What could be the reason that Vue is not evaluating anything when the directive @click is specified as "true && method"?

Consider the following scenario:


LandingPage.vue

<template>
  <button @click="handleClick">Click Me</button>
</template>

<script>
export default {
  methods: {
    handleClick() {
      this.$emit("click");
    }
  }
};
</script>

App.vue

<template>
  <div>
    <LandingPage @click="true && handleButtonClick" />
  </div>
</template>

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

export default {
  components: {
    LandingPage
  },
  methods: {
    handleButtonClick() {
      window.alert("Button clicked!");
    }
  }
};
</script>

In this case, why does the click event not trigger anything?

Why doesn't

@click="true && handleButtonClick"
work as expected?

How does Vue interpret and evaluate expressions like these behind the scenes?

Answer №1

Let's take a look at what's happening in the code:

@click is actually a shortcut for v-on:click. It is interpreted as a string and compared to the names of methods defined within your Vue instance. If there is a match, the function associated with that method is executed with the original event passed as a parameter.

If the string does not match any of the defined methods, Vue will run that code within the scope of the Vue instance itself. This is why expressions like click="click(smth)" and click="true && click();" work. However, trying to execute a method named true && click (which cannot be defined due to spaces) will result in nothing happening.

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