总结elementUI表单验证的踩坑解决方法

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本篇文章给大家带来了关于elementui的相关知识，其中主要跟大家聊一聊我在实现elementui的表单验证时都遇到哪些坑，顺便记录分享一下？感兴趣的朋友下面一起来看一下吧，希望对大家有帮助。

最近做了一个需要表单填写的项目，需要做很多表单验证工作，学到了新知识，为了避免以后会踩到同样的坑，就在这里记录起来。 

我总结之后，有四个要注意：

1.在v-for的列表下，form表单的验证该如何精确触发2.对list进行增删操作的时候，如何确保视图正确更新3.自定义验证规则的时候，如何知道操作的数据在数据结构中的准确位置4.对象深层的key验证该如何触发

这是要操作的列表：

  
         <el-form-item              :label="keytolabel(subkey)"              v-for="(subItem, subkey) in item"              :key="subkey"              :prop="`boxList.${index}.${subkey}`"           

第一个问题的解决方案：

我们在遍历form-item的时候，就需要prop属性，根据官方文档的说明，prop是表单域 model 字段，在使用 validate、resetFields 方法的情况下，该属性是必填的。正是这个属性，可以让组件知道触发的时机。其中的触发逻辑没有去深入研究。

  :prop="`boxList.${index}.${subkey}`"

在rules这里sybkey要和rules的key值对应上才可以正常触发

     rules: {        screenlength: [{ validator: lengthhandler, trigger: "blur" }],       }

如上述所示，根据list的数量进行遍历行数，再根据item来遍历列数。每一列都有不定数量的key值，那么在这里的我们需要给prop指定到准确的位置，大概模式就是父key.行数.列key，简单地来说，就是要将这个值所在的数据结构位置告诉element组件。

根据我的猜测，element表单组件触发验证的逻辑是监听这个值的变化，根据给定的触发条件（change，input，blur，focus等等），符合触发条件就去对比是否发生值的变化，然后根据验证规则去做相应的提示。

第二个问题的解决方案：

我们在遍历form-item的时候,vue会要求必须有一个key，这样可以正确更新视图。那么这一个key最大的特点是要操持唯一。我的方案是给key值生成一个唯一id，或者new Date().getTime()生成一个时间戳，当我们对列表进行操作的时候，就会正确更新视图了。

例如：当我们触发第一和第二的item验证的时候

再去删除第二个item，视图就会在删除之后，验证提示会删除

如果不是唯一key，例如使用index做key值，那么这个key是不会变化的，删除第二个item就会出现以下情况

BibiGPT-哔哔终结者

B站视频总结器-一键总结 音视频内容

28 查看详情

当发生这种情况的时候，你应该考虑的是vue的视图更新规则

第三个问题的解决方案：

自定义验证规则在官方文档有详细的说明，这一块就不用细说了，但是里面的触发逻辑需要根据情况来修改代码。例如总数是根据前面的长和高相乘公式得出的，那么我们需要每次在长和高的值变化的时候，就需要去计算总数，然后根据规则去进行提示。

设置一个currentIndex，在长和高的输入框组件上定义focus事件，每次触发就说明输入框在操作，这一行就被操作的一行数据，那么在定义验证的时候就知道是哪一行了

  // 在组件focus的时候,就说明想操作这个组件,提前将位置记录,以便于数据验证    focus(data) {      this.currentIndex = data.index;    },

当然，代码还是要根据具体交互来编写

第四个问题的解决方案：

很多时候，我们都只是对表层key进行验证，所以如果需要验证对象的深层可以的时候，我们需要做特殊处理，和第一个问题的处理方式类似，但又不完全相同。

// 要验证的数据结构：    formData：{        sendcard：{        sendcardsource：""        }    }    //prop：组件属性                        //rules:规则设置        rules: {        // 发送卡        "sendcard.sendcardsource": [commonRule],        }

这里的特点就是需要在rules属性定义一个验证验证规则，prop的值要跟rules的值对应上才可以触发。这里的特点是，对象和对象的可能会有相同的key，所以这样做是可以在rules设置一个唯一的触发key值。

总结：

其实我有个疑问，第一个问题和第四个问题的解决是不是可以用同一种解决方式的？

推荐学习：《JavaScript视频教程》《vue.js视频教程》

以上就是总结elementUI表单验证的踩坑解决方法的详细内容，更多请关注创想鸟其它相关文章！