BUG: to_html misses truncation indicators (...) when index=False

pandas/io/formats/html.py

@@ -342,6 +342,7 @@ def _write_body(self, indent):
                 self._write_hierarchical_rows(fmt_values, indent)
             else:
                 self._write_regular_rows(fmt_values, indent)
+# GH 15019, GH 22783 add truncation logic below
         else:
             for i in range(min(len(self.frame), self.max_rows)):
                 row = [fmt_values[j][i] for j in range(len(self.columns))]

pandas/tests/io/formats/conftest.py

@@ -0,0 +1,12 @@
+import pytest
+
+
+@pytest.fixture
+def read_file(datapath):
+    """fixture factory to read text files from tests/io/formats/data"""
+    def _read_file(filename):
+        filepath = datapath('io', 'formats', 'data', filename)
+        with open(filepath) as f:
+            contents = f.read()
+        return contents
+    return _read_file

pandas/tests/io/formats/data/gh15019_expected_output.html

@@ -0,0 +1,31 @@
+<table border="1" class="dataframe">
+  <thead>
+    <tr style="text-align: right;">
+      <th>0</th>
+      <th>1</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>1.764052</td>
+      <td>0.400157</td>
+    </tr>
+    <tr>
+      <td>0.978738</td>
+      <td>2.240893</td>
+    </tr>
+    <tr>
+      <td>...</td>
+      <td>...</td>
+    </tr>
+    <tr>
+      <td>0.950088</td>
+      <td>-0.151357</td>
+    </tr>
+    <tr>
+      <td>-0.103219</td>
+      <td>0.410599</td>
+    </tr>
+  </tbody>
+</table>
+

pandas/tests/io/formats/data/gh22783_expected_output.html

@@ -0,0 +1,27 @@
+<table border="1" class="dataframe">
+  <thead>
+    <tr style="text-align: right;">
+      <th>0</th>
+      <th>1</th>
+      <th>...</th>
+      <th>3</th>
+      <th>4</th>
+    </tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td>1.764052</td>
+      <td>0.400157</td>
+      <td>...</td>
+      <td>2.240893</td>
+      <td>1.867558</td>
+    </tr>
+    <tr>
+      <td>-0.977278</td>
+      <td>0.950088</td>
+      <td>...</td>
+      <td>-0.103219</td>
+      <td>0.410599</td>
+    </tr>
+  </tbody>
+</table>

pandas/tests/io/formats/test_to_html.py

@@ -22,6 +22,15 @@
     pass
 
 
+@pytest.fixture
+def expected_html(read_file):
+    def _expected_html(name):
+        filename = '.'.join([name, 'html'])
+        html = read_file(filename)
+        return html.rstrip()
+    return _expected_html
+
+
 class TestToHTML(object):
 
     def test_to_html_with_col_space(self):
@@ -1905,6 +1914,22 @@ def test_to_html_multiindex_max_cols(self):
         </table>""")
         assert result == expected
 
+    def test_to_html_truncation_index_false_max_rows(self, expected_html):
+        # GH 15019
+        np.random.seed(seed=0)
+        df = pd.DataFrame(np.random.randn(5, 2))
+        result = df.to_html(max_rows=4, index=False)
+        expected = expected_html('gh15019_expected_output')
+        assert result == expected
+
+    def test_to_html_truncation_index_false_max_cols(self, expected_html):
+        # GH 22783
+        np.random.seed(seed=0)
+        df = pd.DataFrame(np.random.randn(2, 5))
+        result = df.to_html(max_cols=4, index=False)
+        expected = expected_html('gh22783_expected_output')
+        assert result == expected
+
     def test_to_html_notebook_has_style(self):
         df = pd.DataFrame({"A": [1, 2, 3]})
         result = df.to_html(notebook=True)