Recently, web-view was used in a small program project, and the H5 carried by the web-view needed to communicate with the small program. There was a big pitfall, so write about the implementation process and how to avoid the pitfall.
1. The applet transfers parameters to the H5 hosted by the web-view, just add the parameters directly after the url ( xxxxx.com )
2. H5 sends a message to the applet
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Create a template html in the root directory of the uniapp project
2. Then introduce the WeChat SDK and uni SDK into the template html; note that there is a trap, the official SDK link provided by uniapp is wrong (it’s been a long time for me) , use this: https://js.cdn.aliyun.dcloud .net.cn/dev/uni-app/uni.webview.1.5.2.js , the template html code is as follows
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>
<%= htmlWebpackPlugin.options.title %>
</title>
<!-- Open Graph data -->
<!-- <meta property="og:title" content="Title Here" /> -->
<!-- <meta property="og:url" content="http://www.example.com/" /> -->
<!-- <meta property="og:image" content="http://example.com/image.jpg" /> -->
<!-- <meta property="og:description" content="Description Here" /> -->
<script>
var coverSupport = 'CSS' in window && typeof CSS.supports === 'function' && (CSS.supports('top: env(a)') || CSS.supports('top: constant(a)'))
document.write('<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0' + (coverSupport ? ', viewport-fit=cover' : '') + '" />')
</script>
<link rel="stylesheet" href="<%= BASE_URL %>static/index.<%= VUE_APP_INDEX_CSS_HASH %>.css" />
</head>
<body>
<noscript>
<strong>Please enable JavaScript to continue.</strong>
</noscript>
<div id="app"></div>
<!-- built files will be auto injected -->
</body>
<!-- 可更换，两个SDK都可使用最近更新的版本 -->
<!-- 微信 JS-SDK 如果不需要兼容小程序，可以不引用 JS 文件。 两个文件同时引入时，微信的需要在前-->
<script type="text/javascript" src="//res.wx.qq.com/open/js/jweixin-1.4.0.js"></script>
<!-- uni 的 SDK，必须引用。 -->
<script type="text/javascript" src="https://js.cdn.aliyun.dcloud.net.cn/dev/uni-app/uni.webview.1.5.2.js"></script>
<script>
//执行UniAppJSBridgeReady，通过后才可调用uni的api
document.addEventListener('UniAppJSBridgeReady', function() {
console.log(uni)
console.log('uni.webView', uni.webView)
uni.webView.getEnv(function(res) {
console.log('当前环境：' + JSON.stringify(res));
});
});
</script>
</html>3. Introduce the template html you created in manifest.json
4. Then you can use it on your page
<template>
<view class="layout">
<view class="content">
<view class="footer-box">
<view class="confirm" @click="confirm">确认</view>
</view>
</view>
</view>
</template>
<!-- <script src="./index.js"></script> -->
<script>
export default {
data() {
return {
}
},
onLoad() {
},
methods: {
confirm() {
//调用 uni.webView.postMessage 方法，向uniapp发送消息 postMessage ,
//uniapp会在特定时机（后退、组件销毁、分享）触发并收到消息
//先调用 uni.webView.navigateBack ，接着再调用 uni.webView.postMessage
//就会触发并接收到消息（调用顺讯不要反了，不然会触发不了发送消息）
uni.webView.navigateBack()
uni.webView.postMessage({
data: {
action: 'message' //发送的消息
}
})
},
}
}
</script>5. Finally, just receive the message in the web-view
<template>
<view>
<web-view :webview-styles="webviewStyles" :src="webViewUrl" @message="getMssage"></web-view>
</view>
</template>
<script>
export default {
data() {
return {
webviewStyles: {
progress: {
color: ' rgba(0, 126, 255, 0.99)'
}
},
webViewUrl: null
}
},
onLoad() {
//小程序仅支持加载网络网页，不支持本地html
//因为是小程序所以需要进行 decodeURIComponent
this.webViewUrl = decodeURIComponent('https://baidu.com?params=aaa')
},
methods: {
// 在uniap中以 @message 触发并收到消息
getMssage(e) {
//接收到的消息 e.detail.data 数据格式为数组
console.log('收到网页发来的消息', e.detail.data[0].action)
},
},
}
</script>