elementUI 中 Form 组件提供了表单验证的功能，只需要通过 rules 属性传入约定的验证规则，并将 Form-Item 的 prop 属性设置为需校验的字段名即可。
（1）常用表单验证
<template>
<el-form :model="ruleForm" :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
<el-form-item label="活动名称" prop="user">
<el-input v-model="ruleForm.user"></el-input>
</el-form-item>
<el-form-item label="活动名称" prop="password">
<el-input v-model="ruleForm.password"></el-input>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="submitForm('ruleForm')">登录</el-button>
<el-button @click="resetForm('ruleForm')">重置</el-button>
</el-form-item>
</el-form>
</template>
<script>
export default {
data() {
return {
ruleForm: {
user: '',
password: '',
},
rules: {
user: [
{ required: true, message: '请输入账号', trigger: 'blur' },
{ min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
],
password: [
{ required: true, message: '请输入密码', trigger: 'change' },
{ min: 8, max: 16, message: '长度在 8 到 16 个字符', trigger: 'blur' }
],
}
};
},
methods: {
submitForm(formName) {
this.$refs[formName].validate((valid) => {
if (valid) {
alert('submit!');
} else {
console.log('error submit!!');
return false;
}
});
},
resetForm(formName) {
this.$refs[formName].resetFields();
}
}
}
</script>
（2）自定义验证规则（关键字：validator）
有些需要自定义的校验规则可以作为变量写在data中，然后赋值给validator字段
<template>
<el-form :model="ruleForm" status-icon :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
<el-form-item label="密码" prop="pass">
<el-input type="password" v-model="ruleForm.pass" autocomplete="off"></el-input>
</el-form-item>
<el-form-item label="确认密码" prop="checkPass">
<el-input type="password" v-model="ruleForm.checkPass" autocomplete="off"></el-input>
</el-form-item>
<el-form-item label="年龄" prop="age">
<el-input v-model.number="ruleForm.age"></el-input>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="submitForm('ruleForm')">提交</el-button>
<el-button @click="resetForm('ruleForm')">重置</el-button>
</el-form-item>
</el-form>
</template>
<script>
export default {
data() {
var checkAge = (rule, value, callback) => {
if (!value) {
return callback(new Error('年龄不能为空'));
}
setTimeout(() => {
if (!Number.isInteger(value)) {
callback(new Error('请输入数字值'));
} else {
if (value < 18) {
callback(new Error('必须年满18岁'));
} else {
callback();
}
}
}, 1000);
};
var validatePass = (rule, value, callback) => {
if (value === '') {
callback(new Error('请输入密码'));
} else {
if (this.ruleForm.checkPass !== '') {
this.$refs.ruleForm.validateField('checkPass');
}
callback();
}
};
var validatePass2 = (rule, value, callback) => {
if (value === '') {
callback(new Error('请再次输入密码'));
} else if (value !== this.ruleForm.pass) {
callback(new Error('两次输入密码不一致!'));
} else {
callback();
}
};
return {
ruleForm: {
pass: '',
checkPass: '',
age: ''
},
rules: {
pass: [
{ required: true, validator: validatePass, trigger: 'blur' }
],
checkPass: [
{ required: true, validator: validatePass2, trigger: 'blur' }
],
age: [
{ required: true, validator: checkAge, trigger: 'blur' }
]
}
};
},
methods: {
submitForm(formName) {
this.$refs[formName].validate((valid) => {
if (valid) {
alert('submit!');
} else {
console.log('error submit!!');
return false;
}
});
},
resetForm(formName) {
this.$refs[formName].resetFields();
}
}
}
</script>
（3）动态表单验证
实际开发中很常见的需求，此时用rules、prop直接写就对应不上表单mode绑定的对象上的属性，所以需要用循环的方式找到要校验的字段所在数据中的索引，然后再以字符串拼接的方式连上校验字段名称：
<template>
<div class="container">
<el-form :model="form" ref="formRef" label-width="100px">
<el-form-item
prop="email"
label="邮箱"
:rules="[
{ required: true, message: '请输入邮箱地址', trigger: 'blur' },
{ type: 'email', message: '请输入正确的邮箱地址', trigger: ['blur', 'change'] }
]">
<el-input v-model="form.email"></el-input>
</el-form-item>
<el-form-item class="line-item"
v-for="(item, index) in form.domains"
:label="'域名' + index"
:key="item.key"
:prop="'domains.' + index + '.value'"
:rules="{
required: true, message: '域名不能为空', trigger: 'blur'
}">
<el-input v-model="item.value"></el-input>
<el-button @click.prevent="removeDomain(index)">删除</el-button>
</el-form-item>
<el-form-item>
<el-button type="primary" @click="submitForm('formRef')">提交</el-button>
<el-button @click="addDomain">新增域名</el-button>
<el-button @click="resetForm('formRef')">重置</el-button>
</el-form-item>
</el-form>
</div>
</template>
<script>
export default {
data() {
return {
form: {
domains: [{
value: ''
}],
email: ''
}
};
},
methods: {
submitForm(formName) {
this.$refs[formName].validate((valid) => {
if (valid) {
alert('submit!');
} else {
console.log('error submit!!');
return false;
}
});
},
resetForm(formName) {
this.$refs[formName].resetFields();
},
removeDomain(index) {
this.form.domains.splice(index, 1)
},
addDomain() {
this.form.domains.push({
value: '',
key: Date.now()
});
}
}
}
</script>
<style scoped>
.container{
height: 100%;
background-color: #fff;
padding: 20px 100px;
.line-item{
/deep/.el-form-item__content{
display: flex;
}
}
}
</style>