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Javascript: Overlay
Posted by JDBurnZ on Apr 30 2008 @ 07:12 :: 1382 unique visits
Initially, I had been using a modified version of lightbox (left over from when I was a javascript n00b,) to create an overlay which forced the user to perform some action in that area before being able to return to the original page.That being said, the script was a cumbersome 55KB in size and wasn't even functionized how I would have liked it to be.
After finally getting up the ambition to create my own version which is from my testing, 100% compatible with both Firefox and Internet Explorer, I figured I would share my code. This code is FREE to use and distribute for any reason you wish as so long as you credit the developer (me).
CODE: JAVASCRIPT
function overlayBox(url, overlayBgOpacity, overlayBoxHeight, overlayBoxWidth, overlayBgColor, overlayBoxColor) {
if(!overlayBoxColor) {
overlayBoxColor = "#ffffff";
if(!overlayBgColor) {
overlayBgColor = "#666666";
if(!overlayBoxWidth) {
overlayBoxWidth = "500px";
if(!overlayBoxHeight) {
overlayBoxHeight = "350px";
if(!overlayBgOpacity) {
overlayBgOpacity = 7;
}
}
}
}
}
// Containing box
var overlayBox = document.createElement("div");
overlayBox.setAttribute("id" ,"overlayBox");
overlayBox.style.height = overlayBoxHeight;
overlayBox.style.width = overlayBoxWidth;
overlayBox.style.position = "absolute";
overlayBox.style.top = "0px";
overlayBox.style.left = "0px";
overlayBox.style.height = "100%";
overlayBox.style.width = "100%";
overlayBox.style.zIndex = "9999";
overlayBox.innerHTML = "<table cellspacing=\"0\" cellpadding=\"0\" width=\"100%\" height=\"100%\" border=\"1\"><tr><td valign=\"middle\" align=\"center\"><div id=\"overlayContent\" style=\"height: " + overlayBoxHeight + "; width: " + overlayBoxWidth + "; background-color: " + overlayBoxColor + ";\"></div></td></tr></table>";
// Partially transparent background
var overlayBg = document.createElement("div");
overlayBg.setAttribute("id", "overlayBg");
overlayBg.setAttribute("height", "100%");
overlayBg.setAttribute("width", "100%");
overlayBg.style.position = "absolute";
overlayBg.style.top = "0px";
overlayBg.style.left = "0px";
overlayBg.style.height = "100%";
overlayBg.style.width = "100%";
overlayBg.style.backgroundColor = overlayBgColor;
if(overlayBgOpacity == "10") {
overlayBg.style.opacity = "1.0";
} else {
overlayBg.style.opacity = "." + overlayBgOpacity;
}
overlayBg.style.filter = "alpha(opacity=" + overlayBgOpacity + "0)";
overlayBox.style.zIndex = "9998";
overlayBg.innerHTML = "<table width=\"100%\" height=\"100%\"><tr><td> </td></tr></table>";
// Apply the DIVs as a child to BODY
document.getElementsByTagName("body")[0].appendChild(overlayBg);
document.getElementsByTagName("body")[0].appendChild(overlayBox);
ajaxGet("overlayContent", url);
}
function overlayBoxClose() {
document.getElementsByTagName("body")[0].removeChild(document.getElementById("overlayBox"));
document.getElementsByTagName("body")[0].removeChild(document.getElementById("overlayBg"));
}
if(!overlayBoxColor) {
overlayBoxColor = "#ffffff";
if(!overlayBgColor) {
overlayBgColor = "#666666";
if(!overlayBoxWidth) {
overlayBoxWidth = "500px";
if(!overlayBoxHeight) {
overlayBoxHeight = "350px";
if(!overlayBgOpacity) {
overlayBgOpacity = 7;
}
}
}
}
}
// Containing box
var overlayBox = document.createElement("div");
overlayBox.setAttribute("id" ,"overlayBox");
overlayBox.style.height = overlayBoxHeight;
overlayBox.style.width = overlayBoxWidth;
overlayBox.style.position = "absolute";
overlayBox.style.top = "0px";
overlayBox.style.left = "0px";
overlayBox.style.height = "100%";
overlayBox.style.width = "100%";
overlayBox.style.zIndex = "9999";
overlayBox.innerHTML = "<table cellspacing=\"0\" cellpadding=\"0\" width=\"100%\" height=\"100%\" border=\"1\"><tr><td valign=\"middle\" align=\"center\"><div id=\"overlayContent\" style=\"height: " + overlayBoxHeight + "; width: " + overlayBoxWidth + "; background-color: " + overlayBoxColor + ";\"></div></td></tr></table>";
// Partially transparent background
var overlayBg = document.createElement("div");
overlayBg.setAttribute("id", "overlayBg");
overlayBg.setAttribute("height", "100%");
overlayBg.setAttribute("width", "100%");
overlayBg.style.position = "absolute";
overlayBg.style.top = "0px";
overlayBg.style.left = "0px";
overlayBg.style.height = "100%";
overlayBg.style.width = "100%";
overlayBg.style.backgroundColor = overlayBgColor;
if(overlayBgOpacity == "10") {
overlayBg.style.opacity = "1.0";
} else {
overlayBg.style.opacity = "." + overlayBgOpacity;
}
overlayBg.style.filter = "alpha(opacity=" + overlayBgOpacity + "0)";
overlayBox.style.zIndex = "9998";
overlayBg.innerHTML = "<table width=\"100%\" height=\"100%\"><tr><td> </td></tr></table>";
// Apply the DIVs as a child to BODY
document.getElementsByTagName("body")[0].appendChild(overlayBg);
document.getElementsByTagName("body")[0].appendChild(overlayBox);
ajaxGet("overlayContent", url);
}
function overlayBoxClose() {
document.getElementsByTagName("body")[0].removeChild(document.getElementById("overlayBox"));
document.getElementsByTagName("body")[0].removeChild(document.getElementById("overlayBg"));
}
Note: For this to display correctly in Internet Explorer (of course,) there is always a catch... You have to specify the height of the BODY tag to 100%. If you don't, the result is rather.. Unexpected! :)
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1. On Apr 30 2008 @ 07:15 JDBurnZ wrote:
A working example:To close the overlay, in somepage.php use the overlayBoxClose() function:
Also note: In this example I call ajaxGet to do all the dirty work, and populate the contents of the DIV, overlayContent. You could instead, use overlayBox.innerHTML = "something"; instead.
Alternately, you may search for my customized AJAX code, which supports both POST and GET methods.