vue表单校验 100行小白自编

vue表单校验 100行小白自编

先上代码

两个文件，一个写逻辑，一个写校验规则；
特点：逻辑简单，代码量少，够用；
不想看代码直接新建这两个文件复制代码，看最下面的使用方法；

示例图片

//validator.js
//引入校验规则
var valitatorRules = require('./valitator-rules.js');

export const Validator=function(formName,rules,errors){
// rules：{
//     name:'required|regexp_hanzi',
//     idCont: 'regexp_I'
// }
this.rules = rules;
// let errors = {
//     name:{
//         required:'不能为空',
//         regexp_hanzi:'得是汉字'
//     },
//     idCont:{
//         regexp_I:'身份证号不对',
//         regexp_H:'香港通行证不对',
//         regexp_T:'台湾通行证不对',
//     }
// };
this.error = errors;
this.form = document.forms[formName];
this.validatorList = [];
this.init();
}
//初始化
Validator.prototype.init = function(){
for (let key in this.rules){
    let node = this.findNode(key);
    this.validatorList.push({
        name: key,
        value: '',
        childrenNode:node.childrenNode,
        parentNode: node.parentNode,
        borderColor:getComputedStyle(node.childrenNode).borderColor,
        ruleReg:this.defineRule(key),//[{rule:'hanzi',valitatorRules:fn(this.value),error:'请输入汉字'}]
        errors :'',
    })
}
};
//动态修改校验规则
Validator.prototype.changeRules = function(rules,param){
let arrs = Object.keys(rules);
this.rules = {
    ...this.rules,
    ...rules
}
this.validatorList.forEach(val => {
    if(arrs.includes(val.name)){
        val.ruleReg = this.defineRule(val.name)
    }
})
if(param){
    return this.validate(param)
}
};
//校验执行者
Validator.prototype.validate = function(param){
let errorList =[];
return new Promise((resolve,reject) => {
    for (let key in param){
        this.validatorList.forEach(val => {
            if(val.name == key){
                val.value = param[key];
                this.runValidator(val);
            }
        })
        
    }

    this.validatorList.forEach(val => {
        Object.keys(param).forEach(v => {
            if(val.name == v && val.errors){
                errorList.push(val);
            }
        })
    })
    if(errorList.length > 0){
        reject(this)
    }else{
        resolve()
    }
})
}
//暴露出的展示错误
Validator.prototype.showError = function(name){
if(name){
    let module;
    this.validatorList.forEach(val => {
        if(val.name == name){
            module = val;
        }
    })
    if(module.errors){
        this.createError(module);
    } 
    
}else{
    this.validatorList.forEach(val => {
        if(val.errors){
            this.createError(val);
        }
        
    }) 
}

}
//执行校验工具；
Validator.prototype.runValidator = function(module){

let n = 0;
function run(param){
   if (n>=module.ruleReg.length){
       return
   }
   if(param.valitatorRules(module.value)){// 验证通过
        module.errors = '';
        n++;
        run(module.ruleReg[n]);
       
    } else{
        module.errors = param.error;
   }
}    
run(module.ruleReg[n]);

if(module.errors.length == 0 && module.newChildNode){
    this.clear(module);
}
}
//寻找节点
Validator.prototype.findNode= function(childenName){
let form = this.form;
let childrenNode = form.querySelector(`input[name="${childenName}"]`) || form.querySelector(`textarea[name="${childenName}"]`);
let parentNode = childrenNode.parentNode;
return {
    childrenNode,
    parentNode
}
};
//寻找验证规则
Validator.prototype.defineRule =function(name){
let rule = [],ruleString='';
for(let key in this.rules){
    if(name == key){
        ruleString = this.rules[key];
    }
}
let arr= ruleString.split('|');

arr.forEach(val => {
    if(valitatorRules[val]){
        console.log(this)
        rule.push({
            rule:val,
            valitatorRules:valitatorRules[val],
            error:this.error[name][val]
        })
    }
})

return rule;
}
//生产错误提示
Validator.prototype.createError = function(module){
if(module.newChildNode){
    module.newChildNode.innerText = module.errors;
    return
}
let newChildNode = document.createElement('div');
newChildNode.className='_errorMessage';
newChildNode.style.color = 'red';
newChildNode.style.fontSize = '12px';
newChildNode.innerText = module.errors;
module.newChildNode = newChildNode;
module.childrenNode.style.borderColor = 'red';
if(module.childrenNode.nextSibling){
    module.parentNode.insertBefore(newChildNode,module.childrenNode.nextSibling);
}else{
    module.parentNode.appendChild(newChildNode);
}
}
//清除错误提示
Validator.prototype.clear = function(module){
if(module){
    module.childrenNode.style.borderColor = module.borderColor;
    module.parentNode.removeChild(module.newChildNode);
    module.newChildNode = null;
}else{
    this.validatorList.forEach(val => {
        if(val.newChildNode){
            val.childrenNode.style.borderColor = val.borderColor;
            val.parentNode.removeChild(val.newChildNode);
            val.newChildNode = null;
        }
    })
}
}

下面是校验规则，就更简单

说明一下，非空校验没有做单独处理，所以校验规则这里就多写个if else;

//validator-rule.js
module.exports= {
hanzi:function(str){
    if(str){
        let reg = /[\u4e00-\u9fa5]/;
        return reg.test(str);
    }else{
        return true;
    }
    
},
required:function(str){
    return !(str.length == 0)
},
I:function(str){
    if(str){
        let reg = /i/;
        return reg.test(str);
    }else{
        return true;
    }
},
H:function(str){
    if(str){
        let reg = /h/;
        return reg.test(str);
    }else{
        return true;
    }
},
T:function(str){
    if(str){
        let reg = /t/;
        return reg.test(str);
    }else{
        return true;
    }
},
}

使用方法

**引入校验插件 import {Validator} from '@src/utils/valitator'**
    **校验规则可自行修改添加  @src/utils/valitator-rules**
    ****
    1.添加form  name属性<form name='example_form'></form>
    2.定义错误提示errors = {
        name:{
            required:'不能为空',
            hanzi:'得是汉字'
        },
        idCont:{
            I:'身份证号不对',
            H:'香港通行证不对',
            T:'台湾通行证不对',
        }
    };
    3.定义校验规则rules ={
        name:'required|hanzi',
        idCont: 'I'
    }
    4.初始化校验实例：this.Validator =new Validator('example_form',rules,errors);
    5.绑定校验信息：input增加name属性，保持和错误提示key一致  <input type="text" name='name' v-model='name'>
    6.执行校验：传入要校验的key和value; 
    this.Validator.validate({
        [name]:this[name],
    }).then(()=>{ 

    }).catch((errorCb)=>{
        console.log(errorCb)
        errorCb.showError();//展示错误提示，如果只展示某个提示，传入对应的值errorCb.showError('name')
    });
    7.动态跟换校验规则，如证件类型更换：
    this.Validator.changeRules(
        {idCont:this.idType},//传入新的校验规则
        {idCont:this.idCont})//传入校验的key和value进行校验
        .then(()=>{

        }).catch((errorCb)=>{
        errorCb.showError('idCont');
    })；
    8：注意事项：每个input要用div包起来，保证错误信息位置正确添加；
    this.Validator.clear()；清空所有错误提示