Sitemap priority editor changed to slider (#49)

[jveer]

Adds the slider for #49

The value 0 is submitted to the saving endpoint as undefined so it will be stored as null in the database. Which means there is no longer an option to set the priority to 0.

If setting the priority to 0 should be available, we could maybe add a toggle input to enable the slider first? I'll leave it up to you to decide @patrickdemooij9 😉

[patrickdemooij9]

@jveer, that is a difficult one... 0 doesn't really indicate that the value would be excluded from the sitemap. So, I guess a toggle would probably be the way to go here

[jveer]

Updated the PR to add a checkbox to handle this situation

Checkbox disabled:

Checkbox enabled:

[patrickdemooij9]

@jveer
Getting the following error when going to a document type now:

Seems to be caused by this 'ng-if'. Replacing it with ng-show seems to fix it

[jveer]

@patrickdemooij9 thanks for testing it properly, the latest commit should resolve this issue

[patrickdemooij9]

Looking great! Tested it and works as expected. Thanks for the pull request