gistfile1.html

<span data-bind="foreach: textVerticalTrimOptions">
  <button data-bind="
      text: name,
      value: value,
      click: $parent.setTextVerticalTrim
  "></button>
</span>

<script>
  VM = function() {
    var self = this;
    
    /* some non important stuff… */
    
    this.textVerticalTrim = ko.observable(0),
    
    this.setTextVerticalTrim = function(button) {
      self.textVerticalTrim(button.value);
    }
  }
</script>