The content of this article is about the postmessage code in Html5 that implements value transfer between child and parent windows. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Recently, I encountered a problem when building a POS terminal. The value transfer problem between the child and parent windows. Because the POS machine has two screens, if a page is stretched and projected, it can be displayed on two screens. , but because it is a touch screen, when the first screen is operating, it will affect the second screen, and vice versa. Now that the requirements are clear and the problem is known, we need two windows to perform different operations
First the parent page:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Html5 postMessage</title>
<style>
#otherWin {
width: 600px;
height: 400px;
background-color: #cccccc;
}
#txt {
width: 500px;
height: 300px;
background-color: #cccccc;
}
</style>
</head>
<body>
<button id="btn">open</button>
<button id="send">send</button>
<input type="text" id="message" />
<br/><br/>
<p id="txt"></p>
<script>
window.onload = function() {
var btn = document.getElementById('btn');
var btn_send = document.getElementById('send');
var text = document.getElementById('txt');
var win;
btn.onclick = function() {
//通过window.open打开接收消息目标窗口
win = window.open('http://127.0.0.1:8080/mngapp/chatroom/win.html', 'popUp');
}
btn_send.onclick = function() {
// 通过 postMessage 向子窗口发送数据
win.postMessage( document.getElementById("message").value, 'http://127.0.0.1:8080/');
}
if (window.addEventListener) {
//为window注册message事件并绑定监听函数
window.addEventListener('message', receiveMsg, false);
}else {
window.attachEvent('message', receiveMsg);
}
//监听函数，接收一个参数--Event事件对象
function receiveMsg(e) {
console.log("Got a message!");
console.log("Message: " + e.data);
console.log("Origin: " + e.origin);
text.innerHTML = "Got a message!<br>" +
"Message: " + e.data +
"<br>Origin: " + e.origin;
}
};
</script>
</body>
</html>
Then the sub-page:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Html5 postMessage</title>
<style>
#txt {
width: 500px;
height: 300px;
background-color: #cccccc;
}
</style>
</head>
<body>
<h1>The New Window</h1>
<p id="txt"></p>
<input type="text" id="message" />
<button id="send">send</button>
<script>
window.onload = function() {
var text = document.getElementById('txt');
var btn_send = document.getElementById('send');
var prent = null;
btn_send.onclick = function() {
// 通过 postMessage 向父窗口发送数据
freceiveMsg(prent);
}
//监听函数，接收一个参数--Event事件对象
function receiveMsg(e) {
console.log("Got a message!");
console.log("Message: " + e.data);
console.log("Origin: " + e.origin);
text.innerHTML = "Got a message!<br>" +
"Message: " + e.data +
"<br>Origin: " + e.origin;
//获取父对象
prent = e;
}
function freceiveMsg(e) {
console.log("freceiveMsg:"+e);
e.source.postMessage(document.getElementById("message").value,
e.origin);
}
if (window.addEventListener) {
//为window注册message事件并绑定监听函数
window.addEventListener('message', receiveMsg, false);
}else {
window.attachEvent('message', receiveMsg);
}
};
</script>
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