You may have seen some new behavior in SharePoint online where Doc Icon links are not clickable in the document library after migration from SharePoint 2010 to SharePoint Online/SharePoint 2013.

The following code can be added as a CEWP in each document library View wherever you need clickable Doc Icon functionality. This is a generic script and can be added to any SharePoint library without making any changes.
  1. <script type="text/javascript">
  2. (function () {
  3. var replaceCtrl = {};
  5. replaceCtrl.Templates = {};
  6. replaceCtrl.Templates.Fields = { 'DocIcon': { 'View': CustomIcon } };
  7. SPClientTemplates.TemplateManager.RegisterTemplateOverrides(replaceCtrl);
  8. })();
  10. function CustomIcon(ctx) {
  11. if (ctx.CurrentItem.FSObjType == '1') {
  12. var ret = "<a href=\"" + ctx.CurrentItem.FileRef + "\">" +
  13. "<img width='16' height='16' title=\"" + ctx.CurrentItem.FileLeafRef + "\" " +
  14. "class='ms-draggable' alt=\"" + ctx.CurrentItem.FileLeafRef + "\" " +
  15. "src=\"/_layouts/15/images/FOLDER.GIF\" border='0' DragId='0'/></a>";
  16. }
  17. else {
  18. var ret = "<a href=\"" + ctx.CurrentItem.FileRef + "\">" +
  19. "<img width='16' height='16' title=\"" + ctx.CurrentItem.FileLeafRef + "\" " +
  20. "class='ms-draggable' alt=\"" + ctx.CurrentItem.FileLeafRef + "\" " +
  21. "src=\"/_layouts/15/images/" + ctx.CurrentItem['HTML_x0020_File_x0020_Type.File_x0020_Type.mapico'] + "\" " +
  22. "border='0' DragId='0'/></a>";
  23. }
  24. return ret;
  25. }
  26. </script>