场景描述
某些情况下,开发者可能需要实现页面间的消息传递来获取数据,例如A页面跳转至B页面后,B页面发送消息给A页面,A页面能够接收到。此时可以通过消息通道的机制来实现页面间的相互通信。
实现思路
页面messageChannel创建了消息通道,并接收消息。跳转到页面test,在页面test通过消息通道发送消息。页面messageChannel收到消息后通过toast展示出来。
解决方法
页面messageChannel.ux文件:
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<
template
>
<
div
class
=
"item-container"
>
<
input
type
=
"button"
onclick
=
"creatChannel"
value
=
"创建消息通道"
/>
<
input
type
=
"button"
onclick
=
"routeChannel"
value
=
"跳转到detail页面发送消息"
/>
<
input
type
=
"button"
onclick
=
"cancelChannel"
value
=
"关闭消息通道"
/>
</
div
>
</
template
>
<
style
>
.item-container {
margin-bottom: 50px;
flex-direction: column;
justify-content:center;
}
input{
margin-bottom: 70px;
}
</
style
>
<
script
>
import prompt from '@system.prompt'
import router from "@system.router"
var channel;
export default {
data: {
componentName: 'messageChannel'
},
onInit: function () {
this.$page.setTitleBar({text: 'messageChannel'})
},
creatChannel: function () {
channel = new BroadcastChannel('channel1');
prompt.showToast({message: '创建消息通道成功'});
channel.onmessage = function (event) {
console.log(event.data)
prompt.showToast({message: '接受消息:' + event.data});
}
},
routeChannel: function () {
router.push({
uri: '/Test'
});
},
cancelChannel: function () {
channel.close();
prompt.showToast({message: '关闭消息通道成功'});
}
}
</
script
>
|
页面test.ux文件:
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|
<
template
>
<
div
class
=
"item-container"
>
<
input
type
=
"button"
onclick
=
"postChannel"
value
=
"发送消息"
/>
</
div
>
</
template
>
<
style
>
.item-container {
margin-bottom: 50px;
flex-direction: column;
justify-content:center;
}
</
style
>
<
script
>
export default {
data: {
componentName: 'detail',
},
onInit: function () {
this.$page.setTitleBar({text: 'detail'})
},
postChannel: function () {
var channel = new BroadcastChannel('channel1');
channel.postMessage("hello world");
}
}
</
script
>
|
更多参考
快应用文档参考:
https://developer.huawei.com/consumer/cn/doc/development/quickApp-References/quickapp-script
原文链接:developer.huawei.com/consumer/cn…
原作者:Mayism