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/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
define([
'ko',
'jquery',
'underscore'
], function (ko, $, _) {
'use strict';
/**
* Checks if provided value is a dom element.
*
* @param {*} node - Value to be checked.
* @returns {Boolean}
*/
function isDomElement(node) {
return typeof node === 'object' && node.tagName && node.nodeType;
}
/**
* Removes from the provided array all non-root nodes located inside
* of the comment element as long as the closing comment tags.
*
* @param {(Array|ArrayLike)} nodes - An array of nodes to be processed.
* @returns {Array}
*/
function normalize(nodes) {
var result;
nodes = _.toArray(nodes);
result = nodes.slice();
nodes.forEach(function (node) {
if (node.nodeType === 8) {
result = !ko.virtualElements.hasBindingValue(node) ?
_.without(result, node) :
_.difference(result, ko.virtualElements.childNodes(node));
}
});
return result;
}
/**
* Extends binding context of each item in the collection.
*
* @param {...Object} extenders - Multiple extender objects to be applied to the context.
* @returns {jQueryCollection} Chainable.
*/
$.fn.extendCtx = function () {
var nodes = normalize(this),
extenders = _.toArray(arguments);
nodes.forEach(function (node) {
var ctx = ko.contextFor(node),
data = [ctx].concat(extenders);
_.extend.apply(_, data);
});
return this;
};
/**
* Evaluates bindings specified in each DOM element of collection.
*
* @param {(HTMLElement|Object)} [ctx] - Context to use for bindings evaluation.
* If not specified then current context of a collections' item will be used.
* @returns {jQueryCollection} Chainable.
*/
$.fn.applyBindings = function (ctx) {
var nodes = normalize(this),
nodeCtx;
if (isDomElement(ctx)) {
ctx = ko.contextFor(ctx);
}
nodes.forEach(function (node) {
nodeCtx = ctx || ko.contextFor(node);
ko.applyBindings(nodeCtx, node);
});
return this;
};
/**
* Adds specified bindings to each DOM element in
* collection and evaluates them with provided context.
*
* @param {(Object|Function)} data - Either bindings object or a function
* which returns bindings data for each element in collection.
* @param {(HTMLElement|Object)} [ctx] - Context to use for bindings evaluation.
* If not specified then current context of a collections' item will be used.
* @returns {jQueryCollection} Chainable.
*/
$.fn.bindings = function (data, ctx) {
var nodes = normalize(this),
bindings = data,
nodeCtx;
if (isDomElement(ctx)) {
ctx = ko.contextFor(ctx);
}
nodes.forEach(function (node) {
nodeCtx = ctx || ko.contextFor(node);
if (_.isFunction(data)) {
bindings = data(nodeCtx, node);
}
ko.applyBindingsToNode(node, bindings, nodeCtx);
});
return this;
};
});