[cas-user] cas.js javascript error in certain browser

[K S]

I am getting Object does not support property or method  trim()  javascript 
error . Is there a workaround to this error in cas.js . the code is below .

function disableEmptyInputFormSubmission() {

    $('#fm1 input[name="username"],[name="password"]').on("input", function 
(event) {
        var enableSubmission = $('#fm1 input[name="username"]').val().trim() &&
                               $('#fm1 input[name="password"]').val().trim();

        if (enableSubmission) {
            $("#fm1 input[name=submit]").removeAttr('disabled');
            event.stopPropagation();
        } else {
            $("#fm1 input[name=submit]").attr('disabled', 'true');
        }
    });

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