickHandler: null,
+    dblclickHandler: null,      // Handler reference for dblclick
     contextmenuHandler: null,
     mousedownState: null,       // Active drag state (only after movement detected)
     suppressNextClick: false,   // Prevents click from firing after mousedown>mouseup
@@ -35,7 +36,9 @@
 
     // Handle aliases
     const aliasMap = {
-      'rclick': 'right_click'
+      'rclick': 'right_click',
+      'double_click': 'dblclick',
+      'dclick': 'dblclick'
     };
 
     return aliasMap[normalized] || normalized;
@@ -563,6 +566,43 @@
     }
   }
 
+  /**
+   * Handle dblclick events (triggers for all registered elements).
+   * Uses a fresh single-step history so it never conflicts with click sequences.
+   * @param {MouseEvent} event - The dblclick event
+   */
+  function handleDblClick(event) {
+    const snapshot = createSnapshot(event, 'dblclick');
+    const dblclickHistory = [snapshot];
+
+    const currentMatches = [];
+
+    for (const [elementId, data] of MouseRegistry.elements) {
+      const element = document.getElementById(elementId);
+      if (!element) continue;
+
+      const isInside = element.contains(event.target);
+      const currentNode = traverseTree(data.tree, dblclickHistory);
+      if (!currentNode || !currentNode.config) continue;
+
+      currentMatches.push({
+        elementId: elementId,
+        config: currentNode.config,
+        combinationStr: currentNode.combinationStr,
+        isInside: isInside
+      });
+    }
+
+    const anyMatchInside = currentMatches.some(m => m.isInside);
+    if (anyMatchInside && !isInInputContext()) {
+      event.preventDefault();
+    }
+
+    for (const match of currentMatches) {
+      triggerHtmxAction(match.elementId, match.config, match.combinationStr, match.isInside, event);
+    }
+  }
+
   /**
    * Clean up mousedown state and safety timeout
    */
@@ -989,11 +1029,13 @@
     if (!MouseRegistry.listenerAttached) {
       // Store handler references for proper removal
       MouseRegistry.clickHandler = (e) => handleMouseEvent(e, 'click');
+      MouseRegistry.dblclickHandler = (e) => handleDblClick(e);
       MouseRegistry.contextmenuHandler = (e) => handleMouseEvent(e, 'right_click');
       MouseRegistry.mousedownHandler = (e) => handleMouseDown(e);
       MouseRegistry.mouseupHandler = (e) => handleMouseUp(e);
 
       document.addEventListener('click', MouseRegistry.clickHandler);
+      document.addEventListener('dblclick', MouseRegistry.dblclickHandler);
       document.addEventListener('contextmenu', MouseRegistry.contextmenuHandler);
       document.addEventListener('mousedown', MouseRegistry.mousedownHandler);
       document.addEventListener('mouseup', MouseRegistry.mouseupHandler);
@@ -1007,6 +1049,7 @@
   function detachGlobalListener() {
     if (MouseRegistry.listenerAttached) {
       document.removeEventListener('click', MouseRegistry.clickHandler);
+      document.removeEventListener('dblclick', MouseRegistry.dblclickHandler);
       document.removeEventListener('contextmenu', MouseRegistry.contextmenuHandler);
       document.removeEventListener('mousedown', MouseRegistry.mousedownHandler);
       document.removeEventListener('mouseup', MouseRegistry.mouseupHandler);
@@ -1014,6 +1057,7 @@
 
       // Clean up handler references
       MouseRegistry.clickHandler = null;
+      MouseRegistry.dblclickHandler = null;
       MouseRegistry.contextmenuHandler = null;
       MouseRegistry.mousedownHandler = null;
       MouseRegistry.mouseupHandler = null;

src/myfasthtml/assets/datagrid/datagrid.js

@@ -3,7 +3,7 @@ function initDataGrid(gridId) {
   initDataGridMouseOver(gridId);
   makeDatagridColumnsResizable(gridId);
   makeDatagridColumnsMovable(gridId);
-  updateDatagridSelection(gridId)
+  updateDatagridSelection(gridId);
 }
 
 /**

src/myfasthtml/controls/DataGrid.py

@@ -1,7 +1,6 @@
 import html
 import logging
 import re
-from dataclasses import dataclass
 from functools import lru_cache
 from typing import Optional
 
@@ -18,9 +17,7 @@ from myfasthtml.controls.Keyboard import Keyboard
 from myfasthtml.controls.Mouse import Mouse
 from myfasthtml.controls.Panel import Panel, PanelConf
 from myfasthtml.controls.Query import Query, QUERY_FILTER
-from myfasthtml.controls.datagrid_objects import DataGridColumnState, DataGridRowUiState, \
+from myfasthtml.controls.datagrid_objects import *
-  DatagridSelectionState, DataGridHeaderFooterConf, DatagridEditionState, DataGridColumnUiState, \
-  DataGridRowSelectionColumnState
 from myfasthtml.controls.helpers import mk
 from myfasthtml.core.commands import Command
 from myfasthtml.core.constants import ColumnType, FooterAggregation, DATAGRID_PAGE_SIZE, FILTER_INPUT_CID
@@ -156,7 +153,7 @@ class Commands(BaseCommands):
     return Command("OnClick",
                    "Click on the table",
                    self._owner,
-                   self._owner.on_click
+                   self._owner.handle_on_click
                    ).htmx(target=f"#tsm_{self._id}")
   
   def on_key_pressed(self):
@@ -213,6 +210,21 @@ class Commands(BaseCommands):
                    self._owner.on_column_changed
                    )
   
+  def start_edition(self):
+    return Command("StartEdition",
+                   "Enter cell edit mode",
+                   self._owner,
+                   self._owner.handle_start_edition
+                   ).htmx(target=f"#tsm_{self._id}")
+  
+  def save_edition(self):
+    return Command("SaveEdition",
+                   "Save cell edition",
+                   self._owner,
+                   self._owner.handle_save_edition
+                   ).htmx(target=f"#tsm_{self._id}",
+                          trigger="blur, keydown[key=='Enter']")
+
 
 class DataGrid(MultipleInstance):
   def __init__(self, parent, conf=None, save_state=None, _id=None):
@@ -293,10 +305,12 @@ class DataGrid(MultipleInstance):
         "click": {"command": self.commands.on_click(), "hx_vals": "js:getCellId()"},
         "ctrl+click": {"command": self.commands.on_click(), "hx_vals": "js:getCellId()"},
         "shift+click": {"command": self.commands.on_click(), "hx_vals": "js:getCellId()"},
+        "dblclick": {"command": self.commands.start_edition(), "hx_vals": "js:getCellId()"},
     }
     
     self._key_support = {
         "esc": {"command": self.commands.on_key_pressed(), "require_inside": False},
+        "enter": {"command": self.commands.on_key_pressed(), "require_inside": True},
     }
     
     logger.debug(f"DataGrid '{self.get_table_name()}' with id='{self._id}' created.")
@@ -451,6 +465,26 @@ class DataGrid(MultipleInstance):
     if self._settings.enable_edition:
       self._columns.insert(0, DataGridRowSelectionColumnState())
   
+  def _enter_edition(self, pos):
+    col_pos, row_index = pos
+    col_def = self._columns[col_pos]
+    if col_def.type in (ColumnType.RowSelection_, ColumnType.RowIndex, ColumnType.Formula):
+      return self.render_partial()
+    self._state.edition.under_edition = pos
+    self._state.save()
+    return self.render_partial("cell", pos=pos)
+  
+  def _convert_edition_value(self, value_str, col_type):
+    if col_type == ColumnType.Number:
+      try:
+        return float(value_str) if '.' in value_str else int(value_str)
+      except (ValueError, TypeError):
+        return value_str
+    elif col_type == ColumnType.Bool:
+      return value_str.lower() in ('true', '1', 'yes')
+    else:
+      return value_str
+  
   def add_new_column(self, col_def: DataGridColumnState) -> None:
     """Add a new column, delegating data mutation to DataService.
 
@@ -571,14 +605,20 @@ class DataGrid(MultipleInstance):
     self._state.filtered[FILTER_INPUT_CID] = self._datagrid_filter.get_query()
     return self.render_partial("body")
   
-  def on_click(self, combination, is_inside, cell_id):
+  def handle_on_click(self, combination, is_inside, cell_id):
     logger.debug(f"on_click table={self.get_table_name()} {combination=} {is_inside=} {cell_id=}")
     if is_inside and cell_id:
       self._state.selection.extra_selected.clear()
       
-      if cell_id.startswith("tcell_"):
+      pos = self._get_pos_from_element_id(cell_id)
-        pos = self._get_pos_from_element_id(cell_id)
+      
-        self._update_current_position(pos)
+      if (self._settings.enable_edition and
+          pos is not None and
+          pos == self._state.selection.selected and
+          self._state.edition.under_edition is None):
+        return self._enter_edition(pos)
+      
+      self._update_current_position(pos)
     
     return self.render_partial()
   
@@ -605,6 +645,11 @@ class DataGrid(MultipleInstance):
     if combination == "esc":
       self._update_current_position(None)
       self._state.selection.extra_selected.clear()
+    elif (combination == "enter" and
+          self._settings.enable_edition and
+          self._state.selection.selected and
+          self._state.edition.under_edition is None):
+      return self._enter_edition(self._state.selection.selected)
     
     return self.render_partial()
   
@@ -674,6 +719,30 @@ class DataGrid(MultipleInstance):
     self._panel.set_title(side="right", title="Formatting")
     self._panel.set_right(self._formatting_editor)
   
+  def handle_start_edition(self, cell_id):
+    logger.debug(f"handle_start_edition: {cell_id=}")
+    if not self._settings.enable_edition:
+      return self.render_partial()
+    if self._state.edition.under_edition is not None:
+      return self.render_partial()
+    pos = self._get_pos_from_element_id(cell_id)
+    if pos is None:
+      return self.render_partial()
+    self._update_current_position(pos)
+    return self._enter_edition(pos)
+  
+  def handle_save_edition(self, value):
+    logger.debug(f"handle_save_edition: {value=}")
+    if self._state.edition.under_edition is None:
+      return self.render_partial()
+    col_pos, row_index = self._state.edition.under_edition
+    col_def = self._columns[col_pos]
+    typed_value = self._convert_edition_value(value, col_def.type)
+    self._data_service.set_data(col_def.col_id, row_index, typed_value)
+    self._state.edition.under_edition = None
+    self._state.save()
+    return self.render_partial("cell", pos=(col_pos, row_index))
+  
   def handle_set_column_width(self, col_id: str, width: str):
     """Update column width after resize. Called via Command from JS."""
     logger.debug(f"set_column_width: {col_id=} {width=}")
@@ -724,6 +793,31 @@ class DataGrid(MultipleInstance):
   def get_data_service_id_from_data_grid_id(datagrid_id):
     return datagrid_id.replace(DataGrid.compute_prefix(), DataService.compute_prefix(), 1)
   
+  def _mk_edition_cell(self, col_pos, row_index, col_def: DataGridColumnState, is_last):
+    col_array = self._fast_access.get(col_def.col_id)
+    value = col_array[row_index] if col_array is not None and row_index < len(col_array) else None
+    value_str = str(value) if not is_null(value) else ""
+    
+    save_cmd = self.commands.save_edition()
+    input_elem = mk.mk(
+      Input(value=value_str, name="value", autofocus=True, cls="dt2-cell-input"),
+      command=save_cmd
+    )
+    
+    return OptimizedDiv(
+      input_elem,
+      id=self._get_element_id_from_pos("cell", (col_pos, row_index)),
+      cls=merge_classes("dt2-cell dt2-cell-edition", "dt2-last-cell" if is_last else None),
+      style=f"width:{col_def.width}px;"
+    )
+  
+  def _mk_cell_oob(self, col_pos, row_index):
+    col_def = self._columns[col_pos]
+    filter_keyword = self._state.filtered.get(FILTER_INPUT_CID)
+    filter_keyword_lower = filter_keyword.lower() if filter_keyword else None
+    is_last = col_pos == len(self._columns) - 1
+    return self.mk_body_cell(col_pos, row_index, col_def, filter_keyword_lower, is_last)
+  
   def mk_headers(self):
     resize_cmd = self.commands.set_column_width()
     move_cmd = self.commands.move_column()
@@ -867,6 +961,10 @@ class DataGrid(MultipleInstance):
     if col_def.type == ColumnType.RowSelection_:
       return OptimizedDiv(cls="dt2-row-selection")
     
+    if (self._settings.enable_edition and
+        self._state.edition.under_edition == (col_pos, row_index)):
+      return self._mk_edition_cell(col_pos, row_index, col_def, is_last)
+    
     col_array = self._fast_access.get(col_def.col_id)
     value = col_array[row_index] if col_array is not None and row_index < len(col_array) else None
     content = self.mk_body_cell_content(col_pos, row_index, col_def, filter_keyword_lower)
@@ -1105,7 +1203,7 @@ class DataGrid(MultipleInstance):
     :param kwargs: Additional parameters for specific fragments (col_id, optimal_width for header)
     :return:
     """
-    res = []
+    res = [self.mk_selection_manager()]
     
     extra_attr = {
         "hx-on::after-settle": f"initDataGrid('{self._id}');",
@@ -1133,7 +1231,21 @@ class DataGrid(MultipleInstance):
       header.attrs.update(header_extra_attr)
       return header
     
-    res.append(self.mk_selection_manager())
+    else:
+      col_pos, row_index = None, None
+      
+      if (cell_id := kwargs.get("cell_id")) is not None:
+        col_pos, row_index = self._get_pos_from_element_id(cell_id)
+      elif (pos := kwargs.get("pos")) is not None:
+        col_pos, row_index = pos
+      
+      if col_pos is not None and row_index is not None:
+        col_def = self._columns[col_pos]
+        filter_keyword = self._state.filtered.get(FILTER_INPUT_CID)
+        filter_keyword_lower = filter_keyword.lower() if filter_keyword else None
+        is_last_col = col_pos == len(self._columns) - 1
+        cell = self.mk_body_cell(col_pos, row_index, col_def, filter_keyword_lower, is_last_col)
+        res.append(cell)
     
     return tuple(res)
   

src/myfasthtml/controls/Mouse.py

@@ -36,7 +36,8 @@ class Mouse(MultipleInstance):
 
   VALID_ACTIONS = {
     'click', 'right_click', 'rclick',
-    'mousedown>mouseup', 'rmousedown>mouseup'
+    'mousedown>mouseup', 'rmousedown>mouseup',
+    'dblclick', 'double_click', 'dclick'
   }
   VALID_MODIFIERS = {'ctrl', 'shift', 'alt'}
   def __init__(self, parent, _id=None, combinations=None):

src/myfasthtml/core/commands.py

@@ -174,7 +174,7 @@ class Command:
     # Set the hx-swap-oob attribute on all elements returned by the callback
     if self._htmx_extra[AUTO_SWAP_OOB]:
       for index, r in enumerate(all_ret[1:]):
-        if hasattr(r, "__ft__"):
+        if not hasattr(r, 'attrs') and hasattr(r, "__ft__"):
           r = r.__ft__()
           all_ret[index + 1] = r
         if (hasattr(r, 'attrs')

tests/controls/test_datagrid.py

@@ -318,7 +318,7 @@ class TestDataGridBehaviour:
     dg = datagrid
     dg._state.selection.selected = (1, 2)
     
-    dg.on_click("click", is_inside=False, cell_id=f"tcell_{dg._id}-1-2")
+    dg.handle_on_click("click", is_inside=False, cell_id=f"tcell_{dg._id}-1-2")
     
     assert dg._state.selection.selected == (1, 2)
   
@@ -332,7 +332,7 @@ class TestDataGridBehaviour:
     dg = datagrid
     cell_id = f"tcell_{dg._id}-2-5"
     
-    dg.on_click("click", is_inside=True, cell_id=cell_id)
+    dg.handle_on_click("click", is_inside=True, cell_id=cell_id)
     
     assert dg._state.selection.selected == (2, 5)