Support for multi-level dropdown

[mharis]

No description provided.

[PlanBrewski]

Thanks for the commit @mharis!

I'm pretty torn on the multi-level dropdown issue. My one issues with merging this is I have been fighting adding support for multi-level dropdowns for quite some time. The reasons for that are:

1. Its not natively supported by Bootstrap 3. You probably noticed that I purposely made the walker ignore everything over one level deep. This was in an effort to not include unsupported markup.
2. The script was intended to be a simple drop in and add a few lines of code to your theme, with no additions the the bootstrap framework.

On the other hand it's requested by users every second day. After some thought I think this may be something that we can gracefully integrate into the repo with a few conditions.

1. The additional files be moved to an add-ons directory. This way its clear that it is not necessary to integrate to use the walker. This also leaves room for other features like my nav-list walker ( https://github.com/twittem/wp-bootstrap-navlist-walker ) So your files would be in add-ons > multi-level-dropdown
2. The add-on must offer full support for all responsive breakpoints without causing confusion for the user.
3. The walker must not output additional markup if the add-on is not integrated. My thought on this is adding a function to process add-ons support where you would add something the example below this to your functions.php file to add support for the add-on. We can then use the setting in the walker class to conditionally add functionality, but only when it is intended. In Fact this may be a great way to handle glyphicons.

if ( class_exists( 'WP_Bootstrap_Navwalker' ) ) {
    WP_Bootstrap_Navwalker::add_addon_support( array( 
        'multi-level-dropdown',
        'nav-list' )
    );
}

I would love to know your thoughts on this method. If it is an avenue you agree with I will create a dev branch and we can merge pull request there.

[mharis]

Hey Edward,

Yes, I am quite aware that BS3 no longer supports multi level dropdowns since it is built for mobile first and multi level dropdowns just doesn't work well on mobiles.

The theme I am working on requires multi-level dropdowns. Multi-level dropdown is much loved and used by our users quite a lot. Its crazy but I have seen many 5 level multi-level dropdown. Personally, I am not a fan of 2nd level or more dropdowns.

I can agree with your thoughts and we should do exactly like you suggest to add support for multi level dropdowns. Next I am working on adding responsive breakpoints to the navigation for multi-level dropdowns. Hit me up on skype, my ID is muhammad-haris and we can talk more about this.

Thanks!

[PlanBrewski]

I am going to close this pull request. If you want to re-initiate the pull request on the DEV branch I will gladly merge it. Thanks for your work on this.