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I have a situation to get userid based on email address. I have a user email address which was already stored. Now the user changed his email address. By sending the old email address how to get the userid or can i get the new email address of the user by sending old email address.

Please help to find a solution for this. Thank you.

What I have tried:

JavaScript
var customerid_d = $.Deferred();
var prefix = "i:0#.f|membership|";
var Email = prefix + Email;
var customerid_url = _spPageContextInfo.webAbsoluteUrl + "/_api/web/siteusers(@v)?@v='" + encodeURIComponent(Email) + "'";
getData(customerid_url, customerid_d, false).done(function(data) {
    var result = data.d;
    if (result != undefined && result != "" && result != null) {
        id = result.Id;
    }
});

function getData(url, d, async) {
    $.ajax({
        url: url,
        method: "GET",
        async: async,
        headers: {
            "Accept": "application/json; odata=verbose"
        },
        success: function(data) {
            d.resolve(data);
        },
        error: OnError
    });
    return d.promise();
}
Posted
Updated 21-Jan-21 4:09am
v2

1 solution

If he changed his email, it's a "new" user id. Unless you can cross-reference names and addresses, it's a "new" account (with perhaps a backward reference).

Email addresses are no longer the equivalent of a "nick name" that you change arbitrarily (unless your design accounts for it; which yours doesn't). And you should verify new email addresses with a confirmation message if you're at all serious.
   

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