How to use Vue for data transfer (a brief analysis of methods)

Vue is a popular JavaScript framework that helps us build efficient user interfaces. In Vue, there are various methods for data passing, which can be applied to individual components or the entire Vue instance. This article will introduce how to use Vue for data transfer.

Props

Props is a property binding mechanism provided by Vue, which can pass data from parent components to child components. In the parent component, we can use the v-bind directive to bind data to the Props property of the child component, as shown below:

<template>
  <child-component v-bind:prop-name="parentData"></child-component>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  data() {
    return {
      parentData: 'Hello, child component!'
    }
  },
  components: {
    ChildComponent
  }
}
</script>

In the child component, we need to use the Props option to declare the property name that will be received , as shown below:

<template>
  <div>{{ propName }}</div>
</template>

<script>
export default {
  props: {
    propName: String
  }
}
</script>

In the child component, we can use this.propName to access the data passed from the parent component.

Computed

Computed is a calculated property provided by Vue, which can help us dynamically calculate the value obtained from the data source. In Vue, we can provide dependencies for computed properties, which means that when the data source changes, the computed property is automatically recalculated. The following is an example:

<template>
  <div>{{ fullName }}</div>
</template>

<script>
export default {
  data() {
    return {
      firstName: 'John',
      lastName: 'Doe'
    }
  },
  computed: {
    fullName() {
      return `${this.firstName} ${this.lastName}`;
    }
  }
}
</script>

In this example, we define two data items, firstName and lastName, and use the computed option to define a fullName calculated property. In the getter function of the calculated attribute, we dynamically splice firstName and lastName and return a complete name string.

Event Bus

Event Bus (Event Bus) is an event delivery mechanism provided by Vue, which can help us transfer cross-component data in Vue instances. We can use the $emit method in the Vue instance to trigger an event, and then use the $on method in other components to listen to this event. The following is an example:

// Event Bus
const EventBus = new Vue();

// Parent Component
<template>
  <button @click="sendMessage">Send Message</button>
</template>

<script>
export default {
  methods: {
    sendMessage() {
      EventBus.$emit('message', 'Hello, world!');
    }
  }
}
</script>

// Child Component
<template>
  <div>{{ message }}</div>
</template>

<script>
export default {
  data() {
    return {
      message: ''
    }
  },
  created() {
    EventBus.$on('message', message => {
      this.message = message;
    });
  }
}
</script>

In this example, we define a global event bus instance, trigger an event named "message" in the parent component, and pass a string message . In the child component, we listened to this event and assigned the passed message to the component's Message property.

Conclusion

In Vue, we have many methods for data transfer, each method has its own characteristics and application scenarios. Whether it is Props, Computed or event bus, they can help us build an efficient user interface. If you are using Vue to build a web application, figuring out these data transfer methods will help you better manage application data.

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