Implementation method of slot internal value transfer function in Vue documentation

Vue is an open source JavaScript framework for building web interfaces. An important feature of Vue is the use of slots, which can easily implement functions such as communication between components and event delivery. This article will discuss how to implement the value transfer function inside the slot based on the introduction of Vue slots.

Vue Slot Basics

Slots in Vue are a mechanism for passing the content of parent components to child components. It allows us to define some content in the parent component and use this content in the child component. Slots in Vue can be divided into named slots and default slots.

Multiple named slots can be defined and referenced by name. The following is an example of a named slot:

<template>
  <div>
    <slot name="header"></slot>
    <div>
      <slot></slot>
    </div>
    <slot name="footer"></slot>
  </div>
</template>

In the above example, we defined three slots, of which the head and tail are named slots, and the unnamed one is the default slot.

When using this component in the parent component, we can pass content to these slots:

<template>
  <my-component>
    <template v-slot:header>
      <h1>This is header</h1>
    </template>
    <p>This is content.</p>
    <template v-slot:footer>
      <h1>This is footer</h1>
    </template>
  </my-component>
</template>

In the above example, we use the v-slot directive to pass content to the slots Deliver content. We need to specify the name of the slot, here we use the writing method of named slot.

Vue slot passes value

Vue’s slot can be used to pass data, such as the following example:

<template>
  <div>
    <slot :message="message"></slot>
  </div>
</template>

In the above example, we used a name variable for message and pass it to the slot.

In the parent component, we can use the slot like this:

<template>
  <my-component>
    <template v-slot="slotProps">
      <div>{{ slotProps.message }}</div>
    </template>
  </my-component>
</template>

In the above example, we used the default writing method of v-slot and assigned the content in the slot to slotProps variable. We then render the value of this variable in the slot.

Implementing the value-passing function inside the slot

Sometimes we need to define a value-passing function inside the slot to implement more complex functions. For example, we can define a function to handle the data passed in the slot:

function handleMessage(message) {
  // 处理消息
}

We need to define this function in the slot and pass it to the child component. Here is an example:

<template>
  <div>
    <slot :handle-message="handleMessage"></slot>
  </div>
</template>

In the above example, we added a function called handleMessage and passed it to the slot.

Then we use the slot in the parent component:

<template>
  <my-component>
    <template v-slot="slotProps">
      <button @click="slotProps.handleMessage('This is a message.')">Click me</button>
    </template>
  </my-component>
</template>

In the above example, we render a button in the slot and bind a click event. When we click this button, a message will be passed to the handleMessage function.

Finally, we need to define the slot in the subcomponent and call the passed function:

<template>
  <div>
    <slot :message="message" :handle-message="handleMessage"></slot>
  </div>
</template>

In the above example, we assign the message and function in the slot to The message and handleMessage variables are added. We can then call this function in the child component:

mounted() {
  this.$slots.default[0].context.handleMessage('This is a message.');
},

In the above example, we used the $slots attribute to get the contents of the slots. Then we called the handleMessage function and passed a message.

Summary

In Vue, slots are a very useful mechanism that can facilitate communication and data transfer between components. We can pass data and functions into slots and interact with them in parent and child components. For the implementation of the value-passing function inside the slot, we need to define a function to process data and pass it to the slot. Then call this function in the subcomponent to complete the data processing function.

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