uview表单 hooks

在UViewUI库中，使用hooks封装表单二次可以让我们以更灵活的方式使用表单组件。下面是一个示例，展示如何将表单封装成hooks，并以JSON形式传递参数：
首先，我们可以创建一个自定义的Hook来处理表单逻辑。在这个例子中，我们创建了一个名为useFormData的Hook，它接收一个JSON对象作为参数，该对象包含了表单数据、表单项的配置等。

<script>import {ref , reactive} from 'vue';// 定义一个自定义 Hookconst useFormData = (formConfig) => {const formData = reactive(formConfig.initialValues);const formErrors = reactive({});const validateField = (fieldName) => {const field = formConfig.fields[fieldName];if (!field) return false;const value = formData[fieldName];const validationResult =field.validator(value);if (!validationResult) {formErrors[fieldName] = field.errorMsg;} else {deleteformErrors[fieldName];}return validationResult;};const validateForm = () => {let isValid = true;Object.keys(formConfig.fields).forEach((fieldName) => {isValid = validateField(fieldName) && isValid;});returnisValid;};const setFieldValue = (fieldName, value) => {formData[fieldName] = value;delete formErrors[fieldName];};const getFieldValue = (fieldName) => {return formData[fieldName];};return {formData,formErrors,validateField,validateForm,setFieldValue,getFieldValue,};}
</script>

接下来，我们可以使用useFormData Hook 来创建表单组件。在组件中，我们可以通过传递一个JSON对象作为参数来配置表单。以下是一个示例：

<template><u-form :model="formData" :rules="formConfig.rules"><u-form-item v-for="field in formConfig.fields" :key="field.name" :label="field.label" :prop="field.name"><template v-slot="{ item }"><u-input v-model="item.value" :placeholder="item.label"></u-input></template></u-form-item><u-button :disabled="!canSubmit" @click="submitForm">Submit</u-button></u-form>
</template><script>
import { useFormData } from './useFormData';
export default {setup() {const formConfig = {initialValues: {username: '',password: '',},rules: {username: [{ required: true, message: 'Username is required', trigger: 'blur' },],password: [{ required: true, message: 'Password is required', trigger: 'blur' },],},fields: {username: {name: 'username',label: 'Username',},password: {name: 'password',label: 'Password',},},};const { formData, validateForm, setFieldValue, getFieldValue } = useFormData(formConfig);const canSubmit = ref(true);const submitForm = () => {if (validateForm()) {console.log('Form data:', formData); // 在这里可以处理表单提交的逻辑，比如发送到服务器等操作。} else {canSubmit.value = false; }};}
};
</script>