[前端+RAG] PDF原生渲染(pdfjs text layer)；Excel列宽优化+水平滚动

langchain-chat/server/knowledge_base/file_converter.py

@@ -1070,13 +1070,43 @@ class FileConverter:
     def xlsx_to_html(self, input_path: str, output_path: Optional[str] = None) -> str:
         try:
             import openpyxl
+            from openpyxl.utils import get_column_letter
             wb = openpyxl.load_workbook(input_path, data_only=True)
-            style = '''<style>.excel-table{border-collapse:collapse;width:100%;margin:1em 0;} .excel-table td,.excel-table th{padding:8px;border:1px solid #ddd;}</style>'''
+            style = '''<style>
+.excel-table-wrapper{overflow-x:auto;margin:1em 0;}
+.excel-table{border-collapse:collapse;margin:0;table-layout:fixed;}
+.excel-table td,.excel-table th{padding:6px 10px;border:1px solid #d0d0d0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:13px;vertical-align:middle;}
+.excel-table tr:nth-child(even){background:#fafbff;}
+</style>'''
             html = []
             for idx, sheet in enumerate(wb.worksheets):
                 html.append(f'<h3>Sheet {idx+1}: {sheet.title}</h3>')
-                html.append('<div class="table-container">')
-                html.append('<table class="excel-table" border="1" style="border-collapse:collapse;width:100%;margin:1em 0;">')
+                # 计算列宽
+                col_widths = {}
+                for col_idx in range(1, sheet.max_column + 1):
+                    col_letter = get_column_letter(col_idx)
+                    dim = sheet.column_dimensions.get(col_letter)
+                    if dim and dim.width and dim.width > 0:
+                        # openpyxl width 以字符数为单位，约 7px/字符
+                        col_widths[col_idx] = max(60, int(dim.width * 7.5))
+                    else:
+                        # 根据内容估算宽度
+                        max_len = 8
+                        for row_idx in range(1, min(sheet.max_row + 1, 50)):
+                            cell = sheet.cell(row=row_idx, column=col_idx)
+                            if cell.value is not None:
+                                max_len = max(max_len, len(str(cell.value)))
+                        col_widths[col_idx] = max(60, min(300, max_len * 9))
+
+                html.append('<div class="excel-table-wrapper">')
+                html.append('<table class="excel-table" border="1">')
+                # colgroup 设置列宽
+                html.append('<colgroup>')
+                for col_idx in range(1, sheet.max_column + 1):
+                    w = col_widths.get(col_idx, 80)
+                    html.append(f'<col style="width:{w}px;min-width:{w}px;">')
+                html.append('</colgroup>')
+
                 merged_map = {}
                 for r in sheet.merged_cells.ranges:
                     min_row, min_col, max_row, max_col = r.min_row, r.min_col, r.max_row, r.max_col
@@ -1099,6 +1129,8 @@ class FileConverter:
                                 td_attrs += f' rowspan="{rowspan}"'
                             if colspan > 1:
                                 td_attrs += f' colspan="{colspan}"'
+                            # 合并单元格允许换行
+                            style_str += 'white-space:normal;word-wrap:break-word;'
                         html.append(f'<td{td_attrs} style="{style_str}">{cell_value}</td>')
                     html.append('</tr>')
                 html.append('</table></div>')