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<!DOCTYPE html> <html> <head> <style> table, td { border:1px solid black; } </style> </head> <body> <p>Click on each tr element to alert its index position in the table:</p> <table> <tr onclick="myFunction(this)"> <td>Click to show rowIndex</td> </tr> <tr onclick="myFunction(this)"> <td>Click to show rowIndex</td> </tr> <tr onclick="myFunction(this)"> <td>Click to show rowIndex</td> </tr> </table> <script> function myFunction(x) { alert("Row index is: " + x.rowIndex); } </script> </body> </html>