Configure Document Id Settings

<script type="text/javascript" src="/_layouts/15/sp.runtime.js"></script>
<script type="text/javascript" src="/_layouts/15/sp.js"></script>
<script type="text/javascript">
//declare namespace
var ConfigureSiteSettings = ConfigureSiteSettings || {};

// use sp utility to Get field values, need to find out how it will work with Nintex forms
//var myRichTextValue = getFieldValue('SiteCollectionURL');
//alert(myRichTextValue);

ConfigureSiteSettings.UpdateDocIdSettings = (function() 
{
    var siteUrl = document.getElementById("SiteUrl").value
   var docIDPrefix = document.getElementById("docIDPrefix").value

   if(!!siteUrl && !!docIDPrefix )
   {

    var clientContext = new SP.ClientContext(siteUrl);
    oWebsite = clientContext.get_web();

    clientContext.load(oWebsite);

    clientContext.executeQueryAsync(
        Function.createDelegate(this, onQuerySucceeded), 
        Function.createDelegate(this, onQueryFailed)
    );

function onQuerySucceeded(sender, args) {
    alert('Title: ' + oWebsite.get_title() + 
        ' Description: ' + oWebsite.get_description());
    var webProperties = oWebsite.get_allProperties();
    clientContext.load(webProperties);
    var docIdValue = '<?xml version="1.0" encoding="utf-16"?><DocIdUiSettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">  <Prefix>' + docIDPrefix +  '</Prefix>  <AssignmentEnabled>true</AssignmentEnabled></DocIdUiSettings>'
  
 webProperties.set_item("docid_settings_ui", docIdValue);
    oWebsite.update();
    clientContext.executeQueryAsync(TaggedSuccess, TaggedFail);
        
}
    
function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + 
        '\n' + args.get_stackTrace());
}

function TaggedSuccess(sender, args) {
    alert("Tagged your site.");
}

function TaggedFail(sender, args) {
  alert("Tagging failed" + args.get_message());
}

}
else
{
   alert("Enter Site Url and doc prefix");
}

});
</script>

<div>
<p>
<b>Configure Document Id Settings</b>
<br />
<label>Site Collection URL<label><input type="text" value="" id="SiteUrl" />
<label>Doc ID Prefix<label><input type="text" value="" id="docIDPrefix" />

<button id="configureSiteDocIdSettings" onclick="ConfigureSiteSettings.UpdateDocIdSettings()">Configure Doc Id Settings</button>
</p>
</div>