How to programmatically add event based on a variable?

Question

So I'd like to programmatically add an event, e.g. @click depending if on another variable. I can't really use a ref to do something like this.$refs.example.addEventListner("click", someFunction) because I'm doing it for a v-for

I've tried doing something like @click="clickable ? clicked : null" but the function isn't bound even when clickable is true

<template>
  <div id="app">
    <div class="main" @click="clickable ? clicked : null">
    </div>
  </div>
</template>

<script>
import HelloWorld from "./components/HelloWorld";

export default {
  name: "App",
  data() {
    return {
      clickable: false
    };
  },
  methods: {
    clicked() {
      console.log("clicked");
    }
  },
  components: {
    HelloWorld
  }
};
</script>

<style>
#app {
  font-family: "Avenir", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
.main {
  background-color: yellow;
  height: 200px;
  width: 400px;
}
</style>

https://codesandbox.io/s/m941978v9x

Jacob Goh · Accepted Answer · 2018-05-07 06:33:44Z

4

Adding () would allow it to be executed.

@click="clickable ? clicked() : null"

https://codesandbox.io/s/p9l4ozx60x

For more complex conditional statements, you could filter the method using computed.

Demo https://codesandbox.io/s/wnv6kjq2wk

<div class="main" @click="clickedMaybe">
</div>

and

  computed:{
    clickedMaybe(){
      if(this.clickable) return this.clicked;
      return function(){};
    }
  },

edited May 7, 2018 at 6:33

answered May 7, 2018 at 6:26

Jacob Goh

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2 Comments

A. L Over a year ago

That's interesting. Didn't think you'd need to use () to make it executable since the default @click allows you to pass a function without it. Will mark when can

Jacob Goh Over a year ago

I think Vue will automatically detect whether what's provided is a method name or a Javascript statement. clickable ? clicked : null is a statement. I think that Vue's too magical sometimes that it causes confusion.

MehulJoshi · Accepted Answer · 2018-05-07 06:32:47Z

0

Try this code, You can conditionally render the DOM node, I tried it and it's working like charm.

<template>
  <div id="app">

    <div class="main" v-if="clickable" @click="clicked"></div>
    <div class="main" v-if="!clickable"></div>
  </div>
</template>

<script>
import HelloWorld from "./components/HelloWorld";

export default {
  name: "App",
  data() {
    return {
      clickable: true
    };
  },
  methods: {
    clicked() {
      console.log("clicked");
    }
  },
  components: {
    HelloWorld
  }
};
</script>

<style>
#app {
  font-family: "Avenir", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
.main {
  background-color: yellow;
  height: 200px;
  width: 400px;
}
</style>

answered May 7, 2018 at 6:32

MehulJoshi

8898 silver badges19 bronze badges

2 Comments

A. L Over a year ago

works nice when it's simply just got 1 props, but I've got like 10 props and events on it, so making a secondary node just to enable 1 event is too much bloat.

MehulJoshi Over a year ago

@A.Lau Right. but try consol log this in both the cases.

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