This javascript allows you to show a message when the visitor is not using at least a minimum version of a web browser that your web page requires. For example, if you load this page in lesser versions of Internet Explorer 8, Firefox 3, Google Chrome 3, or Safari 528 you will get a message.
Source Code:
<script type="text/javascript" language="javascript">
window.onload = function() { checkBrowserCurrentVersion(); }
function checkBrowserCurrentVersion() {
/* This function checks for minimum browser versions and alerts visitor if browser version not met. Author Joe McCormack. www.virtualsecrets.com */
/* Minimum Browser Versions Required */
var minVersion_IE = 8;
var minVersion_FF = 3.5;
var minVersion_Chrome = 3;
var minVersion_Safari = 528;
/* Message To Show If Browser Version Is Less Than Version Required */
var browserMinVersionMsg = "This page may not work properly given the current version of the web browser you are using.";
/* Do not modify */
var current_browserDetect = navigator.userAgent.toLowerCase();
var current_browserName = "";
var current_browserVersion = 0;
var minBrowserVersionMet = 0;
broBlock = new Array();
if (current_browserDetect.indexOf("msie") > 0) {
broBlock = current_browserDetect.split("(")[1].split(")")[0].split(/\;/g);
for (x = 0; x < broBlock.length; x++) {
if (broBlock[x].indexOf("msie") > 0) {
broBlock[x] = broBlock[x].replace(/^\s+/, "");
broBlock[x] = broBlock[x].replace(/\s+$/, "");
current_browserName = broBlock[x].split(" ")[0];
current_browserVersion = broBlock[x].split(" ")[1];
}
}
if (current_browserVersion >= minVersion_IE) { minBrowserVersionMet = 1; }
}
else if (current_browserDetect.indexOf("firefox") > 0) {
broBlock[0] = current_browserDetect.split("firefox")[1].split(" ")[0];
broBlock[0] = broBlock[0].replace(/^\//, "");
current_browserName = "firefox";
current_browserVersion = broBlock[0];
if (parseFloat(current_browserVersion) >= parseFloat(minVersion_FF)) { minBrowserVersionMet = 1; }
}
else if (current_browserDetect.indexOf("chrome") > 0) {
broBlock[0] = current_browserDetect.split("chrome")[1].split(" ")[0];
broBlock[0] = broBlock[0].replace(/^\//, "");
current_browserName = "chrome";
current_browserVersion = broBlock[0];
if (parseFloat(current_browserVersion) >= parseFloat(minVersion_Chrome)) { minBrowserVersionMet = 1; }
}
else if (current_browserDetect.indexOf("safari") > 0) {
broBlock[0] = current_browserDetect.split("safari")[1].split(" ")[0];
broBlock[0] = broBlock[0].replace(/^\//, "");
current_browserName = "safari";
current_browserVersion = broBlock[0];
if (current_browserVersion >= minVersion_Safari) { minBrowserVersionMet = 1; }
}
else {
current_browserName = "Unknown";
current_browserVersion = 0;
minBrowserVersionMet = 1;
}
if (minBrowserVersionMet == 0) {
var compiled = "";
compiled = "Minimum Browser Version Not Met:\n\nBrowser: " + current_browserName.toUpperCase() + "\nVersion: " + current_browserVersion + "\n\n";
compiled = compiled + browserMinVersionMsg;
alert(compiled);
}
}
</script>
