Function getRespCodeTarget

static/script/response-targets.js:17–62

* @param {HTMLElement} elt * @param {number} respCode * @returns {HTMLElement | null}

(elt, respCodeNumber)

     * @returns {HTMLElement | null}
     */
    function getRespCodeTarget(elt, respCodeNumber) {
        if (!elt || !respCodeNumber) return null;

        var respCode = respCodeNumber.toString();

        // '*' is the original syntax, as the obvious character for a wildcard.
        // The 'x' alternative was added for maximum compatibility with HTML
        // templating engines, due to ambiguity around which characters are
        // supported in HTML attributes.
        //
        // Start with the most specific possible attribute and generalize from
        // there.
        var attrPossibilities = [
            respCode,

            respCode.substr(0, 2) + '*',
            respCode.substr(0, 2) + 'x',

            respCode.substr(0, 1) + '*',
            respCode.substr(0, 1) + 'x',
            respCode.substr(0, 1) + '**',
            respCode.substr(0, 1) + 'xx',

            '*',
            'x',
            '***',
            'xxx',
        ];
        if (startsWith(respCode, '4') || startsWith(respCode, '5')) {
            attrPossibilities.push('error');
        }

        for (var i = 0; i < attrPossibilities.length; i++) {
            var attr = attrPrefix + attrPossibilities[i];
            var attrValue = api.getClosestAttributeValue(elt, attr);
            if (attrValue) {
                if (attrValue === "this") {
                    return api.findThisElement(elt, attr);
                } else {
                    return api.querySelectorExt(elt, attrValue);
                }
            }
        }
        
        return null;
    }

    /** @param {Event} evt */
    function handleErrorFlag(evt) {