YouTipVue3 emits Property | Rookie Tutorial
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Vue3 emits Property
In Vue3, the emits property is used to define the events that a component can trigger.
emits is an array or object used to explicitly declare which custom events the component will emit.
Through the emits property, developers can better manage component events and improve code readability and maintainability.
Why Use the emits Property?
In Vue2, parent components listen to child component events through v-on, while child components trigger events through the $emit method. Although this approach is simple and direct, as project scales grow, event management can become chaotic. Vue3 introduces the emits property for the following benefits:
- Clear Event Declaration: Through the
emits property, developers can clearly know which events the component will trigger.
- Code Readability: Viewing the
emits property in a component allows quick understanding of the component's event interactions.
- Type Checking and Warnings: If a triggered event is not declared in
emits, Vue will issue a warning in development mode to help developers discover potential issues.
How to Use the emits Property?
1. Basic Usage
In a component, emits can be an array listing all custom event names.
Example
<script>
export default{
emits:['update:modelValue','submit'],
methods:{
handleClick(){
this.$emit('submit','Form submitted!');
}
}
}
</script>
In the example above, the emits array declares two events: update:modelValue and submit. When this.$emit('submit', 'Form submitted!') is called, the submit event is triggered and the data 'Form submitted!' is passed.
2. Object Usage
emits can also be an object where the keys are event names and the values are validation functions. The validation function is used to check whether the passed event parameters are valid.
Example
<script>
export default{
e
emits property is used to define the events that a component can trigger.emits is an array or object used to explicitly declare which custom events the component will emit.emits property, developers can better manage component events and improve code readability and maintainability.v-on, while child components trigger events through the $emit method. Although this approach is simple and direct, as project scales grow, event management can become chaotic. Vue3 introduces the emits property for the following benefits:emits property, developers can clearly know which events the component will trigger.emits property in a component allows quick understanding of the component's event interactions.emits, Vue will issue a warning in development mode to help developers discover potential issues.emits can be an array listing all custom event names.<script>
export default{
emits:['update:modelValue','submit'],
methods:{
handleClick(){
this.$emit('submit','Form submitted!');
}
}
}
</script>emits array declares two events: update:modelValue and submit. When this.$emit('submit', 'Form submitted!') is called, the submit event is triggered and the data 'Form submitted!' is passed.emits can also be an object where the keys are event names and the values are validation functions. The validation function is used to check whether the passed event parameters are valid.<script>
export default{
e