title: Pass selected value to vuejs function
body: <p>How can I pass selected value to a vuejs function?
  <code>v-model</code> won't help I guess.</p>
  
  <p>I need to set values for the filter after
  <code>item: items | orderBy sortKey reverse</code>
  where <code>reverse</code> and <code>sortKey</code> are dynamic values.  </p>
  
  <p><strong>html</strong></p>
  
  <pre><code>&lt;select class="sort-filter" v-on="change: sortBy(???)"&gt;
    &lt;option value="title asc"&gt;Title (A-Z)&lt;/option&gt;
    &lt;option value="title desc"&gt;Title (Z-A)&lt;/option&gt;
    &lt;option value="price asc"&gt;Price (Min. - Max.)&lt;/option&gt;
    &lt;option value="price desc"&gt;Price (Max. - Min.)&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p><strong>js</strong></p>
  
  <pre><code>  methods: {
      sortBy: function (sortKey) {
        console.log(sortKey)
      }
    }
  </code></pre>