/* 
	Script by: Tim Wheeler http://tjwheeler.blogspot.com/
	This script retrieves the classification properties from the Root Web of the current site collection's property bag.
	It then injects html positioned at the top center of the page identifying the content classification.
	If the properties are not present or invalid it will show an Unclassified name.
	This script should be referenced in the master page: Eg;
	<SharePoint:ScriptLink language="javascript" name="~SiteCollection/style library/classify/classify.js" OnDemand="false" runat="server" Localizable="false" /> 
	Thanks to Jeremy Thake for his post on retrieving the property bag values: http://www.jeremythake.com/2013/10/using-the-sharepoint-csom-api-to-get-a-property-bag-value/
*/
var spClassify= {};
//Function that makes the client side call to the server
spClassify.getClassification = function(onSuccess, onFailure) {
    spClassify.clientContext = SP.ClientContext.get_current();
    spClassify.site = spClassify.clientContext.get_site();
    spClassify.web = spClassify.site.get_rootWeb();
    spClassify.clientContext.load(spClassify.web);
    spClassify.properties = spClassify.web.get_allProperties();
	spClassify.clientContext.load(spClassify.properties);
    spClassify.clientContext.executeQueryAsync(Function.createDelegate(this, onSuccess), Function.createDelegate(this, onFailure));
};
spClassify.renderLink = function(color, backColor, name, url){
	$('body').append('<div id="classificationWrapper" style="background:' + backColor + ';border-left:1px solid black;border-bottom:1px solid black;border-right:1px solid black; position:absolute; left:50%;border-bottom-left-radius: 4px;border-bottom-right-radius: 4px; padding-top:1px;padding-left: 5px; padding-right:5px;  padding-bottom: 2px; top:0;"></div>');
	var link = '<a id="classificationLink" target=_blank; href="' + url  + '" style="color:' + color + ';">' + name + '</a>';
	$("#classificationWrapper").append(link);
	$("#classificationWrapper").append('<label style="color:' + color + '" onclick="$(\'#classificationWrapper\').hide()"> &nbsp;&#94;</label>'); 
};
//If successful, this method is called
spClassify.onSuccess = function(sender, args) {
	try
	{
	    var color = spClassify.properties.get_item('ClassificationColor'); // '#32B332'
  	    var backColor = spClassify.properties.get_item('ClassificationBackColor'); // '#32B332'
	    var name =  spClassify.properties.get_item('ClassificationName');
	    var url = spClassify.properties.get_item('ClassificationUrl');
	    spClassify.renderLink(color, backColor, name, url);
	}
	catch(e)
	{
	 	var color = 'black';
  	    var backColor = 'white';
	    var name =  'Unclassified';
	    var url = '';
   	    spClassify.renderLink(color, backColor, name, url);
	}
};
//If an error occurs this method is called
spClassify.onFailure = function(sender, args) {
    if (args instanceof SP.ClientRequestFailedEventArgs) {
        var message = args.get_message();
        var code = args.get_errorCode();
        var details = args.get_errorDetails();
        var value = args.get_errorValue();
        var typeName = args.get_errorTypeName();
        var stack = args.get_stackTrace();
        var correlationId = args.get_errorTraceCorrelationId();
        alert('Error: ' + message + ".");
    } else {
        alert('Unexpected Error accessing classification: ' + args);
    }
};
//This method initates the process
function ClassifyThis() {
	spClassify.getClassification(spClassify.onSuccess, spClassify.onFailure);
} 
$(document).ready(function () {
    ExecuteOrDelayUntilScriptLoaded(ClassifyThis, "SP.js");
});

 <SharePoint:ScriptLink language="javascript" name="~SiteCollection/style library/classify/classify.js" OnDemand="false" runat="server" Localizable="false" /> 

#Name: Set-SiteClassification
#Description: Applies details of the site classification to the property bag on the root web.  
#           : Cominded with the classify.js script, the classification will display at the top center of the web page. 
#Note:This is informational only and requires a reference to the classify.js script.
#Usage: 
#    $green = "#18A329"
#    $white = "#ffffff"
#    .\ClassifySiteCollection "http://mysharepoint" "Low" $green $white "http://mysharepoint/pages/classificatons.aspx"
param
(
    $siteCollectionUrl = (Read-Host "Please enter a site collection URL"),
    $name = (Read-Host "Please enter a classificaton name"),
    $backColor = (Read-Host "Please enter the background color value"),
    $color = (Read-Host "Please enter the foreground color"),
    $url = (Read-Host "Please enter the url of the classificaton definition")
)
$site = get-spsite $siteCollectionUrl
$web = $site.RootWeb;
$web.AllProperties['ClassificationColor'] = $color
$web.AllProperties['ClassificationBackColor'] = $backColor
$web.AllProperties['ClassificationName'] = $name
$web.AllProperties["ClassificationUrl"] = $url
$web.Update()
"A classification of '$name' has been applied to site collection " + $site.Url 

 #Name: Get-SiteCollection
#Description: Retrieves the properties for the classification if it has been applied to the site collection
#Usage: 
#    .\Get-SiteClassification "http://mysharepoint"
param
(
    $siteCollectionUrl = (Read-Host "Please enter a site collection URL")
)
$site = get-spsite $siteCollectionUrl
$web = $site.RootWeb
"ClassificationName:" + $web.AllProperties['ClassificationName']
"ClassificationColor:" + $web.AllProperties['ClassificationColor']
"ClassificationBackColor:" + $web.AllProperties['ClassificationBackColor']
"ClassificationUrl:" + $web.AllProperties["ClassificationUrl"]