Limit Category to 1 Category in Edit Screen.

 

/*
* Limit Category to 1 Category in Edit Screen.
*/

function limit_cat_to_one() {
    if ( is_admin() ) {
    ?>
<script>jQuery(document).ready(function ($) {
$("#category-all input:checkbox").change(function () {
var max = 1;
var count = $("#category-all input:checked").length;
if (count > max) {
$(this).prop("checked", "");
alert("You can choose " + max + " Categor" + (max == 1 ? "y" : "ies"));
}
});
});</script>
    <?php

    }
}

add_action( 'admin_head', 'limit_cat_to_one' );

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