VZ Picky will display a dropdown <select> list of all the unique values for a particular custom field. Perfect for advanced search forms! You can also use it as a tag pair to loop through the unique values and generate your own markup.
<select>
{exp:vz_picky field="field_name"}
</select>
Outputs a list of <option> elements containing each unique value in the custom field.
{exp:vz_picky field="field_name"}
{value}<br/>
{/exp:vz_picky}
Loops through each unique value in the field.
field - The short name of the custom field to pull values from.
separator - You can further break apart each value using this parameter. If a field contains a comma-separated list of tags, for instance, this will list each tag as its own option
sort="alpha" - Sort the values alphabetically. If this is not set, they will be displayed in the order they appear in the database.
status - Only use values from entries with a particular status (or statuses). Uses the same syntax as the channel:entries tag. Defaults to open.
site_id - On a multi-site installation, the id of the site to use. Defaults to 1.
value - Value to pre-select.
placeholder - Text to display when nothing is selected.
hide_placeholder="yes" - Do not display any placeholder element. Mostly useful for multiple-selects.
Place the vz_picky folder into /system/expressionengine/third_party/. That's it, you're done!
This is provided for free with no guarantee or promise of support. However, if you run into any trouble or have a suggestion, please post an issue (or a pull-request!) at https://github.com/elivz/vz_picky.ee_addon. I'll do my best to help as time allows.