Add support for controlling text alignment in DataFrame and Tabulator

examples/reference/widgets/DataFrame.ipynb

@@ -58,6 +58,7 @@
     "* **``selection``** (``list``) The currently selected rows.\n",
     "* **``show_index``** (``boolean``): Whether to show the index column.\n",
     "* **``sortable``** (``sortable``): Allows to sort table's contents. By default natural order is preserved.  To sort a column, click on it's header. Clicking one more time changes sort direction. Use Ctrl + click to return to natural order. Use Shift + click to sort multiple columns simultaneously\n",
+    "* **``text_align``** (``dict`` or ``str``): A mapping from column name to alignment or a fixed column alignment, which should be one of 'left', 'center', 'right'.\n",
     "* **`titles`** (``dict``): A mapping from column name to a title to override the name with.\n",
     "* **``value``** (``pd.DataFrame``): The pandas DataFrame to display and edit\n",
     "* **``widths``** (``dict``): A dictionary mapping from column name to column width in the rendered table.\n",

examples/reference/widgets/Tabulator.ipynb

@@ -41,6 +41,7 @@
     "* **``selection``** (``list``): The currently selected rows.\n",
     "* **``selectable``** (`boolean` or `str`): Whether to allow selection of rows. Can be `True`, `False`, `'checkbox'` or `'toggle'`. \n",
     "* **``show_index``** (``boolean``): Whether to show the index column.\n",
+    "* **``text_align``** (``dict`` or ``str``): A mapping from column name to alignment or a fixed column alignment, which should be one of 'left', 'center', 'right'.\n",
     "* **`theme`** (``str``): The CSS theme to apply (note that changing the theme will restyle all tables on the page).\n",
     "* **`titles`** (``dict``): A mapping from column name to a title to override the name with.\n",
     "* **``value``** (``pd.DataFrame``): The pandas DataFrame to display and edit\n",

panel/widgets/tables.py

@@ -45,6 +45,10 @@ class BaseTable(ReactiveData, Widget):
     show_index = param.Boolean(default=True, doc="""
         Whether to show the index column.""")
 
+    text_align = param.ClassSelector(default={}, class_=(dict, str), doc="""
+        A mapping from column name to alignment or a fixed column
+        alignment, which should be one of 'left', 'center', 'right'.""")
+
     titles = param.Dict(default={}, doc="""
         A mapping from column name to a title to override the name with.""")
 
@@ -129,6 +133,11 @@ def _get_column_definitions(self, col_names, df):
                 formatter = StringFormatter()
                 editor = StringEditor()
 
+            if isinstance(self.text_align, str):
+                formatter.text_align = self.text_align
+            elif col in self.text_align:
+                formatter.text_align = self.text_align[col]
+
             if col in self.editors and not isinstance(self.editors[col], (dict, str)):
                 editor = self.editors[col]
 
@@ -1004,6 +1013,11 @@ def _config_columns(self, column_objs):
                 if column.field in group_cols
             ]
             col_dict = {'field': column.field}
+
+            if isinstance(self.text_align, str):
+                col_dict['hozAlign'] = self.text_align
+            elif column.field in self.text_align:
+                col_dict['hozAlign'] = self.text_align[column.field]
             formatter = self.formatters.get(column.field)
             if isinstance(formatter, str):
                 col_dict['formatter'] = formatter