feat(Form): support async validation

src/field/index.js

@@ -3,7 +3,7 @@ import { formatNumber } from './utils';
 import { isIOS } from '../utils/validate/system';
 import { preventDefault } from '../utils/dom/event';
 import { resetScroll } from '../utils/dom/reset-scroll';
-import { createNamespace, isObject, isDef, addUnit } from '../utils';
+import { createNamespace, isObject, isDef, addUnit, isPromise } from '../utils';
 
 // Components
 import Icon from '../icon';
@@ -151,21 +151,30 @@ export default createComponent({
           resolve();
         }
 
-        const messages = [];
-
-        this.rules.forEach(rule => {
+        Promise.all(
+          this.rules.map(rule => {
             if (rule.required && this.formValueEmpty) {
-            messages.push(rule.message);
+              return Promise.resolve(rule.message);
             }
 
             if (rule.validator) {
-            const result = rule.validator(this.formValue);
+              const returnVal = rule.validator(this.formValue);
 
-            if (!result) {
-              messages.push(rule.message);
+              if (returnVal === false) {
+                return Promise.resolve(rule.message);
+              }
+
+              if (isPromise(returnVal)) {
+                return returnVal.then(
+                  result => result === false && rule.message
+                );
               }
             }
-        });
+
+            return Promise.resolve();
+          })
+        ).then(messages => {
+          messages = messages.filter(item => item);
 
           if (messages.length) {
             this.validateMessage = messages[0];
@@ -177,6 +186,7 @@ export default createComponent({
             resolve();
           }
         });
+      });
     },
 
     resetValidate() {

src/form/README.md

@@ -52,6 +52,43 @@ export default {
 }
 ```
 
+### Validate Rules
+
+```html
+<van-form @submit="onSubmit" @failed="onFailed">
+  <van-field
+    v-model="value"
+    name="phone"
+    label="Phone"
+    :rules="rules"
+    placeholder="Phone"
+  />
+  <div style="margin: 16px;">
+    <van-button round block type="info">Submit</van-button>
+  </div>
+</van-form>
+```
+
+```js
+export default {
+  data() {
+    this.rules = [
+      { required: true, message: 'Phone is required' },
+      { validator: val => /1\d{10}/.test(val), message: 'Incorrect format' },
+    ];
+    return { value: '' };
+  },
+  methods: {
+    onSubmit(values) {
+      console.log('submit', values);
+    },
+    onFailed(errorInfo) {
+      console.log('failed', errorInfo);
+    },
+  },
+};
+```
+
 ### Field Type - Switch
 
 ```html

src/form/README.zh-CN.md

@@ -60,17 +60,16 @@ export default {
 
 ### 校验规则
 
-在`rules`中，可以通过`validator`字段定义校验函数，校验函数返回`false`时表示校验不通过
+在`rules`中，可以通过`validator`字段定义校验函数，校验函数返回`false`时表示校验不通过，返回`Promise`时表示异步校验
 
 ```html
-<van-form>
+<van-form @submit="onSubmit" @failed="onFailed">
   <van-field
     v-model="value"
+    name="phone"
     label="手机号"
     :rules="rules"
     placeholder="手机号"
-    @submit="onSubmit"
-    @failed="onFailed"
   />
   <div style="margin: 16px;">
     <van-button round block type="info">提交</van-button>

src/form/demo/ValidateRules.vue

@@ -1,13 +1,19 @@
 <template>
   <demo-block :title="$t('title')">
-    <van-form>
+    <van-form validate-first @sumbit="onSubmit" @failed="onFailed">
       <van-field
-        v-model="value"
+        v-model="phone"
+        name="phone"
         :label="$t('phone')"
-        :rules="rules"
+        :rules="rules.phone"
         :placeholder="$t('phone')"
-        @submit="onSubmit"
-        @failed="onFailed"
+      />
+      <van-field
+        v-model="code"
+        name="code"
+        :label="$t('code')"
+        :rules="rules.code"
+        :placeholder="$t('code')"
       />
       <div style="margin: 16px 16px 0;">
         <van-button type="info" round block>{{ $t('submit') }}</van-button>
@@ -20,35 +26,57 @@
 export default {
   i18n: {
     'zh-CN': {
+      code: '验证码',
       phone: '手机号',
       title: '校验规则',
       submit: '提交',
       required: '请输入手机号',
-      incorrectFormat: '手机号格式错误',
+      validating: '验证中...',
+      incorrectCode: '验证码错误',
+      incorrectPhone: '手机号格式错误',
     },
     'en-US': {
+      code: 'Code',
       phone: 'Phone',
       title: 'Validate Rules',
       submit: 'Submit',
-      required: 'Phone is required',
-      incorrectFormat: 'Incorrect format',
+      validating: 'Validating...',
+      incorrectCode: 'Incorrect code',
+      incorrectPhone: 'Incorrect phone',
     },
   },
 
   data() {
     return {
-      value: '',
+      code: '',
+      phone: '',
     };
   },
 
   created() {
-    this.rules = [
+    this.rules = {
+      phone: [
         { required: true, message: this.$t('required') },
         {
           validator: val => /1\d{10}/.test(val),
-        message: this.$t('incorrectFormat'),
+          message: this.$t('incorrectPhone'),
         },
-    ];
+      ],
+      code: [
+        {
+          validator: val =>
+            new Promise(resolve => {
+              this.$toast.loading(this.$t('validating'));
+
+              setTimeout(() => {
+                this.$toast.clear();
+                resolve(/\d{6}/.test(val));
+              }, 1000);
+            }),
+          message: this.$t('incorrectCode'),
+        },
+      ],
+    };
   },
 
   methods: {

src/utils/test/index.spec.js

@@ -76,14 +76,14 @@ test('raf', async () => {
   cancelRaf(1);
 });
 
-test('is-email', () => {
+test('isEmail', () => {
   expect(isEmail('abc@gmail.com')).toBeTruthy();
   expect(isEmail('abc@@gmail.com')).toBeFalsy();
   expect(isEmail('@gmail.com')).toBeFalsy();
   expect(isEmail('abc@')).toBeFalsy();
 });
 
-test('is-mobile', () => {
+test('isMobile', () => {
   expect(isMobile('13000000000')).toBeTruthy();
   expect(isMobile('+8613000000000')).toBeTruthy();
   expect(isMobile('8613000000000')).toBeTruthy();
@@ -91,7 +91,7 @@ test('is-mobile', () => {
   expect(isMobile('abc')).toBeFalsy();
 });
 
-test('is-number', () => {
+test('isNumeric', () => {
   expect(isNumeric('1')).toBeTruthy();
   expect(isNumeric('1.2')).toBeTruthy();
   expect(isNumeric('1..2')).toBeFalsy();