Vue.js 属性或方法“选项”未在实例上定义,但在渲染期间被引用
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【中文标题】Vue.js 属性或方法“选项”未在实例上定义,但在渲染期间被引用【英文标题】:Vue.js Property or method "options" is not defined on the instance but referenced during render 【发布时间】:2021-02-09 13:08:55 【问题描述】:我正在使用 Vue.js(和 Inertia.js),我想在我的表单中构建一个选择,但是编译后我的选择是空的,并且 Web 浏览器中的开发控制台向我抛出了这个错误:
属性或方法“选项”未在实例上定义,但在渲染期间被引用。通过初始化属性,确保此属性是反应性的,无论是在数据选项中,还是对于基于类的组件
请让我向您展示我的获取帮助的代码 - Index.vue:
<template>
<app-layout>
<div class="py-12">
<div class="max-w-7xl mx-auto sm:px-6 lg:px-8">
<div class="bg-white overflow-hidden shadow-xl sm:rounded-lg">
<div>
<div class="p-6 sm:px-20 bg-white border-b border-gray-200">
<div class="flex items-center justify-end mt-4">
<jet-application-logo class="block h-12 w-auto items-center mx-auto" />
</div>
<div>
<div class="max-w-7xl mx-auto py-10 sm:px-6 lg:px-8">
<jet-form-section @submitted="createInvestment">
<template #title>
Investment gateway
</template>
<template #form>
<div class="mx-auto text-center">
<jet-input-amount id="amount" type="number" name="amount" placeholder="Amount for invest" v-model="investmentForm.amount" />
<jet-input-error :message="investmentForm.error('amount')" class="mt-2" />
<select v-model="currency" name="currency" class="input-currency">
<option v-for="option in options" v-bind:value="option.value">
option.text
</option>
</select>
</div>
<div class="mx-auto text-center">
<jet-input id="card_number" type="email" name="card_number" placeholder="Card Number" v-model="investmentForm.paypal" />
<jet-input-error :message="investmentForm.error('card_number')" class="mt-2" />
</div>
<div class="mx-auto text-center nomad-slash">
<jet-input-card id="card_expiration_month" type="email" name="card_expiration_month" placeholder="MM" v-model="investmentForm.paypal" />
<jet-input-error :message="investmentForm.error('card_expiration_month')" class="mt-2" />
/
<jet-input-card id="card_expiration_year" type="email" name="card_expiration_year" placeholder="YY" v-model="investmentForm.paypal" />
<jet-input-error :message="investmentForm.error('card_expiration_year')" class="mt-2" />
<jet-input-card id="card_cvv" type="email" name="card_cvv" placeholder="CVV" v-model="investmentForm.paypal" />
<jet-input-error :message="investmentForm.error('card_cvv')" class="mt-2" />
</div>
</template>
<template #actions>
<jet-action-message :on="investmentForm.recentlySuccessful" class="mr-3">
Your money are on the way!
</jet-action-message>
<jet-button :class=" 'opacity-25': investmentForm.processing " :disabled="investmentForm.processing">
Invest
</jet-button>
<br /><br />
</template>
</jet-form-section>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</app-layout>
</template>
<script>
import JetActionMessage from './../../Jetstream/ActionMessage'
import JetFormSection from './../../Jetstream/FormSection'
import JetButton from './../../Jetstream/Button'
import JetInput from './../../Jetstream/Input'
import JetInputAmount from './../../Jetstream/InputAmount'
import JetInputCard from './../../Jetstream/InputCard'
import JetLabel from './../../Jetstream/Label'
import JetInputError from './../../Jetstream/InputError'
import JetApplicationLogo from './../../Jetstream/ApplicationLogo'
import AppLayout from "./../../Layouts/AppLayout";
export default
name: "Index",
components: AppLayout, JetInput, JetLabel, JetFormSection, JetButton, JetActionMessage, JetInputError, JetApplicationLogo, JetInputAmount, JetInputCard,
data()
return
investmentForm: this.$inertia.form(
amount: '',
currency: '',
options: [
text: '$ USD', value: 'usd' ,
text: 'R ZAR', value: 'zar' ,
text: '€ EUR', value: 'eur' ,
text: '£ GBP', value: 'gbp' ,
text: '₹ INR', value: 'inr' ,
text: '$ AUD', value: 'aud' ,
],
card_number: '',
card_expiration_month: '',
card_expiration_year: '',
card_cvv: '',
,
bag: 'createInvestment',
resetOnSuccess: false,
),
,
methods:
createInvestment()
this.investmentForm.post('/input/create',
preserveScroll: true,
);
</script>
<style scoped>
</style>
【问题讨论】:
【参考方案1】:在您的v-for
循环中,VueJS 试图在您的数据对象中找到options
键。您的选项在 investmentForm
键下,因此在您的 v-for 中,而不是
v-for="option in options"
你应该写
v-for="option in investmentForm.options"
您得到的错误只是意味着 Vue 不知道 options
是什么,因为它无法在任何地方找到它。
【讨论】:
【参考方案2】:options
在 investmentForm
数据内,因此您需要更新它
<option v-for="option in investmentForm.options" v-bind:value="option.value">
option.text
</option>
【讨论】:
【参考方案3】:options 在investForm 中,因此必须在模板中调用它,例如investForm.options。
已经给出的解决方案的替代方法是添加一个计算方法,这样您就不需要更改模板:
// ...
computed:
options()
return investmentForm.options;
,
// ...
【讨论】:
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