back to the lesson

Sort the table

importance: 5

There’s a table:

Name Surname Age
John Smith 10
Pete Brown 15
Ann Lee 5
... ... ...

There may be more rows in it.

Write the code to sort it by the "name" column.

Open a sandbox for the task.

The solution is short, yet may look a bit tricky, so here I provide it with extensive comments:

let sortedRows = Array.from(table.rows)
  .sort((rowA, rowB) => rowA.cells[0].innerHTML > rowB.cells[0].innerHTML ? 1 : -1);

  1. Get all <tr>, like table.querySelectorAll('tr'), then make an array from them, cause we need array methods.

  2. The first TR (table.rows[0]) is actually a table header, so we take the rest by .slice(1).

  3. Then sort them comparing by the content of the first <td> (the name field).

  4. Now insert nodes in the right order by .append(...sortedRows).

    Tables always have an implicit element, so we need to take it and insert into it: a simple table.append(...) would fail.

    Please note: we don’t have to remove them, just “re-insert”, they leave the old place automatically.

Open the solution in a sandbox.