vue refs method parameters

With the continuous development of front-end technology, the Vue framework has undoubtedly become the most popular front-end framework. The complexity of Vue components is also increasing. Therefore, the Vue framework provides many APIs to make development more flexible and efficient. One of them is the refs method. The refs method is used to access an instance or element of a component in Vue. This article will introduce the parameters of the Vue refs method and its use.

What is the refs method?

When Vue creates a component, it assigns a unique name to the component so that it can be used in other components. This name is called a "reference" because it is used as a pointer to reference the component. The refs method needs to specify a name for the component or element, and then the instance of the component or element can be accessed through this name.

refs usage

In Vue, we can use v-bind or v-on to bind components or elements and references together. For example, assuming we have a component, we can use the following code to bind it to a ref name.

<custom-component v-bind:ref="myComponentRef"></custom-component>

We can now access this through the refs method An instance of the component. For example, in a Vue instance, we can use the following code to get a reference to the component.

this.$refs.myComponentRef

If there are multiple identical components in the instance, we can use the index to access them. For example, if we have two identical components, we can use the following code to access them.

this.$refs.myComponentRef[0]

This method can be applied not only to components, but also to HTML elements. For example, we can also use refs to reference a div element.

<div ref="myDivRef"></div>

We can use the following code to access the div element.

this.$refs.myDivRef

Parameter types supported by refs

Although the refs method is mainly used for components and HTML elements in Vue, It supports more parameter types than these. The refs method supports the following three parameter types.

1. String: Similar to the examples we listed above, we can specify a string for the component or element.

<custom-component v-bind:ref="myComponentRef"></custom-component>

2. Object: us You can also use objects to bind component or element references. For example, the following code will use the property name in the object to reference the component.

##

at In this example, we can use the following code to get an instance of the component.

this.$refs.myComponentRef

Function: Another method available is to use a function to name the component or element. In this method, the function should return an instance of a component or HTML element. For example, the following code calls the function and uses the object returned by the function to reference the component.

<custom-component v-bind:ref="myComponentRef"></custom-component>

In this example, we A function is defined to return a component instance.

methods: {
  getComponentRef() {
    return this.$refs.myComponentRef;
  }
}

We can use the following code to get an instance of this component.

this.$refs.getComponentRef()

Summary

In Vue, the refs method is used to access instances of components and HTML elements. The refs method can use strings, objects, or functions to name components or elements. Through this article, we can learn about all the parameters of the refs method and their usage. We believe this will be very useful for developers using Vue.

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