GitHub上人們分享的遮罩層插件也是玲瑯滿目,不過自己動手做一個的話肯定更復(fù)合自己的需求,這里就帶大家來看使用jQuery制作Web頁面遮罩層插件的實例教程,需要的朋友可以參考下
在網(wǎng)頁上經(jīng)常遇到需要等待很久的操作,比如導(dǎo)出報表等。為了預(yù)防用戶點(diǎn)擊其他操作或者多次點(diǎn)擊同個功能,需要用遮罩層把頁面或者操作區(qū)蓋住,防止用戶進(jìn)行下一步操作,同時可以提高界面友好度,讓用戶知道操作正在執(zhí)行。
$.fn.extend({
/**
* 給元素添加遮罩層
* @param message {String} [可選]遮罩層顯示內(nèi)容
*/
mask: function (message) {
var $target = this,
fixed = false,
targetStatic = true;
if (Object.prototype.toString.call(message) !== '[object String]' || !message) {
//如果message為空或者不是字符串,則用默認(rèn)的消息提示。
message = '請稍候。。。';
}
if ($target.length === 0) {
$target = $('body');
} else {
if ($target.length > 1) {
$target = $target.first();
}
if ($target[0] === window || $target[0] === document) {
$target = $('body');
}
}
if($target[0] === document.body){
fixed = true;
}
//如果目標(biāo)元素已經(jīng)有遮罩層,獲取遮罩層
var old = $target.data('rhui.mask');
if (old) {
old.$content.html(message);
center($target, old.$content, fixed);
return;
}
//如果被遮蓋的元素是static,把元素改成relative
if ($target.css('position') === 'static') {
targetStatic = true;
$target.css('position', 'relative');
}
var $content, $overlay;
if (fixed) {
$overlay = $('<div class="rhui-mask" style="position:fixed;"></div>');
$content = $('<div class="rhui-mask-content" style="position:fixed;">' + message + '</div>');
} else {
$overlay = $('<div class="rhui-mask"></div>');
$content = $('<div class="rhui-mask-content">' + message + '</div>');
}
$overlay.appendTo($target);
$content.appendTo($target);
//顯示遮罩層
$overlay.show();
$content.show();
//讓遮罩層居中
center($target, $content, fixed);
//把遮罩層信息添加到$target
$target.data('rhui.mask', {
fixed: fixed,
$overlay: $overlay,
$content: $content,
targetStatic: targetStatic
});
/**
* 讓遮罩層內(nèi)容居中顯示
* @param $target 被遮蓋的元素
* @param $content 遮罩層內(nèi)容元素
* @param fixed 遮罩層是否固定顯示
*/
function center($target, $content, fixed) {
var $window,
height = $content.outerHeight(true),
width = $content.outerWidth(true);
if (fixed) {
//如果遮罩層固定顯示,讓遮罩層在window居中
$window = $(window);
$content.css({
left: ($window.width() - width) / 2,
top: ($window.height() - height) / 2
});
} else {
//讓遮罩層在$target中居中
$content.css({
left: ($target.width() - width) / 2,
top: ($target.height() - height) / 2
});
}
}
},
/**
* 取消遮罩層
*/
unmask: function () {
var $target;
if (this.length === 0) {
$target = $('body');
} else {
$target = this.first();
if ($target[0] === window || $target[0] === document) {
$target = $('body');
}
}
var data = $target.data('rhui.mask');
if (!data) {
return;
}
//還原目標(biāo)元素的position屬性
if (data.targetStatic) {
$target.css('position', 'static');
}
data.$overlay.remove();
data.$content.remove();
$target.removeData('rhui.mask');
}
});
插件樣式由rhui-mask和rhui-mask-content類控制,rhui-mask是遮罩層樣式,rhui-mask-content是遮罩層的提示內(nèi)容樣式。
/* 遮罩層樣式 */
.rhui-mask {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 9000;
display: block;
margin: 0;
padding: 0;
border-style: none;
background-color: #777;
opacity: 0.3;
zoom: 1;
filter: alpha(opacity=30);
}
/* 遮罩層顯示內(nèi)容樣式 */
.rhui-mask-content {
position: absolute;
z-index: 9999;
display: block;
margin: 0;
padding: 15px 20px;
border: 2px solid rgb(109, 157, 215);
background-color: #fff;
color: blue;
letter-spacing: 2px;
font-weight: bold;
font-size: 15px;
cursor: wait;
}
效果如圖所示
頁面調(diào)用完整代碼
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>網(wǎng)頁遮罩層的實現(xiàn)</title>
<style type="text/css">
/* 遮罩層樣式 */
.rhui-mask {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 9000;
display: block;
margin: 0;
padding: 0;
border-style: none;
background-color: #777;
opacity: 0.3;
zoom: 1;
filter: alpha(opacity=30);
}
/* 遮罩層顯示內(nèi)容樣式 */
.rhui-mask-content {
position: absolute;
z-index: 9999;
display: block;
margin: 0;
padding: 15px 20px;
border: 2px solid rgb(109, 157, 215);
background-color: #fff;
color: blue;
letter-spacing: 2px;
font-weight: bold;
font-size: 15px;
cursor: wait;
}
</style>
<script type="text/javascript" src="http://cdn.bootcss.com/jquery/1.11.3/jquery.js"></script>
<script type="text/javascript">
$.fn.extend({
/**
* 給元素添加遮罩層
* @param message {String} [可選]遮罩層顯示內(nèi)容
*/
mask: function (message) {
var $target = this,
fixed = false,
targetStatic = true;
if (Object.prototype.toString.call(message) !== '[object String]' || !message) {
//如果message為空或者不是字符串,則用默認(rèn)的消息提示。
message = '請稍候。。。';
}
if ($target.length === 0) {
$target = $('body');
} else {
if ($target.length > 1) {
$target = $target.first();
}
if ($target[0] === window || $target[0] === document) {
$target = $('body');
}
}
if ($target[0] === document.body) {
fixed = true;
}
//如果目標(biāo)元素已經(jīng)有遮罩層,獲取遮罩層
var old = $target.data('rhui.mask');
if (old) {
old.$content.html(message);
center($target, old.$content, fixed);
return;
}
//如果被遮蓋的元素是static,把元素改成relative
if ($target.css('position') === 'static') {
targetStatic = true;
$target.css('position', 'relative');
}
var $content, $overlay;
if (fixed) {
$overlay = $('<div class="rhui-mask" style="position:fixed;"></div>');
$content = $('<div class="rhui-mask-content" style="position:fixed;">' + message + '</div>');
} else {
$overlay = $('<div class="rhui-mask"></div>');
$content = $('<div class="rhui-mask-content">' + message + '</div>');
}
$overlay.appendTo($target);
$content.appendTo($target);
//顯示遮罩層
$overlay.show();
$content.show();
//讓遮罩層居中
center($target, $content, fixed);
//把遮罩層信息添加到$target
$target.data('rhui.mask', {
fixed: fixed,
$overlay: $overlay,
$content: $content,
targetStatic: targetStatic
});
/**
* 讓遮罩層內(nèi)容居中顯示
* @param $target 被遮蓋的元素
* @param $content 遮罩層內(nèi)容元素
* @param fixed 遮罩層是否固定顯示
*/
function center($target, $content, fixed) {
var $window,
height = $content.outerHeight(true),
width = $content.outerWidth(true);
if (fixed) {
//如果遮罩層固定顯示,讓遮罩層在window居中
$window = $(window);
$content.css({
left: ($window.width() - width) / 2,
top: ($window.height() - height) / 2
});
} else {
//讓遮罩層在$target中居中
$content.css({
left: ($target.width() - width) / 2,
top: ($target.height() - height) / 2
});
}
}
},
/**
* 取消遮罩層
*/
unmask: function () {
var $target;
if (this.length === 0) {
$target = $('body');
} else {
$target = this.first();
if ($target[0] === window || $target[0] === document) {
$target = $('body');
}
}
var data = $target.data('rhui.mask');
if (!data) {
return;
}
//還原目標(biāo)元素的position屬性
if (data.targetStatic) {
$target.css('position', 'static');
}
data.$overlay.remove();
data.$content.remove();
$target.removeData('rhui.mask');
}
});
</script>
</head>
<body>
<div id="div" style="width:600px;height:300px;margin:10px;border:1px solid red;"></div>
<script type="text/javascript">
$(function () {
//遮蓋整個頁面
//只要對window、document和body使用遮罩層,都會遮蓋整個頁面
//$(window).mask();
//$(window).unmask(); 取消遮罩
//遮蓋div
$('#div').mask('加載中,請稍候。。。');
});
</script>
</body>
</html>