VueJS Custom Directive Function as Argument

Question

I've got a simple directive:

HTML:

<div id="app">
  <div v-sample:callback="greet"></div>
</div>
<script>
  var app = new Vue({
    el: "#app",
    data: {
      files: [],
    },
    methods: {
      greet: function (arg) {
        alert(arg);
      },
    },
  });
</script>

JS:

Vue.directive('sample', {
  bind: function (el, binding, vnode) {
    el.addEventListener('...', function () {
      // ...
      callback.call(arg, ...);
    });
  },
});

However, I'm unclear of the appropriate syntax to get the function and evaluate. What's the proper way to do this from within a directive?

Answer 1

You can use binding.value which should be a function in this case. It's already prebound to correct context so just call it (pass anything in it if you need something):

Vue.directive('sample', {
  bind: function (el, binding, vnode) {
    el.addEventListener('click', function () {
      binding.value()
    });
  },
});