The role of ref in vue

ref is used in Vue.js to get a reference to a component or DOM element, establishing a connection from the Vue instance to the component or DOM element, allowing direct access and manipulation. Usage of ref includes: direct access to components or DOM elements, communication with sub-components, manipulation of DOM outside the template

The role of ref in Vue

#ref is a built-in directive in Vue.js, used to get a reference to a component or DOM element. It can be assigned to any component or DOM element via the ref attribute. The main role of ref is to establish a direct connection from the Vue instance to the component or DOM element, allowing direct access and manipulation of the component or DOM element.

Usage

The syntax for using the ref directive is as follows:

<component-name ref="ref-name" />

For example:

<my-component ref="myComponent" />

This will assign a component named ref of "myComponent" and link it to the Vue instance.

Access ref

You can access ref through the $refs object:

this.$refs.myComponent // my-component 实例

Function

ref is very useful in Vue because it allows:

• Direct access to a component or DOM element: This allows you to perform programmatic operations on a component or DOM element, e.g. : Trigger methods, get data or update styles.
• Communicate with child components: Using ref, you can directly access the child component from the parent component, thereby achieving cross-component communication.
• Manipulating the DOM outside the template: ref DOM elements can be accessed outside of Vue lifecycle hooks (such as mounted and updated), This is useful for working with third-party libraries or directly manipulating DOM elements.

Best Practices

There are some best practices to follow when using refs:

• Avoid in templates Use redundant refs.
• Use ref only when you need it.
• Use descriptive ref names to clearly identify the component or DOM element.

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