update: function()

in google-cloud-server/src/main/resources/buildServerResources/knockout.validation-2.0.3.js [1096:1140]

• 20 lines of code
• 9 McCabe index (conditional complexity)

	update: function (element, valueAccessor, allBindingsAccessor) {
		var obsv = valueAccessor(),
			config = kv.utils.getConfigOptions(element),
			val = unwrap(obsv),
			msg = null,
			isModified = false,
			isValid = false;

		if (obsv === null || typeof obsv === 'undefined') {
			throw new Error('Cannot bind validationElement to undefined value. data-bind expression: ' +
				element.getAttribute('data-bind'));
		}

		isModified = obsv.isModified && obsv.isModified();
		isValid = obsv.isValid && obsv.isValid();

		// create an evaluator function that will return something like:
		// css: { validationElement: true }
		var cssSettingsAccessor = function () {
			var css = {};

			var shouldShow = ((!config.decorateElementOnModified || isModified) ? !isValid : false);

			// css: { validationElement: false }
			css[config.errorElementClass] = shouldShow;

			return css;
		};

		//add or remove class on the element;
		ko.bindingHandlers.css.update(element, cssSettingsAccessor, allBindingsAccessor);
		if (!config.errorsAsTitle) { return; }

		ko.bindingHandlers.attr.update(element, function () {
			var
				hasModification = !config.errorsAsTitleOnModified || isModified,
				title = kv.utils.getOriginalElementTitle(element);

			if (hasModification && !isValid) {
				return { title: obsv.error, 'data-orig-title': title };
			} else if (!hasModification || isValid) {
				return { title: title, 'data-orig-title': null };
			}
		});
	}