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107 lines
4.1 KiB
JavaScript
107 lines
4.1 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT Web is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT Web includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global define*/
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define(
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[],
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function () {
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"use strict";
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/**
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* Defines the `mct-before-unload` directive. The expression bound
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* to this attribute will be evaluated during page navigation events
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* and, if it returns a truthy value, will be used to populate a
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* prompt to the user to confirm this navigation.
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* @memberof platform/commonUI/edit
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* @constructor
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* @param $window the window
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*/
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function MCTBeforeUnload($window) {
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var unloads = [],
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oldBeforeUnload = $window.onbeforeunload;
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// Run all unload functions, returning the first returns truthily.
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function checkUnloads() {
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var result;
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unloads.forEach(function (unload) {
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result = result || unload();
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});
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return result;
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}
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// Link function for an mct-before-unload directive usage
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function link(scope, element, attrs) {
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// Invoke the
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function unload() {
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return scope.$eval(attrs.mctBeforeUnload);
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}
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// Stop using this unload expression
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function removeUnload() {
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unloads = unloads.filter(function (callback) {
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return callback !== unload;
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});
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if (unloads.length === 0) {
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$window.onbeforeunload = oldBeforeUnload;
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}
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}
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// Show a dialog before allowing a location change
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function checkLocationChange(event) {
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// Get an unload message (if any)
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var warning = unload();
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// Prompt the user if there's an unload message
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if (warning && !$window.confirm(warning)) {
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// ...and prevent the route change if it was confirmed
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event.preventDefault();
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}
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}
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// If this is the first active instance of this directive,
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// register as the window's beforeunload handler
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if (unloads.length === 0) {
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$window.onbeforeunload = checkUnloads;
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}
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// Include this instance of the directive's unload function
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unloads.push(unload);
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// Remove it when the scope is destroyed
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scope.$on("$destroy", removeUnload);
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// Also handle route changes
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scope.$on("$locationChangeStart", checkLocationChange);
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}
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return {
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// Applicable as an attribute
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restrict: "A",
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// Link with the provided function
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link: link
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};
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}
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return MCTBeforeUnload;
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}
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);
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