The core of creating reusable components in Vue is to understand component structure, props usage, and logical encapsulation. 1. Clarify component responsibilities and input and output, such as defining props and update:modelValue events that receive label, placeholder, modelValue; 2. Extract styles and structures, and improve universality through class, style attributes or slots; 3. Use slots to support custom content, such as allowing label slots to pass in rich text; 4. Extract public logic into a combination function, such as encapsulating verification logic with useInputValidation to enhance component scalability and reusability.
Creating a reusable component in Vue is the core of understanding the basic structure of the component, how props are used, and how to encapsulate common logic. As long as the structure is clear and the interface is clear, components that can be written can be easily written that can be reused in multiple places.
1. Clarify component responsibilities and input and output
Before writing a component, think clearly what it is going to do. For example, is it a button, form item, or a more complex interactive module? Then determine which external data it needs to receive and which events (emits) are triggered.
For example: you want a general <inputfield></inputfield> component that should receive label, placeholder, value, and update the value as the user enters.
export default {
props: ['label', 'placeholder', 'modelValue'],
emits: ['update:modelValue']
}After this design, this component can be flexibly used by different pages or parent components.
2. Remove styles and structures to maintain versatility
To make components easier to reuse, try to avoid writing dead styles or fixed behaviors. You can pass in with the class or style attributes, or use the default slot for enhanced flexibility.
for example:
<template>
<div class="input-field">
<label>{{ label }}</label>
<input
:placeholder="placeholder"
:value="modelValue"
@input="$emit('update:modelValue', $event.target.value)"
:class="inputClass"
/>
</div>
</template> This way you can control the input box style through inputClass without modifying the component itself code every time.
3. Use slots to improve flexibility
Many times we hope that the content of the component can be determined by the user, and then the slot can be used. For example, let label support custom content:
<template>
<div class="input-field">
<label><slot name="label">{{ label }}</slot></label>
<input ... />
</div>
</template>This way, you can pass in rich text labels or keep the default text when using it.
4. Composition API for public logic
If you use the Composition API of Vue 3, you can extract some general logic, such as verification logic, input processing, etc.
For example:
// useInputValidation.js
export function useInputValidation(value, rules) {
const isValid = computed(() => {
return rules.every(rule => rule.test(value.value))
})
return { isValid }
}Then it is introduced and used in the component, so that the logic of the component itself will be more concise and convenient to reuse it in other components.
Basically that's it.
Creating reusable components is not complicated, but the key is to consider the boundaries of the components, the design of input and output, and whether they are scalable.
At the beginning, you may only need to support a few props, but as the usage scenarios increase, slowly adding slots, events, and combination functions can make it more powerful.
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