autorun

select.js

Template.afSelect_semanticUI.onRendered(function() {
  let node = this.$(this.firstNode);

  node.dropdown(_.extend({
    fullTextSearch        : this.data.atts.fullTextSearch || false,
    allowAdditions        : this.data.atts.allowAdditions || false,
    maxSelections         : this.data.atts.maxSelections || false,
    allowCategorySelection: this.data.atts.allowCategorySelection || false,
    useLabels             : this.data.atts.useLabels === false ? false : true
  }, this.data.atts.settings));

  this.autorun((c) => {
    let data = Template.currentData();
		let prevData = {value: null};
    if (data.value && data.value !== prevData.value) {
			prevData.value = data.value;
      node.dropdown("set selected", data.value);
    }
  });
});