移动网站开发中惯用的10段JavaScript代码

1、如果网页是在iPhone或Android浏览器中查看，则在主体元素中添加“iPhone”或“Android” 类名

if (navigator.userAgent.match(/iPhone/i)) {
????$('body').addClass('iPhone');
} else if (navigator.userAgent.match(/Android/i)) {
????????$('body').addClass('Android');
}

iPhone用户浏览示例：

Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A537a Safari/419.3
Mozilla/5.0 (iPhone; U; XXXXX like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A477d Safari/419.3

Android用户浏览示例：

Mozilla/5.0 (Linux; U; Android 2.2; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 1.6; en-gb; Dell Streak Build/Donut AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/ 525.20.1
Mozilla/5.0 (Linux; U; Android 2.1-update1; de-de; HTC Desire 1.19.161.5 Build/ERE27) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17
Mozilla/5.0 (Linux; U; Android 2.2; en-us; DROID2 GLOBAL Build/S273) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 2.2; en-gb; GT-P1000 Build/FROYO) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 2.1-update1; de-de; E10i Build/2.0.2.A.0.24) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17

2、移除浏览器地址栏

window.scrollTo(0, 1);


3、防止网页触摸滚动

notouchmove = function(event) {
????event.preventDefault();
}
<div data-role="page" id="home" ontouchmove="notouchmove(event);">
...
</div>


4、当横向浏览时显示信息

var updateorientation = function (){
????var classname = '',
????top = 100;
????switch(window.orientation){
????????case 0:
????????classname += "normal";
????????break;

????????case -90:
????????classname += "landscape";
????????break;

????????case 90:
????????classname += "landscape";
????????break;

????}

????if (classname == 'landscape') {
????????if ($('#overlay').length === 0) {
????????????window.scrollTo(0, 1);
????????????$('body').append('<div id="overlay" style="width: 100%; height:' + $(document).height() + 'px"><span style="top: ' + top + 'px">Landscape view is not supported for this page.</span></div>');
????????}
????} else {
????????$('#overlay').remove();
????}
};
Usage:

var supportsOrientationChange = "onorientationchange" in window,
orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";

window.addEventListener(orientationEvent, function() {
????updateorientation();
}, false);


5、显示部分描述信息，当点击时显示完整信息

var truncatedesc = function(trunc, len) {
????if (trunc) {
???? ?var org = trunc;

???? ?if (trunc.length > len) {
????????trunc = trunc.substring(0, len);
????????trunc = trunc.replace(/w+$/, '');

????????trunc = '<span class="truncated">' + trunc;
????????trunc += '<strong class="more-description">...</strong></span>';
????????trunc += '<span class="original" style="display: none;">' + org + '</span>';
???? ?}

???? ?$('.truncated').live("touchstart touchend", function() {
????????$(this).closest('div').find('.original').show();
????????$(this).closest('div').find('.truncated').hide();
????????return false;
???? ?});

???? ?return trunc;
????}
};
Usage:

truncatedesc(item.description, 100);


6、收到成功的Ajax请求时，重定向到另一个页面(jQuery mobile)

var ajaxurl = ‘http://…’; // Your web service URL

$.ajax({
????url: ajaxurl,
????type: 'GET',
????processData: false,
????contentType: "application/json",
????dataType: "jsonp",
????success: function(data) {
????????$.mobile.changePage("results.html");
????},
????error: function() {
????????alert('Error!');
????}
});


7、从列表视图的链接中删除活动状态(jQuery mobile)

$('div').live('pageshow', function (event, ui) {
????$('[data-role=listview] li').removeClass("ui-btn-active");
});


8、从下拉选择中禁用默认的jQuery mobile样式(jQuery mobile)

$(document).bind("mobileinit", function(){
?????$.mobile.page.prototype.options.keepNative = "select";
});


9、动态更新列表视图(jQuery mobile)

var output ?= '<li><img src="' + item.image + '" alt="' + item.title + '" />';
output += '<h3><a href="' + item.url + '">' + item.title + '</a></h3>';
output += '</li>';????

$('#mylistul').append(output).listview('refresh');


10、动态添加表单输入和应用默认样式(jQuery mobile)

var html = '<input type="search" name="suburb" id="suburb" placeholder="Enter suburb" />';
$('#searchform').append(html);
$('#suburb').textinput();