


Code for postmessage in Html5 to implement value transfer between child and parent windows
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> </body>
Recommended related articles:
html5 video how to achieve real-time monitoring of the current situation Play time (code)
html Combined with the industrial Internet to realize intelligent aircraft control (with code)
The above is the detailed content of Code for postmessage in Html5 to implement value transfer between child and parent windows. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



Running the H5 project requires the following steps: installing necessary tools such as web server, Node.js, development tools, etc. Build a development environment, create project folders, initialize projects, and write code. Start the development server and run the command using the command line. Preview the project in your browser and enter the development server URL. Publish projects, optimize code, deploy projects, and set up web server configuration.

H5 page production refers to the creation of cross-platform compatible web pages using technologies such as HTML5, CSS3 and JavaScript. Its core lies in the browser's parsing code, rendering structure, style and interactive functions. Common technologies include animation effects, responsive design, and data interaction. To avoid errors, developers should be debugged; performance optimization and best practices include image format optimization, request reduction and code specifications, etc. to improve loading speed and code quality.

The steps to create an H5 click icon include: preparing a square source image in the image editing software. Add interactivity in the H5 editor and set the click event. Create a hotspot that covers the entire icon. Set the action of click events, such as jumping to the page or triggering animation. Export H5 documents as HTML, CSS, and JavaScript files. Deploy the exported files to a website or other platform.

H5. The main difference between mini programs and APP is: technical architecture: H5 is based on web technology, and mini programs and APP are independent applications. Experience and functions: H5 is light and easy to use, with limited functions; mini programs are lightweight and have good interactiveness; APPs are powerful and have smooth experience. Compatibility: H5 is cross-platform compatible, applets and APPs are restricted by the platform. Development cost: H5 has low development cost, medium mini programs, and highest APP. Applicable scenarios: H5 is suitable for information display, applets are suitable for lightweight applications, and APPs are suitable for complex functions.

H5 is not a standalone programming language, but a collection of HTML5, CSS3 and JavaScript for building modern web applications. 1. HTML5 defines the web page structure and content, and provides new tags and APIs. 2. CSS3 controls style and layout, and introduces new features such as animation. 3. JavaScript implements dynamic interaction and enhances functions through DOM operations and asynchronous requests.

The article discusses managing user location privacy and permissions using the Geolocation API, emphasizing best practices for requesting permissions, ensuring data security, and complying with privacy laws.

H5 (HTML5) is suitable for lightweight applications, such as marketing campaign pages, product display pages and corporate promotion micro-websites. Its advantages lie in cross-platformity and rich interactivity, but its limitations lie in complex interactions and animations, local resource access and offline capabilities.

<p>The next page function can be created through HTML. The steps include: creating container elements, splitting content, adding navigation links, hiding other pages, and adding scripts. This feature allows users to browse segmented content, displaying only one page at a time, and is suitable for displaying large amounts of data or content. </p>
