How can a default function be set for a prop with the type of function?
props: {
clickFunction: {
type: 'Function'
default: ????
}
}
How can a default function be set for a prop with the type of function?
props: {
clickFunction: {
type: 'Function'
default: ????
}
}
Affirmative:
Vue.component('bar', {
template: '<div>{{ number }}</div>',
props: {
action: {
type: Function,
default: () => 1,
},
},
data() {
return {
number: this.action()
}
}
})
new Vue({
el: '#application',
});<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="application">
<bar></bar>
</div>
It is always a good practice to provide a default value that matches the specified type when setting props in your Vue components. This makes it much easier to understand and work with the code. For example, if you need a function that does nothing as a default value, you can define it like this:
props: {
clickHandler: {
type: Function,
default: () => {}
}
}
By using this.clickHandler() in your code, you can be confident that it will always be a function without needing defensive checks. Just be cautious not to confuse this approach with setting a default value for an Object prop, which would involve returning an empty object:
props: {
someObject: {
type: Object,
default: () => ({})
}
}
In Vue, it's important to return the default value for Object and Array props within a function to ensure they are unique for each component instance. Although this might not be necessary for Function props, clarity on this topic from the documentation would be helpful.
Here is a method that should function properly with Vue 2.0
parameters: {
eventHandler: {
format: 'Function'
default(){
return () => true
}
}
}
This approach may not be the most suitable for Vue. Why do you want to pass a reference to a function as a prop? Components can emit their own events that the parent can listen for.
If you need help with props types, check out: https://v2.vuejs.org/v2/guide/components-props.html
For information on custom events, visit: https://v2.vuejs.org/v2/guide/components-custom-events.html#Event-Names
Edit I realize that my initial answer was incorrect and did not address the question directly. To answer simply: yes, there are various ways to set a default function for a prop with a function type (refer to other answers).
I will stop here on the topic of patterns and use-cases being off-topic (although someone provided an interesting insight in response to my answer).
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