wp_dropdown_pages() should be able to generate a multi-select

[christian_gnoth]

it would be useful if this functions offers parameters for this two options:

• multiple="multiple"
• size="xyz"

so that also drop down boxes with multiple select option and a bigger size can be displayed

[nacin]

Core doesn't need this, but you can re-open with a patch.

[GaryJ]

Inclusion of multiple and size attributes on wp_dropdown_pages(). Some whitespace fixing.

[mdawaffe]

Looks reasonable. No need to escape quotes: \". Just nest with the opposite quote style.

Should selected accept an array/csv of IDs?

PS: Can we add the args to the filter? Seems pretty useless without it.

apply_filters( 'wp_dropdown_pages', $output, $r );

[GaryJ]

I would have preferred not to escape quotes, but it does elsewhere in the function, so I was keeping with consistency.

I agree with selected now needing to accept multiple values, but I'm not sure how to amend that so it feeds nicely into the walker - some amendment of Walker_PageDropdown::start_el() checking with is_array() may well be needed.

[ocean90]

#20156 with another patch for multiple values.

[scribu]

<select multiple> has a horrible UX. We should not encourage it's use.

[scribu]

Going to close as duplicate of #20156, since it has more patches.