What could be the reason behind my Vue custom directives not functioning as expected?

I'm brand new to Vue and very inexperienced with custom directives. I'm attempting something basic, but it doesn't seem to be working correctly. Can someone please help me figure out what's wrong? Thank you in advance! I have created two directives: one in main.ts:

app.directive('display', {
  beforeMount: (el, binding) => {
    el.style.display = binding.value
  }
})

The other one is in App.vue:

app.directive('color', {
      beforeMount: el => {
        el.style.color = 'red'
      }
    })

I am trying to use the directives like this, but nothing is happening:

    <h1
      class="text-4xl font-semibold my-10 text-center capitalize text-black dark:text-white"
      v-display:none
      v-color
    >

If I need to register them, I am unsure of how to do so. In my Component FAQ (where I am implementing the directives), I tried this:

  directives: {
    color: {

    }
  } 

Answer №1

It seems that the issue lies in the way you are using your custom directive definition. Consider trying the following usage:

<h1 
  class="..."
  v-display="`none`"
  v-color
>

The reason for wrapping the word none in `` or '' is to ensure Vue interprets it correctly. If you simply write v-display="none", Vue will look for a variable named none, resulting in undefined. By writing v-display="'none'", you pass the string none which Vue can process.

I believe v-color should function as intended. You can check out this working example for reference.

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