Perfect gradient pop-up layer effect code implemented in pure JavaScript

Perfect gradient pop-up layer effect code implemented in pure JavaScript_javascript skills

WBOY

Release： 2016-05-16 18:30:22

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As the title says, this article will use pure script JavaScript to implement a gradient pop-up layer. The idea is also very simple: use IFrame to cover it, then use a DIV to display the content of the pop-up layer, and finally use its built-in functions setInterval() and clearInterval( ) to implement gradients, the principle is very simple, but you need to pay attention to the precise control of DOM objects/elements. Since the code is relatively simple, I won’t go into details here. The following code passed the test in IE6 and FF3.5.
Script Flyout.js:

Copy code The code is as follows:

// JScript File 
if (navigator.userAgent.toLowerCase().indexOf('msie') > -1) { 
window.isIE = true; 
window.isIE6 = navigator.appVersion.indexOf("MSIE 6.0;") > -1; 
window.isIE7 = navigator.appVersion.indexOf("MSIE 7.0;") > -1; 
window.isIE8 = navigator.appVersion.indexOf("MSIE 8.0;") > -1; 
} 
var $ = function(objID) { return document.getElementById(objID) }; 
var _flyout; 
var _fadeTimer; 
function showflyout(divWidth, divHeight, paddingWidth) { 
var flyout = function() { 
} 
flyout.prototype = { 
clientWidth: document.documentElement.clientWidth, 
clientHeight: document.documentElement.clientHeight, 
scrollWidth: document.documentElement.scrollWidth, 
scrollHeight: document.documentElement.scrollHeight, 
iframeID: "envelopIframe", 
divID: "popupcontent", 
iframebgColor: "#888888", 
show: function(divContent) { 
//Create envelop iframe 
cssText = "position:absolute; z-index:100; background-color:#888888; border-width:0px; filter:alpha(opacity=0); opacity:0.0;"; 
cssText  = "left:0px;"; 
cssText  = "top:0px;"; 
cssText  = "width:"   this.scrollWidth   "px;"; 
cssText  = "height:"   this.scrollHeight   "px;"; 
this.create("iframe", this.iframeID, cssText, "Cppl_IFrameSrc.htm", ""); 
_fadeTimer = setInterval(function() { fadeIframe("envelopIframe", 0.05, 0, 0.5, true) }, 5); 
//Create flyout 
var cssText = ""; 
cssText  = "display:block; _position:absolute; position:fixed; z-index:101; border:solid 1px Gray; background-color:white;"; 
cssText  = "left:"   (this.clientWidth - divWidth - paddingWidth) / 2   "px;"; 
cssText  = "top:"   (this.clientHeight - divHeight - paddingWidth) / 2   "px;"; 
cssText  = "width:"   (divWidth   paddingWidth)   "px;"; 
cssText  = "height: "   (divHeight   paddingWidth)   "px;"; 
this.create("div", this.divID, cssText, "", divContent); 
}, 
create: function(type, id, csstext, iframesrc, innerhtml) { 
var obj = document.createElement(type); 
if (iframesrc.length > 0) { 
obj.src = iframesrc; 
} 
obj.setAttribute("id", id); 
obj.style.cssText = csstext; 
if (innerhtml.length > 0) { 
obj.innerHTML = innerhtml; 
} 
document.body.appendChild(obj); 
if (iframesrc.length > 0) { 
if (window.isIE) { 
window.envelopIframe.document.bgColor = this.iframebgColor; 
} 
} 
}, 
close: function() { 
var objIframe = document.getElementById(this.iframeID); 
var objDiv = document.getElementById(this.divID); 
if (objIframe && objDiv) { 
document.body.removeChild(objIframe); 
document.body.removeChild(objDiv); 
} 
}, 
onresize: function() { 
var objIframe = document.getElementById(this.iframeID); 
var objDiv = document.getElementById(this.divID); 
if (objIframe && objDiv) { 
objIframe.style.width = document.documentElement.scrollWidth   "px"; 
objIframe.style.height = document.documentElement.scrollHeight   "px"; 
objDiv.style.left = (document.documentElement.clientWidth - divWidth) / 2   "px"; 
objDiv.style.top = (document.documentElement.clientHeight - divHeight) / 2   "px"; 
} 
}, 
onscroll: function() { 
var objDiv = document.getElementById(this.divID); 
if (objDiv) { 
objDiv.style.left = (document.documentElement.clientWidth - divWidth) / 2   document.documentElement.scrollLeft   "px"; 
objDiv.style.top = (document.documentElement.clientHeight - divHeight) / 2   document.documentElement.scrollTop   "px"; 
} 
} 
}; 
_flyout = new flyout(); 
_flyout.show("This is a flyout.Close Flyout
"); 
} 
function closeflyout() { 
clearInterval(_fadeTimer); 
_fadeTimer = setInterval(function() { fadeIframe("envelopIframe", 0.05, 0, 0.5, false) }, 5); 
} 
window.onresize = function() { 
if (_flyout) { 
_flyout.onresize(); 
} 
}; 
window.onscroll = function() { 
if (_flyout && isIE6) { 
_flyout.onscroll(); 
} 
}; 
function fadeIframe(objId, speed, minOpacity, maxOpacity, flag) { 
var dialog = $(objId); 
if (dialog) { 
var value; 
if (flag) { 
if (parseFloat(dialog.style.opacity) <= maxOpacity) { 
value = parseFloat(dialog.style.opacity)   speed; 
dialog.style.filter = 'alpha(opacity='   value * 100   ')'; 
dialog.style.opacity = ''   value   ''; 
} 
else { 
clearInterval(_fadeTimer); 
} 
} 
else { 
if (parseFloat(dialog.style.opacity) >= minOpacity) { 
value = parseFloat(dialog.style.opacity) - speed; 
dialog.style.filter = 'alpha(opacity='   value * 100   ')'; 
dialog.style.opacity = ''   value   ''; 
} 
else { 
clearInterval(_fadeTimer); 
if (_flyout) { 
_flyout.close(); 
} 
} 
} 
} 
} 

调用ASPX代码:

复制代码代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

Flyout Sample

最终效果图：