upgrades.js

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elgg.provide('elgg.upgrades');

// The already displayed messages are saved here
elgg.upgrades.errorMessages = [];

elgg.upgrades.init = function () {
    $('#upgrade-run').click(elgg.upgrades.run);
};

elgg.upgrades.run = function(e) {
    e.preventDefault();

    // The total amount of items to be upgraded
    var total = $('#upgrade-total').text();

    // Initialize progressbar
    $('.elgg-progressbar').progressbar({
        value: 0,
        max: total
    });

    // Replace button with spinner when upgrade starts
    $('#upgrade-run').addClass('hidden');
    $('#upgrade-spinner').removeClass('hidden');

    // Start upgrade from offset 0
    elgg.upgrades.upgradeBatch(0);
};

elgg.upgrades.upgradeBatch = function(offset) {
    var options = {
        data: {
            offset: offset
        },
        dataType: 'json'
    };

    options.data = elgg.security.addToken(options.data);

    var upgradeCount = $('#upgrade-count');
    var action = $('#upgrade-run').attr('href');

    options.success = function(json) {
        // Append possible errors after the progressbar
        if (json.system_messages.error.length) {
            // Display only the errors that haven't already been shown
            $(json.system_messages.error).each(function(key, message) {
                if (jQuery.inArray(message, elgg.upgrades.errorMessages) === -1) {
                    var msg = '<li class="elgg-message elgg-state-error">' + message + '</li>';
                    $('#upgrade-messages').append(msg);

                    // Add this error to the displayed errors
                    elgg.upgrades.errorMessages.push(message);
                }
            });
        }

        // Increase success statistics
        var numSuccess = $('#upgrade-success-count');
        var successCount = parseInt(numSuccess.text()) + json.output.numSuccess;
        numSuccess.text(successCount);

        // Increase error statistics
        var numErrors = $('#upgrade-error-count');
        var errorCount = parseInt(numErrors.text()) + json.output.numErrors;
        numErrors.text(errorCount);

        // Increase total amount of processed items
        var numProcessed = successCount + errorCount;
        upgradeCount.text(numProcessed);

        // Increase the progress bar
        $('.elgg-progressbar').progressbar({ value: numProcessed });
        var total = $('#upgrade-total').text();

        var percent = 100;
        if (numProcessed < total) {
            percent = parseInt(numProcessed * 100 / total);

            elgg.upgrades.upgradeBatch(errorCount);
        } else {
            $('#upgrade-spinner').addClass('hidden');

            if (errorCount > 0) {
                // Upgrade finished with errors. Give instructions on how to proceed.
                elgg.register_error(elgg.echo('upgrade:finished_with_errors'));
            } else {
                // Upgrade is finished. Make one more call to mark it complete.
                elgg.action(action, {'upgrade_completed': 1});
                elgg.system_message(elgg.echo('upgrade:finished'));
            }
        }

        // Increase percentage
        $('#upgrade-counter').text(percent + '%');
    };

    // We use post() instead of action() so we can catch error messages
    // and display them manually underneath the upgrade view.
    return elgg.post(action, options);
};

elgg.register_hook_handler('init', 'system', elgg.upgrades.init);