Implementation of screen orientation change and scrolling in JQuery mobile page development

Home

Web Front-end

JS Tutorial

Implementation of screen orientation change and scrolling in JQuery mobile page development_jquery

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 16, 2016 pm 03:27 PM

jquerymove

Orientation change event (orientationchange)
This event is triggered when the orientation of the device changes (the device is held horizontally or vertically). When binding this event, your callback function can add a second parameter, which is used to describe the horizontal or vertical attributes of the device, "portrait" or; landscape. These values will also be added to html elements as class values, so that You can change their styles through selectors in css. Note that we now bind the resize event when the browser does not support the orientationChange event.

Executed when the orientation of the handheld device changes

 $(window).bind( 'orientationchange', function(e){
 var height=document.body.clientHeight - 195;
 $("#content").css("min-height",height);
 $("#thumb").css("margin",height/4.2 + "px auto");
 });

The above example is used by me to fill the entire page when the handheld device changes orientation to avoid blank spaces, and can be expanded according to your own needs.

$(function(){
 $('a').click(function(){
 $(window).trigger('orientationchange' );
 });
});

On smartphones and tablet devices, there is only one orientation event named orientationchange. This event is triggered when the device is rotated vertically or horizontally. To determine in which direction the device is rotated, you can access the orientation property, which provides a read-only value portrait or landscape.

Binding to the orientationchange event requires you to position the body element and then use the bind method to bind the event. It's also important to bind the orientationchange event to the body, but wait until the element is ready in the document before binding the event. Otherwise, you will get inconsistent results because the body element may not be available at binding time. You can also enhance this code further to fire the orientationchange event when the document is ready.

The orientationchange event is triggered when the document is ready

<!DOCTYPE HTML>
<html>
<head>
<title>Understanding the jQuery Mobile API</title>
<link rel="stylesheet" href="jquery.mobile.css" />
<script src="jquery.js"></script>
<script type="text/java script">
$(document).ready(function(){
 $(".tap-hold-test").bind("taphold", function(event) {
 $(this).html("Tapped and held");
 });
});
</script>
<script src="jquery.mobile.js"></script>
</head>
<body>
<div data-role="page" id="my-page">
<div data-role="header">
<h1 id="Header">Header</h1>
</div>
<div data-role="content">
<ul data-role="listview" id="my-list">
<li class="tap-hold-test">Tap and hold test</li>
</ul>
</div>
</div>
</body>
</html>

$(document).ready(function(){
 $('body').bind('orientationchange', function(event) {
 alert('orientationchange: '+ event.orientation);
 });
});

Fires the event when the document is ready, this allows you to determine the orientation of the web page when it initially loads. This is particularly useful when you need to display content using the device's current orientation. You can also access orientation values through CSS as they are added to HTML elements in the web page. These powerful features allow you to modify the layout of your content in the device's orientation.

Scroll events (scrollstart, scrollstop)
scrollstart: Triggered when screen scrolling starts. Apple's devices will freeze DOM operations during scrolling, and execute these DOM operations in a queue when the scrolling ends. We are currently studying methods to allow Apple's devices to perform DOM operations before scrolling begins.

$(document).ready(function(){

 $('body').bind('scrollstart', function(event) {
 // Add scroll start code here
 });

});

scrollstop: triggered when scrolling ends.

$(document).ready(function(){

 $('body').bind('scrollstop', function(event) {
 // Add scroll stop code here
 });

});

<!DOCTYPE html>
<html>
 <head>
  <title>Ajax测试</title>
  <meta charset="gbk">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="jquery-mobile/jquery.mobile-1.2.0.min.css"/>
  <link rel="stylesheet" href="jquery-mobile/jquery.mobile.structure-1.2.0.min.css"/>
  <script src="jquery-mobile/jquery-1.8.2.min.js"></script>
  <script src="jquery-mobile/jquery.mobile-1.2.0.min.js"></script>
 </head>
 <body>
  <div data-role="page" data-theme="b">
  <div data-role="header"></div>
  <div data-role="content">
   <script>
 //scrollstart事件
 function scrollstartFunc(evt) {
  try
  {
  var target = $(evt.target);
  while (target.attr("id") == undefined) {
  target = target.parent();
  }
  //获取触点目标id属性值
  var targetId = target.attr("id");
  alert("targetId: " + targetId);
  }
  catch (e) {
  alert('myscrollfunc：' + e.message);
  }
 }
 function myinit() {
  //绑定上下滑动事件
  $("#myul").bind('scrollstart', function () { scrollstartFunc(event); });
 }
 window.onload = myinit;
 </script>
 <!-- listview测试 -->
 <ul id="myul" data-role="listview" data-inset="true">
 <li data-role="list-divider">信息列表</li>
 <li id="li1" data-role="fieldcontain">信息1</li>
 <li id="li2" data-role="fieldcontain">信息2</li>
 <li id="li3" data-role="fieldcontain">信息3</li>
 <li id="li4" data-role="fieldcontain">信息4</li>
 <li id="li5" data-role="fieldcontain">信息5</li>
 <li id="li6" data-role="fieldcontain">信息6</li>
 <li id="li7" data-role="fieldcontain">信息7</li>
 <li id="li8" data-role="fieldcontain">信息8</li>
 <li id="li9" data-role="fieldcontain">信息9</li>
 <li id="li10" data-role="fieldcontain">信息10</li>
 </ul>
  </div>
 </body>
</html>

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

JavaScript in Action: Real-World Examples and ProjectsApr 19, 2025 am 12:13 AM

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AM

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AM

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AM

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

See all articles