Multi-select field

Hi, your plug-in is absolutely fantastic. Thank you so much. I really really like the way it is set up, so that I can still use your settings to control the form even if I customize it.

I working on a multi-select field, so posters can choose multiple tags from a given list to add to their post. (The site is for reporting housing code violations, so the poster chooses one or more hazard types from the list.) I modified the submission-form and it works great except that even if you select several values, only one of them gets passed to the submission:

if ($usp_options['usp_tags'] == 'show' || $usp_options['usp_tags'] == 'optn') { ?>

		<fieldset class="usp-tags">
			<label for="user-submitted-tags"><?php _e('Hazards/Violations (choose all that apply)', 'usp'); ?></label>

			<select name="user-submitted-tags" size="17" multiple="multiple" tabindex="1">
				<option value="abandoned_construction">Abandoned construction</option>
				<option value="abandoned_vehicle">Abandoned vehicle</option>
				<option value="boarded-windows_doors">Boarded windows/doors</option>
				<option value="broken_missing_windows">Broken/missing windows</option>
				<option value="collapsing_unsafe_porch_deck">Collapsing/unsafe porch/deck</option>
				<option value="collapsing_unsafe_roof">Collapsing/unsafe roof</option>
				<option value="collapsing_unsafe_steps_entryway">Collapsing/unsafe steps/entryway</option>
				<option value="collapsing_unsafe_structure">Collapsing/unsafe structure</option>
				<option value="garbage">Garbage</option>
				<option value="hazardous_construction">Hazardous construction</option>
				<option value="hazardous_sidewalk_conditions">Hazardous sidewalk conditions</option>
				<option value="obviously_vacant">Obviously vacant</option>
				<option value="open_to_elements">Open to elements (rain can get in)</option>
				<option value="tall_grass_or_weeds">Tall grass or weeds</option>
				<option value="unsanitary_conditions">Unsanitary_conditions</option>
				<option value="unsecured">Unsecured (easy to get inside)</option>
				<option value="other_describe_below">Other (describe below)</option>

			</select>

		</fieldset>

Is there a better class to use than usp-tags or something else from the library that could help? I just want to make sure the information is carried through to the post. Or maybe there is a better way to do this in general. I could also ask the users to type the tags and post a list of options.

Not being an expert user, I’m afraid to wander too far from your standard form, because I’m not quite sure how the flow of information from it to the post works. Maybe there is an easy way to do this!

Thanks again for this product. It’s an incredible contribution and very appreciated.

Have a great day.

https://wordpress.org/plugins/user-submitted-posts/