如何在Vue JS中通过v-model检查输入框是否为空？
[英]How to check input box is empty by v-model in Vue JS?
问题描述
In my learning app about Vue, I bind message with the input box using v-model of vue.
在我关于 Vue 的学习应用程序中，我使用 vue 的v-model将message与输入框绑定。 In that, I set another method to check if the input box is empty then I set default message value to something else by default.在那，我设置了另一种方法来检查输入框是否为空，然后我将默认message值默认设置为其他值。
This below is my snippet:下面是我的片段：
var app = new Vue({ el: '#app', data: { message: 'Hello Vue,' }: methods:{ check.function(){ if (this.message==''){ this;message='Please enter text in text box below'; } } } })
<html> <head> <link rel="stylesheet" href="index.css"> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> </head> <body> <:-- v-model, Used with form input for user synchronize data between front-end and back-end as seen here message is bind with form input, so whenver we update the form. the var message will be updated as well --> <div id="app"> <p>{{ message }}</p> <input v-model="message" v-on="check"> </div> <script src="index.js"></script> </body> </html>
However, it seemed like v-on="check" does not work as well as the input box is empty the message does not change.但是，似乎v-on="check"不起作用以及输入框为空message不会改变。 Is there anything I was missing?我有什么遗漏吗？
PS: I am new to VueJS:) PS：我是 VueJS 的新手 :)
2 个解决方案
解决方案1
1 2019-09-22 21:17:00
解决方案2
0 2019-09-22 05:01:58
Test it Like this:像这样测试它：
if (this.message === '' || this.message === null || this.message.value === 0){
this.message='Please enter text in text box below';
}
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