如何解决输入值的问题？

Question

我有一个post.title和post.body的值，我需要在更改文本输入框中的值后将其保存在数据中，以便稍后为用户编写（PUT请求）API时使用这些新值。我该如何实现？

以下是我的代码 -

<template>
    <div id="app">
        <input type="text" v-model="createTitle" />
        <input type="text" v-model="createBody" />
        <button @click="addPost()">AddPost</button>
        <ul>
            <li v-for="(post, index) of posts">
                <p>{{ post.title }}</p>
                <p>{{ post.body }}</p>
                <button @click="deleteData(index, post.id)">Delete</button>
                <button @click="visiblePostID = post.id">
                    Изменить
                </button>
                <transition v-if="visiblePostID === post.id">
                    <p><input :value="post.title"><br><input :value="post.body">
                        <button type="button" @click="changePost(post.id, post.title, post.body)">Применить</button></p>
                </transition>
            </li>
        </ul>
    </div>
</template>
<script>
import axios from 'axios';

export default {
    name: 'app',
    data() {

        return {
            posts: [],
            createTitle: '',
            createBody: '',
            visiblePostID: '',

        }
    },
    changePost(id, title, body) {
        axios.put('http://jsonplaceholder.typicode.com/posts/' + id, {
            title: title,
            body: body
        })
    }
}
</script>

- Andrey Belichenko

Answer 1

如果要进行双向数据绑定，您应该使用v-model。在这里阅读更多信息。

<transition v-if="visiblePostID === post.id">
  <p>
    <input v-model="post.title">
    <br>
    <input v-model="post.body">
    
    <button type="button" @click="changePost(post.id, post.title, post.body)">Применить</button>
  </p>
</transition>

- Riddhi

Answer 2

为了补充@Riddhi的回答，您可以在这些输入上使用v-model和临时变量，这样只有在PUT请求成功确认后，模型才会被修改：

1. Add temporary data properties to hold the <input> values from the template:

   // template
   <transition v-if="visiblePostID === post.id">
     <input v-model="tmpTitle" />
     <input v-model="tmpBody" />
   </transition>
   
   // script
   data() {
     return {
       tmpTitle: '',
       tmpBody: ''
     }
   }
   

2. Replace the edit-button's handler with a method (named editPost()), and pass to the method the current post's ID, title, and body, which will be stored in the temporary data properties declared above:

   // template
   <button @click="editPost(post.id, post.title, post.body)">
     Изменить
   </button>
   
   // script
   methods: {
     editPost(id, title, body) {
       this.tmpTitle = title;
       this.tmpBody = body;
       this.visiblePostID = id;
     }
   }
   

3. Update changePost() to also take the current post, which will be updated with the temporary data properties once the PUT request is successful.

   // template
   <button type="button" @click="changePost(post, post.id, tmpTitle, tmpBody)">
     Применить
   </button>
   
   // script
   methods: {
     async changePost(post, id, title, body) {
       const { status } = await axios.put("https://jsonplaceholder.typicode.com/posts/" + id, { title: title, body: body });
       if (status === 200 /* HTTP OK */) {
         post.title = title;
         post.body = body;
       }
     }
   }
   

demo

可以翻译为：在HTML中插入链接，链接的名称为“demo”。

- tony19