如何以编程方式添加基于变量的事件?

时间:2018-05-07 06:23:06

标签: vue.js vuejs2

所以我想以编程方式添加一个事件,例如@click取决于另一个变量。我无法真正使用引用来执行this.$refs.example.addEventListner("click", someFunction)之类的操作,因为我正在为v-for

执行此操作

我尝试过像@click="clickable ? clicked : null"这样的事情,但即使clickable为真,该函数也没有约束

<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

2 个答案:

答案 0 :(得分:4)

添加()将允许它被执行。

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

https://codesandbox.io/s/p9l4ozx60x

对于更复杂的条件语句,您可以使用computed过滤方法。

演示https://codesandbox.io/s/wnv6kjq2wk

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

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

答案 1 :(得分:0)

尝试使用此代码,您可以有条件地渲染DOM节点,我尝试了它,它就像魅力一样。

<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>