ajax with csrf_token

sample_ajax_with_csft.js

// https://github.com/tokuhirom/Amon/blob/master/lib/Amon2/Plugin/Web/CSRFDefender.pm
function ajax(option) {
    this.token_name = 'csrf_token'; // 実際は別のところでsetupしておく
    if ("data" in option && "type" in option && option.type.toLowerCase() == 'post') {
        if (!this.token) {
            this.token = $('input[name=' + this.token_name + ']:first').val();
        }
        option.data[this.token_name] = this.token;
    }
    return $.ajax(option);
}