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// Copyright 2009 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Utilities for adding, removing and setting values in
* an Element's dataset.
* See {@link http://www.w3.org/TR/html5/Overview.html#dom-dataset}.
*
*/
goog.provide('goog.dom.dataset');
goog.require('goog.string');
/**
* The DOM attribute name prefix that must be present for it to be considered
* for a dataset.
* @type {string}
* @const
* @private
*/
goog.dom.dataset.PREFIX_ = 'data-';
/**
* Sets a custom data attribute on an element. The key should be
* in camelCase format (e.g "keyName" for the "data-key-name" attribute).
* @param {Element} element DOM node to set the custom data attribute on.
* @param {string} key Key for the custom data attribute.
* @param {string} value Value for the custom data attribute.
*/
goog.dom.dataset.set = function(element, key, value) {
if (element.dataset) {
element.dataset[key] = value;
} else {
element.setAttribute(
goog.dom.dataset.PREFIX_ + goog.string.toSelectorCase(key),
value);
}
};
/**
* Gets a custom data attribute from an element. The key should be
* in camelCase format (e.g "keyName" for the "data-key-name" attribute).
* @param {Element} element DOM node to get the custom data attribute from.
* @param {string} key Key for the custom data attribute.
* @return {?string} The attribute value, if it exists.
*/
goog.dom.dataset.get = function(element, key) {
if (element.dataset) {
return element.dataset[key];
} else {
return element.getAttribute(goog.dom.dataset.PREFIX_ +
goog.string.toSelectorCase(key));
}
};
/**
* Removes a custom data attribute from an element. The key should be
* in camelCase format (e.g "keyName" for the "data-key-name" attribute).
* @param {Element} element DOM node to get the custom data attribute from.
* @param {string} key Key for the custom data attribute.
*/
goog.dom.dataset.remove = function(element, key) {
if (element.dataset) {
delete element.dataset[key];
} else {
element.removeAttribute(goog.dom.dataset.PREFIX_ +
goog.string.toSelectorCase(key));
}
};
/**
* Checks whether custom data attribute exists on an element. The key should be
* in camelCase format (e.g "keyName" for the "data-key-name" attribute).
*
* @param {Element} element DOM node to get the custom data attribute from.
* @param {string} key Key for the custom data attribute.
* @return {boolean} Whether the attibute exists.
*/
goog.dom.dataset.has = function(element, key) {
if (element.dataset) {
return key in element.dataset;
} else if (element.hasAttribute) {
return element.hasAttribute(goog.dom.dataset.PREFIX_ +
goog.string.toSelectorCase(key));
} else {
return !!(element.getAttribute(goog.dom.dataset.PREFIX_ +
goog.string.toSelectorCase(key)));
}
};
/**
* Gets all custom data attributes as a string map. The attribute names will be
* camel cased (e.g., data-foo-bar -> dataset['foobar']). This operation is not
* safe for attributes having camel-cased names clashing with already existing
* properties (e.g., data-to-string -> dataset['toString']).
* @param {!Element} element DOM node to get the data attributes from.
* @return {!Object} The string map containing data attributes and their
* respective values.
*/
goog.dom.dataset.getAll = function(element) {
if (element.dataset) {
return element.dataset;
} else {
var dataset = {};
var attributes = element.attributes;
for (var i = 0; i < attributes.length; ++i) {
var attribute = attributes[i];
if (goog.string.startsWith(attribute.name,
goog.dom.dataset.PREFIX_)) {
// We use substr(5), since it's faster than replacing 'data-' with ''.
var key = goog.string.toCamelCase(attribute.name.substr(5));
dataset[key] = attribute.value;
}
}
return dataset;
}
};
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