为保存在 Vuex 存储库中的表单字段启用双向数据绑定
Enable two-way data binding for form fields saved in a Vuex store.
npm install --save vuex-map-fieldsThe following example component shows the most basic usage, for mapping fields to the Vuex store using two-way data binding with v-model, without directly modifying the store itself, but using getter and setter functions internally (as it is described in the official Vuex documentation: Two-way Computed Property).
import Vue from 'vue';
import Vuex from 'vuex';
// Import the `getField` getter and the `updateField`
// mutation function from the `vuex-map-fields` module.
import { getField, updateField } from 'vuex-map-fields';
Vue.use(Vuex);
export default new Vuex.Store({
state: {
fieldA: '',
fieldB: '',
},
getters: {
// Add the `getField` getter to the
// `getters` of your Vuex store instance.
getField,
},
mutations: {
// Add the `updateField` mutation to the
// `mutations` of your Vuex store instance.
updateField,
},
});<template>
</template>
<script>
import { mapFields } from 'vuex-map-fields';
export default {
computed: {
// The `mapFields` function takes an array of
// field names and generates corresponding
// computed properties with getter and setter
// functions for accessing the Vuex store.
...mapFields([
'fieldA',
'fieldB',
]),
},
};
</script>Oftentimes you want to have nested properties in the Vuex store. vuex-map-fields supports nested data structures by utilizing the object dot string notation.
import Vue from 'vue';
import Vuex from 'vuex';
import { getField, updateField } from 'vuex-map-fields';
Vue.use(Vuex);
export default new Vuex.Store({
state: {
user: {
firstName: '',
lastName: '',
},
addresses: [
{
town: '',
},
],
},
getters: {
getField,
},
mutations: {
updateField,
},
});<template>
</template>
<script>
import { mapFields } from 'vuex-map-fields';
export default {
computed: {
// When using nested data structures, the string
// after the last dot (e.g. `firstName`) is used
// for defining the name of the computed property.
...mapFields([
'user.firstName',
'user.lastName',
// It's also possible to access
// nested properties in arrays.
'addresses[0].town',
]),
},
};
</script>Sometimes you might want to give your computed properties different names than what you're using in the Vuex store. Renaming properties is made possible by passing an object of fields to the mapFields function instead of an array.
<template>
</template>
<script>
import { mapFields } from 'vuex-map-fields';
export default {
computed: {
...mapFields({
userFirstName: 'user.firstName',
userLastName: 'user.lastName',
}),
},
};
</script>By default vuex-map-fields is searching for the given properties starting from the root of your state object. Depending on the size of your application, the state object might become quite big and therefore updating the state starting from the root might become a performance issue. To circumvent such problems, it is possible to create a custom mapFields() function which is configured to access custom mutation and getter functions which don't start from the root of the state object but are accessing a specific point of the state.
……Vuex makes it possible to divide the store into modules.
…<template>
</template>
<script>
import { createHelpers } from 'vuex-map-fields';
// We're using the same getter and mutation types
// as we've used in the store above.
const { mapFields } = createHelpers({
getterType: 'getFooField',
mutationType: 'updateFooField',
});
export default {
computed: {
...mapFields(['foo']),
},
};
</script>By default, mutations and getters inside modules are registered under the global namespace – but you can mark modules as namespaced which prevents naming clashes of mutations and getters between modules.
import Vue from 'vue';
import Vuex from 'vuex';
import { getField, updateField } from 'vuex-map-fields';
Vue.use(Vuex);
export default new Vuex.Store({
// ...
modules: {
fooModule: {
namespaced: true,
state: {
foo: '',
},
getters: {
getField,
},
mutations: {
updateField,
},
},
},
});<template>
</template>
<script>
import { createHelpers } from 'vuex-map-fields';
// `fooModule` is the name of the Vuex module.
const { mapFields } = createHelpers({
getterType: 'fooModule/getField',
mutationType: 'fooModule/updateField',
});
export default {
computed: {
...mapFields(['foo']),
},
};
</script>Or you can pass the module namespace string as the first argument of the mapFields() function.
<template>
</template>
<script>
import { mapFields } from 'vuex-map-fields';
export default {
computed: {
// `fooModule` is the name of the Vuex module.
...mapFields('fooModule', ['foo']),
},
};
</script>If you want to build a form which allows the user to enter multiple rows of a specific data type with multiple fields (e.g. multiple addresses) you can use the multi-row field mapping function.
import Vue from 'vue';
import Vuex from 'vuex';
import { getField, updateField } from 'vuex-map-fields';
Vue.use(Vuex);
export default new Vuex.Store({
// ...
state: {
addresses: [
{
zip: '12345',
town: 'Foo Town',
},
{
zip: '54321',
town: 'Bar Town',
},
],
},
getters: {
getField,
},
mutations: {
updateField,
},
});<template>
</div>
</template>
<script>
import { mapMultiRowFields } from 'vuex-map-fields';
export default {
computed: {
...mapMultiRowFields(['addresses']),
},
};
</script>Instead of accessing the state directly, since the 1.0.0 release, in order to enable the ability to implement custom getters and mutations, vuex-map-fields is using a getter function to access the state. This makes it necessary to add a getter function to your Vuex store.
import Vue from 'vue';
import Vuex from 'vuex';
// You now have to also import the `getField()` function.
import { getField, updateField } from 'vuex-map-fields';
Vue.use(Vuex);
export default new Vuex.Store({
state: {
fieldA: '',
fieldB: '',
},
getters: {
// Add the `getField` getter to the
// `getters` of your Vuex store instance.
getField,
},
mutations: {
updateField,
},
});Become a sponsor and get your logo in this README with a link to your site.
Markus Oberlehner
Website: https://markus.oberlehner.net
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