how to get AssignedTo user's email id from the current item using SPServices

Question

I am just starting to use SPServices and have no idea how to get the current item/task assignedTo user's email id. I was searching for 2 days and didn't find a proper/easy solution. I am trying to get that in a CEWP in SharePoint 2013.

I found this script to get the ID of the current item and am struggling to use this id and get the AssignedTo user's email id

<script type="text/javascript">

    var docurl = document.URL;
    var beginindex = docurl.indexOf('?ID=') + 4;
    var endindex = docurl.indexOf('&Source=');
    var itemid = docurl.substring(beginindex, endindex);    

</script>

Please help me.

Answer 1

Based on your comments, you are open with other options other than SPServices and you just want to compare the current user with the user in the Assigned To field, I have a similar requirement before.

You should reference jQuery in order for this to work

$(document).ready(function () {
ExecuteOrDelayUntilScriptLoaded(DisableButtons, "sp.js");
});

function DisableButtons() {
var ID = getQueryStringParameter("ID");
var _itemUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/GetByTitle('List Title')/getItemById(" + ID + ")?$select=AssignedToId";
$.ajax({
    url : _itemUrl,
    method : "GET",
    headers : {
        "accept" : "application/json;odata=verbose"
    },
    success : function (data) {
        if (data.d.AssignedToId != null && data.d.AssignedToId != _spPageContextInfo.userId) {
            //disable Approve and Reject button
        }
    },
    error : function (error) {}
});

}

function getQueryStringParameter(paramToRetrieve) {
try {
    var _params = '',
    _singleParam = '';
    _params = document.URL.split("?")[1].split("&");
    for (var i = 0; i < _params.length; i = i + 1) {
        _singleParam = _params[i].split("=");
        if (_singleParam[0] === paramToRetrieve)
            return _singleParam[1];
    }
} catch (e) {}
}