jQuery: Submit a form only if no AJAX is currently running on the page

Question

When the city input field is blurred I get somnething via an ajax request and set that as the value of a hidden field in the same form that the city field resides in.

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Answer 1

Use a lock variable like you suggested:

$('input#city').on('blur', function() {
    window.AJAX_CURRENTLY_RUNNING_ON_PAGE = true;
    $.ajax({
        url: 'get/something?param=val',
        success: function(response) {
            $('input:hidden[name="something"]').val(response);
        },
        complete: function() { window.AJAX_CURRENTLY_RUNNING_ON_PAGE = false; }
    });
});

$('form#find-users').on('submit', function() {
    if(window.AJAX_CURRENTLY_RUNNING_ON_PAGE) {
        return;
    }
    //dostuff
});