SharePoint REST service to add an exsiting site content type to a list/library

Question

Trying to use SharePoint 2013 REST Service to add existing site content types to a list/library. Below MSDN article suggests that the POST method is available but does not say how to use it.
http://msdn.microsoft.com/en-us/library/office/jj246793%28v=office.15%29.aspx#postsyntax_htm
POST http://<sitecollection>/<site>/_api/web/lists(listid)/contenttypes/add(parameters)
How do we create the body for this rest call?

Answer 1

Hi You need to use the addAvailableContentType method to attach a Existing Content Type to a list/Library.
Consider the below Sample. Take the Id of the Content Type and pass it.
the REST API URL is 
 http://<sitecollection>/<site>/_api/web/lists(listid)/contenttypes/addAvailableContentType(contentTypeId)
var siteUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbytitle('Employees')/ContentTypes/AddAvailableContentType";
    var call = jQuery.ajax({
        url: siteUrl,
        type: "POST",
        data: JSON.stringify({            
            "contentTypeId": "0x0100E5EC1FE6D284A74A972A1776FFFE2DA0"            
        headers:
               'accept': 'application/json;odata=verbose',
                "content-type": "application/json;odata=verbose",
                "X-RequestDigest": jQuery("#__REQUESTDIGEST").val()
    call.done(function (data, textStatus, jqXHR) {
        var message = jQuery("#message");
        message.text("Added Content Type Successfully");
    call.fail(function (data, errorcode, errormessage) {
        alert("Could not enable content types: " + errormessage);
Here 0x0100E5EC1FE6D284A74A972A1776FFFE2DA0 is the Content Type Id of my existing Content type "Employees"
Ensure the AllowContentTypes is set to True for that List/Library
R.Mani | http://rmanimaran.wordpress.com