概述
通过ref获取DOM节点也是一种非常常见的用法。
最常见的地方就是表单提交的时候,我们经常会给表单绑定一个ref,在条件之前通过ref获取表单数据,并校验表单数据是否正确。
在本节课中,我们使用ref引用一个textarea文本域,同事实记录文本域中的段落数量,句子数量和单词数量。
本节课需要依赖一个第三方库,我们先安装:
bash
yarn add countable
基本用法
我们创建src/components/Demo34.vue,代码如下:
html
<script setup>
import * as Countable from 'countable'
import {onMounted, ref} from "vue";
const count = ref({})
const textAreaRef = ref(null)
onMounted(() => {
Countable.on(textAreaRef.value, (value) => {
count.value = value
})
})
</script>
<template>
<!--段落-->
<textarea
ref="textAreaRef"
cols="50"
rows="7"
>
</textarea>
<!--段落计数-->
<ul>
<li>段落: {{ count.paragraphs }}</li>
<li>句子: {{ count.sentences }}</li>
<li>单词: {{ count.words }}</li>
</ul>
</template>
接着,我们修改src/App.vue:
html
<script setup>
import Demo from "./components/Demo34.vue"
</script>
<template>
<h1>欢迎跟着Python私教一起学习Vue3入门课程</h1>
<hr>
<demo/>
</template>
然后,我们浏览器访问:http://localhost:5173/
完整代码
package.json
json
{
"name": "hello",
"private": true,
"version": "0.0.0",
"type": "module",
"scripts": {
"dev": "vite",
"build": "vite build",
"preview": "vite preview"
},
"dependencies": {
"countable": "^3.0.1",
"vue": "^3.3.8"
},
"devDependencies": {
"@vitejs/plugin-vue": "^4.5.0",
"vite": "^5.0.0"
}
}
vite.config.js
js
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
export default defineConfig({
plugins: [vue()],
})
index.html
html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<link rel="icon" type="image/svg+xml" href="/vite.svg" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Vite + Vue</title>
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/main.js"></script>
</body>
</html>
src/main.js
js
import { createApp } from 'vue'
import App from './App.vue'
createApp(App).mount('#app')
src/App.vue
html
<script setup>
import Demo from "./components/Demo34.vue"
</script>
<template>
<h1>欢迎跟着Python私教一起学习Vue3入门课程</h1>
<hr>
<demo/>
</template>
src/components/Demo34.vue
html
<script setup>
import * as Countable from 'countable'
import {onMounted, ref} from "vue";
const count = ref({})
const textAreaRef = ref(null)
onMounted(() => {
Countable.on(textAreaRef.value, (value) => {
count.value = value
})
})
</script>
<template>
<!--段落-->
<textarea
ref="textAreaRef"
cols="50"
rows="7"
>
</textarea>
<!--段落计数-->
<ul>
<li>段落: {{ count.paragraphs }}</li>
<li>句子: {{ count.sentences }}</li>
<li>单词: {{ count.words }}</li>
</ul>
</template>
启动方式
bash
yarn
yarn dev
浏览器访问:http://localhost:5173/