Serialize input to JSON

inputToJSON

/**
 * Creates JSON for a single input field
 *
 * e.g. article[id] = 1 => { article: {id: 1}}
 *
 * @param {Node} inputElem - :input element to serialize
 * @returns {object}
 */
var serializeInputToJSON = function(inputElem) {
	var name = inputElem.name;
	var rootName = inputElem.name.split('[')[0]; // param before nesteds
	var value = inputElem.value;
	var root = {};
	var nestedParamRegex = /\[(\w*)\]/g;
	var nestedParams = name.match(nestedParamRegex);

/**
 * Recursively traverses input name to build JSON from
 * the deepest param out, excluding the root
 *
 * e.g. article[id]=1 -> {id: 1}
 *
 * @param {object} obj - object to wrap params around
 * @param {array} params - array of params matched from nestedParamRegex
 */
	function addNestedParam(obj, params) {
		if (!params.length) {
			return obj;
		}

		var copy = {};
		var param = params.pop();
		var arrayParam;

		if (Object.keys(obj).length === 0) {
			// deepest point, assign value of input
			if (param === '[]') {
				// multiple select
				arrayParam = params.pop().slice(1, -1);

				if (inputElem.multiple) {
					copy[arrayParam] = getMultipleValues(inputElem);
				}
			} else {
				copy[param.slice(1, -1)] = value;
			}
		} else {
			if (param === '[]') {
				// array belongs to parent param
				arrayParam = params.pop().slice(1, -1);
				copy[arrayParam] = [obj];
			} else {
				// wrap new param around previous data
				param = param.slice(1, -1);
				copy[param] = obj;
			}
		}

		return addNestedParam(copy, params);
	}

	function getMultipleValues(selectElem) {
		var selected = selectElem.selectedOptions;
		var i = 0, l = selected.length;
		var retArray = [];

		for (; i < l; i++) {
			if (selected[i].value) {
				retArray.push(selected[i].value);
			}
		}

		return retArray;
	}

	if (nestedParams) {
		root[rootName] = addNestedParam({}, nestedParams);
	} else {
		root[rootName] = value;
	}

	return root;
};