Ribbon Button activating when a field in the Document / List item metadata = 'Yes'

Question

Im hoping this is an easy answer as Im sure it must be, but my mind has gone blank!
Basically I have created a button to run some javascript code to fire a custom (manual) workflow on an item that is selected in a Document Library (or List)
I have set the ribbon button to only be active IF one item is selected in the Library but what I want now is to only activate the ribbon button if one item is selected AND IF a specific field in the item = 'Yes' (The field in this case being called 'DraftDoc'
[Choice field]).
Ive tried a few methods but none seem to work and VS2012 errors on debugging.
My code to enable the button so far is:
// Method to enable/disable the button on the ribbon.
function EnableSubmitDraftDocument() {
// request number of selected items.
var items = SP.ListOperation.Selection.getSelectedItems();
var count = CountDictionary(items);
// only return true is a single item is selected.
return (count == 1);
Can anyone help me with the extra code I need?
Cheers

Answer 1

Hi,     
According to your description, you have been able to set the ribbon button to be actived if one item is selected. Now, you want to activate the ribbon button if there is one
item selected and the value of "DraftDoc" column is "Yes".
We can achieve it by getting the value of this "DraftDoc" column of the selected item to check whether it is "Yes".
Here is a code demo about checking whether the value of "DraftDoc" column of the selected item for your reference:
function retrieveSelectedFiles()
this.clientContext = SP.ClientContext.get_current();
var web = this.clientContext.get_web();
this.selectedItem = SP.ListOperation.Selection.getSelectedItems();
this.selectedList = SP.ListOperation.Selection.getSelectedList();
if (CountDictionary(selectedItem) == 1)
this.listItem = web.get_lists().getById(this.selectedList).getItemById(this.selectedItem[0].id);
this.clientContext.load(this.listItem);
this.clientContext.executeQueryAsync(Function.createDelegate(this, onRequestSucceeded), Function.createDelegate(this, onRequestFailed));
function onRequestSucceeded() {
str = listItem.get_item('DraftDoc');
if(str == 'Yes')
str+="Yes";
alert(str);
function onRequestFailed(sender, args) {
alert('Error: ' + args.get_message());
Best regards
Patrick Liang
TechNet Community Support