I attempted to declare a constant in a .vue file:
<script>
export const CREATE_ACTION = 1,
export const UPDATE_ACTION = 2
<script>
Then, I tried to use them in the template:
<template>
...
<select :disabled="mode === UPDATE_ACTION">
....
</template>
Unfortunately, it doesn't seem to be working. How can I make use of constants in a Vue template?
By exposing them in your data, you are causing them to react unnecessarily, as mentioned by @mix3d...
A more effective method is to incorporate them into the Vue object Reactivity in Depth:
<template>
<div v-if="action === CREATE_ACTION">Something</div>
</template>
<script>
export default {
created() {
this.CREATE_ACTION = CREATE_ACTION;
this.UPDATE_ACTION = UPDATE_ACTION;
}
})
</script>
Reveal the information in your dataset:
new Vue({
data:{
ADD_ACTION: ADD_ACTION,
EDIT_ACTION: EDIT_ACTION
}
})
If you need to incorporate a specific functionality into multiple components, consider utilizing a plugin:
// constantsPlugin.js
const GLOBAL_CONSTANTS = {
CREATE_ACTION: 1,
UPDATE_ACTION: 2
...
}
let GlobalConstants = {}; // As per the recommendations in the comments.
GlobalConstants.install = function (Vue, options) {
Vue.prototype.$getConstant = (key) => {
return GLOBAL_CONSTANTS[key]
}
}
export default GlobalConstants
In your main.js file or wherever you instantiate new Vue(), make sure to include it like this:
import GlobalConstants from 'path/to/plugin'
Vue.use(GlobalConstants)
Now you can leverage this feature within a component template as shown below:
<div>
<select :disabled="mode === $getConstant('UPDATE_ACTION')">
</div>
Have you considered utilizing Mixins in your code? I find it to be a much cleaner way of structuring my code, though I'm not entirely certain if it's the best or recommended method.
data/actions.js
export const CREATE_ACTION = 1;
export const UPDATE_ACTION = 2;
export const actionsMixin = {
data() {
return {
CREATE_ACTION,
UPDATE_ACTION
}
}
}
MyComponent.vue
<template>
<div v-if="action === CREATE_ACTION">Something</div>
</template>
<script>
import {actionsMixin, CREATE_ACTION} from './data/actions.js';
export default {
mixins: [actionsMixin]
data() {
return {
action: CREATE_ACTION
}
}
}
</script>
<template>
<div v-if="CONSTANT_VALUE.foo">Content</div>
</template>
<script>
import {CONSTANT_VALUE} from './constants.js';
export default {
data() {
return {
CONSTANT_VALUE: Object.freeze(CONSTANT_VALUE) // prevents reactivity in Vue.js
}
}
}
</script>
Utilizing the power of Vue 3, you have the option to leverage the setup() function.
For instance:
<template>
<div>
Greetings {{ barConstant }}
</div>
</template>
<script>
const barConstant = "baz";
export default {
setup() {
return {
barConstant,
}
},
}
</script>
Alternatively, you can go all in with the Composition API approach:
<script setup>
const barConstant = "baz";
</script>
<template>
<div>
Greetings {{ barConstant }}
</div>
</template>
<template>
<div>
<p :style="{ color: $options.COLOR }">
{{$options.SALUTATION}} {{$options.RECIPIENT}}
</p>
</div>
</template>
<script>
const SALUTATION = 'Greetings!';
const COLOR = 'blue';
export default {
mounted() {
console.log('Welcome to the world');
},
COLOR,
SALUTATION,
RECIPIENT: 'Brave adventurer!',
}
</script>
In my experience, utilizing Mixins has proven to be an innovative method for implementing non-reactive constants in the Vue object.
To begin, establish your constants:
// Action.js
const Action = {
CREATE: 1,
UPDATE: 2
}
Action.Mixin = {
created () {
this.Action = Action
}
}
export default Action
Next, integrate these constants into the component:
<template>
<select :disabled="mode === Action.UPDATE">
</template>
<script>
import Action from './Action.js'
export default {
mixins: [Action.Mixin]
}
</script>
This approach blends aspects of Alessandro Benoit's and L. Palaiokostas' solutions seamlessly.
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