Adding attributes to link in wp_nav_menu using custom Walker function

You want to modify the start_el method as you did the start_lvl one. At its most basic it would mean altering this line:

$item_output .= '<a'. $attributes .'>';

To look like this one:

$item_output .= '<a class="dropdown-toggle" data-toggle="dropdown"'. $attributes .'>';

It looks like you will need more complicated logic to avoid inserting that string in all the submenus, but that is the idea.

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