Tag Upload Controller

gistfile1.txt

public with sharing class TagDemoController {
    	Public ApexPages.StandardController sc {get; set;}
	public DocumentTag documentSelector {get; set;} 
    
	public TagDemoController(ApexPages.StandardController sc){
		this.sc = sc;
		documentSelector = new DocumentTag(); //Initialize our tag to avoid a null pointer
	}

	public PageReference save(){
		sc.getRecord().put('someIdField__c',documentSelector.itemId);
		return sc.save();
	}
     
}