bookmarkInLocalStorage

gistfile1.js

(function () {
    "use strict";

    var localstorage;
    var bookmarks = [];

    function saveBookmarksToStorage() {
        localstorage["bookmarks"] = JSON.stringify(bookmarks);
    }

    function init() {
        localstorage = window.localStorage;
        if (localstorage["bookmarks"]) {
            try {
                bookmarks = JSON.parse(localstorage["bookmarks"]);
            }
            catch (err) {
                saveBookmarksToStorage();
            }
        }
    }

    function saveImageInLocalFolder(imageUrl) {
        if (imageUrl) {
            WinJS.xhr({
                responseType: "blob",
                url: imageUrl
            }).then(function (result) {
                writeBlobToFile(getImageName(imageUrl), result.response);
            });
        }
    }

    function writeBlobToFile(filename, blob) {
        var applicationData = Windows.Storage.ApplicationData.current;
        var localFolder = applicationData.localFolder;

        localFolder.createFolderAsync("bookmark", Windows.Storage.CreationCollisionOption.openIfExists).then(function (bookmarkFolder) {
            // Open the picker to create a file to save the blob 
            return bookmarkFolder.createFileAsync(filename, Windows.Storage.CreationCollisionOption.replaceExisting);
        }).then(function (file) {
            // Open the returned file in order to copy the data 
            file.openAsync(Windows.Storage.FileAccessMode.readWrite).then(function (output) {

                // Get the IInputStream stream from the blob object 
                var input = blob.msDetachStream();

                // Copy the stream from the blob to the File stream 
                Windows.Storage.Streams.RandomAccessStream.copyAsync(input, output).then(function () {
                    output.flushAsync().done(function () {
                        input.close();
                        output.close();
                    });
                });
            });
        });
    }

    function deleteImageInLocalFolder(imageUrl) {
        deleteFile(getImageName(imageUrl));
    }

    function deleteFile(filename) {
        var applicationData = Windows.Storage.ApplicationData.current;
        var localFolder = applicationData.localFolder;

        localFolder.createFolderAsync("bookmark", Windows.Storage.CreationCollisionOption.openIfExists).then(function (bookmarkFolder) {
            return bookmarkFolder.createFileAsync(filename, Windows.Storage.CreationCollisionOption.openIfExists);
        }).then(function (file) {
            file.deleteAsync();
        });
    }

    function getImageName(imageUrl) {
        var fileName = imageUrl.substring(imageUrl.lastIndexOf("/") + 1, imageUrl.length);
        return fileName;
    }

    function getImageLocalUrl(imageUrl) {
        return "ms-appdata:///local/bookmark/" + getImageName(imageUrl);
    }

    var instanceMembers = {
        addNews: function (news) {
            saveImageInLocalFolder(news.image);
            news.image = getImageLocalUrl(news.image);
            bookmarks.push(news);
            saveBookmarksToStorage();
        },
        hasNews: function (idArticulo) {
            var result = bookmarks.filter(function (item) {
                return (item.IdArticulo == idArticulo);
            });
            return (result.length > 0);
        },
        removeNews: function (idArticulo) {
            for (var i = 0; i < bookmarks.length; i++) {
                if (bookmarks[i].IdArticulo == idArticulo) {
                    deleteImageInLocalFolder(bookmarks[i].image)
                    bookmarks.splice(i, 1);
                    saveBookmarksToStorage();
                    return;
                }
            }
        },
        getAllNews: function () {
            return bookmarks;
        },
    };

    var staticMembers = {};

    var BookmarkInLocalStorage = WinJS.Class.define(init, instanceMembers, staticMembers);

    // add to namespace
    WinJS.Namespace.define("Repositories",
        {
            BookmarkInLocalStorage: BookmarkInLocalStorage
        }
    );
})();