rails中select_tag的用法小结

select_tag "people", "<option>David</option>".html_safe

<select id="people" name="people">
<option>David</option>
</select>

select_tag "colors", "<option>Red</option><option>Green</option><option>Blue</option>".html_safe, multiple: true

<select id="colors" multiple="multiple" name="colors[]"><option>Red</option>
<option>Green</option>
<option>Blue</option>
</select>

select_tag "people",<option value="1">David</option>, include_blank: true

<select id="people" name="people">
<option value=""></option>
<option value="1">David</option>
</select>

select_tag "people", <option value="1">David</option>, include_blank: "All"

<select id="people" name="people">
<option value="">All</option>
<option value="1">David</option>
</select>

@people

id

@people.id

name

@people.name

prompt

select_tag "people", options_from_collection_for_select(@people, "id", "name"), prompt: "Select something"

<select id="people" name="people">
<option value="">Select something</option>
<option value="1">David</option>
</select>

options_from_collection_for_select(\*args)的第四个参数为默认选项

select_tag "people", options_from_collection_for_select(@people, "id", "name","1"), prompt: "Select something"

<select id="people" name="people">
<option value="">Select something</option>
<option value="1" selected='selected'>David</option>
</select>